I've been unable to send an IDSL signal from my ISP to my house 13,200 ft over 26 ga wire with the 32idsl card in a Max TNT. There are no loads, no taps and all the wire was installed in the last two years. The phone company tested the circuit antenuation at 80K and pronounced it good. The signal should have gone 18,000 feet. Trouble was, when the pipeline at the other end could see the TNT (rarely) I kept getting inband timeouts and dropped connections anytime I tried to transmit data. Here is what was wrong. First, the phone company used a pair that is in the 200 pair bundle coming into our ISP. This bundle contains several T1's lines using AMI line coding. Well, AMI and DSL don't get along very well. Crosstalk from AMI is serious noise to DSL and shortens the distance it can travel by 30% or more. Never mix AMI and DSL in the same bundle. Second, crosstalk from regular phone lines increases dramatically at the entry and exit points of a phone company CO. This is not normally a problem for signals originating in the CO because the noise level is low compared to the signal level in the CO. Signals originating from phone users are normally only down 3-6 dB at the CO. However, a DSL signal originating at the ISP may be down 10-20 dB when it enters the CO and it is not regenerated at the CO. Therefore, the noise level is significant and further reduces the total distance the signal can travel. And one I hadn't run into yet (but would have) - there is a limit on how many DSL circuits that you can run in a single bundle. Typically a bundle of 50 pairs will experience a 25% or greater reduction in distance as a result of echo cancellation problems when too many DSL circuits are in close proximity. Solutions? See if the phone company will let you put the Max TNT in the CO (ha, unless you have a team of lawyers and are a CLEC to boot) or have them run 22 or 24 ga high twist pairs to the CO just for your use (very expensive). Just though someone else should know xDSL may not work well for an ISP unless he is also the phone company. Think I'll see if I can talk the state regulators into granting ISP's the same access to the CO as CLEC's. --Tony ++ Ascend Users Mailing List ++ To unsubscribe: send unsubscribe to ascend-users-request@bungi.com To get FAQ'd: <<A HREF="http://www.nealis.net/ascend/faq">http://www.nealis.net/ascend/faq</A>> </PRE> <!--X-MsgBody-End--> <!--X-Follow-Ups--> <!--X-Follow-Ups-End--> <!--X-References--> <!--X-References-End--> <!--X-BotPNI--> <HR> <UL> <LI>Prev by Date: <STRONG><A HREF="msg09528.html">Re: (ASCEND) Feature Requests and Ascend?</A></STRONG> </LI> <LI>Next by Date: <STRONG><A HREF="msg09527.html">Re: (ASCEND) Ap27</A></STRONG> </LI> <LI>Prev by thread: <STRONG><A HREF="msg09525.html">(ASCEND) Adding outgoing call filters on the MAX</A></STRONG> </LI> <LI>Next by thread: <STRONG><A HREF="msg09555.html">Re: (ASCEND) xDSL limitations</A></STRONG> </LI> <LI>Index(es): <UL> <LI><A HREF="mail20.html#09529"><STRONG>Main</STRONG></A></LI> <LI><A HREF="thrd199.html#09529"><STRONG>Thread</STRONG></A></LI> </UL> </LI> </UL> <!--X-BotPNI-End--> <!--X-User-Footer--> <!--X-User-Footer-End--> </BODY> </HTML>