DMS100 is a Nortel line side class 5 end office switch. A BITS clock is a simple device that provides a timing pulse.
------------------------------------ Planet 3 Communications Frank Perk [EMAIL PROTECTED] 2810 Sweet Home Road Amherst, NY 14228 tel: 716 929 VoIP (8647) x101 fax: 716 929 8648 mobile: 716 430 6996 Skype ID:frankperk ------------------------------------ -----Original Message----- From: Ian Darwin [mailto:[EMAIL PROTECTED] Sent: Friday, March 24, 2006 1:15 PM To: [EMAIL PROTECTED] Cc: 'TAUG' Subject: Re: [on-asterisk] Re: **SPAM: RE: [on-asterisk] Timing Device Hardware (zaptel interfaces) and Software (ztdummy) Frank Perk wrote: > > Folks. I don't want to overstress the impact of the timing device. > > YES, one is needed for conference, MOH (which is technically a bridge > with the music file) and all other bridged calls. > > Can you time from the cpu itself?? YES. Will it necessarily be > dependable -- NO. > > Will you definitely have problems -- NO > > A timing source is required for all PBX devices as they must conform > to the Telcordia (formerly bellcore) standard as a DMS100 level (line > side Class 5) device. > > ... > > ALSO, many telco providers elect to use the T1 timing signal on their > own facilities instead of buying the $150 BITS clock and $50 GPS > antenna needed to interface. This means that the clock source they are > using will actually introduce latency and on long T1 runs this can > cause slips right at the LSO. > Intriguing - can you say more about these DMS100 "BITS" clocks? Is that a manufacturer or a model? How do they interface - could your use one of those on a (small network of) * boxes that didn't have any zaptel cards? Could you extract the timing signal from a domestic GPS receiver over USB? Thanks for the info! --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
