k9un@iwsl7.UUCP (07/28/83)
I have a Rixon Sangamo 1200b modem that worked fine 'til I moved to a new office here at the labs. On my new data line, I can dial my phone, get an answer and carrieer, but the modem refuses to recognize it (all the usual signals like TR.. are ok). The modem works fine on other lines. The line "seems" to function fine audibly. I also tried a DEC DFO3 modem and it also doesn't work. Finally, I tried a Penril DCD modem and what da ya know? It works! Any suggestions? Our local people who are in charge of these lines have no t been very responsive. I seem to remeb=mber having a similar problem at home on my apple with the Rixon modem. Wes Ague
rb@houxn.UUCP (R.BOTWIN) (07/29/83)
Most likely problem is polarity! Try reversing the tip and ring wires (usually red/green pair)... All other things being equal that seems to be the problem... Some things are polarity sensitive (like older touchtone units). Rob Botwin ABI/BTL .....houxn!rb
horton@uiuccsb.UUCP (08/02/83)
#R:iwsl7:-10200:uiuccsb:9900004:000:486 uiuccsb!horton Aug 2 00:44:00 1983 Re: Some modems dont work on some lines I can recall an instance where a modem worked on one phone line but not another. A different modem worked on both lines. Turns out the mysterious modem used the black/yellow leads for some kind of "data mode" switch. The telco installer had left the spade lugs loose inside the box and they had shorted together (as I recall). The other modem didnt even have the black/yellow conductors in the cable. kurt horton pur-ee!uiucdcs!horton