Identify this hardware

[DanceMan]

Another one of my garage sale buys:

Slim rack mount (hub or?), Northern Telecom (Nortel) HU701601.
It has 16 cat5 connections beside two main cat5 connections that are marked R1 or RI and R0 or RO. THe two Rx ports have rocker switches with pictographs of arrows. The unit is unpowered, no power plug or connector.

What do I have and how is it used?

[Tuttle]

Googling for it suggests it might be a Token Ring hub, in which case it's no use without Token Ring NICs. Token Ring is all but non-existent these days.

See http://www.datacottage.com/nch/troperation.htm for a bit of general info.

[DanceMan]

Thanks, Tuttle. I'll check the link. The arrow pictograms on the switches show two arrows going in opposite directions in one position and in the other, two arrows meeting at the switch and looping back, like two "U" laid on their sides with bottoms touching.

[wetling]

The Rx ports are Ring In and Ring Out ports. That's how you connect multiple MAUs.

[DanceMan]

Thanks for the help. It's a token ring MAU, multi-station access unit.