General Technical Characteristics of Fixed Telecommunications

HKTA 2201
ISSUE 5
AUGUST 2005
GENERAL TECHNICAL CHARACTERISTICS
OF FIXED TELECOMMUNICATIONS NETWORKS
IN HONG KONG
TELECOMMUNICATIONS AUTHORITY
HONG KONG
FOREWORD
1.
In order to facilitate network interconnection and service interoperability between
wireline equipment and the fixed telecommunications networks, there is a need to
specify the relevant technical characteristics on the network side. This specification
defines the general technical characteristics of the fixed telecommunications networks
in Hong Kong. The Fixed Telecommunication Network Services (FTNS) operators
shall comply with this specification as well as other applicable codes of practice and
guides issued by the Telecommunications Authority (TA).
2.
As different switching systems and technologies are employed by the FTNS operators,
the characteristics of each network may differ. Details of the individual network
characteristics and services offered are available direct from the FTNS operators.
Contact information of the FTNS operators can be found in the information note
OFTA I 412 titled "How to apply for certification of customer premises equipment to
be connected to the public telecommunications network in Hong Kong" issued by the
Telecommunications Authority (TA).
3.
The Telecommunications Authority (TA) reserves the right to revise the contents of
this specification without prior notice. Amendments or re-issues of this specification
may not be distributed automatically to the FTNS operators and equipment
manufacturers / suppliers and it will be their responsibility to ensure that their
equipment conform to the latest requirements.
4.
The TA accepts no responsibility for the satisfactory end-to-end performance of
wireline equipment connected to the networks of the FTNS operators. This
specification does not address performance, reliability or quality-of-service
parameters.
5.
The HKTA series specifications and information notes issued by the TA can be
obtained through one of the following methods:•
downloading direct through the Office of Telecommunications Authority's
(OFTA)’s Internet Home Page. The Home Page address is
http://www.ofta.gov.hk;
•
making a request for hard copies to :Senior Telecommunications Engineer
Standards Section
Office of the Telecommunications Authority
29/F Wu Chung House
213 Queen’s Road East
Wanchai
Hong Kong
Fax : +852 2838 5004
Email : standards@ofta.gov.hk
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE i
6.
Enquiries about this specification may be directed to :
Senior Telecommunications Engineer
Standards Section
Office of the Telecommunications Authority
29/F Wu Chung House
213 Queen’s Road East
Wanchai
Hong Kong
Fax: +852 2838 5004
Email : standards@ofta.gov.hk
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE ii
AMENDMENT HISTORY
Item
Issue No.
Paragraph
Descriptions
1.
Issue 2
Foreword
Update information for FTNS operators and for OFTA
2.
Issue 2
Clause 1
Include editorial changes
3.
Issue 2
Clause 2
Rewrite as clause 2.1 to 2.2
4.
Issue 2
Clause 3
Change title to “Numbering”.
Rewrite clause 3.1 and delete clauses 3.2 and 3.3
5.
Issue 2
Clause 4
Change title to “Basic Characteristics of Direct Exchange Line”
Move original requirements on basic ringing signal to clause 4.2.
Add new clauses 4.1, 4.3 and 4.4
6.
Issue 2
Clause 5
Change title to “Basic Tone Characteristics”
Include editorial changes and restructure clauses 5.1 to 5.4.
clarification on power levels of basic tones
7.
Issue 2
Clause 6
Include editorial changes
Restructure clause 6.3.1 as clauses 6.3.1 to 6.3.3
8.
Issue 2
Clause 7
Delete original clause 7.1
Move old clause 7.2 to 7.1.
Make
Add new clauses 7.2 and 7.3
9.
Issue 2
Clause 8
Update reference documents
10.
Issue 2
Annex 1
Include editorial changes and add information on supplementary
ringing signals
11.
Issue 2
Annex 2
Include editorial changes
12.
Issue 2
Annex 3
Add new Annex 3 on nominal pad settings of FTNS operators
13.
Issue 3
Clause 4
Revise clause 4.1.6 regarding the timing value
14.
Issue 3
Clause 5
Delete clause 5.4 regarding requirement on other tones
15.
