Siemens S30810-Q2235-X VCM

Integrated Voice Compression at 16 Kbps allows up to 4 calls per channel simultaneously. Compressed voice connections can be switched to various destinations without decompressing and without loss of transmission quality.

In networks with S2M nailed connections, each S2 highway offers up to 30 B-channels, all of which can be used for compressed conmnections. At a compression factor of 1:4, this offers a theoretical maximum of 120 connections. In practise, up to 112 connections are possible.

Each VCM board (Q2235-X) can be used for compressing and decompressing voice connections on up to 15 channels. This means that 8 VCM boards are necessary to obtain the maximum number of compressed connections on one S2 highway. A separate VCM board variant (Q2235-X100) exists for S0 connections, which can serve up to 7 channels.

The compression/decompression of the voice channels is carried out by a new peripheral board type, the VCM. This board emulates a DIU-S2 board on the Hicom side.

The new board is assigned a separate trunk group for compressed voice connections. All connections routed through this board are compressed to 16 Kbps outgoing and decompressed to 64 Kbps incoming.

Since the VCM board emulates a DIU-S2, an appropriate signalling channel (D-channel) is also set up as the first modulated channel subset in a 64 Kbps timeslot. The signalling information is transmitted with the 16 Kbps HDLC protocol.

On the network side, the compressed connections are routed to a "real" DIU-S2 board or STMD board via a nailed connection, where they are "transparently" switched through to the appropriate S2 or S0 highway channel.

Product condition "Rebuilt"

This article is used and has been technically examined. It has, in its entirety, undergone extensive quality controls. We offer a one year warranty on this article. You can find more information on our restoration process here.

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• Telephone systems » Siemens » Boards

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