HP MSR2000/3000/4000 Router Series Interface Command Reference

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Parameters
local: Enables the CT1/PRI interface to perform local loopback.
payload: Enables the interface to perform external payload loopback.
remote: Enables the interface to perform remote loopback.
Usage guidelines
Loopback is mainly used to check the condition of interfaces or cables. Disable loopback in other cases.
You can bundle timeslots on a CT1/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.
Examples
# Enable local loopback on interface T1 2/0.
<Sysname> system-view
[Sysname] controller t1 2/0
[Sysname-T1 2/0] loopback local
pri-set (CT1/PRI interface)
Use pri-set to bundle timeslots into a PRI set on the CT1/PRI interface.
Use undo pri-set to remove the timeslot bundle.
Syntax
pri-set [ timeslot-list list ]
undo pri-set
Default
No PRI set is created.
Views
CT1/PRI interface view
Predefined user roles
network-admin
Parameters
timeslot-list list: Specifies timeslots to be bundled. Timeslots are numbered 1 through 24. You can 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.
Usage guidelines
When you create a PRI set on a CT1/PRI interface, timeslot 24 is the D channel for transmitting signaling,
and it cannot form a bundle that includes itself only. The attempts to bundle only timeslot 24 will fail.
In the created PRI set, timeslot 24 is used as D channel for signaling transmission, and the other timeslots
as B channels for data transmission. You can randomly bundle these timeslots into a PRI set (as the D
channel, timeslot 24 is automatically bundled). If no timeslot is specified, all timeslots are bundled into
an interface similar to an ISDN PRI interface in the form of 23B+D.