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Page 28 - Voice Compression Networking (VCC)
Voice Compression Networking (VCC)
The VCC Groups and Cassette Set up
Page 28 - Networking
38DHB0002UKDJ – Issue 3 (12/00)
The INDeX Voice Compression Cassette (VCC) provides two key functions for calls
to a remote INDeX that also has a VCC cassette:
– It allows up to 7 simultaneous calls on a single B-channel.
– It enables DPNSS networking features including integrated networking
across non-DPNSS connections.
VCC is supported on BRI T, Euro ISDN, DASS II and DPNSS trunks. The trunk
interfaces at each switch must be using the same digital protocols, i.e.: DPNSS to
DPNSS, DASS II to DASS II, Euro ISDN or BRI T to Euro ISDN or BRI T.
The PSTN provider must support and enable the use of 'called party
sub-addressing' for which they may charge.
The different VCC cassette variants can only route 8, 16 or 28 calls (shown as
VCCx on the cassette's label). Any further calls are routed as single uncompressed
calls if trunks are available. Those uncompressed calls do not have access to the
DPNSS networking features.
The VCC cassette does not support:
– Modem or data calls.
– PSTN routing on satellite connections.
– PSTN routing where the PSTN provider also applies compression.
VCC cassettes prior to PCS 1.4 do not support fax calls and are limited to one VCC
cassette per system. PCS 1.4+ VCC cassettes support fax at up to 4800 bits per
second and have no limitation on the number of VCC cassettes.
VCC calls are routed in the same way as VPN calls but do not require entry of the
VPN Access licence key.
The INDeX maintains two groups for 'virtual trunks' created by the presence of VCC
cassettes. The groups (the VCC Input Group and VCC Output Group) are
maintained automatically by the INDeX and should not be altered.
For the VCC 28, the number of calls routed into the cassette plus the number of
output B-channels from the cassette cannot exceed 32. The maximum number of
output channels that the VCC 28 can provide is set by the Output channels option
(Linecard information > Linecard > Set up).
IMPORTANT
Networking
Programming Manual
INDeX 9.1
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