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«© BLACK BOX 33.6 Dual Modem Card:
- MDU905C
74
Data-Link 33.6 Dual Modem Card
TECHNICAL: (0118) 965 6000
SALES: (0118) 965 5100
FAX: (0118) 965 5001
ADDRESS: 464 Basingstoke Road, Reading, Berkshire RG2 0QN
WEB: www.blackbox.co.uk
Data-Link 33.6 Dual Modem Card
How To Contact your Local Black Box
Italy:
Black Box Italia S.P.A
Tel: 02.27.400.280
Fax: 02.27.400.219
Web Site: www.blackbox.it
Deutschland:
Black Box Deutschland
Tel: 0811/5541-0
Fax: 0811/5541-499
Web Site: www.blackbox-deutschland.com
Switzerland:
Datacom Black Box Services AG
Tel: 05545170 70
Fax: 0554517075
Web Site: www.black-box.ch
Netherlands:
Black Box Datacom BV
Tel: 030-2417700
Fax: 030-2417777
Web Site: www.blackbox.n!/
Belgium:
Black Box
Tel: 02/725.85.50
Fax: 02/725.92.12
Web Site: www.blackbox.be
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Australia:
Black Box Catalog Australia PTY LTD
Tel: 039879 7100
Fax: 039870 2955
Brazil:
Black Box Do Brasil.
Tel: (011) 5515-4000
Fax: (011) 5515-4002
Web Site: www.blackbox.com.br
Canada:
Black Box Canada Corp.
Tel: 0416-736-8000
Fax: 0416-736-7348
Web Site: www.blackbox.com
Mexico:
Black Box De Mexico S.A. de C.V
Tel: (5)-420-0100
Fax: (5)-420-0123
Web Site: www.blackbox.com.mx
Japan:
Black Box Catalog
Tel: (03) 3820-5011
Fax: (03) 3820-5010
Web Site: www.blackbox.co.jp/
France:
Black Box Catalogue
Tel: 01.45.60.67.00
Fax: 01.45.60.67.47
Web Site: www.blackbox.fr
Spain:
Black Box Comunicaciones S.A.
Tel: 091 663 0200
Fax: 091 661 84 35
Web Site: www.blackbox.es
Data-Link 33.6 Dual Modem Card
U.S.A
Black Box Corporation
Tel: 724-746-5500
Fax: 724-746-0746
Web Site: www.blackbox.com
Chile
Black Box Chile
Tel: 6680 141
Fax: 6680 140
Web Site: www.Blackbox.cl
TECHNICAL: 0118 965 6000 Oo 3
Data-Link 33.6 Dual Modem Card
Contents
INÉTOQUCHION eects testes etna e sesso t sees ar esate renee enter te 6
TRE MOUBIM cee career seese sereine en raraeaeene everest 6
The MOdEM-fAX ….........…..….….………………wrccércrcrererrrricerscerrerevrrrrenre rer rensreesanéasene casse ear area ae se ass ase 6
Calling modes dialinQ 0... EEE 6
Calling Mode................... eee eee eee eee eee eee eterna. 7
Answering MOR... eee Dee 7
Protocols...................eimee nene ne Reena reee Deer ree e nes ae een ea 7
No EN 7
INSEAIALION EN 8
Rackmount VErSiON teb eters esterases tetera 8
Power-up Self-teSt a... EEE 9
Орегайпо тодез$...........онннннсннненннннннннннннннннннннннннннннннзненннненннненнннуннннннннненннннеенненененныы 9
Operating modes..............................eeerien teeter esterase raster erectos 9
The Front Panel... eens 10
The Push Button Mode % ................. 22. e ner eee en creer Deere rreenec 10
Dialogue ..................meimi nee nee enero reee nee enererererererarerere rrerererer renacer eneoes 11
Configurations...................—......ee einen ee nee er Deere eee ee ererererenererererenerereren ese 12
Factory configuration ........................e.emeee EEE EEE EEE 12
Rate and connection mode Selection ……………………….…………………rerererirenmenmentennnntnnnnnnnnnnnnnn 12
NOtes:..............erercorecenececerarecorerecceneeorareecerencecarereceoocererecenvocerocenvecenorerrerecerce eee. 13
Error correction and data compression: ...........................eeie ee DI DI IR RD IR Rs 14
РО\/ СОП(ГО! NN 14
Automatic dialing directory a... EEE EEE 14
Saving USEr CONfIQUratiONS ……………………….…………ceusrrerereeemente-eremensenresesanesecenesses esse eee 15
V54 —- Maintenance .................... eee e se ceps cena sece ses e ressens crane care rene ne rene er rence 15
AT command operation.………….….………….….………cccrececenennsntstnennennnnnnnnnnnnnnnnnnn 16
