Comdial Dxp Plus Instructions Manual

							4. Identify the expansion cabinet slots where you will install the T1/PRI boards and the primary and secondary
(if available) CO line supplier. With this knowledge, designate one T1/PRI board as primary and another as
secondary by placing straps on the services board and setting DIP switches on the expansion cabinet interface
board.
(a)If you install one T1/PRI board in an expansion cabinet, you must strap one pin-pair (J–M) on the
services board’s PRIMARY strap block. This strap designates the expansion cabinet where you have
installed the board. You must also close a DIP switch in switch bank A on the expansion cabinet’s
interface board to designate the expansion cabinet slot where you installed the T1/PRI board.
Example:If you install the T1/PRI board in universal slot 2 of the upper expansion cabinet, strap pin-pair
J on the PRIMARY strap block, and close SWA–2 on the upper expansion cabinet’s interface board.
(b)If you install two or more T1/PRI boards in an expansion cabinet, you must designate one board as
the primary board and another as the secondary board. After you have made these designations, you must
strap one pin-pair (J–M) on the services board’s PRIMARY strap block and one pin-pair (J–M) on its
SECONDARY strap block to designate the expansion cabinet where you have installed the primary and
secondary boards. You must also close a DIP switch on switch bank A and another on switch bank B on
the expansion cabinet’s interface board to designate the expansion cabinet slots where you installed the
primary and secondary T1/PRI boards. Do this same procedure if you use both expansion cabinets.
Example:If you install two T1/PRI boards in universal slots two and three in the upper expansion cabinet
and you designate these boards primary and secondary respectively, you must strap pin-pair J on the
PRIMARY strap block and strap pin-pair K on the SECONDARY strap block. You also must close
SWA–2 and SWB–3 on the upper expansion cabinet’s interface board.
5. If the system requiresT1/PRI boards in both main and expansion cabinets, identify the cabinet slots where
you will install the T1/PRI boards and the primary and secondary (if available) CO line supplier. With this
knowledge, designate any one T1/PRI board as primary and any other as secondary by placing straps on the
services board and setting DIP switches on the expansion cabinet interface board.
You must either strap one pin-pair (A–M) on the services board’s PRIMARY strap block or strap one pin-pair
(A–M) on its SECONDARY strap block. The T1/PRI board designation of primary or secondary and the
cabinet you use for its installation determines which services board pin-pair you use. You must also close a
DIP switch (SWA or SWB, 1–11) on the appropriate expansion cabinet’s interface board to designate the
expansion cabinet slot where you installed the opposite T1/PRI board.
Example:If you designate the T1/PRI board that you install in universal slot 2 of the main cabinet as the
primary board, strap pin-pair B on the services board PRIMARY strap block. If you designate the T1/PRI
board that you install in universal slot 2 in the upper expansion slot as the secondary board, strap pin-pair J on
the services board SECONDARY strap block, and close SWA–2 on the upper expansion cabinet’s interface
board.
Installing And Programming The DXPRI Card IMI89–255
Configuring The Services and Interface Boards – 15 
						

							Services Board
Primary Clock
Strapping Block Strapping
Pairs
A
B
C
D
E
F
G
H
I
J
K
L
M
Secondary Clock
Strapping Block
PLUS009
J6
J7
Upper
Cabinet
Lower
Cabinet
Locating The Services Board Strapping Blocks
IMI89–255 Installing And Programming The DXPRI Card
16 – Configuring The Services and Interface Boards 
						

							Open
OpenClosed
Closed Switch A
Expansion
Cabinet
Slot Locations
Switch B
Expansion
Cabinet
Slot Locations
Expansion Cabinet
Interface Board
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
89
10
11
12
9
10
11
12
PLUS010
SWA
SWB
Note:SWA-12 and SWB-12 are
not used on Interface 2 (upper
cabinet). SWA-11/12 and SWB-11/12
are not used on Interface 3 (lower
cabinet).SWA and SWB switches
not in use must be in off
(open) position
Locating The Interface Board DIP Switches
Installing And Programming The DXPRI Card IMI89–255
Configuring The Services and Interface Boards – 17 
						

