I am installing a 4/16 into expansion unit one on a BCM 50 and all the stations work but I cannot get dial tone. The lines work from the CO and the system is patched up to date. We have tried new cards and new expansion units.ANy ideas????
Did you properly dipswitch the MBM and make sure you have a keycode for the expansion unit.
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I have had a lot of trouble with 4 x 16 & 8 x 16 cards not downloading the firmware to the card when I do an out of box install. I take the card & put it in a BCM 400 to get it's firmware & than stick it back in the BCM 50.
Do you have a separate cable harness connected to the line port off the card.
1 cable harness for the extns. pairs 1-16
1 cable harness for the lines. see below
the lines connect to pairs 1-2 and pairs 5-6 off the second cable harness.
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