Security and memory.................. eee eee eee resserre bebe ebb esate erate ene 18
PRINCIPES rer écrerreree re srer rer evrn enr cen rnere aerea rieerecnrTererDereeeerrrn ener eee 18
The phone [email protected] …………..….….….….….….…rreescerrerersrrrerenere cer erereren errant er eee eee 19
AnswerbacK SECUFItY va... EEE 19
Call Back SECUFity………...….…..…..…….……crcrrrrerrreerererenrenvrnreneacrr cr erene rene eee eee ee 20
Dial number request call-back........................... ne e enero er ere e erroneo reee errores 20
Inactivity password........................0m.e eter rte 21
SpecificatioONS NN eben eter 22
Line side characteriStiCS …………………….…….……………reresrereensentenenesrenrrerenere sentence cessera esse 22
Automatic call & AnsWer …………….…….…….…………cicrrerrercersereerensenrenrens TER 22
Originating Bnrcrccsrcsasasrerssense ravi onessensossosaesrecaren rennes er raser en na cc areas EEE 22
Answering a Calle cee eee eben 22
Connection - Disconnection.........................re ee ees 23
ear: MIA) -1ní- TETE 23
4 € SALES: 0118 965 5100
Data-Link 33.6 Dual Modem Card
Fax-mode BAIE 23
Automatic Call And ANSWEr..….……..….………érrrreccrerrer rare rene rene anse ana ra 23
Transmission Modes rer ccécrrerr rare anr crane anse encre aan eee nes 23
Operating Mode........................inieni eee reee eee 23
Service Class 1 Command Set........................ rie e ere ie eater rare erre reereer ener 23
Service Class 2 Command Set.......................... ii re ercer cer rrreererrereeereereeces 24
General characteristics .........................r.imim e ri Der rare ereaarrrerererererecericeeaeERIrCRe rene cerecEne Ene —s 24
Dgo Tio [--1a/0/0]111|o PA 26
Appendix A ZE terete, 27
Appendix B - Country specific information …………….……………….………eeseeenmnsentnnnennnnnnnnnnnnnn 28
TECHNICAL: 0118 965 6000 o 5
_Data-Link 33.6 Dual Modem Card
Introduction
This section is to familiarize the user with the operation of a modem. Note: <CR> indicates
that the user must press the return key after a command sequence.
The modem
A modem is a device that allows two terminals (DTE, PC...) to communicate via a
telecommunication line (phone line).
The data 1s converted by the modem into electrical signals adapted to the telecommunication
network. This conversion is called modulation and demodulation.
Various conversion techniques have been developed to speed-up the data flow. The different
speeds are particular to each type of modulation: 300 bps in V21, 2400 bps in V22bis, 14400
bps in V32bis, 19200 bps in V32terbo and 33600 bps in V34.
The modem-fax
A fax device transmits scanned images via the telephone network.
In addition to traditional fax machines, the fax modem also allows transfer of computer data
such as:
e ASCII files from a text processor,
e PCX or TIF files from a graphic editor, etc.
The Fax mode operation is controlled by a fax software which:
e Converts files to T4 format (fax graphic format),
e Transmits and receives faxes,
e Supervises fax modem operation.
Supervision of the fax modem is carried out by a standard protocol: "Asynchronous Facsimile
DCE Control Standard", Class 1 Service - TR 29.2188 or Class 2 Service - TR 29.2388.
The computer equipped with a fax modem will be able to transmit and receive fax in Group
HI mode:
e At about one A4 page per minute,
e In fine or standard resolution.
See Specifications section, page 22, for the list of modem class | and 2 commands.
Calling modes dialing
The modem can be in 2 modes:
e Send or calling,
e Receive or answer.
6 € SALES: 0118 965 5100
Data-Link 33.6 Dual Modem Card
Calling Mode
The modem switches to originate mode when the dial command: ATD 37487126 is sent
(example number).
The calling modem then waits for the remote modem to respond.