							Installing Circuit Boards
CAUTION
Circuit boards are susceptible to damage caused by electrostatic discharge, and you must keep this fact
in mind as you handle the circuit boards. Refer to the Comdial publication IMI01-005,Handling Of
Electrostatically Sensitive Components, for general information.  Specific handling precautions are also
included in this installation instruction.
Creating A Static Safe Work Area
When servicing the common equipment cabinet at the installation location, it is a good practice to place a
conductive mat in front of the cabinet area and ground the mat to a good earth ground. (The third wire ground of
the AC power line is also an acceptable grounding point.) The grounded conductive mat provides a safe static
electric discharge path.
When removing the common equipment cabinet from the installation location for servicing, it is a good practice to
prepare a static-safe work area on which to place the cabinet.
You should supply yourself with a static discharge wrist strap, and wear it every time you handle electronic circuit
boards either at the cabinet mounting location or at your work area.
Typical Earth
Ground
Static
Wrist
Strap
ESD Protective
Mat ESD Protective
Mat
ESD Protective
Worksurface
Static 2
Common Point Ground
Creating A Static Safe Work Area
IMI89–255 Installing And Programming The DXPRI Card
18 – Installing Circuit Boards 
						

							Backboard
Earth
Ground 1 Meg Ohm
Resister Conductive
MatStatic Discharge
Wrist Stap Common
Equipment
Cabinet
PLUS034
Providing Static Protection At The Cabinet Mounting Location
Installing And Programming The DXPRI Card IMI89–255
Installing Circuit Boards – 19 
						

							Installing The T1/PRI Line Board
1. Normally you should disconnect the AC power cord from the AC outlet and disconnect the optional battery
back-up assembly from the main cabinet power supply; however, when necessary, you can install a T1/PRI
board in an operating system. If you must do this, connect one end of a standard telephone handset coil cord
to the pre-charge port on the power supply. During step 6, you will connect the other end of this coil cord to
the pre-charge jack on the line board.
2. Install your static discharge wrist strap on your bare wrist; adjust it for a snug fit. Be sure that the strap is
touching bare skin and is not isolated by clothing. Connect the wrist strap cord between the wrist strap and an
AC or earth ground
3. Loosen the retaining hardware and lift the front panel away from the common equipment cabinet.
NOTE: With the common equipment in the installed position, the ground lug on the side of the cabinet is an
appropriate grounding point since it should have a heavy ground wire connected between it and a good
earth ground.
4. Each board is supplied in a static protection bag for safe keeping. When you are ready to install the board,
remove it from its static protection bag.
5. Locate the proper board slot. On DXPPlussystems the T1/PRI board connects to any universal slot.
NOTE: On DXP Plus systems, do not install a T1/PRI board at the right-most board slot in the second (or lower)
expansion cabinet. The system reserves this slot for internal use.
6. If you are installing the board in an operating system, connect the free end of the pre-charge cord that you
installed in step 1 to the pre-charge jack on the line board.
7. Orient the board with its top and bottom guides in main cabinet board cage, and press the board firmly until
its board edge connection properly mates with the connector on cabinet’s backplane. If you connected a
handset cord between the pre-charge port on DXPPluspower supply and the jack on board (as directed in
step 6), disconnect it after installing board.
CAUTION
When pressing circuit boards into place, press them only at the extractor lever locations.
If you apply pressure at other locations you may damage the board assembly.
8. Repeat steps 3 and 4 until all boards are installed.
9. Make a final inspection to ensure that all boards are, oriented correctly and mated properly.
10. Install and tighten the supplied screws to secure the circuit boards to the board cage.Do not neglect this step!
It is important because it helps in providing a protective ground condition for the board thus ensuring RFI
(radio frequency interference) and lightning protection.
NOTE: If you ever find it necessary to field-install a DXPRI card on a T1 board, refer to the paragraph titled,
Up-grading Your DPT1 Board For ISDN–PRI Support, that is located at the end of this publication.
IMI89–255 Installing And Programming The DXPRI Card
20 – Installing The T1/PRI Line Board 
						

