Apparatus and method for a cellular freeway emergency telephone

Apparatus and method for a cellular freeway emergency telephone
United States Patent [191
Nasco, Jr.
Michael Nasco, Jr., Laguna Hills,
A self-contained cellular emergency roadside call box is
disclosed without the use of external telephone lines.
Cellular Communications
The call box is solar powered with battery storage and
comprises a controller coupled to a cellular transceiver.
. The controller is also coupled to a solar array and bat
[21] Appl. No.: 801,410
tery which is recharged through the controller. The call
box communicates through a radio-telephone link estab
Nov. 25, 1985
Int. Cl.4 .......................................... .. H04M 11/00
US. Cl. ...................................... .. 379/59; 455/33;
Field of Search ............. .. 379/56, 59, 60; 455/33,
455/313; 379/63
455/89, 100
Corporation, Houston, Tex.
[22] Filed:
Nov. 29, 1988
K. Bethel
[73] Assignee:
Attorney, Agent, or Firm-George F. Bethel; Patience
[75] Inventor:
Patent Number:
Date of Patent:
References Cited
Birilli et a1. ..
phone switching terminal. Each call box comprises a
plurality of status subcircuits for monitoring conditions
such as battery condition and transmitter status. The
call box communication and the status are processed by
a micro processor which generates appropriate com
mands required by the cellular transceiver. Information
3,844,840 lO/ 1974 Bender ................................ .. 136/89
4,176,254 Ill 1979 Tuttle et a1. ..
lished by the cellular transceiver to a cellular telecom
munication system. The cellular telecommunication
system includes a call site controller and mobile tele
179/5 R
..... .. 179/5 P
3/1986 Millsap et a1.
..... .. 340/539
l/ 1987 Winters ...... ..
370/ 1 10.1
2/ 1988 Farrell ................................. .. 379/59
can be transmitted bidirectionally between each of the
call boxes and the communication applications proces
sor. An interactive flow of information is exchanged
with the call box and the functional condition is moni
Primary Examiner-Robert Lev
10 Claims, 10 Drawing Sheets
US. Patent
Nov. 29, 1988
Sheet 2 of 10
US. Patent
Nov. 29, 1988
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Nov. 29, 1988
Sheet 5 of 10
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Nov. 29, 1988
Sheet 7 of 10
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Nov. 29, 1988
Sheet 8 0f 10
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Nov. 29, 1988
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1. Field of the Invention
The invention relates to the ?eld of cellular telephone
lar telecommunications subsystem with selected ones of
the plurality of emergency call boxes. By reason of this
combination of elements the plurality of emergency call
boxes can be installed and maintained at low cost and
are capable of arbitrarily programmable interactive
The system further comprises interof?ce local tele
equipment and in particular to solar powered telephone
phone exchanges coupled to the communication appli
call boxes using a cellular telephone system to radiotele
phonically communicate from a plurality of ?xed road
side sites.
2. Description of the Prior Art
Emergency roadside call boxes have become increas
cations processor wherein communication between the
plurality of emergency call boxes can be selectively
ingly important and productive elements in providing
roadside security and emergency assistance in the met
ropolitan areas in the United States and throughout the
world. Originally, such roadside emergency call boxes
were hardwired to conventional telephone land lines.
coupled to the local telephone exchanges under control
of the communication applications processor.
The controller comprises a plurality of status subcir
cuits. Each status subcircuit monitors a predetermined
status parameter of the corresponding call box.
The system further comprises a circuit for selectively
communicating the predetermined parameters as moni
tored by the plurality of status subcircuits to the com
However, the installation of such telephone land lines
munication applications processor. The parameters
substantially escalates the installation and maintenance 20 monitored by the status subcircuits include battery
costs of such emergency roadside telephone boxes. In
power level, and the physical condition of the corre
order to overcome this limitation, the prior art devised
sponding call box indicative in part of whether call box
emergency telephone call boxes which use a radio
has been struck.
transmission link for communications. Cannalty et al.,
“Emergency Communications System”, US. Pat. No. 25 The controller further comprises a circuit for receiv
ing and processing information from the communica
3,939,417; and Wisniewski, “Emergency Calling Sys
applications processor to initiate operations in the
tem”, US. Pat. No. 3,492,581 show such systems.
Power for these call boxes is provided by a recharge
The controller still further comprises a circuit for
able battery included within their housings. However,
such prior art battery operated systems either required 30 adjusting the volume of transmitted and received audio
the units to be coupled to a source of electrical power
The controller has a timing mechanization included
for trickle-charging or required the periodic replace
within its digital circuitry. The timer provides the capa
ment or recharging of the battery packs through mobile
roadside service. Again, although savings were realized
bility to measure predetermined elapsed time periods.
in installation costs by using battery powered units, the 35 The timer mechanism is used in the following ways:
maintenance or service costs of such systems often pro
(1) To limit each call to a maximum duration (e. g. 10
hibited their use.
Furthermore, in the past radiotelephone communica-:
tions within geographic areas were realized using a
process based on a single transmitter and antenna. This
method of communication limits the number of calls
that can be placed in a geographic area and limits the
size of the area that can be covered with a given amount
(2) To terminate a call if there is no conversation for
a predetermined period of time (e.g. one minute); and
(3) To cause each call box to automatically initiate a
call and to report its operational status on a periodic
basis (e.g. once every 24 hours).
In the event that the telephone handset is left off the
of equipment. However, with the recent advent of cel
hook, the automatic time out will terminate the call and
lular telephone technology, these limitations, which 45 will thus save battery power. Should this occur, the call
were characteristic of the prior art single transmitter
box is automatically reactivated and another emergency
systems, no longer exist.
call is placed should the hook switch be operated to the
Therefore, what is needed is a design and method of
on-hook status followed by an off-hook status.
using a radio linked emergency call box which is adapt—
able to cellular telephone technology and which is char 50 Stated in yet another way the invention is an emer
gency roadside call box comprising: a controller; a cel
acterized by low installation andservice costs.
lular transceiver coupled to and controlled by the con
troller; a battery for powering the controller coupled to
controller and transceiver; and a solar array coupled
The invention is a system for providing an emergency
call box service comprising a plurality of emergency 55 to the controller for recharging the battery. By reason
of this combination of elements an emergency roadside
call boxes, wherein each call box further comprises: a
call box can be installed and maintained at low cost.
controller; a cellular transceiver coupled to the control~
The controller comprises a plurality of status subcir
let; a battery coupled to the controller for providing
power to the controller and transceiver; and a solar
cuits for monitoring corresponding selective parameters
array for generating power coupled to the controller 60 of the controller, and a circuit for interrogating the
plurality of status subcircuits for operationally respond
for recharging the battery. Also included in the system
ing to the parameters as monitored by the status subcir
is a cellular telecommunications subsystem in radio
telecommunication with each of the plurality of emer
The plurality of the subcircuits comprise at least a
gency call boxes. A communication applications pro
cessor is coupled to the cellular telecommunications 65 subcircuit for monitoring a user request for emergency
subsystem for processing data received in part from the
plurality of emergency call boxes. The communications
applications processor communicates through the cellu
transmission, battery condition, presence of a communi
cation transmitted to and from the call box, physical
integrity of the call box.