Answering Mode
The modem switches to answer mode when it detects ringing on the phone line.
The answer is carried out automatically if the command ATS0 = 2 was sent to the modem by
the local PC. À training sequence is then initiated. À training sequence is the handshake
sequence between modems to establish a communication link. It establishes speed, modes...
Protocols
Two types of protocols can be used to improve communication performance between two
modems:
e Error correction:
e MNP4 or V42 detect errors which occurred during data transmission, and either
correct them or re-transmit the data.
e [Data compression:
e MNPS5 or V42bis compress the data and thus transmit at a higher effective speed.
These two types of protocols improve efficiency and reliability of a connection.
Memory
Beyond these basic principles, the modem offers other functions, aimed at improving
performance and ease of use.
These functions are controlled via the memory (S-Registers) of the modem, and are available
via the extended AT command set.
These functions are described in security and memory section, page 18, of this manual.
Some of the extra functions are:
Storage of phone numbers,
Forced V24 signals,
Exchange of a password between two modems ("Answer Back"),
Pre-qualification of the telephone line,
Storage of user modem configuration.
TECHNICAL: 0118 965 6000 <P „
| Data-Link 33.6 Dual Modem Card
Installation
Rackmount version
Package Contents:
Before installing your modem, check all these items are present:
One MDU905C card
Two RJ11 phone cables
Two RJ45/DB25 cables
AT command set reference manual
User manual
Software (as an option)
The busy out function forces the line to be active when there is:
A faulty power supply,
No answer to a call after N rings (N is set by the S20 register). This maybe due to a
non-connected data terminal (DTR/108 absent).
N successive ineffective connection sequences (N is set by the S20 register). This
maybe due to a bad connection to the telephone line.
This option is particularly useful for line pooling applications, and in case of fault, incoming
calls are switched to another modem in the pool.
Your MDU905C board provides an interface to the CF1 controller board that is an option to
your Data-Link rack. Refer to the CF1 manual for managing the MDU905C modem through
the CFI board.
Installation:
See rack operation manual to install your modem.
Find an empty location in the rack and insert the MDU905C card into its card guide.
Connection:
Connect your modem from the rear of the rack, according to the following diagram:
Data-Link 33.6 Dual Modem Card
Power On:
Inserting the modem card connects it to the power supply of the rack. Power-on is carried out
by the power switch located at the rear of the rack.
Power-up self-test
When the modem is turned on, an automatic self-test is performed, which tests:
e [ts program memory
[ts data memory
[ts stored memory
Its data processing unit
The test lasts a few seconds and ends with a series of:
e Different tones if the test is ok,
e The same tone if a failure is detected. This failure is detailed by the ATi7 command.
See page 26, "Troubleshooting".
Operating modes
Operating modes
The modem can operate in one of the four following modes:
|. IDLE MODE:
e The modem enters the idle mode after powering up if it passes its power-up self test.
Beeps announcing the end of the test can be heard unless the speaker is turned off (see
corresponding command).
e From this mode, the modem will enter in command mode by receiving a command
from the DTE, or in ONLINE mode if an automatic call is initiated from the front
panel, or if a call is received when the modem is configured to answer calls.
2. COMMAND MODE:
e The modem enters the command mode when it receives a recognized command. In
this mode, commands are interpreted and executed. (Configuration set up - automatic
call request...). The modem also enters in command mode when it recognizes an
escape sequence in the data when in an on-line rude.
TECHNICAL: 0118 965 6000 o 9
Data-Link 33.6 Dual Modem Card
ONLINE MODE:
e The on-line mode starts, when detecting a carrier signal from a remote modem or
when dialling is successfully completed.
TEST:
e The test mode is selected when in a command mode using appropriate test commands.
The Front Panel
The front panel of the modem has six red LEDs and two push buttons. The different LEDs
indicate the state of the modem and the status of the self test sequence.
The following table list these functions:
Indicators | Circuit | Function
DTR 1/2 108 Indicates that the data terminal equipment connected
to the modem is ready for data communication (also
bad Ram during power up test).
CD 1/2 109 Indicates that the remote modem's carrier signal has
been received by the modem. In test mode, this light
will flash if the test is negative. Also flashes if bad
ram during power up test.
DATA 1/2 103/104 | Flashes as data is transmitted by the modem.
