Ref: 10860003
Title: SYNC LOOP ERROR on 3Server--two possible causes
Date: 7/28/88

Copyright 3Com Corporation, 1991.  All rights reserved.

Customer is running the extended diagnostic (thumbwheel position 13) on a
3server3 and the server fails with the error message: SYNC LOOP ERROR.

This error is caused by not having a loopback on the onboard AppleTalk
port on the 3server3.

Another possibility: the W009 jumper was not removed when AT Port
Expansion Board was added.
