On 04/28/2014 07:37 PM, Henry Hallam wrote: > On Mon, Apr 28, 2014 at 10:14 AM, William Unruh <un...@invalid.ca> wrote: >> Not sure why they would need a lower cutoff, except that it would allow >> the ancient telephone receivers to comply. Certainly one can make >> cheap receivers now that go a lot lower than 300Hz. > > Because 3.1 kHz of bandwidth is cheaper for the telcos to trunk than 3.4 kHz.
Not really. The reason is that DC is used for signalling (e.g. on/off-hook, hookflash, pulse dialing). Way OT tho. _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