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The Push Button Mode V2
MODE2
The MODE push button programs different functions depending on the current
mode: |
[n Command Mode:
e Performs automatic dialling of the number stored in memory or holds the line
in originate mode if no number was stored, or starts answering if rings were
detected on the line. The length of the press is signalled by a single flash of
the DSR LED. a
e A twosecond push holds the line in answer mode. The length of this push is
signalled by two flashes of the DSR LED. da
e If the button is pressed for more than 10 seconds (three flashes of the DSR IMOE I
LED), the modem resets.
In Online Mode: |
e Pressing the button once disconnects the modem and selects idle mode again
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о ©
Data-Link 33.6 Dual Modem Card
Dialogue
For your first dialogue with your modem, install a communication software on your micro-
computer.
Your MDU905C modem will recognize automatically the communication speed and format
of your computer, up to 115200 bps, as soon as you enter the following characters:
Answer: Displays configuration pages.
Identification model.
e AT <CR> (Carriage return)
e Answer: OK
e ATI3 <CR>
e Answer: AJ 2890 FTRX Rev-4.19*
e AT&S <CR>
©
*
Once this first dialogue is established, the reference manual will help you to perform
complete operation of your modem.
TECHNICAL: 0118 965 6000 o 11
- Data-Link 33.6 Dual Modem Card
Configurations
This section describes commonly used configurations through the AT command set: These
commands may be used as part of software drivers for example.
Factory configuration
This configuration applies when the modem is first powered on, or after complete reset by the
following commands:
AT& W255 <CR>
e Answer: OK
oe ATZ <CR>
e Answer: OK
This configuration is designed for most common applications and has the following
characteristics:
DTE - V24:
e Normal CD, DTR,
e DSR activated on handshake,
e CTS controlled by DTR in command mode and RTS in on line mode.
Automatic answer SÓ = 2
Automatic hunt: V34, V32bis, V32, V22bis, V21 and V23 modes
Error correction and data compression: V42bis and MNP automatic mode (S0?)
Flow control: RTS/CTS
This configuration can be modified for a specific application. The following examples
describe the most common applications.
Rate and connection mode selection
The MDU905C provides several solutions to determine the mode of connection.
e Selecting connection mode for speeds of 2400 to 19200bps: the modem can connect
these speeds in V34 mode or in older V22, V22Bis, V32Bis or V32 is modes. The AT
@OM command selects the wanted mode of connection This command should be left
as (@OM3 for automatic mode adaptation since the V34 mode is designed to
recognise V32 / V32Bis remote modems during the handshake.
e Auto baud: the modem recognises automatically the speed and the data format of the
terminal when it sends an AT command. If the 'full' auto baud is active - AT (VA! -
then the modem will adapt the connection rate to the nearest lower connection speed.
This is the default factory configuration. The auto baud must be changed to select a
special speed. It can be limited to the DTE auto baud - AT @A2 - which means that
the modem still recognises the terminal data format and speed but does not change the
connection rate. Alternatively, it can be disabled - AT @AO - which means that both
the DTE data format and speed, and connection mode are selected by Commands.
12 € SALES: 0118 965 5100
Data-Link 33.6 Dual Modem Card
The following picture lists all connection modes on the first row, and the configuration in full
auto baud and limited or disabled auto baud.
Rate - Modem auto baud : AT Al | DTE autobaud : [email protected] or [email protected]
modulation | DTE speed / AT command AT command
300 - V21 300 / - (@M0
1200T,75T - | Modem can not be auto baud @M10
V23
75R,1200T - | Modem can not be auto baud @M11
V23
1200 - V22 1200 / AT @OM2 @OM2 @M1
2400 - V22 2400 / AT @OM2 (@OM2 @M2
Bis
4800 - V32 4800 / AT @OM2 @OM2 @M3
9600 V32 9600 / AT @OM2 @OM2 @M4
7200 - V32 V32Bis fall down speed @OM2 @M9
Bis
12000 - V32 V32Bis fall down speed @OM2 @M5
Bis
14400 - V32 V32Bis fall down speed @OM2 @M6
Bis
16800 - V32 V32Ter fall down speed @OM2 @M7
Ter
19200 - V32 19200 / AT @OM2 @OM2 @M8
Ter
2400 - V34 2400 / (DOM3 (DOM3 (UM2
4800 - V34 4800 / @WOM3 @OM3 @M3
7200 - V34 V34 fall down speed @OM3 @M9
9600 - V34 9600 / @OM3 @OM3 @M4
12000 - V34 V34 fall down speed @OM3 @M5
14400 - V34 V34 fall down speed @OM3 @M6
16800 - V34 V34 fall down speed @OM3 @M7
19200 - V34 19200 / @OM3 @OM3 @M8
21600 - V34 V34 fall down speed @OM3 @M12
24000 - V34 V34 fall down speed @OM3 @M13
26400 - V34 V34 fall down speed @OM3 @M14
28800 - V34 V34 fall down speed @OM3 @M15
31200 - V34 V34 fall down speed @OM3 @M16
33600 - V34 >= 38400 / @OM3 @OM3 @M17
Notes:
e The status page 3 details all information on DTE and modem speeds, data format,
parity, synchronous or asynchronous mode (answer to the AT&S3 command).