Issue 3
Clause 7
Update the references to ITU-T recommendations in clauses 7.1 and
7.2
16.
Issue 3
Clause 8
Update the categories of ITU-T recommendations in clause 8.3
17.
Issue 3
Annex 2
Include editorial changes
18.
Issue 4
Clauses 8 and 9
19.
Issue 4
Annex 1
Update company names of FTNS operators
20.
Issue 4
Annex 2
Update company names of FTNS operators
HKTA 2201 ISSUE 5
AUGUST 2005
Add new clause 8 on POTS splitter characteristics; previous clause 8
moved to clause 9
PAGE iii
Item
Issue No.
Paragraph
21.
Issue 4
Annex 3
Update company names of FTNS operators
22.
Issue 4
Annex 4
Add new Annex 4 : Characteristics of POTS Splitter for Broadband
Type-II Interconnection at the Exchange Side of the Fixed
Telecommunications Networks in Hong Kong
23.
24.
25.
Issue 5
Issue 5
Issue 5
Foreword
Clause 4.2.5
Clause 5.2.2
HKTA 2201 ISSUE 5
AUGUST 2005
Descriptions
Editorial amendments.
Update the requirement on ringing time-out.
Update the requirement on ringing tone.
PAGE iv
CONTENTS
1.
SCOPE
2.
NETWORK CONNECTION SPECIFICATION
3.
NUMBERING
4.
BASIC CHARACTERISTICS OF DIRECT EXCHANGE LINE
5.
BASIC TONE CHARACTERISTICS
6.
BASIC ANALOGUE TRANSMISSION CHARACTERISTICS
7.
BASIC DIGITAL TRANSMISSION CHARACTERISTICS
8.
SPLITTER CHARACTERISTICS FOR PARTIAL BANDWIDTH OPTION
9.
REFERENCE
Annex 1
Summary of the Ringing Signals of the Fixed Telecommunications
Networks in Hong Kong
Annex 2
Summary of the Basic Tones of the Fixed Telecommunications Networks in
Hong Kong
Annex 3
Nominal Pad Settings of the Fixed Telecommunications Networks in Hong Kong
Annex 4
Characteristics of POTS Splitter for Broadband Type-II Interconnection at the
Exchange Side of the Fixed Telecommunications Networks in Hong Kong
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE v
1.
SCOPE
This technical specification defines the general technical characteristics of the fixed
telecommunications networks in Hong Kong.
2.
NETWORK CONNECTION SPECIFICATION
2.1
USER-TO-NETWORK CONNECTION
The fixed telecommunications network (the network) shall be able to work with
customer premises equipment (CPE) which comply with the relevant HKTA 20XX
series specifications issued by the Telecommunications Authority (TA).
2.2
NETWORK-TO-NETWORK CONNECTION
The network shall comply with the relevant HKTA 22XX series specifications issued
by the TA for network-to-network connection.
3.
NUMBERING
3.1
The network shall have numbering structure and digit handling capability to support :
(a)
The Numbering Plan for Telecommunications Services in Hong Kong issued
by the TA; and
(b)
ITU-T
Recommendation
E.164
Telecommunication Numbering Plan”.
on
“The
International
4.
BASIC CHARACTERISTICS OF DIRECT EXCHANGE LINE
4.1
BASIC LINE AND DIALLING SIGNALS
4.1.1
Idle State Condition
Public
The idle state condition of the direct exchange line (DEL) is equivalent to the on-hook
state. The idle state condition of the DEL on the network side shall be earth on Tip
(A-wire) and a nominal voltage of -40 to -48 Vdc on Ring (B-wire).
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 1
4.1.2
Seizure Signal
The network shall support loop-start method used by the CPE as a seizure signal for
DEL.
4.1.3
Dialling Signal
The network shall support both tone dialling (DTMF signalling) and pulse dialling
(loop-disconnect signalling) signals sent by the CPE.
4.1.4
Answer Signal
Answer signal to the CPE of the calling party is an optional network facility.
If answer signal is provided by the network to the CPE of the calling party, the answer
signal shall be a reversal of line polarity when the CPE of the called party answers the
call, i.e. negative voltage on Tip and earth on Ring. The magnitude of the negative
voltage on Tip will depend on the d.c. loop condition in off-hook state.
