Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!decvax!harpo!seismo!hao!hplabs!sri-unix!w8sdz@brl From: w8sdz@brl@sri-unix.UUCP Newsgroups: net.micro Subject: Re: Some modems dont work on some lines Message-ID: <3609@sri-arpa.UUCP> Date: Fri, 29-Jul-83 12:23:58 EDT Article-I.D.: sri-arpa.3609 Posted: Fri Jul 29 12:23:58 1983 Date-Received: Mon, 1-Aug-83 09:39:00 EDT Lines: 12 From: Keith PetersenMake sure that only "tip" and "ring" are connected at the modular plug. (that's usually red and green wires). If the other two (usually unused) black and yellow wires are connected, some modems will refuse to operate. Because of this, some manufacturers of modems are suppling a modular "Y" connector that only supports tip and ring connections to the modem. In a commercial multi-line telephone the yellow and black wires are used for what's called the "A Lead", which is a circuit that connects to auxilary hook-switch contacts in your telephone. This circuit is used to cancel the "Hold" relay when you pick up the phone. --Keith