TECHNICAL: 0118 965 6000 Oo 13
| Data-Link 33.6 Dual Modem Card
Error correction and data compression:
The modem is set in default factory configuration in automatic mode so that it can negotiate
the best protocol with the remote modem.
Flow control should be configured in asynchronous mode to avoid loss of received data.
The following commands apply:
Command Function
*MO direct mode, no protocol. The modem is transparent to the transferred
data. No flow control is possible. The XON.XOFF flow control is
passed over the line.
“M1 Normal, no protocol. The modem buffers transferred data. Flow control
can be RTS-CTS or XON XOFF.
“Me Automatic. The modem tries to negotiate V42 or MNP modes
Exclusive. The modem only accepts connection in the configured
“M3 protocol.
*T Protocol type : MNP (*T1), V42 (*T2), automatic (*T3).
*G Error alarm : the internal high speaker may beep when it detects an
errored packet in the received data flow (*G0 : disable, *G1 : enable).
Flow control:
Through Xon-Xoff : :
AT *LGI generates a local Xon-Xoff,
AT *LRI answers to the local Xon-Xoff
These commands are the original commands. For compatibility with standard general
purpose modems the following command may be used: AT &K4
Through RTS-CTS:
AT *LG2 generates a CTS flow control
AT * LR2 answers to the RTS flow control
АТ %С! sets the CTS signal for flow control
ATER! sets the RTS signal for flow control
The *LG and %LR commands are the original commands. For compatibility with standard
general purpose modems the following command may be used: AT &K3
Automatic dialing directory
Each port of the MDU90SC has a non-volatile memory that allows the user to store
frequently used numbers. Each phone number can have a name and control sequence
associated. Therefore, instead of remembering every number, the user can type in the
recipient name, thus greatly easing the task of making a connection.
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Data-Link 33.6 Dual Modem Car
The following example shows how to store a number, name and control sequence at location
3 of the directory memory.
Dialling a direct line, send the command:
e ATDT36062424 <CR>
Dialling via a PABX, send the command:
e ATDPOW36062424 <CR>
Storing a number in the directory (number 3), send the command:
e AT&Z3:NAME:CONTROL:POW36062424:::A <CR>
Show directory contents, send the command:
e ATEN <CR>
Dialing trom the directory:
e The ATDSn command dials the stored telephone number specified by n where n is 0
to 99.
e By CCITT 108/1 operation. The modem autodials a stored number when an off-to-on
transition of the DTR occurs. The modem disconnects when an on to off transition of
the DTR occurs. AT&D1 command selects the dialling mode of the DTR signal.
e By the phone number name by the ATD$name command.
Saving user configurations
The MDU905C modem can store up to 2 user configurations.
The AT& Wn command saves the current configuration in non-volatile memory (n = 0 or |).
This configuration is saved even when the modem is turned off. The modem will load the last
saved user configuration at power-up.
V54 — Maintenance
The MDU905C modem provides V54 loop test functions.
The A terminal can monitor the following tests:
Analogue local loop or B3: the A modem connects on its own carrier. The A terminal
can check characters it sends are well returned. The good operation of the A modem is
tested.
Remote digital loop or B2: the B modem sends back all characters received from the
line. The A terminal can test the entire link to the remote modem.
TECHNICAL: 0118 965 6000 o 15
d
Data-Link 33.6 Dual Modem Card
AT command operation
The status page 10 lists all V54 test features (command AT&S10)
e B 3: local analogue loop: the A modem is in local command mode. The local loop
may be started by the following commands:
e AT&TI: simple loop. The modem connects and sends a CONNECT xxxx message.
