From: "David Kay" <[email protected]> Subject: RE: E & M terminology . . . .
and to further this trivial persuit ... "Newton's Telecom Dictionary" says .... > E&M Leads stands for Ear and Mouth leads. In the olden days it was the > PBX operators who originated trunk calls by asking the long distance > carrier for free trunks (using their mouth or M lead). If the carrier had > a free trunk, the PBX operators heard about it through their ear or E lead. > As an aside, this is also the origin of the term "to want your ear" > because when the near-end E lead was grounded, this meant the > far-end was calling and "wanted your ear". I personally like the use of the term "olden" but, another colleague has noted that for 16 conductors in a cable, the E&M leads can show up as a pair. a I b j c k d l e m f n g o h p Dave Kay Nortel Networks
