Using The Jm008 Module - Comdial DSU II System Manual

IMI66–132
2.14.2

Using The JM008 Module

The JM008 expansion module provides an interface for a wide variety of industry-standard
telephone (IST) equipment such as 500 and 2500-type telephones, cordless telephones, voice
mail systems, answering machines, FAX machines, and data modems.
Each IST port drives a load with a maximum ringer equivalence number (REN) of 2.0. Check
the REN number of the connected IST equipment so you do not exceed the capacity of the IST
port. Improper operation may result if you exceed the REN maximum.
The default numbering of the expansion module stations begin with the next higher station port
number from that provided by the host base unit. The numbering continues sequentially from top
module to bottom module if two modules are installed. For example: The defaulted 8-line,
16-station base unit provides station ports 10 through 25. When installed, a JM008 expansion
module provides station ports 26 through 33. A second JM008, when installed in the bottom
mounting location, provides station ports 34 through 41.
If you install both a JM408 and a JM008 on the same cabinet, you must install the JM408 at
the upper expansion module location or the lines provided by the JM408 will not function.
When you install the JM008 and connect IST devices to it, there are several programming
requirements that you must consider. Refer to Chapter 3, Section 3.10 for complete details.
2 – 44 Installing The DSU II Digital Telephone System
CAUTION
DSU II Digital Telephone System