Cisco Cisco MGX-FRSM-HS2 B Serial Frame Service Module

Perform this task to loop an entire E3 line toward the line and back toward the router.

configure terminal

controller e3 slot/port

loopback {local | network {line | payload} }

Router> enable

Enables privileged EXEC mode. 

Enter the password if prompted.

 terminal

Router# configure terminal

Enters global configuration mode.

 slot/port

Router(config)# controller t3 1/0

Selects the T3 controller and enters controller configuration 
mode.

slot/port—Backplane slot number and port number on 
the controller.

 {local | network {line | payload} | 

}

Router(config-controller)# loopback local

Loops the T3 line toward the line and back toward the 
router.

local—Loops the data back toward the router and sends 
an AIS signal out toward the network.

network {line | payload}—Sets the loopback toward 
the network before going through the framer (line) or 
after going through the framer (payload).

Router(config-controller)# no loopback

Removes the loop.

Router(config-controller)# exit

Exits controller configuration mode and returns to 
privileged EXEC mode.