Comdial OPX-X The Off-Premise Extension Instrallation 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 system and allows them to be remotely located. The OPX-X will accept both tone (DTMF)
and pulse (rotary) dialing from these devices.
·TIE-LINE—This feature allows you to connect two systems to each other using single-pair wiring of dedicated
telephone lines.
·MODEM ADAPTER—This feature allows the flow of switched data between a data source and a data receiver
through the DXP Plus analog station ports.
The OPX-X is a dual off-premise extension (OPX) unit. It is housed in a self-contained metal enclosure that you
can either wall or rack mount. The OPX-X has an internal power supply and ringing generator. Dual, high
quality, low-loss, balanced, telephone transmission circuitry supports two off-premise extensions.
Each off-premise circuit can drive a load with a maximum ringer equivalence number (REN) of two (2) thus
allowing more than one industry-standard telephone connection at each off-premise location if desired.
The OPX-X will support virtually any industry-standard telephone device such as 500 and 2500-type telephones,
cordless telephones, answering machines, and data modems. The OPX-X provides the interfacing capability
required to connect these devices to analog station ports in digital communications system.
R
This manual has been developed by Comdial Corporation (the “Company”) and is intended for the use of its customers and service personnel. The information in this manual is subject to change
without notice. While every effort has been made to eliminate errors, the Company disclaims liability for any difficulties arising from the interpretation of the information contained herein.
The information contained herein does not purport to cover all details or variations in equipment or to provide for every possible contingency to be met in connection with installation, operation, or
maintenance. Should further information be desired, or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, contact Comdial, Inside Sales Department,
Charlottesville, Virginia 22906.
Printed in U.S.A.IMI89–209.02
9/95 
						

							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 OPX-X to digital communications system 2-pair, twisted
Cable terminations: 623-type, 4-conductor minijacks
Dialing: Industry-standard DTMF
Dial pulse (rotary) with nominal
make/break ratio of 40/60 @ 10 PPS
Ringing cadence: 1 second on/4 seconds off
(typical for intercom calls)
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							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 The OPX-X IMI89–209
Installing The OPX-X – 3 
						

							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 and dry and have adequate ventilation. Be sure that the temperature
range of the location is within 32-122° F (0-50° C).
·If the mounting surface is damp or if it is concrete or masonry material, you must attach a backboard to the
mounting surface. Suitable mounting backboards are available commercially or can be constructed out of
1/2-inch plywood cut to size.
·Tools and hardware required for mounting the KSU cabinet include:
·Fasteners - wood screws (1/4 x 1-inch round head), toggle bolts, or wall anchors.
·Screwdriver - to match fasteners.
·Electric drill - if prepared holes are required.
·Connecting tool - for fastening wires to a type-66 connector block.
·Crimping tool - for 623-type modular plugs.
2.2 Mounting The Cabinet
1. Unpack, and carefully inspect the OPX-X for shipping damage. Notify the shipper immediately of any
damages found. Verify that the packages contain all parts and accessories needed for proper installation and
operation.
2. If a backboard is required at the mounting location, attach it securely to provide a stable KSU mounting
surface.
3. Use the base of the OPX-X as a template or measure for mounting hole locations per the dimension details
shown in Figure 1.
4. Drill holes in the mounting surface of a proper size to accommodate the hardware being used. If necessary,
prepare these holes with inserts, anchors or other attachment devices as dictated by the type of mounting
surface.
5. Attach the OPX-X to the mounting surface with four (4) screws installed through the mounting flange and
into the mounting surface holes. Note that the flange holes are elongated with an enlargement at one end of
the hole. This feature allows the mounting screws to be partially installed in the mounting surface before the
KSU is hung on them.
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							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 OPX-X into a 117 VAC outlet. Observe the status light on the unit, and insure
that it turns on steady.
CAUTION
To help insure that foreign voltages, which could appear on the TELCO lines, do not damage the system,
be sure gas discharge tubes or similar protection devices are installed, and properly grounded, in all
connected TELCO lines.
2.4 Verifying Proper Installation
Use a voltmeter to check for the presence of either AC or DC voltage on the OPX1 and OPX 2 ports.
Make these voltage measurements with all system wiring installed and the AC power turned off.
1. Measure for both AC and DC voltage between the TIP lead of the OPX 1 port and the KSU grounding stud.
The measured voltage must be 0 volts.
2. Measure for both AC and DC voltage between the RING lead of the OPX 1 port and the KSU grounding stud.
The measured voltage must be 0 volts.
3. Repeat steps 1 and 2 for the OPX 2 port.
4. Apply AC power to the OPX-X.
5. Repeat steps 1–3. The measured voltage must now be approximately -50VDC.
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							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 signalling enabled(note 1)Closed*
Tone first intercom signalling enabled Open
Prime line automatic enabled Open
Hybrid system configured Open
D
(note 2)Off-premise device is intercom only Closed*
Off-premise device has access to outside line through the digital communications system Open
NOTE 1: This switch setting matches the system requirements. It is not possible to perform voice signalling
from a device connected through an OPX-X to the common equipment.