FIG. 8 is a schematic diagram of a programmable
The call box further comprises a circuit for selec
tively communicating the corresponding plurality of
microprocessor incorporated in the controller.
parameters of the call box to an off-site recipient.
The call box still further comprises a circuit for re
FIG. 9 a schematic diagram of decoder circuit used
to communicate between the microprocessors on the
FIG. 10 is a schematic diagram of a circuit for cou
ceiving information generated off-site and a circuit for
initiating an operation of the call box in response to the
received off-site information.
pling signals between the transceiver and one of the
The controller comprises a circuit for conserving
power from the battery when an emergency communi
microprocessors on the controller.
FIG. 11 is a schematic diagram of an audio level
cation is not desired, and a circuit ‘for adjusting audio
gain for audio information transmitted and received by
the call box.
adjust circuit which can be controlled by a remote
central processor.
FIG. 12 is a flow diagram illustrating the operation of
the controller.
The invention and its various embodiments may be
better understood by now turning to the following de
The invention can still further be characterized as a
method in an emergency roadside call box, where the
call box is battery powered and coupled through a ra
dio-telecommunication link to a cellular telecommuni
cation system and communication applications proces
sor. The method comprises the steps of reading a plural
ity of call box status parameters. Next follows the step
the detailed circuitry in the cellu
of selectively performing a remedial routine in response
lar call box and its method of operation, first generally
to the step of reading the plurality of status parameters
consider the environment in which the call box is used
dependent upon the condition of each corresponding
and how it is utilized during normal operation.
parameter. Thereafter follows the step of selectively
Turn now to FIG. 1. When an emergency occurs
entering an emergency call routine wherein a cellular
telecommunication transceiver within the call box is
powered up and bidirectional voice communication is
along a roadside, the affected user will locate the near
est emergency call box, generally denoted by reference
numeral 10. The user will lift the handset which will
cause call box 10 to automatically dial a prepro
established through the cellular telecommunication
system to the communication applications processor.
By virtue of this method, remotely powered emergency
grammed number to the freeway emergency telephone
system control center. The call is transmitted via a radio
call boxes in radio-telecommunication with the commu
link to a local cell site transceiver 12 over a selected one
nication applications processor are operationally main
of 21 channels according to which channel is the stron
gest cellular channel available. This selection of com
munication channels by transceiver 12 and mobile tele~
The invention can still further be characterized as an
apparatus in combination with a cellular radiotelephone
for generating information compatible with the cellular
radiotelephone in a solar powered emergency call box.
phone switching of?ce 14 is well known in the art of
cellular communications and will not be further de
scribed. Local cell site transceiver 12 is connected with
The invention comprises a ?rst circuit for determining a
plurality of status conditions relating to the emergency
call box; a second circuit for controlling power usage of
a mobile telephone switching of?ce 14 by wireline
trunks. Mobile telephone switching of?ce 14, which is
an automatic terminal, then provides call box identity
the emergency call box to minimize power usage; and a
con?rmation and predialed access to the control center,
which includes a communications applications proces
sor generally denoted by reference numeral 16. Mobile
third circuit for processing the status conditions deter
mined by the ?rst circuit and responsive to at least the
status conditions controlling the second circuit. The
third circuit also selectively bidirectionally generates
and receives cellular radiotelephone compatible signals
telephone switching of?ce 14 can also connect call box
10 to a conventional telephone switching exchange 15
in response to commands from the control center so that
under programmable control. The third circuit is cou
pled to the ?rst and second circuit and to the cellular
three party telephone conference calls can be provided
telephone station.
The invention is best understood in the context of an
illustrative example as shown in the following drawings
wherein like elements are referenced by like numerals.
or the call from call box 10 simply handed off to another
The incoming calls will be uniquely identi?ed with a
speci?c emergency call box. The identi?cation will then
be used to access a data base and all information corre
sponding to that call box will be retrieved in the appli
cations processor 16. An automatic call distributor 18
FIG. 1 is a block diagram of a system in which the 55 will connect the incoming call to an available operator
call box incorporating the invention is included.
at a communications applications processor (CAP) sort
FIG. 2 is a front elevational depiction of the call box
center 20. A human operator answers the call and the
as installed at a roadside site.
communication which to this point has been digital will
FIG. 3 is a side elevational view of the call box of
be followed by voice communication. Speci?c call box
FIG. 1.
information will be displayed on the screen in response
FIG. 4 is a block diagram of including the controller
to an automatic call distributor processor 22 coupled
in the call box and its associated system elements.
with a master processor 24 which causes speci?c infor
FIG. 5 is a schematic diagram of status subcircuits
mation to be brought up from the data base to the ap
included in the controller.
propriate support station 20. Such information includes
FIG. 6 is a schematic diagram of another status sub= 65 the location of the call box, nearest access roads, local
terrain and appropriate local emergency numbers. Sup
FIG. 7 is a schematic diagram of a circuit to read the
port station 20 and master processor 24 interactively
status data.
communicate so that all subsequent actions which are
undertaken by the operator can be logged for archival,
injection signal is generated by a receiver synthesizer
management and planning use. Archival discs 26 are
and mixes with the receive signal to provide a ?rst IF
coupled to and controlled by master processor 24 for
signal. The IF signal is then coupled to an IF board.
The IF signal (45 Mhz) is coupled to a buffer ampli?er
whose output is coupled to a 2-pole crystal ?lter which
mass data storage.
Turn now speci?cally to call box 10 as shown in FIG.
2 in front elevational view and in FIG. 3 in side eleva
tional view. Call box 10 is a completely self-contained
unit requiring no connection with external power lines
or telephone cables. Box 10 is solar powered, is de
signed for use with a cellular telephone system, and is
characterized by low-cost installation with quick repair
or replacement.
