Technicolor - Thomson BP 8244 User Manual

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SNA 4600

Standalone ATM Network Adaptor

Configuration guide

A self-contained system for dial-up wide area networking

of professional quality TV and broadband data …

THOMSON broadcast system reserves the right to change product characteristics
without prior notice.
This document and any updates and/or supplemental information, including any copies
thereof, cannot be reproduced, neither communicated to a third party, without written

© 1999
THOMSON
broadcast systems

Product overview

AAL1 or AAL5

ATM

cell mapping

ASI / PSI(LVDS) or G 703 Serial

MPEG-2 TS or G 703 Data

Streams

34Mb/s, 45 Mb/s, 140 Mb/s PDH or 155 Mb/s SDH

E3, DS3, E4 or STM1G 703

Electr

.

or STM1 MM-FO

or STM1 G957 SM-FO

Tributaries

Interfaces

ATM

Adaptation

ATM

Mux/Demux

Network

Interfaces

SNA 4600
Standalone ARM Network Adaptor

Key features:

Ä A unique network interfaces family

Configuration
guide

SNA 4600 performs the processing of

Ä Self-contained system

MPEG-2 DVB Transport Stream and
other data services for transmission
on PDH/SDH networks under ATM
layering. It is a self-contained system,
perfectly suited for

Ä Powerful ATM multiplexing
Ä Multiple service capability
Ä Dial-up connection capability

broadcasters’ needs

Ä Full duplex transmission
Ä ATM Adaptation Layers type 1 and

type 5 for real time services

Ä Local and remote control capability
Ä DVB, ITU-T and ATM Forum

standards compliant

The SNA 4600 Standalone Network Adaptor connects costumer’s TV equipment to leased lines,
to PDH and to SDH networks but also to ATM networks enabling dial-up transfer of professional
TV at user-selected quality. Allowing processing of other data streams, it features a versatile
multiple service communication network interface.

The SNA 4600 supports serial or parallel MPEG-2 TS, as well as G703 2, 8, 34 or 45 Mbps data
stream tributaries. AAL1 or AAL5 layering may be chosen depending on customer needs and
requested Quality of Service.

The ATM multiplexed services are inserted into a single PDH stream (E3, DS3 or E4) or into an
SDH VC4 virtual container. The SDH output can be configured with either electrical or optical
interfaces.

It is designed as a 3 RU-19", self-contained sub-rack unit. It can be populated with up to 8 boards,
by combining MPEG TS or data streams tributary ATX and ARX cards, and up to two User
Network Interfaces (UNI) boards.

It can be controlled and monitored either from the front panel keypad and illuminated LC Display,
or remotely from the DBE 2930 proprietary manager system through an RS 485 linked DBE 2910
Mediation Unit.

Issued by Network Products Marketing Department
GSNA4600 - 09/1999
 THOMSON broadcast systems - All rights reserved

SNA 4600 Functional Block Diagram

p. 2 of 11

SNA 4600
Standalone ARM Network Adaptor

Configuration
guide

Benefits

A unique network interfaces family

Together with the TNA 4600 and CNA 4600 systems, the SNA 4600 forms a unique family of
network interfaces which addresses the variety of needs in network design and throughput, for
single service as well as multiple services architecture.

Self-contained system solution

In one modular compact product, the SNA 4600 offers a comprehensive range of digital video and
data communications services, provides full ATM multiplexing and network single or dual
termination functionality. With the self-contained design of the SNA 4600 system, the Operators
enjoy the benefits of full compatibility between all functions, integrated management and
simplification of configuration and maintenance operations.

Powerful ATM multiplexing

With up to 7 transport stream multiplexing capability within a 3 RU- 19" chassis, the SNA 4600 is
a powerful system, which saves headroom in operational centers (or hubs) for additional
equipment.

Multiple service capability

In addition to its powerful capability MPEG-2 Transport Stream multiplexing, the SNA 4600 offers
through its circuit emulator the capability to mix other digital services in the same telecom network
channel, thus ensuring efficient data transfer and gives the operators the flexibility to adjust the
network communications according to market needs.

