Cisco Systems A9014CFD manual Troubleshooting Controllers, Troubleshooting E1 Controllers, 20-5

Chapter 20 Configuring T1/E1 Controllers

Troubleshooting Controllers

	Command	Purpose
Step 7
	Router(config-controller)#	Configures the cable length.
	cablelength {long [-15db -22.5db
	-7.5db 0db] short [110ft
	220ft 330ft 440ft 550ft
	600ft]}
Step 8
	Router(config-controller)# exit	Exits controller configuration mode.
Step 9
	Router(config)# interface serial	Configures the serial interface. Specify the T1 slot (always 0), port
	slot/port:channel	number, and channel-group.
Step 10
	Router(config-if)# encapsulation	Enters the following command to configure PPP encapsulation.
	ppp
Step 11
	Router(config-if)# keepalive	Enables keepalive packets on the interface and specify the number of
	[period [retries]]	times that keepalive packets will be sent without a response the interface
		is brought down:
Step 12
	exit	Exits configuration mode.
	Example:
	Router(config)# exit
	Router#

Troubleshooting Controllers

This line card supports local and network T1/E1 loopback modes, and remote T1 loopback modes for testing, network fault isolation, and agency compliance. You can test T1/E1 lines in local and network loopback modes. You can also test T1 lines in remote mode.

Note The ASR901 supports activating or deactivating payload and line loopback modes using FDL in ESF framing mode as defined in the T1.403 ANSI standard. The implementation confirms to ANSI T1.403-1999, sections 9.4.2.1 and 9.4.2.2. The ASR901 only accepts remotely initiated loopback requests and does not support initiation of FDL remote loopback requests.

Note Bit-error-rate testing and loopbacks are used to resolve problems and test the quality of T1/E1 links.

Troubleshooting E1 Controllers

To troubleshoot the E1 line card, complete the following steps in the controller configuration mode:

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		20-5