Comdial Dxp Plus Instructions Manual

							Installing The Communications Card
Supplied Mounting
Hardware (8 Places)
Services BoardCommunications
Card
PLUS017
Supplied
Hardware (8 Places)
Interface Board
For Upper
Expansion
CabinetCommunications
Card
PLUS016
Supplied
Hardware (8 Places)
Interface Board
For Lower
Expansion
CabinetCommunications
Card
PLUS019
Installing The Communications Card IMI89–190
Installing The Communications Card – 5 
						

							4.0 Identifying The Communications Card’s Serial
Data Port Connections
Each communications card provides four serial data ports. Each serial data port is a standard 6-conductor modular
jack that serves as the interface connection between an external data device and the DXPPlussystem.
The system designates serial data ports 3–18 to specific locations and, you must take programming action to
match the data port number with the installation location that you choose for the communications card.
Serial Data Port Designation DXOPT–COM Location
Serial data ports 3–10 Lower two slots on the services board
Serial data ports 11–18Lower two slots on :
upper expansion cabinet interface board
–or–
lower expansion cabinet interface board
–or–
the auxiliary board installed in the main cabinet.
IMI89–190 Installing The Communications Card
6 – Installing The Communications Card 
						

							Identifying The Serial Data Port Locations
PLUS020
Interface Board
For Lower
Expansion Cabinet Serial
Ports
3 - 6
Serial
Ports
7 - 10
Serial
Ports
11 - 14
Serial
Ports
15 - 18
Services Board
Interface Board
For Upper
Expansion Cabinet
Auxiliary
Board (Main
Cabinet Location
ONLY)
Installing The Communications Card IMI89–190
Installing The Communications Card – 7 
						

							5.0 Connecting Data Devices
5.1 Selecting The Baud Rate
Each serial data communications port supports various baud rates, data bits, stop bits, parity, and flow control.
You can program these various options using the data base programming; however, the maximum baud rate that
you can assign to a serial data port varies depending upon whether you locate the communications card. Also, if a
device is transmitting/receiving data from the DXPPlusat a high rate, engineering sources recommend that you
use a communications protocol (such as RTS/CTS or XON/XOFF) to prevent buffer overrun and data loss.
Serial Data Port DXOPT–COM LocationMaximum
Baud Rate
Serial data ports 3–10 Lower two slots on the services board 19,200 Baud
Serial data ports 11–18Lower two slots on:
the upper expansion cabinet interface board,
–or–
the lower expansion cabinet interface board,
–or–
the auxiliary board installed in the main cabinet.9600 Baud
The maximum distance from a serial data port that you can confidently locate a data device is dependent upon the
baud rate at which you operate the serial data port.
·When operating the port at 9600 baud, your data cable run must be no longer than 500 feet.
·When operating the port at 19,200 baud, your data cable run must be no longer than 50 feet.
IMI89–190 Installing The Communications Card
8 – Installing The Communications Card 
						

							4.1 Making the Data Connections
Each serial data port is a standard 6–conductor modular jack that serves as the interface between an external data
device and the DXPPlussystem.
When preparing a data cable for connection to a data device, refer to the manufacturer’s manual for the equipment
being interfaced, and make the wiring connections detailed in the following list:
·Wire the common equipment RD (data from device to common equipment) connection to the device TD
(transmit data) connection.
·Wire the common equipment TD (data to device from common equipment) connection to the device RD
(receive data) connection.
·Wire the common equipment SG (signal ground) connection to the device SG (signal ground) connection.
·If required for proper operation, wire the common equipment CTS (clear-to-send status from device to common
equipment) connection to the device RTS (request-to-send) connection.
NOTE: The common equipment requires a positive voltage, with respect to signal ground, in order to send data.
If the cable has spare wires, be sure to ground them so that they will not act as antennas and induce interference
into the system. Further, if there is a source of RF power nearby (such as a radio transmitter), use shielded cable
and ground the shield at both ends.
CAUTION
As an added precaution against induced interference, route the data cable as far away from any
fluorescent lighting as you can reach, and make every effort to route the data cable perpendicular to other
wiring.
1
2
3
4
5
6
Pin 1 = (RTS) Request To Send
Pin 2 = (CTS) Clear To Send
Pin 3 = (RD) Receive Data
Pin 4 = (TD) Transmit Data
Pin 5 = (SG) Signal Ground
Pin 6 = (GND) Chasis Ground
PLUS50
Identifying The Serial Data Connections
Installing The Communications Card IMI89–190
Installing The Communications Card – 9 
						

							Charlottesville, Virginia 22901-2829
R
World Wide Web:  http://www.comdial.com/
Accredited by the Dutch Council
for Certification for certification
and registration activities.
Comdials Quality Management System Is
Certified To The ISO 9001 Standard.
IMI89–190 Installing The Communications Card 
						

							Installing The External Battery Assembly
On The DXP Plus Digital Communications System
1.0 Introducing The External Battery Assembly
The external battery assembly is for use with the DXPPlusdigital communications system. Unpack and carefully
inspect all equipment 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. The assembly includes the
following items:
·Batteries: Five 6-volt, 50 ampere-hour, (Comdial product code BT000-141), charger unit and interface cables.
·Metal enclosure with wire harness, includes combination circuit breaker, on/off switch
Should the AC power to the system be interrupted, one external battery assembly provides the following
minimum power capability:
·1.0 hour of operation for a fully loaded system.
Calculate the minimum battery backup time provided by an external battery assembly to a fully configured DXP
Plussystem using the following formula:
T = Back-up time in hours
K = 0.82 (Constant)
e = 50 (ampere-hour capacity of battery assembly)
N = Total number of stations
Example:
Assume that you have installed a DXP Plus with three cabinets supporting 472 telephones and containing one line
board along with a battery assembly to provide back-up power.
During AC operation, the battery assembly accepts re-charging current to maintain the voltage potential of its
batteries at an operational level.
NOTE: The external battery assembly requires approximately 10 hours to completely re-charge to full potential
after it has been completely discharged and, in some cases, when initially installed.
T=Ke
1 + [(0.084) (N)]
T=(.85)(50) 41.0
1 + [(0.084) (472)]=
40.65= 1.0 Hour
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 nor 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, Customer Service Department, Charlottesville, Virginia
22906.
Printed in U.S.A.IMI89–189.02
9/96 
						