Dial-up connection capability (option

The service end-user selects the far-end party and the call parameters by dialling. Connections
are automatically established, performing ATM User-to-Network Interface signalling.

Full Duplex transmission

Thanks to its full duplex transmission capability the CNA 4600 series features universal interfaces
for contribution network interface for MPEG-2 transport whatever the User-to-Network Interface is
(PDH, SDH or leased lines).

ATM Adaptation Layers type 1 and type 5 for real time services

When type 1 Forward Error Correction, Reed Solomon and interleaving can be used to enhance
the residual bit error rate, AAL type 5 can be selected to allow interoperability with AAL type 5 only
based equipment (servers…).

Local or remote control capability

All SNA 4600 components can be controlled and monitored either locally through the menu-driven
illuminated LC Display and front panel keypad which provides monitoring facilities as well as
control of selected parameters.
It can also be remotely managed by the DBS 2930 integrated system manager through an RS 485
bus link which provides a Graphical User Interface for configuration, status and fault monitoring.

DVB, ITU and ATM Forum standards compliant

SNA 4600 strict adherence to DVB and ATM standards ensures interoperability with any other
standard-based equipment.

Issued by Network Products Marketing Department
GSNA4600 - 09/1999
 THOMSON broadcast systems - All rights reserved

p. 3 of 11

SNA 4600
Standalone ARM Network Adaptor

Configuration
guide

Features and Capabilities

SNA 4600 Interfaces capability

Tributaries Interfaces capability

Tributary Interfaces are available for:

- Serial DVB-ASI or parallel DVB-SPI formats, in compliance with prEN50083-9 standard, from
2 to 60 Mb/s.

- 2, 8, 34 or 45 Mb/s Data Streams as G703 formatted data tributaries.

Network Interfaces capability

User Network Interfaces are available for:

- PDH Electrical interfaces: 34 Mb/s (E3); 45 Mb/s (DS3); 140 Mb/s (E4)

- SDH Electrical interfaces: 155 Mb/s (STM1 and STS3c - on request)

- SDH Optical interfaces: 155 Mb/s (STM1 and STS3c – on request) Single-Mode or Multi-

Mode Fiber

MPEG-2 TS Processing

The 3 MPEG2-TS packet formats, as defined by DVB, are supported.
The “flying wheel” synchronisation mechanism is in accordance with ETS300813 and ETS 300814
standards; if synchronisation is lost no packet is transmitted.

Circuit Emulation Processing

The Circuit Emulation provides an AAL1 adaptation layer with an interleaved Reed-Solomon
forward error correction mechanism.
Full AIS detection and generation, is propagated thereby enabling clock holdover in event of
signal loss.

ATM Adaptation

ATM multiplexing performs the asynchronous multiplexing of incoming MPEG-2 stream to form a
flow of ATM useful cells. ATM demultiplexing performs the reciprocal function on the basis of VPI
(Virtual Path Identifier) and VCI (Virtual Channel Identifier) filtering.
For G703 Data Stream Tributaries only the ATM Adaptation Layer-1 (AAL1) is available.

ATM Cell Mapping

ATM multiplexing performs the asynchronous multiplexing of the individual tributary data to form a
flow of ATM cells. ATM demultiplexing performs the reverse function on the basis of VPI (Virtual
Path Identifier) and VCI (Virtual Channel Identifier) filtering.
Both functions are simultaneously available.

Dialling (option)

The SNA 4600 offers on-demand connections over a B-ISDN systems. The signalling protocol
supported conforms to the ATM Forum UNI 3.1 protocol.
The ATM multiplexer allows for 7 access points for on-demand connections (Virtual Ports). Each
tributary board can be linked to these Virtual Ports.
Three kinds of connections can be set up: one way point-to-point, one way point-to multipoint and
two way (point-to-point) connections.
In the point-to-multipoint mode, up to 7 remote users can be connected simultaneously.
As specified by the UNI3.1 protocol, the point-to-multipoint connection can be established only by
the sender.

Issued by Network Products Marketing Department
GSNA4600 - 09/1999
 THOMSON broadcast systems - All rights reserved

p. 4 of 11