As shown in FIGS. 2 and 3, call box 10 comprises a
housing 28 mounted on a road standard 30. Housing 28
includes the call box controller, radio transceiver and
battery described and shown diagrammatically in the
following Figures. The three watt radio transceiver is
coupled to a conventional collinear antenna 32 with 3
passes the signal on to a second buffer ampli?er. The
output of this buffer ampli?er is coupled to a second
2-pole ?lter. The output of the second 2-pole ?lter is
coupled to a circuit which includes a second mixer, an
IF ampli?er, a receiver signal strength indicator, and a
FM detector. A second conversion and detection is
executed in this circuit and its output is an audio signal
which is coupled to an audio/logic board. On the audi
o/logic board the audio receive signal is conditioned in
a conventional manner.
An audio signal from the handset is coupled to the
radio via a transmit audio hybrid on the audio/logic
board. This hybrid comprises a buffer and a 300 Hz to 3
dB of isotropic gain mounted on the top of standard 30.
kHz bandpass ?lter. The output from the bandpass ?lter
Also mounted with antenna 32 is a solar panel 34. Solar 20 of the transmit audio hybrid is fed to a 2:1 compressor
_ panel 34 as described below is coupled to circuitry
comprised of by one half of a single IC compander
within main housing 28 and is.used to recharge the
located on the audio/logic board. The compander dy
batter included within the housing. In particular, solar
array 34 is made of thirty-four matched silicon solar
namically condenses the audio signal, which is ex
panded 1:2 by the cell site controller to the original
cells with peak power rated at 10.5 watts. The panel is 25 dynamic range. The output of the compressor is fed
glass laminated and held in a metal frame to protect it
back into the transmit audio hybrid, which contains
from dirt, moisture and impact. Approximately 2.2 watt
circuitry for preemphasis, limiting, ?ltering, audio mut
hours per day is generated on the average by the solar
ing, and a summing ampli?er to combine the transmit
panel 34, which is equivalent to the amount of power
audio signal with data, supervisory audio tones and
for 45 minutes of constant air time, generally estimated
other control signals before outputting the signal to the
to be equal four to ?ve average roadside emergency
synthesizer digital board. The transmit audio signal is
calls. Standard 30 is coupled to a ground anchor 36 to
coupled to the modulation input of a sidestep VCO on
embed it into the site. Ground anchor 36 and standard
the syntheziser board. The output of the VCO, a modu
30 are coupled together by brake plate 38 seen in FIG.
lated 30 MHz signal, is coupled to a buffer whose out
2 so that, if a vehicle collides with standard 30, brake 35 put is coupled to one input of a sidestep mixer. The
plate 38 will bend, retain standard 30 to the ground
injection input on the mixer is provided with a signal
anchor 36, and allow standard 30 to be folded over
which is an output frequency doubled from the receive
instead of being snapped over the hood and thrust
VCO. The output of the mixer is a modulated RF sig
through the windshield of the oncoming vehicle. Stan
nal. The RF signal is then coupled through a 3-pole
dard 30 is generally U-shaped so that the coupling an 40 ?lter, and ampli?er before being coupled to a RF power
tenna and power lines between housing 28 and solar
array 34 antenna 32 are laid in the U-shaped channel of
The frequency synthesizer comprises a receiver
standard 30 and can be covered or weather sealed by
VCO, a synthesizer digital board, and an exciter board.
protective plate 35. The entire unit therefore comprises
The operating frequencies in the radio are all derived
a sealed and weatherproof assembly.
from the receiver VCO phase—locked loop. This is com
The three watt cellular transceiver enclosed within
prised of a dual modulus prescaler, a programmable
main housing 28 is a conventional Motorola cellular
PLL IC, a charge pump, loop ?lter, and receiver VCO
transceiver sold under the trademark, DYNA-TAK
hybrid. This loop is controlled by a channel select line
2000. The details of operation of the transceiver are
from the logic circuitry which serially loads the channel
only implicitly included in this description and will not 50 select data into the programmable PLL IC. One output
be expressly discussed except to the extent necessary for
of the receiver VCO goes through a frequency tripler
a fully illustrated description. Further details of the
and is fed to the injector doubler hybrid used in the ?rst
transceiver of the illustrated embodiment can be found
mixer of the RF receive circuitry. The other output
in the published user’s manual, entitled DYNA T.A.C,
from the receive VCO is coupled to a frequency dou
Cellular Mobile Telephone, 800 MHz Transceiver, 55 bler on the exciter boar and serves as the input signal to
available from Motorola Technical Writing Services at
the sidestep mixer.
1301 E. Algonquin Rd., Schaumburg, Ill. 60196 which
Further details and schematics of all the above cir
is expressly incorporated herein by reference.
cuitry can be found in the Motorola User’s manual
Although details of the transceiver are incidental to
referenced above.
the invention, a general description is provided here for 60 The transceiver signals which are referenced most
completeness of explanation. First consider the receive
often in the disclosure of the illustrated embodiment are
circuitry of the transceiver. In the transceiver discussed
the handset signals. The handset includes a cradle mi
in the illustrated embodiment, radio signals in a prede
croprocessor which provides an interface between the
termined range are selected by a 6-pole bandpass ?lter.
microprocessor of the handset and the microprocessor
The modulated receive signal is then passed to a pream 65 of the transceiver logic unit. Digital communication is
pli?er. A 3-pole ?lter, which further bandpass ?lters the
receive signal, is coupled to the output of the preampli
DATA and R DATA. Data carried by the bus conven~
?er . A ?rst mixer is coupled to the 3-pole ?lter. An
tion include keypad and ?uorescent display information
effectuated through the digital signals C DATA, T
for the handset, display information for the cradle con
(10) providing necessary logic and interface for op
trol/indicator board, and other various control signals
tional controller functions and future enhancements
and commands between the control unit and transceiver
such as slow scan video or specialized data links.
logic unit. Only the more relevant of these signals will
Controller 42 is built around a microprocessor 118
described in connection with FIG. 8. A number of sig
nals indicative of the status of call box 10 are coupled to
be discussed below. Logic gates are provided in con
junction with the bus signals to gate either timing infor
mation or data depending on the state of a control line
INT SELECT. The handset processor uses this cir
cuitry to determine if the information on the T DATA
line is actual data or merely a timing pulse. C DATA
and T DATA, or C DATA and R DATA (the choice
depending on the direction of information ?ow) will be
logical complements during data transmission. When
they are not so related, they will signify timing informa
a data bus 116 as described in FIG. 7 to which micro
processor 118 is coupled and are generated by a plural
ity of status circuits described in FIGS. 5 and 6. Micro
processor 118 generates a number of discrete control
signals through a decoder 130 (FIG. 8) for the control
of these status circuits and control signals which are
utilized in a decoder tree in FIG. 9 to provide key pad
and other cellular control signals to cellular telephone
tion, i.e. the reset or idle states. Communications with 15 transceiver 44.
