R2511-HP MSR Router Series Interface Command Reference(V5)

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Usage guidelines
Interframe filling tags are sent when no service data is sent on the timeslots bundled into logical channels
on a T1-F interface.
Do not use the ft1 itf type ff command if both the ft1 code ami command and the ft1 data-coding
inverted command are configured so that the T1-F interface can function normally.
Examples
# Set the interframe filling tag to 0xFF on T1-F interface Serial 2/0.
<Sysname> system-view
[Sysname] interface serial 2/0
[Sysname-Serial2/0] ft1 itf type ff
# Set the number of interframe filling tags to five on T1-F interface Serial 2/0.
<Sysname> system-view
[Sysname] interface serial 2/0
[Sysname-Serial2/0] ft1 itf number 5
ft1 loopback
Use ft1 loopback to set the T1-F interface in a loopback mode.
Use undo ft1 loopback to restore the default.
Syntax
ft1 loopback { local | payload | remote }
undo ft1 loopback
Default
Loopback is disabled.
Views
T1-F interface view
Default command level
2: System level
Parameters
local: Sets the interface in internal loopback mode.
payload: Sets the interface in external payload loopback mode.
remote: Sets the interface in external loopback mode.
Usage guidelines
Loopback is mainly used to check the condition of interfaces or cables. Disable loopback in other cases.
The three loopback modes cannot be used at the same time on a T1-F interface.
Examples
# Set T1-F interface Serial 2/0 in local loopback mode.
<Sysname> system-view
[Sysname] interface serial 2/0
[Sysname-Serial2/0] ft1 loopback local