Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!sun-barr!texsun!texbell!vector!telecom-gateway From: desnoyer@apple.com (Peter Desnoyers) Newsgroups: comp.dcom.telecom Subject: Re: Modems and LD Carriers Message-ID: Date: 30 May 89 18:34:50 GMT Sender: news@vector.Dallas.TX.US Organization: Apple Computer Inc, Cupertino, CA Lines: 16 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 180, message 5 of 8 In article chip@vector.dallas.tx.us writes: >The only tariffed service using compression is M44, which uses the 32K >ADPCM speech compression algorithm. > ... >They wanted to get modem traffic right! People who build V.29 modems tell me that they didn't get it right enough. I've seen a paper on V.29 error performance over cascaded ADPCM lines, but I forget where. >-- >Chip Rosenthal / chip@vector.Dallas.TX.US / Dallas Semiconductor / 214-450-5337 Peter Desnoyers