TIA/EIA/IS-787:1999

$22.75

Common ATM Satellite Interface Interoperability Specification (CASI)

Published By	Publication Date	Number of Pages
TIA	1999	15

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Category: TIA

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Description

Introduction

Asynchronous Transfer Mode (ATM) technology was originally
developed for the high-speed and low Bit Error Rate(BER)
environment. As ATM technology was deployed, interest in using ATM
over satellite links has emerged. However, satellite Links have
characteristics different from the environment for which ATM was
designed. There are various alternatives for transporting ATM cells
over satellite links. Typically, to select a specific transport
mechanism, end-users, service providers, or network designers have
to consider the performance impacts, bandwidth utilization, power
requirements, operations and reliability aspects. For example, to
improve the physical layer performance, and hence the performance
of higher layers of the ATM stack, a user may employ a powerful FEC
mechanism at the satellite modem. Conversely, another user may
choose to employ some other network solution that combines more
efficient power and bandwidth techniques. This document addresses
the latter solution as it introduces a network device that provides
powerful, dynamic FEC and data compression techniques for better
bandwidth utilization. This CASI provides the specifications for
implementing a network device between the terrestrial ATM network
interface and a conventional satellite modem. This CASI will allow
interoperability among different vendor equipment that provides the
features that are described in this document.

There are various standards for ATM that have been developed by
the ATM Forum (ATM-F) and the International Telecommunication Union
(ITIJ). In particular, the ATM Forum has developed the "Traffic
Management Specification (TM 4.0). The TM specification contains
sections on ATM service architecture, Quality of Service, Traffic
Contract, and procedures for traffic management. On the other hand,
the ITU-Telecommunication Sector has developed a series of
recommendations on ATM that deal with reference architectures,
congestion control, network interfaces, performance, operations and
maintenance principles, etc. Two recommendations that deal with
network performance and architecture issues are ITU-T
Recommendation 1.356 "B-ISDN ATM Layer Cell Transfer Performance"
and ITU-R Recommendation S.{Doc.4/44] ("Performance for B-ISDN ATM
via Satellite"). As noted previously, this document describes a
CASI for interconnecting terrestrial ATM network elements to
conventional satellite modems.