R3102-R3103-HP 6600/HSR6600 Routers Interface Configuration Guide

37
Ste
p
Command Remarks
16. Set the number of interframe
filling tags.
ft1 itf number number
Optional.
The default is 4.
17. Enable loopback and set the
loopback mode.
ft1 loopback { local | remote |
payload }
Optional.
Loopback is disabled by default.
18. Send remote control loopback
code.
ft1 sendloopcode
{ fdl-ansi-llb-down | fdl-ansi-llb-up
| fdl-ansi-plb-down |
fdl-ansi-plb-up | fdl-att-plb-down
| fdl-att-plb-up | inband-llb-down
| inband-llb-up }
Optional.
No remote control code is sent by
default.
19. Set the intended bandwidth
for the T1-F interface.
bandwidth bandwidth-value Optional.
20. Restore the default settings for
the T1-F interface.
default Optional.
21. Shut down the T1-F interface.
shutdown
Optional.
A T1-F interface is up by default.
Starting/terminating a BERT test on a T1-F interface
BERT is operating as follows:
The local end sends out a pattern, which is to be looped over somewhere on the line and back to the
local end. The local end then checks the received pattern for the bit error rate, and by so doing helps you
determine whether the condition of the line is good. To this end, you must configure loopback to allow
the transmitted pattern to loop back from somewhere on the line, for example, from the far-end interface
by placing the interface in far-end loopback.
You may view the state and result of the BERT test with the display ft1 serial command.
To start/terminate a BERT test on a T1-F interface:
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Enter T1-F interface view.
interface serial interface-number N/A
3. Start a BERT test.
ft1 bert pattern { 2^20 | 2^15 }
time minutes [ unframed ]
By default, no BERT test is
performed.
Configuring error packets diffusion restraint
Error packets diffusion occurs when the error packet received on one timeslot spreads to other timeslots.
You can suppress error packet diffusion by configuring three parameters: detection period (detect-timer),
renew-timer (renew-timer), and PER threshold (threshold).
If the packet error rate for the detection period exceeds the PER threshold, the interface automatically
shuts down to avoid the risk of error packets diffusion. At the same time, the renew timer starts. When the
timer expires, the interface automatically comes up.