Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!mcsun!unido!opal!tmpmbx!netmbx!oeschi From: oeschi@netmbx.UUCP (Johann Deutinger) Newsgroups: comp.dcom.fax Subject: Re: Group 3 and Group 4 faxcards Keywords: fax compression Message-ID: <1719@netmbx.UUCP> Date: 19 Jan 91 20:31:32 GMT References: <1991Jan17.015449.6383@cbnewsi.att.com> Organization: netmbx, Berlin, West Germany Lines: 27 In article <1991Jan17.015449.6383@cbnewsi.att.com> hrs1@cbnewsi.att.com (herman.r.silbiger) writes: >In article , raymond@cosc.canterbury.ac.nz (R P Wilson ) writes: >> >> Can anybody fill me in on relevant information about and differences between >> Group 3 and Group 4 faxcards? > >I have not heard of the existence of any group 4 faxcards. > >Herman Silbiger Most German ISDN-PC-card vendors support a software interface called _common_isdn_api_. This covers the lower levels of the OSI model. On top of this API at least one product here in Germany implements the necessary higher levels of the Group 4 fax protocol (which is nearly identical to the teletex protocol). Some of the ISDN boards also can be combined with a Group 3 faxcard. This is quite useful because doing only Group 4 would not make too much sense in most cases. Hans -- oeschi@netmbx.UUCP | Johann Deutinger voice +49 30 396 50 21 | Ferrari electronic GmbH (.. no, we don't sell cars) fax +49 30 396 80 20 | Beusselstr. 27 - 1000 Berlin 21 - FRG