HP MSR2000/3000/4000 Router Series Interface Configuration Guide

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Starting/terminating a BERT test on a CT1/PRI interface
Bit error rate test (BERT) operates 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 can view the state and result of the BERT test with the display controller t1 command.
To start/terminate a BERT test on a CT1/PRI interface:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter CT1/PRI interface view.
controller t1 number N/A
3. Start a BERT test.
bert pattern { 2^20 | 2^15 } time
minutes [ unframed ]
By default, no BERT test is
performed.
Displaying and maintaining CT1/PRI interfaces
Execute display commands in any view and reset commands in user view.
Task Command
Display the status of a CT1/PRI interface. display controller t1 [ interface-number ]
Display the status of a channel set or PRI set. display interface serial interface-number:set-number
Clear the controller counter for a CE1/PRI
interface.
reset counters controller t1 [ interface-number ]
Configuring an E1-F interface
Overview
E1-F interfaces, which are fractional E1 interfaces, are simplified CE1/PRI interfaces. They are a
cost-effective alternative to CE1/PRI interfaces where E1 access does not need multiple channel sets or
ISDN PRI.
Compared with a CE1/PRI interface, an E1-F interface delivers these features:
• In framed mode, it can only bind timeslots into one channel set, but a CE1/PRI interface can group
and bundle timeslots randomly into multiple channel sets.
• It does not support PRI mode.
An E1-F interface can operate in either framed (the default) or unframed mode.