ed@megadata.oz (Ed Rapsevicius) (02/06/89)
Help! We are using the Motorola MC68824 Token Bus Controller
with the Siemens SAB82511 token bus modem, and we have a
series of diagnostics running such as internal loopback, and
external loopback through the medium transformer. However
we seem to have two problems:
1) We cannot acheive a reasonable Silence threshold, even
though we have a double sided PCB with a large ground
plane around the main components. We are getting a
threshold of around 20 dBmV instead of 4.
2) A modem will receive its own transmission correctly,
but doesn't receive another modem's transmission.
The best we can do is a bad signal status.
If someone has successfully designed in this chip set, can
they perhaps mail some of their experiences to us.
Ed Rapsevicius (ed@megadata.oz, ed@megadata.oz.au)
Megadata P/L, North Ryde, Sydney Australia.
D