All characters sent by the A terminal are sent back after modulation.
e AT&TS: in the same kind of local loop the A modem sends and checks automatically
test characters. The error counter is displayed at the end of test.
e End of test: the test ends at the test timeout defined by S18, or by entering an escape
sequence (*+++' Jand an ATE TO command
e Front panel LED: the CD led is on when the modem is connected.
Example: A A
ATETI <RC>................. start the test
CONNECT 19200............. Connect message
ABCDE...............eemeec0... characters sent by the terminal
Fd oinonnaao aereo erac e A. Escape to command mode
OK
AT&TO. oii, End of test command
e Note: the connection status (AT&s8) page can be displayed during the test after an
escape to command mode.
e B 2: remote digital loop: modems are connected before starting the test. The remote
loop on the B modem is initiated from modem A by the following commands:
o AT&T6: simple loop. The A terminal checks returned characters. The
connection must be done without any error correction protocol (AT*M1)
o AT&T7: same loop with automatic character sending and checking by the A
modem. It displays the error counter at the end of test. The connection must be
done without any error correction protocol (AT*M1)
o End of test: the test ends at the test timeout defined by the S18 register, or by
entering an escape sequence (‘+++’) and an AT&TO command.
o Front panel LED: on the B modem, the CD led flashes and the CTS signal is
dropped during the test.
16 «€ SALES: 0118 965 5100
e Example:
A A
Data-Link 33.6 Dual Modem Card
Connection at 19200bps
data link between the A and B terminals.
escape to local command mode on modem A
requests a remote digital loop to B modem
Characters issued by the A terminal are sent
back by the B modem
End of test
Return to connected mode and reactivate the
TECHNICAL: 0118 965 6000 o 17
Data-Link 33.6 Dual Modem Card
Security and memory
Principles
The modem contains three types of memory:
The PROM, where factory configuration is stored permanently,
The RAM, where the modem configurations are stored temporary,
The NVRAM where semi-permanent data is stored even when the modem is turned
off.
The first time your modem is turned on, or after a complete reset, these three memories are
identical and set to the default factory configuration.
The AT&Wn command saves the current configuration in the non-volatile memory, (n = 0 or
|).
The last stored user configuration will be loaded automatically on next power-up.
These memory operations are shown on the following diagram:
PROM NV-RAM
Factorv Stored
AT&W255 | |!
confiauration confiauration
\ L
ATEW
AT&F
A Active /
confiauration |d& AT%m or
Power-up
RAM
Memory reset AT8&W255 —
Memory store AT&WO or AT&W1
Loading of a factory configuration without loosing the stored {| AT&FO or AT&F1
memory
Loading the user configuration AT% M0 or AT%M1
18 <> SALES: 0118 965 5100
ink 33.6 Dual Modem Card
The phone directory
Up to 100 phone numbers can be stored in the modem's non-volatile memory, to be used by
the automatic dialler.
Save a number | AT&Z0:Directory::11:::A
This command saves automatically the directory in non-volatile memory
Dial a number ATDSO <CR>
Display the directory ATEN <CR>
Answerback security
This security mode is controlled by the answering modem, and relies on a password
exchange, which authorizes a modem connection, le.
Callina A í
modem DL dem
ATDxxx — > ring
- Training >
"AC24Y" — "AC24Y"
(for example) control process
If the answerback matches the one stored in memory within two seconds after an ENQ code
was sent by the answering modem, access is granted. Otherwise, the modem disconnects
automatically.
To store the answerback code, see the following example. The password can be up to 12
characters long.
Store answerback (for example: AC24Y) AT&A:AC24Y:AC24Y <CR>
To disable answerback security AT&A:: <CR>
TECHNICAL: 0118 965 6000 o 19
Call Back Security
HERE | THERE
N 3132 N 4142
ATSO=2 ATS0=2
AT%SB1 AT%SA1
AT&Z3:HERE:CALLB1:3132:::CD
ATD4142 Calling
Training
Password?
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Data-Link 33.6 Dual Modem Card
This security mode is controlled by the
answering modem.
It sends a password and then calls back the
telephone number associated with that
password.
See %SA and %SB commands in the
reference manual.
This double security guarantees password and localization of the calling modem.