4.1.5
Clear Signal
The network shall recognise the disconnection of seizure loop (i.e. restoration to idle
state) by the CPE for a duration of 1 second or more as a clear signal for release of a
call connection.
4.1.6 Re-answer Supervision
When clear signal is sent by the CPE of the called party and re-answer supervision is
supported by the network, the network shall release the call connection when the
restoration to idle state has been maintained by the CPE of the called party until the
expiry of network re-answer supervision timing. The re-answer supervision timing
shall have a maximum value of 40 seconds.
Note: The long-term objective of re-answer supervision timing is 20 seconds maximum.
4.2
BASIC RINGING SIGNAL
4.2.1
General
The basic ringing signal is the signal sent from the network to the CPE of the called
party for call set-up purpose. The network shall provide basic ringing signal with
characteristics as defined in clauses 4.2.2 to 4.2.5.
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 2
4.2.2
Ringing Frequency and Voltage
Frequency : Range from 20 Hz to 28 Hz
Voltage
4.2.3
: Ringing voltage of 75 + 20 Vrms shall be superimposed on -40 to -48
Vdc (at exchange side with line impedance of 0 to 1000 Ω).
Ringing Cadence
The cadence for the basic ringing signal shall be as follows with tolerance of + 10%:0.4 second ON
0.2 second OFF
0.4 second ON
3.0 second OFF
4.2.4
Immediate Ringing Cadence
If immediate ringing is provided by the network, the first ON period of the first cycle
of the ringing cadence described in clause 4.2.3 shall be in the range of 0.4 to 0.9
second.
4.2.5
Ringing Time-Out
If ringing time-out is provided by the network, ringing shall automatically be ceased
by the network after about 1 to 2 minutes. Upon ringing time-out, the called DEL
shall be restored to idle state condition and busy tone shall be returned to the calling
party in place of ringing tone as specified in clause 5.2.2.
4.2.6
A summary on the existing characteristics of the basic ringing signals of the fixed
telecommunications networks in Hong Kong is tabulated in Annex 1.
4.3
SUPPLEMENTARY RINGING SIGNALS
4.3.1
Supplementary ringing signals other than the basic ringing signal defined in clause
4.2 for the operation of enhanced customer services is optional network facility.
If supplementary ringing signals are provided by the network, the ringing signals shall
have technical characteristics same as the basic ringing signal except for the ringing
cadence defined in clause 4.2.3.
4.3.2 A summary on supplementary ringing signals provided
telecommunications networks in Hong Kong is given in Annex 1.
HKTA 2201 ISSUE 5
AUGUST 2005
by
the
fixed
PAGE 3
4.4
HOOK FLASH SIGNAL
4.4.1
Hook flash signal is an optional network facility to support operation of enhanced
customer services.
If hook flash signal is supported by the network, the network shall recognise the
momentary disconnection of seizure loop by the CPE for a duration of 300 to 700 ms
as a hook flash signal and differentiate it from the clear signal defined in clause 4.1.5.
5.
BASIC TONE CHARACTERISTICS
5.1
GENERAL
The network shall provide the basic tones as defined in clause 5.2. The basic tones
shall have the technical characteristics defined in clause 5.3.
5.2
DEFINITION OF TONES
5.2.1
Dial Tone
When the calling party initiates a call to the network, dial tone shall be returned as
soon as the network is in a state ready to receive the incoming dialling signals. The
tone shall be removed as soon as the network detects the first dialled digit.
5.2.2
Ringing Tone
When the called party is ready to receive a call, a basic ringing tone, complying with
the technical characteristics in clause 5.3, or other forms (such as music, songs etc.)
can be returned to the calling party.
5.2.3
Busy Tone (Customer Busy)
Busy tone shall be returned to the calling party when the called party is engaged or in
a "locked-out" condition.
5.2.4
Congestion Tone (Network Busy)
Congestion tone shall be returned to the calling party when the network is busy.
5.2.5
Number Unobtainable (NU) Tone
Number unobtainable tone shall be returned to the calling party to indicate that the
called number is :
•
out of service,
•
a spare code or number,
•
the access code of a service which is not available to the calling party, or not
accessible due to certain service restrictions.
