ETSI ETS 300 143/A1 ed.1 (1996-01)

Integrated Services Digital Network (ISDN); Audiovisual services; Inband signalling procedures for audiovisual terminals using digital channels up to 2 048 kbit/s

RE/TE-04036

Digitalno omrežje z integriranimi storitvami (ISDN) – Avdiovizualne storitve – Postopki znotrajpasovnega krmiljenja pri avdiovizualnih terminalih, ki uporabljajo digitalne kanale s hitrostmi do 2 048 kbit/s

General Information

• Status: Published
• Publication Date: 18-Jan-1996
• Technical Committee: TE 4 - Audiovisual and Voice Terminals
• Current Stage: 12 - Completion
• Due Date: 12-Jan-1996
• Completion Date: 19-Jan-1996
• Ref Project: SIST ETS 300 143/A1 E1:2003 - Integrated Services Digital Network (ISDN); Audiovisual services; Inband signalling procedures for audiovisual terminals using digital channels up to 2 048 kbit/s

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 143/A1 E1:2003
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Avdiovizualne storitve –
Postopki znotrajpasovnega krmiljenja pri avdiovizualnih terminalih, ki uporabljajo
digitalne kanale s hitrostmi do 2 048 kbit/s
Integrated Services Digital Network (ISDN); Audiovisual services; Inband signalling
procedures for audiovisual terminals using digital channels up to 2 048 kbit/s
Ta slovenski standard je istoveten z: ETS 300 143/A1 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 143/A1 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 143/A1 E1:2003

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SIST ETS 300 143/A1 E1:2003
ETS 300 143
AMENDMENT A1
January 1996
Source: ETSI TC-TE Reference: RE/TE-04036
ICS: 33.080
ISDN, audiovisual services
Key words:
This amendment A1 modifies
the European Telecommunication Standard ETS 300 143 (1994)
Integrated Services Digital Network (ISDN);
Audiovisual services;
Inband signalling procedures for audiovisual terminals using
digital channels up to 2 048 kbit/s
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
*
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1996. All rights reserved.

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ETS 300 143: May 1994/A1: January 1996
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 143: May 1994/A1: January 1996
Foreword
This amendment to ETS 300 143 (1994) was produced by the Terminal Equipment (TE) Technical
Committee of the European Telecommunications Standards Institute (ETSI).
Transposition dates
Date of adoption of this ETS: 31 January 1996
Date of latest announcement of this ETS (doa): 30 April 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 October 1996
Date of withdrawal of any conflicting National Standard (dow): 31 October 1996

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SIST ETS 300 143/A1 E1:2003
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ETS 300 143: May 1994/A1: January 1996
Amendments
The proposed amendments are as follows:
Page 7, clause 1 (Scope), amend the present NOTE to read as NOTE 1 and add the following
second note:
NOTE 2: Terminals in accordance with this ETS can interwork with equipment conforming to
ITU-T Recommendation H.242.
Page 7, clause 2 (Normative references), add the following references:
[7] ITU-T Recommendation H.224 (1994): "A real time control protocol for simplex
applications using the H.221 LSD/HSD/MLP channels".
[8] Draft prETS 300 481: "Terminal Equipment (TE); Integrated Services Digital
Network (ISDN) B-Channel Aggregation; Procedures and terminal
requirements".
[9] ITU-T Recommendation T.122 (1993): "Multipoint communication service for
audiographic and audiovisual conferencing service definition".
[10] ITU-T Recommendation T.123 (1994): "Protocol stacks for audiographic and
audiovisual teleconference applications".
[11] ITU-T Recommendation T.124: "Generic conference control".
[12] Draft ITU-T Recommendation T.125 (1994): "Multipoint communication service
protocol specification".
[13] ITU-T Recommendation H.243 (1993): "Procedures for establishing
communication between three or more audiovisual terminals using digital
channels up to 2 Mbit/s".
[14] Draft prETS 300 483: "Terminal Equipment (TE); Integrated Services Digital
Network (ISDN); Multipoint communications for audiovisual services; Main
functionalities and basic requirements for Multipoint Control Units (MCUs)".
Page 8, clause 4 (Symbols and abbreviations), amend the following abbreviations to read as
follows and insert the note as given below:
H-MLP High speed MLP logical subchannel
MLP Logical data subchannel named "MLP"
NOTE: MLP was previously referred to the ITU-T Recommendation T.120 Multilayer Protocol,
but now is just a name for the logical subchannel which may contain T.120 or ITU-T
Recommendation H.224 [7] protocol, or Dummy data, see ETS 300 144 [1].
Page 9, subclause 5.1.1 (Audio capabilities), insert the following new paragraphs after the second
paragraph and before table 1 as follows:
At the beginning of the call the default encoding law shall be A-law. If information is available to the
terminal, either by configuration or by user input, as to whether the destination is within a μ-law region,
then this encoding law shall be used after the reception of the ALERTING message or, if the ALERTING
message is not received, the CONNECT message, or in-band signalling, as described in clause 6 has
been initiated.
The information shall be encoded using the μ-law at 64 kbit/s as defined in CCITT Recommendation
G.711 [3].

