Chapter 3 System Features
PSAX System Software Features
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255-700-447
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Voice Compression
Voice compression over AAL2 works for any voice channel using A-Law or
µ-Law PCM. Non-multiplexed AAL2 sends one ATM cell every 5 seconds
when silence suppression is enabled. Standard AAL2 transmission provides a
triple redundancy every 5 seconds to protect against packet loss. In Release
8.0, the DSP2D Voice Server module sends silence suppression packets every
100 msec.
See the PacketStar PSAX DSP2x Voice Server Module User Guide for information
detailing the nine AlgoSets (algorithm sets) and the type of voice compres-
sion offered, if applicable.
V5.2 European IDLC
The PSAX system implementation of the V5.2 IDLC application offers loop
emulation services for PSTN and ISDN-PRI. The VoDSL oversubscription is
done on the local exchange end of the connection. The configuration of the
access network and the IAD supports the oversubscription. Silence suppres-
sion is supported per ITU-T I.366.2 to prevent the use of bandwidth for chan-
nels during silence intervals. Idle channel suppression is supported per ATM
Forum af-vtoa-0113 and af-vtoa-00085, to prevent the use of bandwidth for
channels that are idle.
The ATM virtual circuits through the ATM network between the CP-IWF and
the CO-IWF can be SVCs, PVCs, or SPVCs carrying:
Figure 3-19. Combining the UPC Feature and Either the TS or VI Feature on a
Connection
Chassis Backplane
VI or TS
Rx
Tx
Ingress Path
Egress Path
UPC
I/O Module 1
VI or TS
Rx
Tx
Ingress Path
Egress Path
UPC
I/O Module 2