[comp.protocols.tcp-ip] Why do mysterious UUUUUUUUUUUUs sometimes dance on my

RAF@CU.NIH.GOV ("Roger Fajman") (11/12/90)

This is rather off the subject of TCP/IP.  Perhaps further discussion
should be moved to Info-Modems Digest.

There was a bug in the original Bell 212 modem that managed to make its
way into some compatible modems.  The modem would erroneously enter
remote digital loop.  On one end this appeared as a continuous stream
of Us and on the other as a hung connection.  The bug was fixed in
later versions of the 212.  The bypass was to disable remote digital
loop.  At NIH we were early users of the 212 and worked with AT&T (Bell
Labs, as I recall) to assist them in tracking down the cause of the
problem.

Roger Fajman                                   Telephone:  +1 301 402 1246
National Institutes of Health                  BITNET:     RAF@NIHCU
Bethesda, Maryland, USA                        Internet:   RAF@CU.NIH.GOV