Installation guide

SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
49 Revision: 2002-09-10
PRBS of length 2
15
-1 according to ITU-T O.151 (p = 0) or a PRBS of length 2
11
-1 according to ITU-
T O.152 (p = 1) towards the remote modem (dir = 0), towards the first user interface (dir = 1) or
towards the second user interface (dir = 2, Multiservice only).
Selecting dir = 3 will start an internal SHDSL bit error rate test which is completely independent
from any user interface and configuration. Make sure that the link is running before starting the
internal BER test. Also, if the SHDSL link fails during the internal BER test, the test must be
restarted after the link has been re-established.
When no parameter is specified, the default values are m = 24 hours, dir = 0 and p = 0.
Before starting a BER test with dir = 0, a loopback should be established at the SHDSL side
(analog loopback, regenerator loopback or remote loopback 2).
To test also the user interface of the remote equipment, a hardware loopback at the remote user
interface (connection of transmit and receive signals) is possible too.
The test will be stopped automatically after m minutes; a manual stop is possible with the
STOPBER command. The results of the BER test can be displayed by the READBER command.
LTU_01_PM>STARTBER 3
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BER Test Results Test running
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Test direction : SHDSL
Test interval : 180
Test pattern : 2^15-1
Test bit rate : 1984000
Bit errors : 0
Bit error rate : 0.00E+00
Sync loss seconds : 0
Elapsed seconds : 6
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
LTU_01_PM>
7.3.2.4 STOPBER Command
A BER test can be manually terminated by this command.
LTU_01_PM> STOPBER
29:01:30 BER test stopped
LTU_01_PM>
7.3.2.5 READBER Command
The results of a BER test can be displayed using this command. When a test is running, the
current results are displayed, when no test is running, the results of the last BER test are
displayed.
LTU_01_PM> READBER
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BER Test Results Test completed
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Test direction : SHDSL
Test interval : 180
Test pattern : 2^15-1
Test bit rate : 1984000
Bit errors : 0
Bit error rate : 0.00E+00
Sync loss seconds : 0