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SNA 4600
Standalone ARM Network Adaptor
Configuration
guide
Issued by Network Products Marketing Department
GSNA4600 - 09/1999
THOMSON broadcast systems - All rights reserved
p. 4 of 11
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.