Dial number request call-back.
The remote user may provide the call-back number after password control.
Example:
HERE | THERE
N 3132 N 4142
ATS0=2 ATS0=2
AT%SB1 AT%SA1
ATEZ3:HERE:MOBILE:::
ATD4142 Dialing
Training
Password?
4 4
« MOBILE » EN
Callback number?
4———]—
3132
Y
Disconnect
Dial (3132)
+
Training
Ч
Modems are connected
+— — —
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A
Data-Link 33.6 Dual Modem Card
Inactivity password
The modem asks for a password when no data passes through it for a presented delay. If this
password matches the operator or supervisor password stored in memory then the modem
will reconnect otherwise it will drop the line.
$32: number of minutes of inactivity that will start the password request.
$96: number of seconds that the modem will wait for the password.
AT%ST 0/1: number of password trials (0: one trial / |: three trials).
AT%In: inactivity is detected if:
n=0: no detection, i.e. feature is disabled.
n=1: detects transmitted data inactivity.
n=2: detects received data inactivity.
n=3: detects both received and transmitted data in activities.
AT%PS: SUPER: SUPER: stores the supervisor password, (SUPER as an example).
AT%PO: OPE:OPE: stores the operator password (OPE as an example).
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Data-Link 33.6 Dual Modem Card
Specifications
Line side characteristics
Mode Switched network
Receiver sensitivity -43 dBm
Carrier detection:
Open threshold <-48 dBm
Close threshold > -43 dBm
Transmission level:
Nominal - 10 dBm
Maximum - 8 dBm
Minimum -16 dBm
|
Recommendations | Cal/Answer | Speed Bps | Xmit 0 | Xmit1 | Received 0 | Received 1
V22 bis Call 2400 1200 | 1200 2400 2400
Answer 2400 2400 | 2400 1200 1200
V22 Call 1200 1200 | 1200 2400 2400
Answer 1200 2400 | 2400 1200 1200
\/21 Call 300 1180 | 980 1850 1650
Answer 300 1850 | 1650 1180 980
V23 Call 75 450 390 2100 1300
Answer 1200 2100 | 1300 450 390
V32 9600 1800 Hz
V32 bis 14400 1800 Hz
V32 terbo 19200 1800 Hz
V34 33600 Adaptive
Automatic call & answer
Originating
Automatic dialing or calling by the originating modem is initiated by:
e "AT" or V25bis commands
Push button on front panel
DTR 108/1 being enabled
Pulse or tone dialing.
Tone recognition occurs when there 15:
e A dial request (public network or private exchange).
e A busy line.
e The call monitoring by the internal high speaker can be disabled.
e
Answering a Call
When the modem is set in answer mode, it will go off hook after 2 rings (if the command
ATS0=2 is sent). This is in conformity with CCITT V25bis recommendation.
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»
ink 33.6 Dual Modem Card
Connection - Disconnection
In calling mode, the modem will automatically recognize the remote modem modulation type
and adapt correspondingly.
It will disconnect only if:
e The carrier is lost,
e No carrier tone is detected within 35 to 90 seconds,
е No data activity has occurred for the selected period of time dictated by the Inactivity
Timer.
Serial interface
The V24 serial interface of the modem conforms to the DCE specifications. A straight ribbon
cable is all that is needed to connect to the DTE port of your computer or terminal. The serial
port will automatically recognize DTE speeds up to | 15200 bps. This is called auto-bauding.
Fax-mode
Automatic Call and Answer
See page 22.
Transmission Modes
The modem provides the ability to send and receive faxes at speeds up to 9600 bps. The
following modulations are supported:
ITU-T
V21 300 1650 - 1850
V27 ter 2400 / 4800 1
V29 7200 / 9600 1700
Operating Mode
In fax mode, the modem support the following standards:
e Group lll Fax, EIA 578 class | and class 2 compatible,
e CCITT T4 - T30 recommendations.
