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From: rcoltun@NI.UMD.EDU (Rob Coltun)
Newsgroups: comp.protocols.tcp-ip
Subject: Re:  can anyone identify this mystery box?
Message-ID: <9101140342.AA26762@ni.umd.edu>
Date: 14 Jan 91 03:42:21 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 6

Ahh. An error correction unit (ECU). Lets see, it was used to insure
reliability between two endpoints of a 50kb analog (line between 316/516
IMPs or maybe between an IMP and a VDH) or something like that. It's
been a long time, it's a bit fuzzy.

---rob