Qlink-3000 Multiplexing modem
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Copyright © 2003 -2005 Cronyx Engineering
26
3.5. Built-in BER tester
The Qlink-3000 multiplexing modem has a built-in BER tester, which allows to perform
error rate measurements in the SHDSL link. The measurements are performed using
fixed or pseudo-random code according to the O.151 recommendation (the pattern length
is 2
15
-1=32767 bits). The BER tester is controlled from the console (see the “Test”
menu” section) or via an additional Ethernet port using the SNMP protocol. If remote
control is allowed, then the BER tester may be controlled from a terminal connected to
the console port of the remote device.
The BER tester may be enabled on the full useful bandwidth, or on the tributary of each
port.
In order to test the link, it is recommended to enable loop on the remote device before
enabling the BER tester. This may be performed using the “Link Remote Loop” command
on the console of the local device or using the “Link Loop” on the console of the remote
device.
Example of enabling the BER tester on the full bandwidth on the local device:
Local device: link remote loop,
BER-tester enabled over
full payload
Remote device: local loop enabled
after remote request
Port 0
(E1)
Port 1
(ETH)
Port 0
(E1)
Port 1
(ETH)
AIS
BERT
AIS
