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E&m signaling types – Cabletron Systems 1800 User Manual

Page 406

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C-14

SmartSwitch 1800 4. 0 User G uide, Rev 01

Figure C-8 E&M Connections

E&M Signaling Types

The SmartSwitch 1800 supports five E&M signaling standards (Types I through V)
for PBX tie line interfaces. These conventions, as defined by AT&T specifications, are
described below.

With each signaling type, the PBX supplies one signal, known as the "M" signal (for
Mouth), and accepts one signal, known as the "E" signal (for Ear). Conversely, the tie
line equipment (e.g., the SmartSwitch 1800) accepts the "M" signal from the PBX and
provides the "E" signal to the PBX. The "M" signal accepted by the tie line equipment
at one end of a tie circuit becomes the "E" signal output by the remote tie line interface.
The five E&M signaling types are illustrated in the following figure.

E&M PBX TO PBX C O NN ECTIO N

E& M CO NN ECT ION T HRO UG H SD M - FP

SDM-FP

SDM-FP

1800

1800