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C-14 SmartSwitch 1800 4.0 User Guide, 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 CONN ECTION
E&M CONNECTION THROUGH SDM-FP
1800
1800