ALARMS, TROUBLESHOOTING & TESTING
13
WC3445 with DS3 interface - Step 3B
If the status LED is red, first check that the
PORT SELECT
bit-switch is set to DS3. If it is set
correctly, try swapping the LINE BNC connections at that unit.
If the status LED remains red try looping the BNC connections on the unit with a short piece
of cable. If the status LED goes steady green, then the external BNC cabling is faulty. Check
for cable continuity and network connections, etc.
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 WC3445 and a fixed (i.e. non-
negotiating) LAN port, bit-switch 7 must be set to 100M FD. If this is not done, the WC3445
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 WC3445
Set the remote WC3445 base panel bit-switch labelled
LOOPBACK
to the
ON
position.
When the
TEST LOOP
is activated at the remote WC3445, the signal received from the local
Bit Error Rate Tester (BERT) unit at the WAN port is passed directly back to the BERT at
the line interface.
If the local BERT recognises its own transmissions, then the link has been validated.
WC3445 - Unit A
WC3445 - Unit B
WAN-in-a-CAN
WAN-in-a-CAN