Input and output to cellular telephone transceiver 44
these signals is on a three wire bidirectional bus. Data is
is completely effectuated by the keypad signals shown
communicated in an address-then-data serial word for
coupled to the input/output bus in FIG. 9 and by the
mat. At the beginning of communication the bus direc
digital signals, C DATA, T DATA, and R DATA
tion is established. During message transmission each 20 described
below in connection with microprocessors
data state is followed by an idle state with a reset state
118 and 166. Cellular telephone transceiver 44 commu
entered after the last data bit of the message. Further
nicates with microprocessor 118 through a second or
details of the bus protocol are described in the Motorola
interfacing microprocessor 166 described in FIG. 10.
User’s manual referenced above.
Both microprocessors 118 and 166 control the transmit
Keypad data is communicated from the handset via 25 and receive audio level control circuitry shown in FIG.
column and row signals which are then used with an
11. The overall operation of microprocessor 118 is sum
internal look-up table to identify the keypad button
marized by the flow chart of FIG. 12.
which was pushed.
Turn now to FIG. 5 wherein the operation of these
Handset 40 is diagrammatically depicted in FIG. 2.
functions can be provided by the circuitry illustrated.
No further detailed discussion of the transceiver will be 30 FIGS. 5~7 are schematics of several circuits which are
undertaken except to such extent as such details affect
controllably used to sense a number of status conditions
the operation of the cellular call box controller also
included in housing 28. The controller is a single board
circuit which can be easily removed from a modular pin
of call box 10. For example, the charged condition of
battery 46, the physical integrity of call box 10, the
presence of information on the communication channel,
connector and a new board inserted for easy ?eld ser 35 the status of handset 40, and the condition of the trans
vice. The controller comprises the logic and circuitry
mitter are all monitored and selectively reported by
necessary to control the entire operation of call box 10.
Turning to FIG. 4, a diagrammatic depiction of the
elements within call box 10 is shown. Cellular call box
means of the circuitry which will now be described in
connection with the following Figures.
Consider ?rst the battery condition circuit depicted
in FIG. 5. Battery 46 is coupled to node 50. A conven
controller 42 serves as the central unit to which solar
tional voltage regulator, generally denoted by reference
array 34, battery 46 and any additional call box switches
numeral 52 converts the 13 volts DC. to 5 volts for use
or input/output functions 48 are coupled. Similarly,
throughout the logic circuitry as indicated. The battery
cellular transceiver 44 is coupled to controller 42 and
voltage at node 50 is monitored by a conventional zener
antenna 32 in turn is coupled to cellular transceiver 44.
Before describing the circuitry of controller 42, con 45 diode 54. If the voltage is sufficient, transistor 56, whose
input is coupled to the anode of diode 54, will be biased
sider ?rst the functions which controller 42 performs.
on and its output coupled through two inverters, collec
Included among, but not limited to these functions are:
tively denoted by reference numeral 58, to the set input
(l) controlling operation sequences for user friendly
terminal, SD, of a clocked latch 60. The output, Q, of
(2) automatically powering 'the transceiver when 50 latch 60 is provided with the signal, inverted LO BAT
(low battery), which is utilized in subsequent circuitry
handset 40 is lifted;
(3) automatically dialing the preprogrammed number
or alternatively any one of a plurality of numbers corre
as described below. Whenever LO BAT is true, a pre
determined low battery voltage or state of battery dis
charged is indicated. The clock input, CP, of latch 60 is
sponding to one of a corresponding plurality of acti 55
provided with a signal, SET LO BAT (set low battery).
vated switches or buttons (not shown in the Figures);
Latch 60 is cleared by a signal, CL LO BAT (clear low
(4) automatically powering down after a preset, pre
programmed time period or after hang-up of handset 40;
battery), coupled to the clear terminal, CD, of latch 60.
(5) controlling and adjusting necessary voltage level
changes in audio and logic circuits;
(6) controlling and regulating all timing functions to
integrate the various portions of the assembly;
(7) controlling and regulating the recharging rates
from solar array 34;
the physical condition of call box 10, namely whether
Consider now the circuitry in FIG. 5 which monitors
standard 30 is down on the ground. A mercury tilt
switch 62 is coupled between the five volt supply and
ground and is normally closed. However, should the
pole be struck, or otherwise tilted, switch 62 will open
as shown in FIG. 5. When switch 62 opens, a high or
(8) controlling all power for the entire assembly de 65 true signal will be coupled to the set terminal, SD, of
picted in FIG. 4 in a manner designed for the most
clocked latch 64 whose output, Q, is the signal, DWN
efficient conservation and use of power;
(down), representing that the pole is down. The clock
(9) interfacing to transceiver 44; and
input, CP, is the signal, SET DWN (set down), and
latch 64 is cleared at its clear terminal, CD, by the signal
CL DWN (clear down).
Turn now to the circuitry in FIG. 5 used to monitor
the status of the rf transmitter. When transceiver 44 is
turned on, 9 volts are applied to node 72. This in turns
on transistor 74 whose output is coupled through in
verter 76 to provide the signal, inverted TRANS PWR
(transmitter power), indicative that the transmitter is
powered up. Again, TRANS PWR is used in circuitry
tion with FIG. 8. The remaining portions of the cir
cuitry of FIG. 7 will be described below.
Turning to FIG. 8, the encoded word in data bus 116,
which is diagrammatically shown throughout the cir
cuitry as appropriate, is coupled to inputs B0-B7 of
microprocessor 118, which is the operational pro
grammed microprocessor of controller 42. Micro
processor 118 in the illustrated embodiment is a Motor
ola 6805 CMOS device which is characterized by very
to be described below as a status signal indicative of the
low power consumption. Microprocessor 118 is
operation of call box 10.
clocked by a conventional external crystal controlled
Consider now the circuitry in FIG. 5 used to selec
tively power up the rf transmitter, which as a primary
clocking circuit, generally denoted by reference nu
meral 119. The program for microprocessor 118 is
power user, is normally off. A signal, RLY ON (relay
on), generated by means described below, is applied to
a Darlington pair, generally denoted by reference nu
meral 94, to selectively energize a relay 96. When relay
96 is energized in response to RLY ON, the 13 volts of
stored within an external EPROM memory 120. Mem
power at node 50 is coupled through contacts 98 to a
ory 120 is accessed by microprocessor 118 through
terminals B0-B7 and A8-A12, which provide a thir
teen-bit access word. Terminals B0-B7 are used during
the ?rst half cycle of processor 118 as the lower eight
bits of the address and during the second half cycle as a
plurality of power terminals IGN SENSE, BAT PLUS,
data input-output. Therefore, during the memory fetch,
the lower eight bits of the address are coupled through
where in the circuitry as an operative means of power
data bus 116 to a bit latch 122 under the control of the
ing up transceiver 44. These power voltages are particu
address strobe signal from terminal AS of processor
118. Thereafter, all thirteen bits of the address are cou
lar to the Motorola transceiver assumed in the illus
trated embodiment and are thus not further discussed 25 pled to address bus 124. The address inputs A0-A10 of
memory 120 are thus coupled to address bus 124 and
Turning your attention to the circuitry of FIG. 6
consider now the status of the operation of handset 40.
