Comdial Dxp Plus Instructions Manual

Installing And Programming The Off-Premise Extension
Interface On The Digital Communications System
1.0 Introducing The Off-Premise Extension Interface
This publication describes the features, applications, installation, specifications, and operation of the off-premise
extension interface (OPX-X). The OPX-X is a multipurpose accessory with dual circuits that provide the
following features:
·OFF-PREMISE EXTENSION—This feature adapts most industry-standard telephone devices to the digital
communications...

1.1 Detailing The Specifications
Electrical Specifications
Power requirements: 117VAC +/- 10% single-phase @ .13A
maximum
Ringing voltage: 95 VAC Nominal @ 20 Hz
Power rated to maximum REN = 2.0
Battery feed voltage: 50 VDC nominal
Loop current limits: 20 ma min. at 1500 ohms
50 ma max. at 0 ohms
DC loop limits: 1500 ohms maximum including telephony
device (Approximately 20,000 feet with #24
AWG twisted-pair cable and 400 ohm device
load)
Cable insulation resistance: 30,000 ohms minimum
Cable requirement...

Environmental Specifications
Operating temperature: 32-122 F (0-50 C)
Humidity: 90 % relative, non-condensing
Mechanical Specifications
Height: 3.0 in.
Width: 10.25 in.
Length: 11.50 in.
Weight: 8 lbs. (plus 2 lbs. for packing material)
Industry/Regulatory Standards
FCC registered Key System: CVW7WC-12829-KF-E
Hybrid/Key System: CVW7WC-16553-MF-E
FCC certified, Part 15 (class A)
UL listed
Leased Line Specifications
Facility interface code: 0L13C
Line conditioning: Dry metallic
Installing And Programming...

2.0 Installing the Off-Premise Extension Interface
2.1 Detailing The Mounting Considerations
·You can attach the OPX-X to any sturdy, flat, surface. It may be vertically rack mounted if desired.
·you must locate the OPX-X within six (6) feet of the proper electrical outlet. It requires a 117VAC circuit, with
a third-wire ground, supplied to a standard (NEMA 5-15R) electrical outlet.
·you must keep the distance between the OPX-X and the KSU to 25 feet or less.
·Be sure that the mounting location is secure...

AW1002A
11.50
10.25
3.0
8.75
7.0
Detailing The OPX-X Dimensions
Installing And Programming The OPX-X IMI89–209
Installing The OPX-X – 5 

2.3 Connecting The Equipment
·Route the necessary cabling, and connect the OPX-X to the digital communications system per the connections
detailed on the next page.
·The installation requires a grounding wire separate from the third-wire AC line cord ground. The OPX-X
cabinet provides a ground stud. Connect a #10 or #12, insulated, solid copper, wire between this ground stud
and either the ground stud on the digital communications system cabinet or a reliable earth ground.
·Plug the AC line cord for the...

Connecting The Equipment
Installing And Programming The OPX-X IMI89–209
Installing The OPX-X – 7 

2.5 Setting The Configuration Switches
You must set the OPX-X’s configuration switches to match the digital communications system. The switches are
located in an opening on the left side of the cabinet.
Setting The Configuration Switches
Switch System Condition Setting
A
System programmed to assign analog station port to OPX-X for circuit 1 Yes Closed
No Open*
BSystem programmed to assign analog station port to OPX-X for circuit 2 Yes Closed
No Open*
C
Key- System
Configured
with . .Voice first intercom...

3.0 Programming For Off Premise Extension Interface Operation
When operated through the OPX-X, the IST provides basic intercom service coupled with the ability to access
outside lines. You can program the analog station port (through which the IST is being interfaced via the OPX-X)
for eitherprime intercomoperation orprime line automatic and idle line preferenceoperation. Default is for
prime intercom. Under either operating condition, you can program the station port to receive outside line ringing
and...

3.5 Programming Procedures
The OPX-X automatically identifies itself as an analog terminal interface for the digital station board as soon as
you connect it to the digital communications system.
Prime Line Programming
Prime Line Type
When you enable this feature, the station automatically selects a line, line group, or intercom number for use when
the station user takes the station off hook. Use the programming procedures shown below to select the line port,
line group, or intercom number to serve as the...