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...

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...

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...

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....

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,...

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...