3Com 3031 Command Reference Manual page 208

208 C 3: I M C
HAPTER NTERFACE ANAGEMENT OMMANDS
Example
Configure ATM E3 interface 1/0/0 to use frame format G.832 ADM.
<3com> system-view
[3com] interface atm 1/0/0
[3com-Atm1/0/0] frame-format g832-adm
loopback Syntax
loopback { cell | local | payload | remote }
undo loopback
View
ATM E3/T3 interface view
Parameter
cell: Internal cell loopback
local: Internal loopback.
payload: External payload loopback.
remote: External line loopback.
Description
Using the loopback command, you can enable the loopback function of the
interface. Using the undo loopback command, you can disable the loopback
function.
By default, loopback is disabled.
Example
Enable external payload loopback of ATM E3/T3 interface 2/0/0.
<3com> system-view
[3com] interface atm 2/0/0
[3com-Atm2/0/0] loopback payload
scramble Syntax
scramble
undo scramble
View
ATM E3/T3 interface view