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PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Chapter 3 System Features
PSAX System Software Features
Application
A pair of PSAX systems, acting as an originating node and a terminating
node, cooperatively accomplish the networkwide rerouting regardless of the
number of connections affected by the network outage. The PSAX system
can switch traffic on a primary connection to a standby connection within
one second, avoiding service interruptions under reasonably likely network
congestion conditions. The automatic rerouting of traffic from a primary con-
nection to a standby connection is shown in Figure 3-8.
Firmware Release Control
The PSAX CPUn module has access to the firmware binaries of all modules
present in the PSAX system. The firmware is downloaded into the random
access memory (RAM), into the secondary FLASH of each module, through a
dedicated communication channel.
The firmware download is performed under the control of two interworking
functions (IWFs) resident in the PSAX CPUn module, and in the I/O or server
module, respectively. Once the binaries are downloaded, the modules exe-
cute the downloaded code that controls the module.
You do not need to download an I/O or server module’s firmware separately
from the PSAX system software upgrade. When the PSAX system software is
upgraded using the SRD Download Configuration window (see Chapter 13),
the system reboots and all firmware of the I/O and server modules (in the
rebooted chassis) is also upgraded.
You can use the firmware upgrade procedure in Chapter 13 to revert to an
older firmware release if a module is not working properly with its current
firmware.
Figure 3-8. Automatic Traffic Rerouting using Dual-Homed PVCs
Multiservice
Media
Gateway
Primary PVC
Standby PVC
Primary PVC
Standby PVC
ATM Network
Interrupted
Link failure
service
Continued
service
Multiservice
Media
Gateway
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