Starting/Stopping A Bert Test On T1-F Interface - 3Com MSR 50 Series Configuration Manual

118 C 4: WAN I
HAPTER NTERFACE
Starting/Stopping a
BERT Test on T1-F
Interface
C
ONFIGURATION
To do...
Set the behavior of the
interface on the FDL in ESF
framing
Set the CRC mode
Set the frame format
Set alarm thresholds
Set the type of line idle code
Set the type of interframe
filling tag
Set the number of interframe
filling tags
Set the loopback mode
Send remote control loopback
code
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.
Use the command...
ft1 fdl { ansi | att | both |
none }
crc { 16 | 32 | none }
ft1 frame-format { esf | sf }
ft1 alarm-threshold los
pulse-detection value
ft1 alarm-threshold los
pulse-recovery value
ft1 alarm-threshold ais
{ level-1 | level-2 }
ft1 alarm-threshold lfa
{ level-1 | level-2 | level-3 |
level-4 }
ft1 idlecode { 7e | ff }
ft1 itf type { 7e | ff }
ft1 itf number number
ft1 loopback { local |
remote | payload }
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 }
Remarks
Optional
FDL is disabled by default.
Optional
16-bit CRC by default.
Optional
The default is esf.
Optional
For LOS alarm
The threshold of
pulse-detection defaults to
176 and the threshold of
pulse-recovery defaults to 22.
That is, if the number of the
pulses detected during the
total length of 176 pulse
detection intervals is smaller
than 22, the pulse-recovery
threshold, a LOS alarm occurs.
Both AIS alarm threshold and
LFA alarm threshold default to
level-1.
Optional
The default is 0x7E.
Optional
The default is 0x7E.
Optional
The default is 4.
Optional
Loopback is disabled by
default.
Optional
No remote control code is
sent by default.