							2.0 Understanding System Grounding Requirements
Transient voltage spikes, if induced onto CO or CENTREX lines, can travel through the cable and into the
common equipment. The telephone company offers basic protection against this condition but it is usually
designed to protect the central office circuits. While it will also provide some protection to the common
equipment, you should not rely upon it for total protection. To help ensure that external over-voltage surges do not
damage the system, you should install and properly ground primary protection devices, such as gas discharge
tubes or similar primary protection devices, on all lines. While the line boards have internal secondary surge
protection on all line ports, in order for this protection to be effective, youMUSTconnect the common equipment
cabinet to a reliable, effective earth ground.
Proper grounding is necessary for trouble-free operation and personnel safety. The DXPPlushas the following
three types of grounds:
·Service Ground —a neutral power line wire that is connected to the ground bus in the premises’ AC power
panel,
·System Ground—a non-current carrying power line wire that is connected to the ground bus in the premises’
AC power panel,
·Frame Ground—a low impedence conductor that places the common equipment cabinet at reference ground
potential. The frame ground provides the greatest safety by limiting electrical potential between non-current
carrying parts of the system. The common equipment cabinet provides a ground stud on its cabinet for access to
its frame ground.
The entire system is effectively earth-grounded when you permanently connect the common equipment cabinet,
all expansion cabinets, and the battery back-up assembly to earth or to some conducting body which serves in
place of earth.  The ground path must be of sufficient current-carrying capacity to prevent a build up of voltages
which may result in circuit noise, hazard to personnel, or equipment damage.
An acceptable earth ground is one such as the service ground for the AC power or a public metallic cold water
pipe at a point immediately at its entrance to the premises and ahead of any meters, pumps, or insulating sections
that have been added for vibration reduction. Avoid using the premises’ structural steel frame as it may not be at
earth ground potential. Use #10–12 or larger insulated solid copper grounding wire to connect the frame ground of
the battery assembly cabinet (available through the ground stud on the cabinet’s side) to the frame ground of the
main common equipment cabinet. Use #6 or larger insulated solid copper grounding wire to make the ground
connection from the main cabinet’s frame ground to earth ground.Keep this ground wire separate from the
three-wire AC line cord, do not splice it, and keep it as short as possible.
The impedence of the wiring between the common equipment cabinet frame ground and the earth ground must not
exceed 0.25 ohms and the impedence between the earth ground and the power company’s reference standard
ground must not exceed 5 ohms. Use an acceptable low impedence measuring device to measure the impedence of
these paths. The #6 or larger wire size will minimize the wiring impedence; however, if the impedence between
earth ground and the power company’s standard reference ground exceeds 5 ohms, contact the local power
company. The ground path must always be of sufficient current-carrying capacity to prevent a build up of voltages
that may result in circuit noise, hazard to personnel, or equipment damage.
Be sure that all of the ground connections are visible for inspection and maintenance. Tag all of the ground
connections with a sign that reads:Do Not Remove or Disconnect.
IMI89–189 Installing The External Battery Assembly
2 – Installing The Battery Back Up Assembly 
						

							PLUS073
Grounding Terminal Two Grounding TerminalsGrounding Terminal
Grounding Terminal
Typical Earth Ground
No. 6 Solid Copper
Wire To Earth Ground
From Main Cabinet
No. 10 or 12 Solid Copper
Wire Between Cabinets
Grounding The System
Installing The External Battery Assembly IMI89–189
Installing The Battery Back Up Assembly – 3 
						

							3.0 Mounting The Charger Chassis
You must mount the charger chassis to the battery cabinet; however, the particular position that you chose for this
mounting depends upon the method that you plan to mount the cabinet at the DXPPlussite.
·If you plan to mount the battery cabinet on a backboard at the side of the common equipment cabinets, you
must attach the charger, with its cables pointing toward you, to the left end of the battery cabinet as you face the
cabinet’s battery opening.
·If you plan to mount the battery cabinet below the main common equipment cabinet on the same backboard
(single common equipment cabinet installations), you must attach the charger, with its cables pointing toward
you, to the right end of the battery cabinet as you face the cabinet’s battery opening.
·If you plan to mount the battery cabinet on the back side of a standard 23–inch double equipment rack with the
common equipment cabinets mounted to the front side of the rack, you must attach the charger, with its cables
pointing away from you, to the to the left end of the battery cabinet as you face the cabinet’s battery opening.
To mount the charger chassis,
1. Choose the method of battery cabinet mounting, and orient the charger so that it is facing properly for the
mounting scheme.
2. Remove the front panel from the empty battery cabinet, and save the retaining hardware.
3. Remove the wiring access plate from the end of the battery cabinet.
4. Route the black battery connection wires through the wiring access hole.
5. Attach the charger chassis to the battery cabinet with the three supplied screws.
Charger Chasis
Wiring Access Plate
Battery Cabinet
Screws (3 Places)
bb480k
Mounting The Charger For Separate Backboard Installations
IMI89–189 Installing The External Battery Assembly
4 – Installing The Battery Back Up Assembly