Command Reference Guide

3Com Router 5000 Family and Router 6000 Family loopback ● 243
Command Reference
loopback
Purpose Use the loopback command to configure the loopback mode on the ATM E1/T1
interface.
Use the undo loopback command to disable loopback.
Syntax loopback { cell | local | remote | payload }
undo loopback
Parameters cell
Internal cell loopback for checking that the local
physical chip is operating.
local
Internal loopback for checking that the local service
chip is operating.
remote
External line loopback for checking that the remote
end is normal.
payload
External payload loopback for checking that payload
framing is normal.
Default By default, loopback is disabled.
Example Enable payload loopback on ATM E1/T1 interface 1/0/2.
<3Com > system-view
[3Com ] interface atm 1/0/2
[3Com -Atm1/0/2] loopback payload
View This command can be used in the following views:
■ ATM E1/T1 Interface view