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 4
5.3
TECHNICAL CHARACTERISTICS
5.3.1
Frequencies And Cadences
(a)
The frequency and cadence of the basic tones are defined in the following table.
Item
Type of Tone
Frequency (Hz)
Cadence (Second)
i.
Dial Tone
350 + 440
Continuous
ii.
Ringing Tone
440 + 480
0.4 sec ON / 0.2 sec OFF /
0.4 sec ON / 3.0 sec OFF
iii.
Busy Tone
480 + 620
0.5 sec ON / 0.5 sec OFF
iv.
Congestion Tone
480 + 620
0.25 sec ON / 0.25 sec OFF
v.
Number
Unobtainable Tone
480 + 620
Continuous
(b)
The frequency tolerance for the above tones is ±1.0%.
(c)
The cadence tolerance for the above tones is ±10%.
5.3.2
Power Levels
(a)
In accordance with ITU-T Recommendation E.180 (equivalent with Q.35), the power
levels of the ringing tone, busy tone, congestion tone, and number unobtainable tone
are defined at a zero relative level point at the incoming (in the traffic direction) end
of the network-to-network interface (see Figure 1). For the combined tone signals
resulting from combination of frequency components, the power levels so defined
shall have a nominal value of -10 dBm0 measured with continuous tone (or -16 dBm0
at the main distribution frame (MDF) of the local exchange of the network) and the
values shall be in the range -5 to -15 dBm0 (or -11 to -21 dBm0 at the MDF).
(b)
For the power level of the dial tone, the point of reference is the MDF of the local
exchange of the network, where the DEL is connected. The absolute power of the
combined tone signal at the 2-wire access in the direction towards the CPE is
normally in the range of –10 dBm ± 5 dB. To avoid interference with multi-frequency
push button receivers at the local exchange, dial tone level higher than -10 dBm
should be avoided.
(c)
Each harmonic shall not exceed -50 dBm or shall be at least 30 dB below the signal
level for individual frequency component.
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 5
5.3.3
A summary on the existing characteristics of the basic tones provided by the fixed
telecommunications networks in Hong Kong is tabulated in Annex 2.
6.
BASIC ANALOGUE TRANSMISSION CHARACTERISTICS
6.1
PASS-BAND
All the exchange lines and trunks of the network shall have a nominal pass-band of
300 to 3400 Hz, with 600 Ω nominal non-reactive terminating impedance for
telephony services. Echo cancellers / suppressers will not be provided by the
operators.
6.2
LOCAL LOOP ATTENUATION
The local loop for the exchange lines and trunks of the network shall have attenuation
less than 10 dB at 1600 Hz depending on the length of the loop.
6.3
JUNCTION (INTER-EXCHANGE CIRCUITS) LOSS
6.3.1
Pad Settings For Transmission Paths
Figure 1 shows the pad settings T and R for the "send" path and the "receive" path
respectively between the network side and the CPE side. As a general principle, it is
required that the ITU-T Recommendations concerning loudness ratings (G.121) and
stability & echo (G.122) be followed.
6.3.2 The individual values for T and R in conjunction with the nominal CPE loudness rating
performance shall meet the long term objectives for loudness rating requirements
referred to the Virtual International Connecting Points (VICP) as specified in G.121,
i.e.
Send Loudness Rating (SLR) = 7 to 9 dB;
Receive Loudness Rating (RLR) = 1 to 3 dB
6.3.3 The nominal value of the differential loss (R-T) is 6 dB at 1600 Hz; in all cases (R-T)
shall be in the range of 3 to 9 dB.
Note:
The nominal values of the T and R pads set by the fixed telecommunications
networks in Hong Kong are given in Annex 3.
