METRODATA LTD
WCM1100 / WCM3100 / WCM-Serial
User Manual
76-02-082 Rev J
135 of 140
5.9.2 Test Pattern
The Test pattern generator is only available for E1, E3 or DS-3 WAN ports and is not
available on the serial port.
The Test pattern generator allows a BERT test to be performed on the WAN interface.
When the Test pattern is enabled, the WAN port is disconnected from the LAN traffic as
the BERT pattern will overwrite the payload.
Typically a bert test is performed with a loopback applied at a remote point in the network.
The WCM unit supports request of a loop at the remote WCM, however for fault diagnosis
intermediate node loops may be required. With intermediate node loops, it is vital to
ensure that the Test pattern is enabled before the external loop is applied otherwise LAN
traffic may be looped. Possible loopback positions are shown below:
When performing a BERT test of the WAN circuit, the initial stage should be to issue the
RL command to the remote WCM unit to perform an end to end test on the line. If this
fails, then contact the network operator to have loopbacks applied to the intermediate
nodes to prove the circuit in segments.
The WAN test pattern menu is as shown below:
Metrodata WCM3100 "" Alarms: Major
TEST PATTERN, WAN
State Disabled
Pattern 2^15-1 (O.151)
pOlarity Inverted
Results <display>
First CAPITAL - select item
<escape> - exit menu