The audio portion of the signal from handset 40 is cou
memory 120 enabled by address bits A11 and A12
pled through capacitor 78 to a peak-to-peak detector,
generally denoted by reference numeral 80. The output
of peak-to-peak detector 80 is coupled through a buffer,
generally denoted by reference numeral 82, to the set
input, SD, of clocked latch 86. The output, Q, of latch
86 is the signal, BSY (busy), which indicates that infor
30 a read or write cycle according to software control
mation, conversation, or at least an audio signal of some
sort is being provided to handset 40. The clock input,
CP, of latch 86 is the signal SET BSY (set busy) and
latch 86 is cleared at its clear terminaLCD, by the signal,
EPROM memory 120. The program is stored in two
kilobytes of memory. Thus A12 and All are provided
as the inputs to NAND gate 126 whose output is cou
pled to the inverted chip enable terminal, CE. Thus the
CL BSY (clear busy).
two highest address bits serve as an address enable. The
through NAND gate 126 and strobed by the output of
NAND gate 128. Memory 120 is selectively strobed in
through the read/write terminal, inverted R/W, and
data strobe terminal D5 of microprocessor 118 which
are provided as the inputs to NAND gate 128.
Upon power up and reset the internal address register
of microprocessor 118 is set at the highest address of 2K
The means for originating various status signals now
control and timing of microprocessor 118 with respect
having been described, the primary status signal,
to memory 120 is conventional and will not be further
detailed beyond that just outlined. At any rate, memory
namely the lifting of the handset off its hook switch, can
120 is appropriately strobed and stored information is
be considered. Conventional telephone hook switch 100
in FIG. 5 senses the lifting of handset 40. One terminal 45 then read from outputs Q0-Q7 onto data bus 116. The
of the switch 100 is coupled to ground and the remain
signals data strobe, DS, and the read/write signal,
R/W, from microprocessor 118 are similarly coupled to
ing terminal is coupled to a debounce NAND gate
the inputs of NAND gate 128, whose output then serves
latch, generally denoted by reference numeral 102. The
as an output enable signal coupled to the inverted out
output of latch 102 is the status signal, OFF LAT (off
latch), which is also used as a clocking signal for 50 put enable terminal of EPROM memory 120. Thus, data
from memory 120, as well as encoder 114, is appropri
clocked latch 106. The input, D, of latch 106 is coupled
to the 5-volt power supply so that upon receipt of a
clock pulse, OFF LAT, output Q of latch 106, the sig
nal, OFF HK (off hook), goes high. Latch 106 is cleared
ately made available to microprocessor 118 over data
bus 116.
Outputs PAO-PA7 and PBO-PB7 are input/output
at its clear terminal, CD, by a signal, CL OFF HK 55 ports of microprocessor 118 which in the present em
bodiment are used only as output terminals which are
(clear off hook). Thus once the handset has been taken
selectively accessed through a program control. Con
off hook, the circuitry will be able to remember that this
sider now the various outputs provided at these termi
has occurred even if placed back on hook until latch 106
nals. PA5-PA7 and PB5—PB7 are coupled to the inputs
is cleared by program control through CL OFF HK.
This allows the program to recognize that a call was 60 of decoder 130. The signals at the outputs of PA5—PA7
correspond respectively to two encoded bits designated
attempted and to enter a call ready status for a predeter
as AOA and AIA and an inverted enable signal, EA.
mined time regardless of the actual hook condition.
Turn now to FIG. 7. The various status signals de
Similarly, signals PB5—PB7 include respectively two
encoded bits AOB and AIB together with an inverted
scribed in connection with FIGS. 5 and 6, OFF I-IK,
DWN, LO BAT, BSY, TRANS PWR, and OFF LAT 65 enable signal EB. These data bits and their respective
are each provided as inputs to an encoder 114. The
enable signals are thus coded according to conventional
output of encoder 114 is coupled to a data bus 116 as a
parallel 8-bit word described in more detail in connec
means into a plurality of control signals as illustrated in
FIG. 6. For example, the signals CL OFF HK, SET
Turn now to FIG. 9 wherein signals, A0-A4, gener
ated on control bus 132 by microprocessor 118 are con
verted into row and column key pad signals which can
be understood by transceiver 44. The signal A4 on con
and CL LO BAT which were described in connection
with various status latches of FIG. 4 are generated by
microprocessor 118 in combination with decoder 130.
The various latches are thus clocked and cleared at the 5 trol bus 132 corresponding to the output from terminal
appropriate times under software control as the status of
PA4 of microprocessor 118 is an enable signal used to
call box 10 queried.
enable decoder 154. Decoder 154 is driven by the con
Outputs PAO-PA4 of microprocessor 118 are cou
trol signals A2 and A3 corresponding respectively to
pled to a control bus 132 to respectively generate con
terminals PA2-3 of microprocessor 118. The output of
trol signals All-A4 whose use will be better described in
decoder 154 are intermediate inverted decoding signals
connection with FIG. 10 in relation to the manipulation
EA and EB. These signals are output in parallel to a
of transceiver 44.
second stage of two decoders 156 which have as addi
The output of PB1 of microprocessor 118, which is
active low, is coupled to an inverter 134 whose output
136 is a signal, RLY ON, used to power Darlington pair
tional inputs, control bus signals A0 and A1 correspond
ing respectively to terminals PAO-1 of microprocessor
94 in FIG. 5 in order to power up transceiver 44.
converted into twelve key pad signals corresponding ‘to
the twelve buttons on a_ telephone key pad correspond
ing to digits 0-9,‘ and #, and two additional related
radiotelephone signals ON/OFF and volume control,
VOL CONT. Thus, bits A0-A3 represent sixteen possi
118. Ultimately the ?ve control bits A0-A4 will be
PA7, PB7, and PB1 are each pulled high through a
resistor in the case where the lines ?oat so that decoder
130 and the transceiver power up relay are affirmatively
maintained disabled unless clearly pulled active low by
an appropriate output on each of these lines.