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 6
Network 1
Interface
0 dBr
0 dBr
T
Network 2
0 dBr
R
"Send"
"Receive"
CPE
CPE
MDF
MDF
"Receive"
"Send"
R
0 dBr
Legend :
T
T
0 dBr
0 dBr
Analogue Transmission
Analogue-Digital Coder
Digital Transmission
Digital-Analogue Decoder
Analogue Pads
Digital Switching
R
Figure 1 Pad Setting for Transmission Paths
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 7
6.3.4
The junction circuits (inter-exchange circuits) of the network are fully digital with no
attenuation loss. Taking into account the local loop attenuation and the pad setting,
a telephone call within Hong Kong may have an overall nominal attenuation of 26 dB
(10 dB local + 6 dB pad setting + 10 dB local).
6.3.5
International circuits of the network are fully digital. The nominal attenuation
between the CPE and the international gateway is 10 dB (10 dB local + 0 dB pad
setting) for the "send" path and 16 dB (10 dB local + 6 dB pad setting) for the
"receive" path respectively.
6.4
TRANSIENT VOLTAGES AND INTERFERENCE COMPONENTS
The network under normal circumstances may have transient voltages imposed upon it
which may reach a peak of several hundred volts. Interference power components
that may exist on exchange lines and trunks shall be subject to the following limits :
-
Longitudinal induced voltages up to 20 Vrms at 50 Hz.
-
Uniform spectrum and random noise having a power up to -45 dBm over the band
300 to 3400 Hz.
-
Random impulse noise up to -22 dBm.
7.
BASIC DIGITAL TRANSMISSION CHARACTERISTICS
7.1
DIGITAL TRANSMISSION CHARACTERISTICS AT 1544 kbit/s (T1)
Where digital interfaces are employed by the network at 1544 kbit/s, the following
characteristics shall be followed:
(a)
The physical/electrical characteristics of the 1544 kbit/s digital interface shall
be in accordance with the relevant section of ITU-T Recommendation G.703.
(b)
The basic frame structure and characteristics of the 1544 kbit/s digital interface
shall be in accordance with the relevant sections of ITU-T Recommendation
G.704.
(c)
The control of jitter and wander for the 1544 kbit/s digital interface shall
comply with ITU-T Recommendation G.824.
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 8
7.2
DIGITAL TRANSMISSION CHARACTERISTICS AT 2048 kbit/s (E1)
Where digital interfaces are employed by the network at 2048 kbit/s, the following
characteristics shall be followed:
7.3
(a)
The physical/electrical characteristics of the 2048 kbit/s digital interface shall
be in accordance with the relevant section of ITU-T Recommendation G.703.
(b)
The basic frame structure and characteristics of the 2048 kbit/s digital interface
shall be in accordance with the relevant sections of ITU-T Recommendation
G.704.
(c)
The control of jitter and wander for the 2048 kbit/s digital interface shall
comply with ITU-T Recommendation G.823.
DIGITAL TRANSMISSION CHARACTERISTICS AT OTHER HIERARCHY BIT
RATES
Where digital interfaces are employed by the network using digital hierarchy bit rates
other than 1544 kbit/s and 2048 kbit/s, the technical characteristics shall follow
internationally accepted standards.
8.
SPLITTER CHARACTERISTICS FOR PARTIAL BANDWIDTH OPTION
8.1
POTS SPLITTER
Where line-sharing with telephony services using a pass-band specified in Clause 6.1
is required to implement the partial bandwidth option of Broadband Type II
Interconnection, a splitter shall be provided at the exchange side. The technical
characteristics of the splitter shall follow the specification tabulated in Annex 4.
9.
REFERENCE
9.1
Network Connection Specifications issued by the TA
HKTA 20XX Series
HKTA 2201 ISSUE 5
AUGUST 2005
Network Connection Specifications for Connection
of Customer Premises Equipment (CPE) to the
PAGE 9
Public Telecommunications Networks (PTNs) in
Hong Kong
HKTA 22XX Series
Network
Connection
Specifications
for
Network-to-Network Connection of the Public
Telecommunications Networks (PTNs) in Hong
Kong
9.2
The Numbering Plan for Telecommunications Services in Hong Kong issued by the
Telecommunications Authority
9.3
Relevant Recommendations issued by the ITU-T
E-Series Recommendations
Overall Network Operation, Telephone Service,
Service Operation and Human Factors
G-Series Recommendations
Transmission Systems and Media, Digital
Systems and Networks
P-Series Recommendations
Telephone Transmission Quality, Telephone
Installations, Local Line Networks
Q-Series Recommendations
Switching and Signalling
- END -
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 10
Annex 1
Item
1.
