Terms used as applied to Data (and some Voice) Transmission over Copper Wire

A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

E & M



E1 -- Digital transmission facility capable of carrying data rates of 2.048Mbps. Also known as G.703 - ITU-T. Usually used for access/egress to providers' premises. May be broken down into 32 channels 64kbps each . The US Telco's use T1 as the primary digital communications method - also known as DS1. E1's are usually (but not necessarily) used outside of the US. See: T1

E & M (Ear and Mouth) -- Analogue signaling (primarily voice) over 4 wire copper. Includes the facilities for Loop Start and Ground Start. "E & M Signaling" is a voice transmission system using two pairs. "Ear and Mouth". The "E" is the receive, and the "M" is the transmit path for analogue signaling

Ethernet -- A very common method of networking computers in a LAN. Originally deployed for speeds up to 10Mbps and now 100Mbps. Can be used with almost any kind of computer.


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