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- From: wolfgang@wsrcc.com (Wolfgang S. Rupprecht)
- Newsgroups: comp.sys.sun.apps
- Subject: Re: SupraFaxmodem & NetFax
- Keywords: fax, modem, netfax
- Message-ID: <Bs27nL.7HA@wsrcc.com>
- Date: 27 Jul 92 18:06:56 GMT
- References: <1992Jul12.155150.8032@cs.cmu.edu>
- Organization: W S Rupprecht Computer Consulting, Fremont CA
- Lines: 154
-
- fitz@frc2.frc.ri.cmu.edu (Kerien Fitzpatrick) writes:
- >Is anyone else trying to use one of the new SupraFaxmodem V.32bis modems
- >with NetFax 2.1. I am already using NetFax with an Everex EverFax modem
- >and everything works fine. When I try to use the Supra I get one strange
- >result. The output on the receiving end is two pages long (for each page).
- >All the text is just stretched vertically. I've checked the parameters sent
- >to the remote fax and everything is the same as for the Everex. The only
- >thing I could think of is that the density ( #lpi) was wrong, but it is
- >correct. If anyone else has or is trying to get this combination working
- >I would like to hear about their results.
-
- Another Supra V.32/faxmodem victim. Join the club.
-
- -*- mode: text -*-
- ###############################################################################
- ## ##
- ## File: BUGS ##
- ## Author: Wolfgang S. Rupprecht <wolfgang@wsrcc.com> ##
- ## Created: Wed May 13 22:39:11 PDT 1992 ##
- ## Contents: Supra bugs
- ## ##
- ## Copyright (c) 1992 Wolfgang S. Rupprecht. ##
- ## All rights reserved. ##
- ## ##
- ## $Header$ ##
- ###############################################################################
-
- Supra V.32bis modem
- MODEM #14E-002800
-
- 1) During fax transmission DCD is low. This makes using HW flow
- problematic.
-
- (Sunbug: Due to Sun OS bugs rcv is off if HW flow is enabled
- and CD is off. HW flow needs to be on for page transmission.
- Technically this follows the RS-232 standard. But why is it
- only followed if (outgoing) HW flow is active?)
-
- 2) FAX doesn't hang up if DTR is low. &D2 or &D3 mode.
-
- fax will actually stay Off Hook with *NO* modem lines
- active either in or out.
-
- 3) Manual claims that you can't auto-reload params on DTR low *and*
- have hang-up on DTR low. (feature clash problem &D2 &D3)
-
- Having both is really needed for a robust system.
-
- This may just be a documentation bug. The modem does appear
- to drop an active connection when DTR drops. (Thanks to John
- Hood for pointing this out.)
-
- 4) Can't lock computer-modem baud rate to known value on incoming
- (dialin) phone connection.
-
- When the modem powers up the computer-modem buad rate is
- undefined. The modem appears to track any computer to modem
- output or line noise and use that to "autobaud" to a new
- connection rate. Incoming calls are subjected to whatever
- baud rate the modem last saw (or thought it saw) on the last
- outgoing connection.
-
- Perhaps after a DTR induced reset the baud rate is reset to
- the speed in use for the last &w command. I must check
- this (but how????)
-
- 5) Carrier loss to CD delay is a constant ~ 20 seconds. Register s10
- has no effect. (ditto for s9)
-
- This is only in modem mode. CD never appears in fax mode!
-
- 6) busy detection is buggy. Often one gets voice answers that
- generate a "busy". Other times a real busy isn't detected.
-
- I did a sleep and quick redail on BUSY, until I noticed that
- BUSY was being detected for an outgoing voicemail message.
-
- 7) sending +FET=2 doesn't generate an OK command reply.
-
- out: AT+FET=2
- in: +FPTS: 1
- in: +FHNG: 0
- AT+FET=2 failed - timeout
-
- 8) wait for carrier register s37 = 5 has no effect in fax mode, after
- ATA command. We will wait for quite a while.
-
- 9) The ATA command will not return OK or ERROR after +FCON. Remote
- site eventually drops line.
-
- This means class 2 receive doesn't work appear to at all.
-
- 10) Supra appearently uses the FDCC VR values instead of the FDT VR
- value for each transfer. This leads to double/half size pages
- of printout.
-
- 11) Supra answers phone even if DTR is low. (eg. when S0=1, &D3)
- DTR should inhibit any modem action, and hold the modem in a
- reset state.
-
- 12) If incoming call disconnects before the speed negotiation completes
- (as in a voice call) the Supra will then lock onto the
- following dialtone and claim "300" on the display. The modem
- appears to eventually go back on hook. But I wonder how long
- it might "talk" to the dialtone.
-
- 13) Modem often has trouble locking onto a trailblazer (at 2400 baud)
- located on a second phone line right next to it.
-
- 14) The ST scan Fax line scan time is negotiated up to max setting for
- no appearent reason. On a fax send send the other side can
- claim a scan time of 4. I claim a scan time of 0 (or 4). The
- Supra and Fax then negotiate a 7!
-
- 15) If FAA=1 Supra doesn't answer adaptively as either FAX or Data
- modem. If FCLASS=2 the modem will not answer data calls.
-
- out: AT+FCLASS=2
- in: OK
- out: AT+FAA=1
- in: OK
- out: AT+FCR=1
- in: OK
- in: RING
- out: ATA
- in: +FHNG: 1
- in: OK
-
- 16) AT+FBUG=1 doesn't turn on debuging. Not technically a bug, but
- certainly not a feature either.
-
- 17) Writing to the Supra immediately after DTR goes high, after a
- DTR-low reset has taken place, will leave the modem in a
- confused state. Eeprom parameters are not correctly reloaded.
-
- ---------
- from the net:
- ---------
-
- n1) Spkr volume setting L0-L3 don't have any effect. Needs PC board
- fix.
-
- n2) The -,*,) LAPM/MNP commands don't work. Will be a ROM fix.
-
- n3) Supra never originates fallback/fallforward speed changes. Two
- Supras talking on a bad line won't ever negotiate for a better
- connection.
-
-
-
-
- --
- Wolfgang Rupprecht wolfgang@wsrcc.com (or) wsrcc!wolfgang
- Snail Mail: 39469 Gallaudet Drive, Fremont, CA 94538-4511
-