NOTE 2: When you have programmed the system to allow the off-premise device to have access to outside
line, you must also enable a signal delay to prevent transmission of extraneous DTMF tones from the
device over the outside line. When you enable this delay, the user must wait approximately 2 seconds
before speaking when performing call announce and paging over intercom line. When the off-premise
device is an intercom only device with no access to an outside line, you can disable the delay to facilitate
faster cut-through to call announce and paging.
*Factory settings
BOTTOM
OF
HOUSINGLEFT SIDE
OF HOUSING
A
B
D
CLOSED
OPEN
AW1001
Locating The Switches
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							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 to match either the rotary or DTMF dialing employed by the IST.
3.1 Detailing The Prime Intercom Operating Condition
With key-system configured digital communications systems, a system multiline telephone user can extend line
access for call origination to an IST station by employing the call transfer feature. To provide outside line ringing
to a prime intercom IST, program the OPX-X station port to have the ringing line preference feature and then
enable ringing for all lines that you want to ring at the IST.
With hybrid configured digital communications systems, you can make outside lines available to the IST for call
origination by programming the IST for line group access. With line group access, the IST user can access an
outside line by dialing the group access code over the intercom line. The digital communications system then
selects one of the grouped lines for IST use.
3.2 Detailing The Prime Line Automatic Or Idle Line
Preference Operating Condition
You can program an outside line as a prime line at the station port through which the IST is being interfaced, or
you can program that station port for idle line preference and then assign several lines to the station port.
With either prime line automatic or idle line preference, the IST has outside line dial tone for call origination
when its user lifts its handset. You can enable outside line ringing at the IST station port that you have
programmed for either prime line automatic or idle line preference. Alternately, you can enable the ringing line
preference feature for the IST station port.
The intercom line is still available to an IST even though you have provided outside line access. After going
off-hook, the IST user obtains intercom dial tone by performing a hookflash (press and release the hookswitch) or
by pressing the TAP button if one is available. Hookflash either drops the outside line (if the used dialed no digits
after lifting the handset) or (if the user dialed some digits) places the line on hold and provides intercom dial tone.
3.3 Detailing The Distinctive Ringing Condition
Intercom calls that ring at equipment connected through an OPX-X have a different cadence than outside calls
have. If desired, you can disable this distinctive ringing feature to make the intercom ring cadence the same as that
for outside calls.
3.4 Detailing The Through Dialing Condition
You can program the station port through which the IST is being interfaced for through-dialing or you can disable
the feature.  The system automatically enables the feature when you connect an OPX-X to the station port.
Through dialing enabled is necessary if the connected IST is a dual-tone multifrequency (DTMF) tone dial device
that requires that its generated dialing tones pass through the OPX-X, the common equipment, and onto a tone
dial compatible telephone line.
If the IST is a rotary telephone, you must disable the through dialing feature.
Installing And Programming The OPX-X IMI89–209
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							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 prime station calling interface.
1. Press CONTROL T for main menu.
2. From main menu, select stations and press ENTER.
3. From stations menu, select station programming.
4. Type personal intercom number or previously assigned name and press ENTER.
5. From station programming menu, type item number for feature and press ENTER.
6. Press SPACE BAR for desired value and press ENTER.
7. When finished, press ESCAPE twice.
8. Type y to accept changes, n to reject them, or r to resume editing and press ENTER.
9. Repeat steps 4-8 for each station or press ESCAPE to end.
Prime Line
Use this procedure to choose the prime line.
1. Press CONTROL T for main menu.
2. From main menu, select stations and press ENTER.
3. From stations menu, select station programming and press ENTER.
4. Type personal intercom number or station name and press ENTER.
5. From station programming menu, type item number for feature and press ENTER.
6. From prime line menu, type line port number (type as n,nn,nnn or n–nnn) and press ENTER.
7. When finished, press ESCAPE twice.
8. Type y to accept changes, n to reject them, or r to resume editing and press ENTER.
9. Repeat steps 4-8 for each station or press ESCAPE to end.
Prime Intercom Number
Use this procedure to choose the prime intercom number.
1. Press CONTROL T for main menu.
2. From main menu, select stations and press ENTER.
3. From stations menu, select station programming and press ENTER.
4. Type personal intercom number or station name and press ENTER.
5. From station programming menu type item number for feature and press ENTER.
6. From prime intercom menu, type personal intercom number and press ENTER.
7. When finished, press ESCAPE twice.
8. Type y to accept changes, n to reject them, or r to resume editing and press ENTER.
9. Repeat steps 4-8 for each station or press ESCAPE to end.
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10 –  Installing The OPX-X