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Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004
Chapter 9 Switch Operating Procedures
Managing Bit Error Rate Tests
In the following example, the user enables a BERT on line 1 in port 0 on the service module in slot 25.
The BERT pattern is set to 1 (all zeros), and loopback is set to 14.
Unknown.7.PXM.a >
cnfbert
-cbif 25.1.0 -pat 1 -lpbk 14 -en 6
Step 5
After the BERT has been running for at least 30 minutes, enter the dspbert <bay> command to display
the BERT result. Replace bay with 0 to indicate the upper bay, or 1 to indicate the lower bay.
Note
For the PXM1E, the bay will always be 2 because BERT is only run on the lower bay. BERT is
supported on both bays for AXSM cards.
Note
The dspbert command can be issued even while the BERT is in operation.
Unknown.7.PXM.a >
dspbert
2
Replace bay with 1 to indicate the lower bay.
Unknown.7.PXM.a >
dspbert
2
Start Date : 08/29/2002
Current Date : 08/29/2002
Start Time : 18:43:07
Current Time : 16:56:23
Physical Slot Number : 22
Logical Slot Number : 22
Line Number : 1 (Line test)
Device To Loop : Local Loopback
BERT Pattern : Double One Zero Pattern
Error Inject Count : 0
Bit Count : 3091031099
Bit Count Received : 3091031099
Bit Error Count : 0
Bit Error Rate (BER) : 0
Bit Counter Overflowed : 6 <times>
BERT is in sync.
singleBitErrInsert
Different options of error insertion rates, where singleBitErrInsert is
“1” (noError), or “| 2" (insert).
Note
Injection of bit error should be done after configuring BERT
dropIteration
where dropIteration is between 1 and 32, used only
if loopback is 5:latchDS0Drop.
enable
Enables/disables BERT. Enter “4” to enable BERT or “6” to disable
BERT.
Table 9-34 cnfbert Command Parameters