Description
b.
Basic Ringing
Signal
Frequency
(min, max.)
Hz
Cadence
c.
Voltage
d.
e.
a.
Summary of the Ringing Signals of the Fixed Telecommunications Networks in Hong Kong
Reference Value
Adopted by the
TA
(20 ,
28 )
PCCW-HKT Telephone
Ltd.
(23.5, 27.5)
Wharf T&T Ltd.
(WT&T)
Hutchison
Global
Communications
Ltd. (HGC)
New World
Telecommunications Ltd.
(NWT)
20
with tolerance
+/- (1/3) Hz
0.4 sec ON,
0.2 sec OFF,
0.4 sec ON,
3.2 sec OFF
(22, 28)
(22, 28)
0.4 sec ON,
0.2 sec OFF,
0.4 sec ON,
3.0 sec OFF
0.4 sec ON,
0.2 sec
OFF,
0.4 sec ON,
3.0 sec
OFF
Remarks
20
with tolerance
+/- (1/3) Hz
0.4 sec ON,
0.2 sec OFF,
0.4 sec ON,
3.0 sec OFF
All Complied
0.4 sec ON,
0.2 sec OFF,
0.4 sec ON,
3.0 sec OFF
with tolerance of
+/- 10%
0.4 sec ON,
0.2 sec OFF,
0.4 sec ON,
3.0 or 3.2 sec OFF
75 +/- 20 Vrms
superimposed
on -40 to -48V
dc (at exchange
MDF)
75 +/- 20 Vrms
superimposed on -40 to -48V
dc (at exchange MDF)
86 Vrms
75 +/- 20Vrms
75Vrms
86 Vrms
All Complied
Immediate
Ringing
If applicable, the
range should be
0.4 to 0.9 sec.
The first ON period of the
first cycle of ringing cadence
may vary from 0.4 to 0.8 sec.
Not Applicable
0.4 to 0.9 sec
Not
Applicable
Not
Applicable
All Complied
Ringing
Time-out
If applicable, the
range should be
60 to 120 sec.
About 120 sec. Upon
time-out, the called DEL will
restore to idle status and
busy tone will be returned to
the calling party in place of
ringing tone.
120 seconds
60 to 120 sec
Not
Applicable
120 seconds
All Complied
HKTA 2201 ISSUE 5
AUGUST 2005
All Complied
PAGE 1 OF ANNEX 1
Item
2.
a.
b.
Description
Supplementary
Ringing
Signals
Frequency,
Voltage,
Immediate
Ringing, and
Ringing
Time-out
Cadence
Reference Value
Adopted by the
TA
PCCW-HKT Telephone
Ltd.
Wharf T&T Ltd.
(WT&T)
Hutchison
Global
Communications
Ltd. (HGC)
New World
Telecommunications Ltd.
(NWT)
Same as 1a and
1c to 1e
Same as 1a and 1c to 1e
Same as 1a and 1c
to 1e
Same as 1a and 1c
to 1e
Same as 1a
and 1c to 1e
Same as 1a
and 1c to 1e
Nil Requirement
DN 'B' of Duplex Ringing
Feature:
1.2 sec ON, 3.0 sec OFF
Option 1:
1.2 sec ON, 3.0 sec
OFF
DN 'B' of Duplex
Ringing Feature :
1.2 sec ON, 3.0
sec OFF
Not
specified
Not
specified
Remarks
All Complied
Option 2:
0.4 sec ON, 0.2 sec
OFF, 0.4 sec ON,
0.2 sec OFF, 0.8
sec ON, 0.4 sec
OFF
Option 3:
0.5 sec ON, 0.5 sec
OFF, 1.0 sec ON,
0.5 sec OFF, 0.5
sec ON, 3.0 sec
OFF
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 2 OF ANNEX 1
Annex 2
Item
Description
1.
Dial Tone
i. Frequency (Hz)
ii. Cadence
2.
3.
