ALARMS, TROUBLESHOOTING & TESTING
14
Other steps
It may be useful to set the
AUTO MDI/MDI-X
bit-switch to
DISABLED
, in which case the port
presents a fixed MDI-X interface to the LAN.
Note that for 100M full duplex operation between the WC1000 and a fixed (i.e. non-
negotiating) LAN port, Bit-switch 7 must be set to 100M FD. If this is not done, the WC1000
will operate at the correct speed, but in half duplex mode, and with a heavy error count.
4. 3 Test Loop
Figure 4. 2 Test loop on remote WC1000
Set the remote WC1000 base panel bit-switch labelled
LOOPBACK
to the
ON
position.
When the
TEST LOOP
is activated at the remote WC1000, the signal received from the local
Bit Error Rate Tester (BERT) unit at the E1 port is passed directly back to the BERT at the
line interface.
If the local BERT recognises its own transmissions, then the E1 link has been validated.
Remote WC1000 Loopback Switch On
WAN-in-a-CAN
Bit Error Rate Tester
(BERT)
PRBS
Signal
