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!