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ETS 300 143: May 1994/A1: January 1996
It is the responsibility of the calling terminal to ensure that correct encoding law is used. If no indication on
the coding law is available, the calling terminal shall use the default coding law while monitoring the
statistics of the incoming signal. In order to determine whether the incoming signal was encoded by A-law
or μ-law PCM, the algorithm described in appendix 1 to CCITT Recommendation G.725 [5] shall be used.
Page 11, subclause 5.1.9 (Rules for capability sets), amend the first paragraph to read as follows:
A capability set is valid if it conforms to the rules set out in this clause. If a received capability set is found
to have broken one or more of these rules it shall be considered invalid and consequently ignored. The
capability set consists of the capability marker (111) [24] followed by all currently valid values, in any order
(except for MPI values). No values other than {Null} shall be repeated within a set (except for MPI values,
see subclause 5.1.2).
Page 12, subclause 5.1.9 (Rules for capability sets), replace table 2 by the new table given below:
Table 2: BAS capabilities that can be included in a valid capability set
Audio Absent or one or more values from
{A-law, μ-law, G.722-48, G.728, Au-ISO} (ETS 300 144 [1], tables 8 & 10)
Video Absent, or
{ [(QCIF plus one MPI value) or (CIF plus two MPI values)] and/or
 video-ISO}
Transfer rate Absent (meaning rate = 64 kbit/s only, see also note), or
{ no or one value of {1B; 2B; 3B; 4B; 5B; 6B}, and/or
 no or one value of {1H0; 2H0; 3H0; 4H0; 5H0}, and/or
 H11, and/or
 H12, and/or
 any relevant values from {128, 192, 256, 512, 768, 1 152,
 1 472 kbit/s}}
Restricted network Absent or present
Single/multiple channel Absent or {SM-comp} or {6B-H0-com}
Compatibility
Low-Speed Data (LSD) Absent or all relevant values (ETS 300 144 [1], table 8)
High-Speed Data (HSD) Absent or all relevant values (ETS 300 144 [1], table 10)
Low-speed MLP Absent or all relevant values or MLP Set1 or MLP Set2 (ETS 300 144 [1],
tables 8 & 10)
High-speed MLP Absent or all relevant values (ETS 300 144 [1], table 10)
Applications in data channel Absent or all relevant values (ETS 300 144 [1], table 12)
Encryption Absent or present
Multiple-Byte Extension Absent or present
NOTE: When reducing the transfer-rate capability to 64 kbit/s from an higher rate, the value (001)[0]
shall be included.
Page 12, subclause 5.1.9 (Rules for capability sets), amend the first sentence after the two bullet
points of the text to read:
Repetition of the capability set is limited to 10 seconds - see subclause 6.1.1.
Page 13, sublause 5.2.3 (LSD/MLP commands), modify the first paragraph to read as follows:
5.2.3 LSD/MLP commands
Fixed rate LSD/MLP cannot penetrate into Audio bit positions. It can reduce its capacity within the data bit
positions currently occupied.

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ETS 300 143: May 1994/A1: January 1996
Page 14, subclause 5.2.4 (Rules for commands), replace table 3 with the table given below:
Table 3: Command summary
Attribute Alternative values Default Comments
(value sent last is valid assumed
only)
Audio (000) [0, 4-7, 18-19, 24-31] [18]
Transfer rate (001) [0-16, 23, 24, 26, 29] [0]
(001) [17] See subclause 7.5
Video and (010) [0-3] [0]
other (010) [6, 7] [7]
(010) [16] Cancelled by command in video frame
(010) [17] Expires after fast update completed
(010) [18, 21] [21]
(010) [19, 21] [21]
(010) [20, 21] [21]
(010) [23, 26] [26]
(010) [27, 28] [28]
LSD (011) [0-15, 31] or [0-31] [0] Simultaneous LSD and MLP may be
sent only if {H.224-sim}
MLP (011) [16-30] or [0-31] [16] Has been received - see ITU-T
Recommendation H.224 [7]
HSD **(011) [0, 17-22] [0]
H-MLP **(011) [2-8, 13, 14] [14] **Reached from
Au-ISO **(001) [0-22] [0] escape table (111)[16]
**(001) [23, 24] [24]
**(001) [25-28] [25]
Page 15, subclause 6.1 (Capability exchange (sequence A)), replace by the text given below:
This sequence involves the transmission by both terminals of their current capability sets. Either terminal
may initiate the sequence and there is no problem caused by both doing so simultaneously or nearly
simultaneously. Capability BAS should not be sent unnecessarily when the incoming signal is unframed.
The sequence is used in various procedures, in which the initiating terminal wishes to inform the other of
its own capability set (for example at the start of the call or when the capability set has been changed), or
wishes to check the current capability set of the other (for example in a fault a fault recovery procedure),
or both.
When a terminal activates sequence A during a call, it shall maintain the current mode of multimedia
multiplexing, including FAS and BAS in additional channels if relevant.
A terminal which is intended to interwork with a Channel Aggregation Unit according to draft
prETS 300 481 [8], on receiving the command [capex], shall immediately initiate this sequence A unless a
capability exchange is already in progress: in the latter case, the terminal shall continue the sequence,
ensuring that at least one complete capability set is transmitted after receipt of [capex].
Page 15, subclause 6.1.1 (Initiating terminal), delete the last paragraph and insert the following
text:
If X receives any further capability sets before expiry of timer T , it shall not respond to this by repeating
1
its own capability set; after expiry of T , it shall respond according to subclause 6.1.2.
1
Capability sets shall not be sent continuously for more than 10 seconds: if necessary, the sequence sh
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