R0106-HP MSR Router Series Interface Command Reference(V7)

95
7e: Specifies the interframe filling tag type 0x7E.
ff: Specifies the interframe filling tag type 0xFF.
Usage guidelines
Interframe filling tags are sent when no service data is sent on the timeslots that are bundled into logical
channels on the CE1/PRI interface.
If the 0xFF interframe filling tag is used on a CE1/PRI interface in E1 mode, consecutive ones sent when
the line is idle might trigger AIS alarms. To prevent false AIS alarms, HP recommends that you use the
undo detect-ais command to disable AIS test.
Examples
# Set the type of interframe filling tag to 0xFF on E1 2/3/0.
<Sysname> system-view
[Sysname] controller e1 2/3/0
[Sysname-E1 2/3/0] itf type ff
# Set the number of interframe filling tags to 5 on E1 2/3/0.
<Sysname> system-view
[Sysname] controller e1 2/3/0
[Sysname-E1 2/3/0] itf number 5
loopback (CE1/PRI interface)
Use loopback to enable loopback and set the loopback mode.
Use undo loopback to restore the default.
Syntax
loopback { local | payload | remote }
undo loopback
Default
Loopback is disabled.
Views
CE1/PRI interface view
Predefined user roles
network-admin
Parameters
local: Sets the interface to operate in local loopback mode.
payload: Sets the interface to operate in external payload loopback mode.
remote: Sets the interface to operate in external loopback mode.
Usage guidelines
Loopback is intended for testing only. Disable the feature when the interface is operating correctly.
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 as down.