[vm_tech]

Originally Posted by weesteev

This will be a MUX unit with a faulty line card, the ticking is an error LED on the card that has an audible tick. With the shut off of POTS, these cards are now starting to become redundant and if a fault develops on an unused card its not replaced. This is probably more common in ex-Telewest areas where there are PDH muxes in the street cabinets, the NTL build was mostly SDH and the "newer" equipment doesnt have this ticking trait.

Good old C-Mux+ cards