Gavin Hamill wrote:
I know the cables themselves are wired correctly because our local PBX support made them, and they work perfectly when plugged into a real BT ISDN2e wallbox

it seems as if this is exactly your problem.
the wallbox has a NT pinout => straight trough cable
the hfc card has a TE pinout => you need a cross-over (isdn not ethernet!!) cable to connect to your local pbx which also has a TE pinout. the nt/te switches on the hfc card do not cross over the rx/tx pairs of the card. this has to be done with the cabling.
i don't think you will need any termination resistors if your cable is only a few meters and does not have any other devices on the bus.


regards
 frank sautter
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