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255-700-447
3-35
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Chapter 3 System Features
PSAX System Software Features
Restoring Service to the Working Module
After automatic or manual switchover has been performed and the replace-
ment or testing of the working module is completed, the user manually
switches the traffic back from the protection module to the working module,
which resumes Active mode. The following events occur depending on
whether the working module is an existing one having all configurations
loaded, or is a new module that replaces a failed working module.
•
Existing working module
When the user executes the switchover command (Command field on the
N to M Protection Configuration window, see Chapter 3 of the module user
guide), the PSAX system instructs the PSAX 24-Port RJ Protection Patch
Panel to switch control from the protection module running in Active
mode to the working module. The working module is then placed into
Active mode and the protection module is placed into Standby mode. The
patch panel LEDs indicate the working module is active.
•
Replacement working module
When the user inserts the new replacement module into the chassis, the
PSAX system recognizes it as an unconfigured module. The user then exe-
cutes the switchover command and the PSAX 24-Port RJ Protection Patch
Panel switches control from the protection module running in Active mode
to the working module. The working module is then placed into Active
mode and the protection module is placed into Standby mode.
The connection downtime (<250 ms) during this manual switchover in the
previous scenarios is only the amount of time needed to switch the
PSAX 24-Port RJ Protection Patch Panel from the protection connections to
the working connections.
APS/MSP Protection
on the Optical
Modules
The 1+1 Automatic Protection Switching (APS)/Multiplex Section Protection
(MSP) feature provides connection redundancy for traffic flow protection on
the PSAX optical I/O modules. These modules, which can be used in any
PSAX Multiservice Media Gateway chassis, include:
•
1-Port OC-3c 1+1 APS Multimode and Single-Mode modules
•
1-Port STM-1 1+1 MSP Multimode and Single-Mode modules
•
1-Port OC-12c/STM-4c Multimode and Single-Mode modules
These modules are used in pairs, installed in adjacent slots in the PSAX chas-
sis. In the event that the active module in the pair fails, the traffic is switched
to the standby module. The 1+1 protection implementation is compliant with
the GR-253-CORE standard and supports linear nonrevertive 1+1 protection,
in both bidirectional and unidirectional modes. Nonrevertive means that
connections that were switched from the active module to the standby mod-
ule are not automatically switched back to the active module after a failed
link becomes operational again. One advantage of nonrevertive switching is
minimal service interruption—one interruption instead of two.
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