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

Chapter 6 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 card.

Step 2 Configure the line using cnfln -felpbnum 29.

Step 3 Check that dsplog does not show any errors or alarms logged.

Step 4 Using dspln, check that FarEndLoopbkLineNum has been configured to be ds1lineall. 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:

			DTA Tester
MGX 8230 Switch	Loopback Activation Code
			(Digital
with T3 Interface			Transmission
		Retransmit Pattern
			Analyzer)

46090

Step 1 Select a node with PXM-T3 back card.

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 to send a pattern to the DS3 interface of the node.

Step 4 Any pattern sent will cause the interface to put itself into loopback and the interface retransmits the same pattern back to the tester.

Step 5 From the tester, verify that the same is received back on the tester, thus validating the loopback on the DS3 interface.

Step 6 Check that dsplog does not show any errors or alarms logged.

Pass Criteria:

•The pattern sent by the tester is received back to the tester as is.

•No errors logged on the console or the log.

	Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001		6-59