---------- > From: Dave Van Allen <dave@fast.net> > To: 'Greg Hale' <greghale@logantele.com>; 'ascend-users@max.bungi.com' > Subject: RE: (ASCEND) T1 provisoning hints > Date: Saturday, June 28, 1997 1:08 AM > > Hi Greg, thanks for the nice words. > > Let me try to illustrate line-side versus trunk-side in the context of > what we're talking about here. > > As you know most switches, and certainly your DMS-10, can have (at > least) 2 different ways to connect to subscriber equipment. When > someone says that you are connected to the line-side of the switch, they > mean that you are connecting to individual, separate, analog ports that > have exactly one CO line. For all intents and purposes, the line-side > delivers classic electrical Tip and Ring, and you hook that up right to > copper paths. > > RBOC's, when they buy switches have to satisfy the bazillion pairs of > copper that ingress to the CO, and they do that by buying line-side > packs for the switch. > > Trunk-side is classically the digital side, and I believe got it's name > from that fact that "trunks of lines" were delivered in a digital format > from those packs. So the trunk-side of the switch would normally > aggregate 24 individual phone lines onto a T1 for delivery to customer > PBX's and such that know how to decode that format properly. This side > of the switch is truly digital, and has no analog component associated > with it. This is the "side" of the switch that you *want* your T1's > delivered from, and it is the "side" of the switch that all PRI are > delivered from. > > Here's the rub: Joe's ISP Inc. calls the RBOC, Bell Atlantic for > instance, and orders up a "channelized T1" from the Telco. They tell > Joe that this will be delivered on a T1 digitally to Joe's location. It > will have 24 voice channels, and they will all hunt to each other. It > will have a format and framing of B8ZS, ESF. Joe checks the Ascend Web > page, and all looks good so far. > > Then, and very often, and without your knowledge the RBOC will take 24 > line-side CO lines (remember, they're analog at this point!) and run > them into a D4 (or some other) channel bank that takes the 24 analog > lines, and multiplexes them onto a digital T1 to send to you. The > problem is that they added an A/D conversion in the path that you are > unaware of. This kills the whole party. You *must* be very specific > and ask for engineering verification from the RBOC, that there is > absolutely no A/D in the T1 path at all. (BTW, this is a classic reason > for never seeing 28.8K connections, but seeing loads of 26.4's) > > I used Bell Atlantic as an example because of my experience with them. > FYI, Bell Atlantic *always* provisions line-side T1's. They do not have > a tariff for trunk side. If you want trunk-side from BA, you first must > be enlightened enough to ask, then they must issue for internal approval > what is known as an HSA, or House Special Assembly. BA's charges for > trunk-side HSA T1's is close to $80 buck a line, with a $2000 install. > All RBOC's have the equivalent of an HSA - it's their way of getting > around tariff's for special circumstances. > > Nynex, on the other hand has a product they call FlexPath, which IS > provisioned trunk-side. > > Clear as mud? :-) > > Best regards, > > David Van Allen - You Tools Corporation / FASTNET(tm) > dave@fast.net (610) 289-1100 <A HREF="http://www.fast.net">http://www.fast.net</A> > FASTNET - PA/NJ/DE Internet Solutions ++ Ascend Users Mailing List ++ To unsubscribe: send unsubscribe to ascend-users-request@bungi.com To get FAQ'd: <<A HREF="http://www.shore.net/~dreaming/ascend-faq">http://www.shore.net/~dreaming/ascend-faq</A>> or <<A HREF="ftp://ftp.shore.net/members/dreaming/ascend-faq.txt">ftp://ftp.shore.net/members/dreaming/ascend-faq.txt</A>> </PRE> <!--X-MsgBody-End--> <!--X-Follow-Ups--> <HR> <STRONG>Follow-Ups</STRONG>: <UL> <LI><STRONG><A HREF="msg01463.html">Re: (ASCEND) T1 provisoning hints</A></STRONG></LI> <UL> <LI><EM>From</EM>: "Matthew S. Dwyer" <msd@dreamscape.com></LI> </UL> </UL> <!--X-Follow-Ups-End--> <!--X-References--> <!--X-References-End--> <!--X-BotPNI--> <HR> <UL> <LI>Prev by Date: <STRONG><A HREF="msg01462.html">Re: (ASCEND) Callback Problem</A></STRONG> </LI> <LI>Next by Date: <STRONG><A HREF="msg01460.html">Re: (ASCEND) Callback Problem</A></STRONG> </LI> <LI>Prev by thread: <STRONG><A HREF="msg01450.html">RE: (ASCEND) T1 provisoning hints</A></STRONG> </LI> <LI>Next by thread: <STRONG><A HREF="msg01463.html">Re: (ASCEND) T1 provisoning hints</A></STRONG> </LI> <LI>Index(es): <UL> <LI><A HREF="maillist.html#01461"><STRONG>Main</STRONG></A></LI> <LI><A HREF="thrd56.html#01461"><STRONG>Thread</STRONG></A></LI> </UL> </LI> </UL> <!--X-BotPNI-End--> <!--X-User-Footer--> <!--X-User-Footer-End--> </BODY> </HTML>