The cabinet cover is gray with Nortel/Northern Telecom in blue ink written on it. The circuit cards are pretty small and their faceplates are also gray. I am almost certain it is some type of channel bank as it has a 8 pin connector which had a plug in it that was plugged into a "SmartJack", and as I said before it has 24 slots for these cards... No one Ive spoken to seems to know what this thing is and its strange because the unit really appears to be brand new.