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210 CHAPTER 12: FUNDAMENTAL CE1/PRI INTERFACE CONFIGURATION COMMANDS
loopback (CE1/PRI interface view)
Syntax loopback { local | payload | remote }
undo loopback
View CE1/PRI interface view
Parameter local: Sets the interface in local loopback mode.
remote: Sets the interface in external loopback mode.
payload: Sets the interface in external payload loopback mode.
Description Use the
loopback command to enable loopback and set the loopback mode.
Use the undo loopback command to restore the default.
By default, loopback is disabled.
Loopback is intended for checking the condition of interfaces or cables. Disable it
otherwise.
You can bundle timeslots on the CE1/PRI interface to form a serial interface and
encapsulate it with PPP. After you enable loopback on this serial interface, it is
normal that the state of the link layer protocol is reported down.
Example # Set interface E1 2/0 in internal loopback mode.
<Sysname> system-view
[Sysname] controller e1 2/0
[Sysname-E1 2/0] loopback local
pri-set (CE1/PRI interface view)
Syntax pri-set [ timeslot-list list ]
undo pri-set
View CE1/PRI interface view
Parameter timeslot-list list: Specifies timeslots to be bundled. The list argument is timeslot
numbers, in the range of 1 to 31. You may specify a single timeslot by specifying a
number, a range of timeslots by specifying a range in the form of
number1-number2, or several discrete timeslots by specifying number1,
number2-number3.
Description Use the
pri-set command to bundle timeslots on the CE1/PRI interface into a PRI
set.