The outputs of PBO-PB3 of microprocessor 118 are
the signals, return data transmit, R DATA T; receive
data receive, R DATA R; true data receive, T DATA
ble combinations with a four-bit word which is decod
ed in two stages in decoders 154 and 156 and coupled
as sixteen discrete output signals to the inputs of analog
R and inverted interrupt control, INT-CONT, which 25 switches 158-164. The A4 bit either disables all sixteen
outputs or enables the one of sixteen outputs as desig
are speci?c input and output control signals used to
by the A0-A3 bits. Consider for example analog
provide necessary control functions for transceiver 44.
164. The four inputs to analog switch 164
Coupling directly to the input/output ports PBO-PB3
correspond to the key pad numerals 0-3. With respect
of microprocessor 118 gives the microprocessor the
to each of these numerals, two signals will need to be
ability to directly respond to and to manipulate a trans
generated in order to command transceiver 44, namely
ceiver if desired. However, in the present embodiment,
row and column designations corresponding to key
these control ports are not speci?cally used for the
pad numbers 0-3. In particular, numeral 0 is located in
Motorola transceiver illustrated.
the second column and fourth row. Therefore, the ?rst
Returning to FIG. 7, output PB1 of microprocessor
166, to be described below, is also coupled to an input 35 two outputs of analog switch 164 correspond to col
umn 2, row 4 and will be activated in response to
/output bus 138. PB1 is coupled from input/output bus
activation of one of the inputs to analog switch 164,
138 to an inverter, generally denoted by reference nu
such as E0. The pairs of outputs corresponding to
meral 140. The inverted PB1 signal is applied to node
numerals l, 2 and 3 are similarly activated. In the same
142 as the signal, SVC (service), indicating that the
transceiver has established radiotelephone contact with 40 manner the outputs of analog switch 162 correspond to
the row and column pairs corresponding to key pad
a ground station. The signal, SVC, is then coupled to
numerals 4-7. Analog switch 164 similarly includes as
one of the inputs of encoder 114 and used as a condi
its outputs key pad numerals 8 and 9, * and #. The
tional signal to generate the eight bit status words cou
outputs of analog switch 158 are peculiar to radiotele
pled from encoder 114 to data bus 116.
The output PB7 of microprocessor 166, to be de 45 phones, which comprise a fifth row. The ?fth row on a
radio telephone corresponds in the second column to
scribed below, is similarly coupled to input/output bus
the signal END and in third column to the signal SND.
138 to an inverter generally denoted by reference nu
Included as discrete signals are the control signals
meral 152. Output 154 from inverter 152 is the inverted
volume, VOL, and power, PWR, which are also refer
signal, IN USE, which is used to signify that a call has
enced in FIG. 9 as the input/output signals on bus 138
been placed or is in process. Thus IN USE similarly can
as VOL CONT and ON/OFF, respectively. Each of
be used as a conditional signal in decoder 114 to prevent
inappropriate transmission of a status word to data bus
Encoder 114 is also coupled to the two highest ad
dress bits A11 and A12 from address bus 124 through a
series of logic gates, generally denoted by reference
the row and column signals from switches 158-164 are
active low and are appropriately buffered and coupled
through diodes and resistors according to conventional
principles as illustrated in FIG. 9 to I/O bus 138. By this
means microprocessor 118 can arbitrarily manipulate
and control radiotelephone transceiver 44.
Turning how to FIG. 10, a microprocessor 166, run
numeral 144. More particularly, A12 is inverted by
inverter 146 and coupled together with address signal
A11 to the inputs of NAND gate 148. The output of
by crystal controlled clock 168, allows signals received
NAND gate 148 is logically combined in OR gate 150 60 by transceiver 44 to place signals of the input/output
with the output of NAND gate 128, the inverted signal
bus 138. Microprocessor 166 interfaces the circuitry and
DS/R. The output of OR gate 150 in turn is coupled to
buses described above with the unique signals used by
the inverted output enable terminal, OE, of encoder
transceiver 44 and to that extent is transceiver depen
114. Therefore, the output word from encoder 114 is
dent. The signals, return data, R DATA; complemen
coupled to data bus 116 according to the logic provided 65 tary data, C DATA; and true data, T DATA are signals
by gates 144. This logic prevents the placement of a
speci?c to the Motorola transceiver 44 and are digital
status word on data bus 116 at the same time that the
program is being read from memory 120.
signals which are transmitted between transceiver 44
and the controller.
Each of these signals is coupled through appropriate
logic circuits to input ports of the microprocessor 166.
For example, T DATA, an input signal to microproces
will request service again when the bus returns to the
idle state.
Consider now the remaining output terminals of mi
croprocessor 166. The outputs PCO-PC2 correspond to
columns 3 through column 1 of the key pad respec
tively; outputs PAO-PA4 corresponding to rows l-5 of
sor 166, is coupled through an exclusive OR gate 170
acting as a buffer since one input is held low. The output
of gate 170, which is T DATA, is also coupled to input
port PB4 of microprocessor 166. C DATA and buffered
T DATA output from gate 170 are provided as the
inputs to exclusive OR gate 172. The output of gate 172
the key pad respectively; and signals FBI or SVC (ser
vice), and PB7 or IN USE described above can be selec
tively generated coupled to input/output bus 138. PA7
is thus true whenever T DATA or C DATA are true
is a GAIN ADJ signal described below in connection
with FIG. 11 used to adjust audio signal strengths in the
voice channel. PC3 is coupled to a push button switch
but if in an idle state they both go true, the output is
false. Thus, the output of gate 172 is true whenever data
is being transmitted on the three wire bus and is false
when the bus is in the idle state or reset state. The out
put of gate 172 is provided as an input in turn to exclu
sive OR gate 174 whose other input is coupled to an
which can be manually operated by the call box user to
step up the audio strength of the received voice commu
Turn now to FIG. 11 wherein the circuitry illustra
interrupt port PBS of microprocessor 166. The output
of gate 174 is coupled to the inverted interrupted termi
nal, INT, of microprocessor 166. This terminal will be
active whenever data is being received from the trans 20
ceiver. PBS port acts as an internal acknowledgement
tive of audio processing is illustrated. The microphone
input of hand set 40 is coupled across terminals 180. The
audio signal for the caller is thereby coupled through
coupling capacitor 182 to an audio ampli?er, generally
referenced by numeral 184. The output of audio ampli
?er 184 is coupled through coupling capacitor 186 and
signal. The output of gate 172 will be low when the data
link is idle and will be high when it is busy. Therefore
provided as an output at node 188 as the transmitted
when PBS is high, the inverted interrupt, INT, will go
audio, TX AUDIO.
active low when data comes in. This will cause an inter 25
rupt to be executed in microprocessor 166 to enable it to
receive data.