Ringing Tone
i. Frequency (Hz)
ii. Cadence
Busy Tone
i. Frequency (Hz)
ii. Cadence
HKTA 2201 ISSUE 5
AUGUST 2005
Summary of the Basic Tones of the Fixed Telecommunications Networks in Hong Kong
Reference Value
Adopted by the
TA
PCCW-HKT
Telephone Ltd.
Wharf T&T Ltd.
(WT&T)
Hutchison
Global
Communications
Ltd. (HGC)
New World
Telecommunications Ltd.
(NWT)
Remarks
All Complied
350 + 440
Continuous
350 + 440
Continuous
350 + 440
Continuous
350 + 440
Continuous
350 + 440
Continuous
350 + 440
Continuous
440 + 480
0.4 sec ON,
0.2 sec OFF,
0.4 sec ON,
3.0 sec OFF
440 + 480
0.4 sec ON,
0.2 sec OFF,
0.4 sec ON ,
3.0 or 3.2 sec OFF
(the first ON
period of the first
cycle of ringing
tone may vary
from 0.4 to 0.8 sec
due to the
application of
immediate ringing
tone)
440 + 480
2.0 sec ON,
4.0 sec OFF
440 + 480
0.4 sec ON,
0.2 sec OFF,
0.4 sec ON,
3.0 sec OFF
440 + 480
0.4 sec ON,
0.2 sec OFF,
0.4 sec ON,
3.0 sec OFF
440 + 480
2.0 sec ON,
4.0 sec OFF
480 + 620
0.5 sec ON,
0.5 sec OFF
480 + 620
0.5 sec ON,
0.5 sec OFF
480 + 620
0.5 sec ON,
0.5 sec OFF
480 + 620
0.5 sec ON,
0.5 sec OFF
480 + 620
0.5 sec ON,
0.5 sec OFF
480 + 620
0.5 sec ON,
0.5 sec OFF
New equipment
purchased and
installed by WT&T
and NWT after 1
January 1999 shall
comply with the
reference value
All Complied
PAGE 1 OF ANNEX 2
Annex 2
Item
Description
4.
Congestion Tone
i. Frequency (Hz)
ii. Cadence
5.
6.1
Number
Unobtainable Tone
i. Frequency (Hz)
ii. Cadence
Power Level of
Ringing Tone,
Busy Tone,
Congestion Tone
and Number
Unobtainable Tone
HKTA 2201 ISSUE 5
AUGUST 2005
Summary of the Basic Tones of the Fixed Telecommunications Networks in Hong Kong
Reference Value
Adopted by the
TA
PCCW-HKT
Telephone Ltd.
Wharf T&T
Ltd.
(WT&T)
Hutchison
Global
Communications
Ltd. (HGC)
New World
Telecommunications Ltd.
(NWT)
Remarks
All Complied
480 + 620
0.25 sec ON,
0.25 sec OFF
480 + 620
0.25 sec ON,
0.25 sec OFF
480 + 620
0.25 sec ON,
0.25 sec OFF
480 + 620
0.25 sec ON,
0.25 sec OFF
480 + 620
0.25 sec ON,
0.25 sec OFF
480 + 620
0.25 sec ON,
0.25 sec OFF
All Complied
480 + 620
Continuous
480 + 620
Continuous
480 + 620
Continuous
480 + 620
Continuous
480 + 620
Continuous
480 + 620
Continuous
Combined tone
power level shall
have nominal
value of -10
dBm0 measured
with continuous
tone (or -16
dBm0 at the
MDF) and the
values shall be in
the range
-5 to – 15 dBm0
(or -11 to
-21dBm0 at the
MDF)
At the local
exchange MDF
power level of
each single
frequency tone
component is
-19 +/- 1 dBm,
giving a combined
tone power level
of
-16 +/- 1 dBm
Combined tone
power level
Ringing Tone :
-16 dBm
Busy Tone :
-21 dBm
Congestion tone :
-21 dbm
Number
unobtainable tone :
-10 dBm
Combined tone
power level is in
range -13 dBm to
-21 dBm
measured at the
MDF
Combined
tone power
level is -13 +/1 dBm
Combined tone
power level
Ringing Tone :
-16 dBm
Busy Tone :
-21 dBm
Congestion
tone :
-21 dbm
Number
unobtainable
tone :
-21 dBm
New equipment
purchased and
installed by WT&T
and NWT after 1
January 1999 shall
comply with the
reference value
PAGE 2 OF ANNEX 2
Annex 2
Summary of the Basic Tones of the Fixed Telecommunications Networks in Hong Kong
Item
Description
Reference Value
Adopted by the
TA
PCCW-HKT
Telephone Ltd.
