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Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter 2 Illustrated Card List for MGX Switches and the MGX 8880 Media Gateway
Front Cards
Bit Error Rate Testing
After a service module line or port is put into loopback mode, the SRM can generate a test pattern over
the looped line or port, read the received looped data, and report on the error rate. This operation can be
performed on a complete T1 or E1 line, on a fractional T1 or E1 line, on a DS0 bundle (N x DS0), or on
a single DS0 channel.
The SRM can support BERT on only one line or channel at a time. BERT can generate a variety of test
patterns, including all ones, all zeros, alternate one zero, double alternate one zero, 2
23
-1, 2
20
-1, 2
15
-1,
2
11
-1, 2
9
-1, 1 in 8, 1 in 24, DDS1, DDS2, DDS3, DDS4, and DDS5.
Upgrading SRM-3T3 to SRME/B
The functionality of the SRME/B card is the same as the functionality of the SRM-3T3 card. Upgrading
a shelf containing SRM-3T3 cards to one containing SRME/B cards first involves a software upgrade to
1.3.00 (or later) for PXM1 and 5.0 (or later) for PXM1E and PXM45. After upgrading the firmware
image, you can replace the cards by either a graceful and non-graceful method.
Non-graceful Upgrade
A non-graceful upgrade involves removing one or both SRM-3T3 cards in a chassis bay and plugging in
the SRME/B card(s); where the SRM-3T3 configuration is retained. A non-graceful upgrade will cause
traffic outage during the upgrade time.
Graceful Upgrade
A graceful upgrade involves first replacing the standby SRM-3T3 card with an SRME/B card. After the
SRME/B card becomes standby, then you must perform a switchover using the switchcc command on
the standby card so that it takes over as active. After the card switchover, you can replace the current
standby SRM-3T3 card with the SRME/B card. This will cause traffic outage only during the switchover
time. Configuration changes are allowed when SRM-3T3 and SRME/B cards are paired and are working
in a co-exist mode.
Note If, prior to this upgrade, the SRM-3T3 cards were configured for line parameter options not supported
by the SRME/B card, the configuration options are restored to the default options supported by the
SRME/B card and a message is logged in the event log.