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- From: ST7021@SIUCVMB.SIU.EDU
- Newsgroups: comp.dcom.modems
- Subject: IBM 7855-10 Disconnect at Phone Pick-Up
- Message-ID: <9209090702.AA17611@ucbvax.Berkeley.EDU>
- Date: 9 Sep 92 01:27:19 GMT
- Sender: usenet@ucbvax.BERKELEY.EDU
- Organization: The Internet
- Lines: 38
-
- I am using an IBM 7855-10 modem (12000bps). It connects fine to a wide variety
- of modems that I use.
-
- A problem that I experience is that it lose connection when someone in my
- house picks up a phone. It seems to do this commonly when running at
- 9600/12000bps.
-
- At this point, I am not sure which direction to place blame. I will leave
- my modem's speaker active and, after a phone pick-up, I will hear the other
- end hang-up. My modem always stays on and the LCD display says
- "Retraining...". I can hear it beeping away trying to recover the connection.
- I am not satisfied, however, that this is the other modems' fault. This happens
- on USRs, Hayes, Bocas, etc. Not sure about other 7855-10's.
-
- This device will accept line noise with no problems. I've (for fun...) brought
- the line noise upto "F" (on a scale from 0-F). It still hung in there.
-
- o Is this some V.32(bis) thing (my old Hayes VS9600 doesn't do this at
- 9600)?
- o Could it be interpreting the drop in volume (or whatever) as a Break
- signal? Would that be relevant?
- o Is there a register that I can alter that will make it more tolerant
- to this?
-
- I can understand how rough a local line pick-up can be on the carrier, but I
- was hoping the error correction would be a bit more fault tolerant.
-
- Following are my standard register values (for completeness):
-
- B0 E1 L2 M1 Q0 V1 X4 Y1 &C1 &D2 &G0 &J0 &L0 &P0 &Q0 &R0 &S1 &X0 &Y0
- S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:060
- S08:001 S09:000 S10:015 S12:050 S14:8AH S16:00H S18:000 S21:B4H
- S22:46H S23:3DH S25:000 S26:000 S27:00H
-
- Thanks for any ideas!
-
- Thomas Boehler
-
-