Wharf T&T Ltd.
(WT&T)
6.2
Power Level of
Dial Tone
The absolute power
level of combined
tone measured at
the local exchange
MDF shall be in
the range of –10
dBm ± 5 dB and
level higher
than –10 dBm
should be avoided
Same as 6.1
Combined tone
power level for
dial tone is
-10 dBm
7.
Frequency
Tolerance
of Tone
+/- 1%
+/- 0.5 %
+/- 0.5 %
+/- 1%
+/- 4Hz
+/- 1%
All Complied
8.
Cadence Tolerance
of Tone
+/- 10%
+/- 10%
+/- 10%
+ /- 10%
+/ - 10 ms
+/- 10%
All Complied
9.
Harmonic of Tone
Either one of the
followings is
accepted : a) less than
-50 dBm ; or
b) 30 dB below the
signal level.
30 dB below the signal
level for individual
frequency components
Less than -55
dBm
At least 30
dB below
signal level
All Complied
HKTA 2201 ISSUE 5
AUGUST 2005
Less than -50 dBm
At least 30 dB
below signal level
Hutchison
Global
Communications
Ltd. (HGC)
Same as 6.1
New World
Telecommunications Ltd.
(NWT)
Same as 6.1
Combined
tone power
level for
dial tone is
-10 dBm
Remarks
All Complied
PAGE 3 OF ANNEX 2
Annex 3
Nominal Pad Settings of the Fixed Telecommunications Networks in Hong Kong
The nominal values of the T and R pads (see clause 6.3.3 of this specification) set by the FTNS
operators in Hong Kong are as follows:
FTNS Operator
T/R
PCCW-HKT Telephone Limited
New World Telecommunications Limited
Hutchison Global Communications Limited
Wharf T&T Limited
0 / 6 dB
0 / 6 dB
0 / 7 dB
2 / 8 dB
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 1 OF ANNEX 3
Annex 4 Characteristics of POTS Splitter for Broadband Type-II Interconnection at the
Exchange Side of the Fixed Telecommunications Networks in Hong Kong
Parameter
Insertion Loss
Insertion Loss Distortion
Return Loss
Reference Clause in ITU-T
Rec. G.992.1 Annex E
E.1.3
E.1.4
E.1.2
Delay Distortion
E.2.3.1.4
Longitudinal Balance
E.2.3.2.1
ADSL Band Attenuation
E.2.4.1
Loading of ADSL Signal Path E.2.4.2
Capacitance in Idle State
E.2.3.3.1
DC Resistance with U-interface E.2.2
Open
DC Resistance with U-interface E.2.2
Shorted
Performance Requirement
(Frequency
Limit)
1004 Hz
< 1 dB
250 – 4000 Hz
< +/- 1 dB
300 Hz
> 14 dB
1000 Hz
> 18 dB
2000 Hz
> 18 dB
3400 Hz
> 14 dB
200 – 600 Hz
< 250 µs
600 – 3200 Hz
< 200 µs
3200 – 4000 Hz
< 250 µs
200 – 1000 Hz
> 58 dB
3000 Hz
> 53 dB
32 – 300 kHz
> 65 dB
300 – 1104 kHz
> 55 dB
30 – 1104 kHz
< 0.25 dB
20 – 30 Hz
< 0.3 µF
> 5 M ohms
< 25 ohms
NOTE:
1.
For measurement of loss or loss distortion, a matching impedance of 600 ohms shall be used
for termination.
2.
The method of measurement shall follow that specified in the corresponding reference
clause in the ITU-T recommendation.
3.
For Capacitance in idle state, some legacy equipment may have a value of up to 0.5 µF.
HKTA 2201 ISSUE 5
AUGUST 2005
PAGE 1 OF ANNEX 4
Download PDF