Specifications

LGCM4 2-5
Chapter 2 - System Components
LGCM4
The four port Loop/Ground CO gateway Module (LGCM4) provides four CO/PBX Loop/
Ground Start Line interfaces. These interfaces support pulse or DTMF dial signals. Each
Interface contains ring and loop current detection circuits, speech codec and compression
functions, and loop and ground signaling circuits. The circuitry and software support “Call
Progress Tone” and DTMF tone detection to support features such as Call Metering,
Automatic Redial, etc.
The LGCM4 includes the Ethernet port and MAC for the 10/100 Base-T Ethernet interface
as well as packet voice processing functions.
Front Panel
Front PanelFront Panel
Front Panel
The front panel of the LGCM4 has:
Rear Panel
Rear PanelRear Panel
Rear Panel
On the rear panel, the LGCM4 has:
Figure 2-2: LGCM4 Front & Rear Panels
Power jack for the AC/DC adapter supplied with the
LGCM4
Power status LED
Normal/Service Switch – in the Service mode, circuits in
use are busied as they return to idle
RJ-45 Female LAN connector with Speed and Link/
Activity LEDs
Four LEDs, one for status of each CO line
DB-9 RS-232 connector
Reset Switch
Four RJ-11 female connectors, one for each CO Line
Ground Lug
50-pin back plane connector. All signals on RJ-11
connectors are matched on the 50-pin back plane
connector.