Cisco Systems MGX 8230 Configure Loopback on All DS1s in a DS3 Line, Receive a Loopback Request

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Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Chapter6 Card and Service Configuration DS3 Loopback Test
Configure Loopback on All DS1s in a DS3 Line
To verify that the loopback can be configured on all the DS1s of the DS3 line:
Step 1 Select a node with PXM-T3 back c ar d.
Step 2 Configure the line using cnfln -felpbnum 29.
Step 3 Check that dsplog does not show any errors or alarms log ged.
Step 4 Using dspln, check that FarEndLoopbkLineNum has been configured to be ds1 lineall.
Pass Criteria:
•No errors logged on the console or the log due to configuring loopback on all DS1 lines of PXM-T3.
•Configured loopback can be displayed using dspln.
Receive a Loopback Request
To verify that DS3 interface can be put into loopback:
Step 1 Select a node with PXM-T3 back c ar d.
Step 2 Make sure that the FEAC code validation criteria on the DS3 interface is not disabled using dspln -ds3
<slot>.<port>.
Step 3 Configure the HP cerjac tester t o s en d a p at ter n to t he D S 3 in ter face of the node.
Step 4 Any pattern sent will cause the interface to put itself into loopback and the interface retransm its the same
pattern back to the tester.
Step 5 From the tester, verify that the same i s r ece ived b ack o n th e test er, th us valid at in g th e l oo p ba ck o n t h e
DS3 interface.
Step 6 Check that dsplog does not show any errors or alarms log ged.
Pass Criteria:
•The pattern sent by the tester is r ec eived back to the tester as is.
•No errors logged on the console or the log.
Retransmit Pattern
Loopback Activation Code
MGX 8230 Switch
with T3 Interface
DTA Tester
(Digital
Transmission
Analyzer)
46090