Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site unccvax.UUCP Path: utzoo!linus!decvax!mcnc!unccvax!dsi From: dsi@unccvax.UUCP (Dataspan Inc) Newsgroups: net.dcom Subject: Re: 2-line phone and modem problems Message-ID: <265@unccvax.UUCP> Date: Sat, 10-Aug-85 10:54:39 EDT Article-I.D.: unccvax.265 Posted: Sat Aug 10 10:54:39 1985 Date-Received: Wed, 14-Aug-85 00:30:07 EDT References: <427@ucdavis.UUCP>, <1378@cbosgd.UUCP> Organization: UNC-Charlotte Lines: 34 This might be a case of the AML/SSL(?) device giving a lot of problems. These units look like a very large lid for ladies' powder, coloured the obligatory telephone grey, and are screwed to the wall near the telephone in question. What this little turkey does (evidently) is multiplex a second telephone circuit on the present subscriber loop. There is also a trap which notches out the various carriers, etc. to control the AML unit - for the regular lines on the ** other ** loop. AML units are not noted for their tremendous linearity and distortion characteristics. In addition, they have a on-board battery (charged by the -48 v from the CO) which runs down after about an hour of talking. If some turkey keeps ringing your phone while you are away, you get a dead battery in about 5 minutes. ( Even if your modem did work through it, the AML signal quality deteriorates rapidly because of this....) You can't (fer sure) use a UDS 9600 A/B over one of the Continental Telephone AML's; but the outside trap for the host line doesn't seem to affect this modem. However, most yuppie modems don't have automatic adaptive equalisation, and might get screwed up by the group delay characteristics of this filter (it didn't have to be linear phase for the original purpose). Try the other telephone line, and look for an AML unit near one of your telephones; or a trap (it is usually stamped with the Continental Telephone logo) near the loop arc suppressor outside. If you have to get rid of an AML and insist on a real dry pair, DO NOT TELL THEM IT IS FOR DATA but rather that you are a doctor (or something) and need more reliable communications...the battery running down is a real inconvenience. See, your phones must have some frequency response past 3 kHz..... David Anthony DataSpan, Inc