IEC 60728-9:2000/AMD1:2005

Amendment 1 - Cabled distribution systems for television and sound signals - Part 9: Interfaces of cables distribution systems for digitally modulated signals

General Information

• Status: Published
• Publication Date: 26-Jun-2005
• ICS: 33.040.40 - Data communication networks
• ICS: 33.060.40 - Cabled distribution systems
• ICS: 35.110 - Networking
• Technical Committee: TA 5 - Cable networks for television signals, sound signals and interactive services
• Current Stage: PPUB - Publication issued
• Start Date: 15-Oct-2005
• Completion Date: 27-Jun-2005

Relations

• Amends: IEC 60728-9:2000 - Cabled distribution systems for television and sound signals - Part 9: Interfaces of cabled distribution systems for digitally modulated signals
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC


STANDARD 60728-9


  2000



AMENDMENT 1

2005-06

Amendment 1
Cabled distribution systems for television
and sound signals –
Part 9:
Interfaces of cables distribution systems
for digitally modulated signals
 IEC 2005 Droits de reproduction réservés  Copyright - all rights reserved
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale H

International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

---------------------- Page: 1 ----------------------
– 2 – 60728-9 Amend. 1  IEC:2005(E)
FOREWORD
This amendment has been prepared by technical area 5: Cable networks for television
signals, sound signals and interactive services of IEC technical committee 100: Audio, video
and multimedia systems and equipment.
The text of this amendment is based on the following documents:
FDIS Report on voting
100/947/FDIS 100/977/RVD

Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________

Amend the title of this standard on the cover page, the title page and on pages 3 and 6 as
follows:
Cable networks for television signals, sound signals and interactive services – Part 9:
Interfaces for CATV/SMATV headends and similar professional equipment for DVB/MPEG-2
transport streams
Page 2
CONTENTS
Rename the existing Annex F, Annex G.
Add the title of new Annex F as follows:
Annex F (informative) Guidelines for the implementation and usage of the DVB Asynchronous
Serial Interface (ASI)
Page 6
2 Normative references
Add the following new ETSI technical report:
ETR 290:1997, Digital Video Broadcasting (DVB); Measurement guidelines for DVB systems
Page 9

---------------------- Page: 2 ----------------------
60728-9 Amend. 1  IEC:2005(E) – 3 –
3.2 Abbreviations
Add the following new abbreviations:
LF low frequency
NTSC national television system committee
PAL phase alternation line
PCR program clock reference
RB receiver buffer
rx-clk receiver clock
TB transmission buffer
tx-clk transmission clock

Page 17
4.4 Asynchronous Serial Interface (ASI)
Replace the second paragraph by the following new text:
A detailed specification of ASI is provided in Annex B. Implementation guidelines and deriving
clocks from the MPEG-2 packets for ASI are provided in Annex E. Guidelines for the
implementation and usage of ASI are laid down in Annex F.
Page 47
Rename the existing Annex F, Annex G.
Add a new Annex F as follows:

---------------------- Page: 3 ----------------------
– 4 – 60728-9 Amend. 1  IEC:2005(E)
Annex F
(informative)

Guidelines for the implementation and usage of
the DVB Asynchronous Serial Interface


F.1 General
The DVB Asynchronous Serial Interface (ASI) is a very popular standard interface for
conveying MPEG-2 transport streams between professional equipment. However, there are
concerns over interoperability in the market place, based on system integrators’ experiences
with available equipment from multiple suppliers. This note is intended to explain some of the
causes of problems and to offer guidelines to ASI implementers that will encourage maximum
interoperability.
This annex addresses interoperability issues specific to ASI data transmission links, and
explicitly is not concerned with general MPEG-2 interoperability issues.
An example of an ASI interoperability problem is where equipment receiving an ASI data
stream occasionally drops out of lock, or never achieves lock at all.
An example of a problem not addressed by these guidelines is where the video and audio on
the output of a decoder have poor clock stability, because of PCR clock recovery problems at
some point in the end-to-end equipment chain, for example resulting in LF wander in a
regenerated PAL/NTSC subcarrier.
This annex contains a clause providing a description of the design issues confronting ASI
equipment designers (Clause F.2). This annex also contains a recommendation clause, which
provides simple measures to improve interoperability between ASI equipment. There may be
situations where systems will work outside these recommendations, depending on precise
system and equipment implementation.
F.2 ASI transmission links
The ASI is a uni-directional transmission link to transfer data between professional digital
vide
...