ON/OFF is a toggle signal on I/O bus 138 as de
scribed in FIG. 7 and is similarly coupled through limit
ing resistor 190 to node 188 to override the transmitted
audio signal according to microprocessor 166 to cause
of transistor 178. Transistor 178 is in turn driven by
the transceiver to be turned on or off. Thus, grounding
output PBO, which is the data output from microproces 30 the on/off line at I/0 bus 138 causes the transceiver
sor 166 to transceiver 44. An input of exclusive OR gate
power to be turned on if it is off or to be turned off if it
176 is also coupled to the output of transistor 178 and
is on.
gate 176 acts as a buffer. Therefore, the output of buffer
Similarly, audio volume control or a gain adjust sig
Finally, R DATA is similarly coupled to the output
gate 176 is the signal, R DATA, which is applied to
input port PB2 for the purposes of timing.
nal, GAIN ADJ, is provided from I/O bus 138 through
signal PA7 of microprocessor 166. This is a gain adjust
Consider briefly the timing protocol used on the
signal coupled through transistors 190 and 192 thereby
three wire bus. Normally, the bus is in a reset state, i.e.
C DATA and T DATA are both false. When either one
biasing node 194 at the input side of audio capacitor 182
to a point appropriate with the desired audio gain. Thus,
changes microprocessor 166 will be interrupted. The
the remote central controller can advise call box 10 to
message appearing on the T DATA line contains a bus 40 turn up the microphone volume as needed through the
direction ?eld, destination address ?eld and data ?eld.
manipulation of the T, and C DATA signals coupled to
When microprocessor 166 initiates communication, R
DATA data will go low indicating a request from pro
cessor 166. A logic unit in the transceiver will establish
microprocessor 166 which then appropriately generates
v the gain adjustv signal, PA7.
Similarly, the received audio from the remote central
bus direction and will expect to receive a message on 45 operator is coupled to terminal 196. Again, the received
the R DATA line. The message then display on R
DATA includes a source address ?eld, destination ?eld
audio signal is coupled through an audio capacitor 198
into an audio ampli?er generally denoted as reference
and data ?eld. When the request for service is answered
numeral 200. The feedback of audio ampli?er 200 in
by the transceiver, processor 166 will read the R
turn is controlled through the transistor 202 by means of
DATA line and the destination address ?eld of the 50 the gain adjust signal, GAIN ADJ, acting through the
incoming message. Processor 166 will place a ?rst bit of
output transistor 190. Therefore, the received audio
R DATA on the line at the start of a data state. During
gain coupled to input 204 of differential ampli?er 206
communication initiated by the transceiver the ?rst data
can be remotely operator adjusted through gain adjust
bit will appear on the R DATA line after the bus goes
signal GAIN ADJ. The output of differential ampli?er
from the reset state to the data state. The remaining data 55 206 in turn is coupled to the input of a push/pull ampli
will appear on the R DATA line during the idle state to
?er generally denoted by reference numeral 208. The
data state transition period. The last data bit of the
output of push/pull ampli?er 208 is coupled as the op
message will be held on the R DATA line a few micro
seconds after the T DATA and C DATA lines have
returned to the reset state to allow the bit to be read by
the control unit. During a communication initiated by
processor 166, processor 166 will hold the ?rst data bit
on the R DATA line until T DATA and C DATA lines
posing input to differential ampli?er 206 thereby main
taining the output 210 of differential ampli?er 206 at a
continual maximum. The output of push/pull ampli?er
208 is in turn resistively coupled through audio capaci
tor 212 to the receiver or ear piece terminals 214 in hand
set 40.
enter a data state at which time another bit is sent. At
Solar array 34 is also coupled to battery 46 through
the occurrence of each idle state, processor 166 will 65 controller 42 by means of a shunt regulator. The regula
read the R DATA line through gate 176 and compare it
tor is conventional and thus is not further shown in the
with what is being sent. If there is a con?ict, processor
166 will stop sending and vacate the bus. Processor 166
Figures. Coupling through the shunt regulator prevents
overcharging of battery 46 and thereby eliminates the
potential of any damage due to overvoltages or over
hours have elapsed since the last query at step 224, a call
report status routine is entered at step 226. At step 226,
The circuitry now having been generally described in
microprocessor 118 will enter a predetermined subpro
connection with FIGS. 4-9, turn to the flow diagram of
gram to telephone the central processing unit regarding
FIG. 12 which illustrates the basic operation of control 5 the status of call box 10. Thus, every twenty-four hours
ler 42. Upon power-up as indicted by step 201, a master
or on any other arbitrary schedule, each call box will
reset signal is generated to program control at step 203
call the central processing center, identify itself and
to reset all chips within the circuit. This step generates
report its current status or even a past log of activity.
any logic reset signals required by the microprocessors
Many modi?cations or alterations may be made by
118 or 166 or any other logic circuitry. In addition
those having ordinary skill in the art without departing
during this step the transceiver may execute any initial
from the spirit and scope of the invention. For example,
protocol operations. For example, in the case of the
the operational routine described at FIG. 10 is illustra
Motorola transceiver of the illustrated embodiment, the
tive only and any other means could be arbitrarily pro
best ground station or forward control channel is se
grammed into execution. It is to be expressly under
lected. Service is then established between the selected
stood that a different cellular transceiver, such as an
forward control channel and the call box. The trans
OKI model UM 1043B manufactured by OKI Electric
ceiver or microprocessor 118 then dials a prepro
Industries Co. Ltd of Atlanta, Ga., could be easily sub
grammed telephone number and sends identifying codes
stituted for the illustrated Motorola transceiver with
which establish the call box’s identity. These numbers
appropriate modi?cations to accommodate the substitu
‘ and codes are veri?ed and then communications is se
lectively established on a reverse channel when appro
priate. All this is protocol which is normally handled by
tion according to well know design principles.
Furthermore, it should be noted in connection with
the circuit diagrams of FIGS. 4-9 that call box 10 incor
porates a digital address bus, data bus, control bus and
I/0 bus. Therefore, it is entirely within the scope of the
the cellular transceiver and ground station and do not
strictly affect the operation of the invention as de
scribed here.
