6 May
2014
6 May
'14
11:55 p.m.
On Tue, May 6, 2014 at 10:57 PM, Steven Landon <slandon110 at gmail.com> wrote:
We want to recreate the fun of the unix dial in days,
and dialing in via
PPP to the internet. The goal eventually will be to have 12 lines serving
up Shell and PPP access via VOIP inbound at speeds around 14.4.
Cool project! I'm interested in hearing how well V.32bis QAM modulation
(14.4 Kbps) works over VOIP, since a lot of VOIP applies compression
schemes intended specifically for voice. On uncompressed PCM, or PCM with
only basic companding (mu-law or A-law) it should work fine, since that's
what has most commonly been used by the phone companies for carrying
domestic POTS calls. International voice calls often used more
compression, which at the very least could be expected to increase the
error rate.
Eric