That may be true of metro areas, but in rural USA there's plenty of TDM
to go around. Telco's are still delivering broadband on ADSL and phone
on TDM. Worse those trunked circuits are TDM over HDSL. In many rural
areas, there's not even ADSL or cable and that's within 40 miles of a
small city.
--Curtis
On 7/20/2015 5:33 PM, Owen DeLong wrote:
The TDM network is rapidly being eliminated. The major telcos have been moving
their backbones to VOIP and higher levels of oversubscription as a result for
years now because of the very large cost savings that can be achieved.
International TDM may still be pretty common, but domestic TDM is rapidly
becoming as popular as a Strowger.
Owen
On Jul 20, 2015, at 06:49 , Naslund, Steve <snasl...@medline.com> wrote:
End to end delay is not the most limiting factor. Jitter is the issue and
packet drops are the other issue that matters (more importantly the
distribution of drops). I think the best reason to select the local provider
over the distant one is that the sooner he gets off the IP network the less
impairments he will run into. The TDM network as antiquated as it is, is less
susceptible to congestion and call impairments than an IP backbone network is.
I can tell you from running a bunch of International VOIP networks that they
are just not as reliable as TDM. The average internet connection just does not
meet the reliability standards that the TDM voice network has achieved. IP
networks are affected by congestion and routing issues whereas the TDM network
seldom has these type of problems. An outage on a TDM circuit rarely affects
other TDM circuits so they see a lot less higher level outages. I can
understand why he does not want to haul his voice cross country over IP when he
is exiting locally most of the time.
Yes, I understand that the carrier might very well be hauling that traffic via
IP even after he gets to his gateway point but at that point it becomes their
problem to deal with.
Steven Naslund
Chicago IL
If you’re going to the PSTN, who gives a shit where you do the interconnect as
long as its within 100ms.
If most of your calls are VOIP<->VOIP within Chicago, then it makes some sense to
set up a box and just send the external calls out to the trunking provider where >you
no longer really care where they are.
Absent significant network suckage, there’s no place in the contiguous US that
isn’t within 100 ms of any other place in the contiguous US these days.
Owen
--
Best Regards
Curtis Maurand
Principal
Xyonet Web Hosting
mailto:cmaur...@xyonet.com
http://www.xyonet.com
