JUNIPER CTP2000-IM-8P-T1

The CTP2000 Series 4W&EM interface module has eight 4-wire E&M ports and provides support for voice applications. It is used with voice compression (VCOMP) bundles in CTP2000 models and can be used only with a CTP2000 compression module.

Four-wire audio interfaces with E and M signaling interfaces (4W&EM) are commonly used as trunks between a central office (CO) and a private branch exchange (PBX). E and M is a type of supervisory line signaling that uses separate leads, called the "E" (ear) lead and "M" (mouth) lead and are traditionally used in the telecommunications industry. In 4W&EM signaling, two wires are used to receive and two wires are used to transmit, incorporating simplex control and differential payload in each channel. Type I, II, and V signaling is supported.