							Pre-charge jack
Pre-charge
jack
Pre-charge
jack Universal
board slots
1 - 11
Pre-charge cable for
installation during
power up
Connect board to any
universal board slotUniversal
board slots
1 - 9
Universal
board slots
1 - 10
DO NOT install boards
in last slot on right in
lower expansion cabinet.Static discharge
wrist strap Pre-charge
jack
PLUS011A
Installing The DXPT1 Board In The DXP Plus Cabinet
Installing And Programming The DXPRI Card IMI89–255
Installing The T1/PRI Line Board – 21 
						

							Installing The Services Board Assembly
1. With your static discharge wrist strap still properly installed, install the services board in the main cabinet.
2. If the installation includes a DXOPT–SYN card, make sure the lower (larger) slide switch on the front edge of
the card is in the upAUTOposition. Leave the upper (smaller) switch in either position as it has no effect
when the automatic mode is selected.
3. Orient the services board assembly with its top and bottom guides in main cabinet board cage, and press the
board firmly until its board edge connection properly mates with the connector on cabinet’s backplane.
CAUTION
When pressing circuit boards into place, press them only at the extractor lever locations. If you apply
pressure at other locations you may damage the board assembly.
4. Make a final inspection to ensure that the board assembly is oriented correctly and mated properly.
5. Install and tighten the supplied screws to secure the board assembly to the board cage.
6. If applicable, plug the power cable from the optional external battery assembly into the DXP power supply.
7. Connect the AC power cord to the AC wall outlet and turn the power switch on. If no alarms are on (red
LEDs), and at least one of the greenPRIorSECLEDs is lit, replace the cabinet’s front panel; otherwise,
troubleshoot the installation for errors.
IMI89–255 Installing And Programming The DXPRI Card
22 – Installing The Services Board Assembly 
						

							Static Discharge
Wrist Strap
PRI
LED
SEC
LED
AUTO
MANUAL
SWITCH
(Set to AUTO
Position)
Services Board
PA G E
BGM
MOH
RELAY 1
RELAY 2
RELAY 3
RELAY 4
COMDIAL
OPBD3 OUTMAIN
CABINET
BATTERYOPBD2
ON
=OK STATUSOPBD1
PLUS006
PRI
PRISEC
SEC
UNLOCKED
SOURCEDXOPT
SYN
MODE
MANUAL
AUTOMAN
Installing The Services Board Assembly
Installing And Programming The DXPRI Card IMI89–255
Installing The Services Board Assembly – 23 
						

							Connecting The ISDN–PRI Line To The System
Terminate the end of the ISDN–PRI line with a miniature 8-pin modular plug, and plug it into the main jack on
the front edge of the T1/PRI board.
The T1/PRI board contains a built-in CSU that protects the DXPPlusfrom voltage surges, provides transmission
drive up to 6,000 feet, and performs diagnostic tests for the network. Therefore, a customer-supplied CSU is not
necessary unless your customer requires this addition.
If a direct connection to a repeater is within a few hundred feet, the transmit signal from the T1/PRI board may
overdrive the repeater. Repeaters normally operate best with -7.5 to -23 dB input signals. Arrange LIU switches 2,
3, and 4 to set the transmit signal level (0 dB is default).
IMPORTANT CAUTION
To help ensure that external over-voltage surges do not damage the system, Comdial advisors suggest
that you install a properly-grounded gas discharge tube or a similar primary protection device on the T1
trunk where it enters the building. If the site includes a network interface box, verify that there is standard
lightning protection installed externally to the box on its network side. Primary protection where the
cable enters the building is necessary to prevent a fire hazard inside the building.
Detailing the Cable Requirements
Normally, the ISDN–PRI connection to a central office is via a network interface box (smart jack). The box is
usually small with an 8-pin modular telephone jack for connecting to the customer premise T1 equipment. For
short lengths of approximately 200 feet or less, use a standard telephone cable with an 8-pin modular plug for
connection to the T1/PRI board. Make straight-through connections for pins 1, 2, 4, and 5 when using these plugs
on both ends of the cable.
When spanning distances greater than 200 feet, use a low-capacitance cable (data-grade cable) having two
twisted, solid-conductor wire pairs with shielding. The type of cable with metal shielding covering each twisted
pair provides the best immunity from electrical interference. Only connect the shielding to earth ground at one end
of the cable—do not ground the shielding at the other end of the cable.
IMI89–255 Installing And Programming The DXPRI Card
24 – Connecting The ISDN–PRI Line To The System