25 art that such generalized bus structures can be em
Thereafter, the outputs of each of the status chips are
ployed with other digital circuitry to expand the opera
set to zero or initialized at step 205. This corresponds to
the generation of various set signals shown as the output
of decoder 130 and as described in connection with the
tional capacities of call box 10. For example, a slow scan
video circuit can be appropriately coupled to the buses
if desired to provide visual information of traf?c condi
latches of FIG. 8.
30 tions at selected points. In addition, a data telemetry
Having cleared and set each of the status latches,
input subcircuit can similarly be coupled to the buses of
processor 118 then enters a self-test program to test the
call box 10 to allow, for example, for the transmission of
contents of memory 120 at step 207. Each self-test pro
digital medical data by paramedical emergency teams
gram is checked a predetermined plurality of times at
who may be attending an accident victim near the site
step 209. The test is repeated until it successfully passes 35 of a call box. Such emergency medical data could be
or a timeout occurs. Upon successful self-testing of
radio-telemetered from the accident site to the nearest
memory 120, processor 118 will then read the various
call box which would then retransmit to the nearest
status signals as step 211 as described in connection with
hospital without the necessity of lifting hand set 40 off
FIG. 8. Should the pole down signal, DWN, for exam
the hook or other direct wire coupling to the call box.
ple, be active as determined at step 213, processor 118 40 The call box could similarly be time share with environ
will then enter a specialized down routine at step 215 to
mental sensing and reporting systems. Virtually any
take whatever appropriate remedial action or reporting
device which could bene?t from a remote communica
as is desired in the case that the call box has been run
tions device could be easily combined and accommo
over or otherwise down on the ground.
dated by the open bus structure of the invention. The
After the down routine is completed, or there is no 45 adaptability of the invention is even further enhanced
pole down situation, processor 118 then determines at
step 216 whether the battery level is low. If the power
when it is realized that interactive digital and voice
communications is facilitated through callbox 10.
Therefore, the illustrated embodiment must be under
stood as being provided only for the purposes of exam
is low, it enters a power subroutine at step 218 and
performs any remedial action necessary in response to
low battery, such as unconditionally disabling the trans
ple and clarity and not as a limitation of the invention as
ceiver 44. Again, after execution of the low power
de?ned in the following claims.
routine or if the power is adequate, microprocessor 118
I claim:
will then inquire at step 220 whether an emergency call
1. A system for emergency call box service compris
is being placed. If an emergency caller is placing a call
by lifting hand set 40 off the hook, an emergency call 55
a plurality of emergency call boxes, wherein each call
routine is entered at step 222 wherein transceiver 44 is
box further comprises a controller, a cellular trans
powered up, a predetermined phone number is dialed or
ceiver coupled to said controller, a battery coupled
transmitted, together with speci?c identifying informa~=
to said controller for providing power to said con—
tion uniquely identifying call box 10. After the call is
troller and transceiver, and means for generating
completed, the processing again returns to step 210
where the status is reread.
If at step 220 an emergency call is not being placed,
an inquiry will be made at step 224 as to whether or not
a predetermined time interval has passed. In the illus
trated embodiment call box 10 incorporates a twenty 65
four-hour flag. If a twenty-four-hour interval has not
expired since step 224 was last queried, the processing
will return to step 210. If on the other hand, twenty-four
power coupled to said controller for recharging
said battery; and
a cellular telecommunications subsystem in radio
telecommunication with each of said plurality of
emergency call boxes, said cellular transceiver
being remotely progammable, said controller for
programming operation of said cellular transceiver
in response to information receivied from said cel
lular telecommunications subsystem wherein said
controller further comprises means for receiving
and processing information to initiate operations in
said controller,
whereby said plurality of emergency call boxes can
be installed which are capable of arbitrarily pro
system to selectively perform a remedial routine in
response to said step of reading said plurality of
status parameters dependent upon the condition of
each corresponding parameter in order to render
said call box operational;
selectively receiving said information at said plurality
of call boxes;
selectively entering an emergency call routine
gammable interactive operations.
2. The system of claim 1 further comprising inter
of?ce local telephone exchanges coupled to said plural
ity of call boxes wherein communication between said
cellular telecommunication subsystem and said plurality
of call boxes is selectively coupled through said inter
wherein a cellular telecommunications transceiver
within said call box is powered up and bidirectional
voice communication is established through said
of?ce local telephone exchanges.
cellular telecommunication system to said commu
3. An emergency roadside call box comprising:
a controller means for receiving remotely originated
nication applications processor,
whereby remotely powered emergency call boxes in
radiotelecommunication with said communication
a remotely programmable cellular transceiver cou
processor are operationally main
pled to and controlled by said controller, operation
of said cellular transceiver being initiated at least in
9. The method of claim 8 further comprising the step
part by said remotely originated information re
selectively reporting said plurality of status parame
ceived by said controller;
ters from each said call box through said cellular tele
a battery for powering said controller coupled to said
communication system to said communication applica
controller and transceiver; and
tions processor.
means coupled to said controller for recharging said
10. An apparatus in combination with a cellular radio
4. The call box of claim 3 further comprising a subcir 25 telephone for generating information compatible with
said cellular radiotelephone in an emergency call box
cuit for monitoring a user request for emergency trans
?rst means for determining a plurality of status condi
5. The call box of claim 3 comprising a subcircuit for
tions relating to said emergency call box;
monitoring presence of a communication transmitted to
second means for controlling power usage of said
and from said call box.
emerency call box to minimized power usage; and
6. The call box of claim 3 further comprising means
third means for processing said status conditions de
for selectively communicating a plurality of parameters
termined by said first means and responsive to at
of said call box to an off-site recipient.
least said second means, said third means for selec—
7. The call box of claim 3 wherein said controller
comprises means of conserving power from said battery
tively bidirectionally communicating cellular ra
diotelephone compatible signals, said third means
when an emergency communication is not desired.
8. Amethod in an emergency roadside call box, said
being coupled to said ?rst and second means and to
call box being battery powered and coupled through a
radio-telecommunication link to a cellular telecommu
said cellular radiotelephone, said third means being
remotely programmable to selectively process said
nication system and communication applications pro 40
cessor, said method comprising the steps of:
said cellular radiotelephone compatible signals and
reading a plurality of call box status parameters at a
selectively communicate said cellular radiotele
plurality of call boxes;
sending information from said communication applia
said apparatus in response thereto.
status conditions and to selectively communicate
phone compatible signals and selectively operate
cation processor or cellular telecommunication 45
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