Service Class 1 Command Set
The following AT commands control the operation of a class 1 modem/fax:
+FCLASS Service class identification and control
+FTS Stop transmission and wait
+FRS Receive silence
TECHNICAL: 0118 965 6000 o „3
Data-Link 33.6 Dual Modem Card
+FTM Transmit mode
+FRM Receive mode
+FTH Transmit T30 command mode
+FRH Receive T30 command mode
+FCERROR Error code
Service Class 2 Command Set
The following AT commands control the operation of a class 2 modem/fax:
+FCLASS Service class identification and control
+FMDL Fax-modem model
+FMFR Fax-modem manufacturer
+FREV Fax-modem checkup
+FBUG Frame report
+FAA Automatic answer
+FBOR Data bit order
+FDCC Fax-modem capability selection
+FDIS Capability initialization for transmission
+FLID Identification selection of the fax-modem
+FCON Remote fax detection
+FCIG Identification of called subscriber by СТС
+FCSI Identification of called subscriber by CSI
+FTSI Identification of calling subscriber by TSI
+FDTC Called fax return capability - DCS frame
+FDCS Discussed capability for process - DCS frame
+FHR Content of received frame
+FHT Content of transmitted frame
+FBUF? Buffer state
+FDT Fax message transmission
+FPTS Page transmission result
+FDR Fax message reception
+FCFR Reception mode confirmation
+FPTS Remote reception status
+FET End of page status
+FHNG End of procedure status
+FAXERR Error code
General characteristics
Dimensions: Length: 260 mm,
Width: 170 mm,
Height: 35 mm.
Weight: 0,5kg.
External power supply module: 230V/50Hz.
Power consumption: 5Vdc / 0.8A.
Operating temperature: 0 to 50°C.
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›‚ ®
ink 33.6 Dual Modem Card
Relative humidity: 0 -> 90% non-condensing.
Conforms to European security standards: EN41003, EN60950,
Conforms to European Electromagnetic Standards: EN50082, EN55022.
TECHNICAL: 0118 965 6000 e 25
Data-Link 33.6 Dual Modem Card
Troubleshooting
Problem:
This section lists most modem operating problems.
Problem Check
No tone when Connection to the mains. On/Off switch in On position. Power supply
modem is turned of the rack and fuse of the card (rack version), DTR indicator on or
on flashing
Single and Send commands:
continuous tone AT&W255 <CR>
when modem is
turned on ATZ <CR>
Then restart the modem to see if the same continuous tone is heard.
See Ati7 section below.
Modem does not | Flashing of the DATA indicator when sending characters. No flash:
answer commands | check V24 cable. Flashes: <CR> command:
AT&S4 <CR>
and check for a long flash of DATA indicator. Long flash: check V24
cable.
Modem answers Try to dial an outside line using the ADT command. Make sure that
"NO DIAL TONE" | you select a valid telephone number and dialing mode (P-Pulse, T-
Tone). Listen to the internal speaker to hear the normal dial tone is
heard. If not check the line connection.
Modem refuses to | Check for any blacklisting:
dial AT&NB <CR>
(see reference manual) Turning the modem off and on resets the
blacklist.
ATI7 command:
Check the answer to the AT17 command. It provides a clear message in case of self-detected
problem.
ATI7 Response |
BAD ROM Code EPROM checksum bad
BAD RAM Write and read failure in RAM
BAD NON VOLATILE Non volatile memory checksum bad
MEMORY
BAD DSP ROM DSP checksum bad
BAD DSP DSP bad
ALB FAILED Analog loopback test bad
If problems persist or any assistance is required, please contact Black Box technical
support.
SALES: 0118 965 5100
26 ©
Data4Link 33.6 Dual Modem Card
Appendix A - V24 Signals
RJ45/DB25 cable:
RJ45 DB25
1 Non connected
2 6 Data Set Ready (107)
7 8 Carrier Detect (108)
4 20 Data Terminal Ready
(108)
5 7 Ground (102)
6 3 Receive Data (104)
7 2 Transmit Data (103)
8 5 Clear to send (106)
9 4 Request to send (105)
10 22 Ring indicator (125)
(optional)
V24-V28 interface
12345678910
Dial line connector: RJ11 connector
Pin Signal
| Not used 123456
2 Telset Tip |
3 Tip PSTN
4 Ring PSTN — I
5 Telset Ring
6 Not used
TECHNICAL: 0118 965 6000 Oo 27
Data-Link 33.6 Dual Modem Card
Appendix B - Country specific information
UK | Although this equipment can use either loop disconnect or DTMF signaling, only
the performance of the DTMF signaling is subject to regulatory requirements for
correct operation. It is therefore strongly recommended that the equipment is set
to use DTMF signaling for access to public or private emergency services. DTMF
signaling also provides faster call set up.
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