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Chapter 3 System Features
System Performance
3-74
255-700-447
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
GSM Voice Traffic Compression
The primary objective of GSM Idle Channel (No Speech Frame) Suppression
and GSM Idle Speech Frame Suppression is to minimize the number of GSM
voice traffic circuits between the cell sites (BTS) and the BSC. Suppressing
the idle traffic will allow for greater trunk utilization and greater operational
expense savings to wireless carriers. These features are supported on the
DSP2E (chips 5 and 6) and DSP2F modules using AlgoSet8. These GSM fea-
tures will be used either in conjunction with the existing wireless backhaul
features or on their own in a GSM-only configuration.
•
Idle Channel (No Speech Frame) suppression–A DS0 can be divided into a
64 Kbps channel, 32 Kbps channels, 16 Kbps channels or 8 Kbps channels.
When a channel is not allocated to a wireless call, No Speech Frames are
generated on those channels. With the PSAX Idle Channel (No Speech
Frame) suppression feature, the No Speech Frames will be detected and
suppressed from transmission on the backhaul trunk.
•
Idle Speech Frame suppression–Idle Speech Frames are generated during
periods of silence on calls. With the PSAX Idle Speech Frame suppression
feature, Idle Speech Frames will be detected and suppressed from transmis-
sion on the backhaul trunk. This will only be done for the 16 Kbps chan-
nels.
The actual savings realized with this feature will depend on the network
topology, the types of traffic on the network and the voice activity of the
users.
System Performance
Optimized Bootup
To support requirements to reduce the downtime of PSAX modules when
they are booted due to firmware upgrades that are provided with PSAX sys-
tem software upgrades, the Optimized Bootup feature is implemented for the
modules listed in the “Hardware Dependency” section for this feature. The
service interruption time on PVC and SPVC connections is now less than 30
seconds after driver download for these modules. If the number of configured
connections is more than the number stated, the bootup time might exceed
30 seconds.
The Optimized Bootup feature is supported on the following modules, in the
PSAX 1000, PSAX 1250, PSAX 2300, and PSAX 4500 systems:
23N74
3-Port DS3/E3 ATM
100 PVC and SPVC connections
configured (E3 mode only)
45N74
3-Port DS3/E3 ATM Protec-
tion
100 PVC and SPVC connections
configured (E3 mode only)