Starting/Stopping A Bert Test On Ct1/Pri Interface - 3Com MSR 50 Series Configuration Manual

Starting/Stopping a
BERT Test on CT1/PRI
Interface
To do...
Set alarm thresholds
Set the behavior of the
interface on the FDL in ESF
framing
Enable loopback
Send remote control loopback
code
Quit to system view
Enter synchronous serial
interface view of an interface
formed by a CT1/PRI interface
Set the CRC mode
Note:
1. B8ZS = Bipolar 8-zero substitution; 2. ESF = Extended super frame; 3. LOS = Loss of signal;
4. AIS = Alarm indication signal; 5. LFA = Loss of frame align
Bit error rate test (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 controller t1
command.
Use the command...
alarm-threshold los
pulse-detection value
alarm-threshold los
pulse-recovery value
alarm-threshold ais {level-1|
level-2}
alarm-threshold lfa { level-1
| level-2 | level-3 | level-4 }
fdl { ansi | att | both | none } Optional
loopback { local | remote |
payload }
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 }
quit
interface serial
interface-number:set-number
or
interface serial
interface-number:23
crc { 16 | 32 | none }
CT1/PRI Interface 113
Remarks
Optional
3
1 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.
4
1 Both AIS alarm threshold
and LFA 5 alarm threshold
default to level-1.
The default is none, meaning
that FDL is forbidden.
Optional
Disabled by default.
Optional
No remote control code is
sent by default.
-
Required
Optional
By default, 16-bit CRC is
adopted.