Comdial Dsu II Installation Manual

2.14 Using The Add-On Expansion Modules
You can install optional add-on expansion modules to the DSU II common equipment base unit
to increase the line and station capacity of an installed system.
·The JM408 expansion module provides an additional four lines and eight digital proprietary
stations.
·The JM008 expansion module provides interface and ring generation for eight
industry-standard telephone devices.
Base Unit
TypeBase Unit Capacity
Expansion
Module TypeTotal System Capacity
LinesSystem...

Connecting Lines To The JM408 Expansion Module
The expansion module’s line connections are available at two modular jacks. When facing the
jack openings, lines 1 and 2 are provided by the jack on the right and lines 3 and 4 are provided
by the jack on the left.
Line JackPin
NumberConnectionTelephone
Number
11 No Connection
2 Line 2M Tip
3 Line 1M Tip
4 Line 1MRing
5 Line 2M Ring
6 No Connection
21 No Connection
2 Line 4M Tip
3 Line 3M Tip
4 Line 3M Ring
5 Line 4M Ring
6 No Connection
IMI66–132 DSU II...

Connecting Stations To The JM408 Expansion Module
The station connections are available at a 50-pin connector.
25-Pair Connections Two-Wire Connections Station Connections
Wire Color Pair Pin No.Clip
Term.Pair Wire Color Station Location
White-Blue
126 1
Signal PathGreen
1M
Blue-White 1 2 Red
White-Orange
227 3
Signal PathGreen
2M
Orange-White 2 4 Red
White-Green
328 5
Signal PathGreen
3M
Green-White 3 6 Red
White-Brown
429 7
Signal PathGreen
4M
Brown-White 4 8 Red
White-Slate
530 9
Signal PathGreen
5M...

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...

Connecting Stations To The JM008 Module
The station connections are available at a 50-pin connector.
25-Pair Connections Two-Wire Connections Station Connections
Wire Color Pair Pin No.Clip
Term.Pair Connection Station Location
White-Blue
126 1
Signal PathTip
1M
Blue-White 1 2 Ring
White-Orange
227 3
Signal PathTip
2M
Orange-White 2 4 Ring
White-Green
328 5
Signal PathTip
3M
Green-White 3 6 Ring
White-Brown
429 7
Signal PathTip
4M
Brown-White 4 8 Ring
White-Slate
530 9
Signal PathTip
5M
Slate-White 5 10...

Checking Industry-Standard Telephone Connections To The JM008 Module
When you connect industry-standard telephones to the JM008 expansion module, the maximum
distance allowed from the common equipment to the telephone is 1500 feet if you use #24 gauge
or larger, twisted pair cable.
Check the installation of industry-standard telephones for proper operation by performing the
following voltage measurements under the conditions listed:
– have both the common equipment and the stations connected to the...

Installing An OPX Long Loop Adapter With The JM008
You must use an OPX long loop adapter if you wish to adapt the JM008’s IST station port to
support an off-premise IST application. An OPX long loop adapter connects to a single
telephone line and can greatly extend the line’s loop length (the Proctor Model 46222 adapter*,
for example, can extend line length to 30,000 feet).
*Proctor & Associates Company, Redmond WA
CAUTION
When you connect an OPX long loop adapter to an off-premise extension (OPX), you...

2.14.3 Installing An Add-On Expansion Module
Each JM408 or JM008 add-on expansion module measures 15.5 wide x 9.4 high x 1.6 wide
and weighs approximately 4 pounds. The modules are designed so that you can attach them to
the base unit and connect them to it via cabling.
NOTE: If you plan to upgrade the system software at the same time that you add expansion
modules,
add the expansion modules first by following steps 1 through 11.  Then,
after you have installed the expansion modules and programmed for...

Typical Base Unit
Typical Add-On Module
(8-Line, 16-Station Base Unit)
Nameplate
(Remove to expose base
unit connectors)
To p
Location
Bottom
LocationUpper Mounting Holes
(2 Places)
Lower Mounting Holes
(2 Places)
Connecting Cable
and Plug
Snap Slots for
Nameplate Securing
ScrewGround
Modules
to Base
Unit
cajs111.cdr
Ground Base Cabinet
To Earth Ground.
Installing The Add-On Expansion Module
DSU II Digital Telephone System IMI66–132
Installing The DSU II Digital Telephone System 2 – 49 

2.15 Checking The System Installation
The system operating features are set to default conditions at initial power-up. These conditions
provide a basic operating system with a known set of parameters, and you should check out the
system with the default conditions in place. At any time while the system is operating, you can
reset default conditions from station port 10 or 12 following the instructions provided in chapter
3,Programming.
2.15.1 Checking The Resistance
Measure the resistance at the station...