Specifications

E&M Ports 7-1
Chapter 7
E&M Ports
7.1 Introduction
This chapter provides connector pinouts, configuration, and troubleshooting information for
the E&M Voice Circuits.
The E&M ports manage the flow of toll-grade voice traffic through the IMACS-200 system.
Each port encodes an analog (voice, VF) signal to a digital bitstream at the local integrated
access system for transmission over a T1 network. Each port also decodes the digital signal to
analog at the remote system. The E&M ports support Transmit Only (TO) in the initial release.
Each port connects to a CPE voice circuits from a PBX or other user facility. On this, the initial
release of the IMACS-200, Transmission-Only is the only supported mode.
7.2 E&M Description
7.2.1 IMACS-200 E&M Description
The IMACS-200 E&M ports provide an extended transmit TLP range (-16.3dB to + 7.5) for
dedicated 4-wire modem applications. This range is required for data speeds of 19.2 kbps and
higher.