Comdial Dxp Plus Instructions Manual

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
Installing The DXPT1 Line Board IMI89–193
Installing The DXPT1 Line Board – 11 

4.1 Connecting The T1 Trunk
Terminate the end of the T1 trunk with a miniature 8-pin modular plug, and plug it into the main jack on the front
edge of the DXPT1 board.
The DXPT1 board contains a built-in CSU that protects the DXP Plus from 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...

T1003A
Front View of Main Connector
On DXPT1 Board
No connections are allowed
to pins 7 or 8. (Issue 2 boards
ONLY.) NOTE:
1R1
RC1
ReceiveC1
Transmit
T1
T 2
3
4
5
6
7
8
Connecting The TI Trunk To The DXPT1 Circuit Board
Installing The DXPT1 Line Board IMI89–193
Installing The DXPT1 Line Board – 13 

4.2 Detailing The T1 Cable Requirements
Normally, the DXPT1 board 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
(DXPT1). For short lengths of approximately 200 feet or less, use a standard telephone cable with an 8-pin
modular plug for connection to the DXPT1. Make straight-through connections for pins 1, 2, 4, and 5 when using
these plugs on both ends of the...

4.3 Understanding The DXP Plus Logical Numbering
Because there are no dedicated station or line ports in the DXPPlus, the system uses an automatic configuration
method to logically number its stations and lines. Automatic configuration occurs after you perform a master clear
on the system.
How automatic configuration works
With automatic configuration, the system does a search for all installed station and line boards in the main and
expansion cabinets, and assigns a logical number for each provided...

5.0 Installing The Syncronization Card
On The Services Board
Whenever you install one or more DXPT1 boards, and the DXP Plus is receiving its timing signals from an
external source, you must install one synchronization card (DXOPT–SYN) on the services board using the
following procedure.
NOTE: Whenever you install one or more DXPT1 boards, and the DXP Plus is receiving its timing signals from
an external source, you must install one synchronization card (DXOPT–SYN) on the services board. When
you connect...

Installing The Synchronization Card On The Services Board
Installing The DXPT1 Line Board IMI89–193
Installing The DXPT1 Line Board – 17 

5.1 Configuring The Services and Interface Boards
The DXP Plus extracts clocking information from the central office (CO) that supplies the T1 lines, and routes
this information to the DXOPT–SYN sync card. The sync card uses this clocking information to derive the
synchronizing signal for the DXPT1 board’s transmit clock signal. Therefore, the DXPT1 board’s transmit clock
is slaved to the CO supplying the T1 lines. If there is only one CO supplier, that source is the primary clock
source; however, if...

5.1.1 Summerizing the Strapping
DXPT1 Cabinet LocationServices Board Strap
PRIMARY or SECONDARY*Expansion Cabinet Interface Board
Switch Setting SWA or SWB**
Main –UNV1 A
Main–UNV2 B
Main–UNV3 C
Main–UNV4 D
Main–UNV5 E
Main–UNV6 F
Main–UNV7 G
Main–UNV8 H
Main–UNV9 I
Upper Expansion–UNV1 J or K 1
Upper Expansion–UNV2 J or K 2
Upper Expansion–UNV3 J or K 3
Upper Expansion–UNV4 J or K 4
Upper Expansion–UNV5 J or K 5
Upper Expansion–UNV6 J or K 6
Upper Expansion–UNV7 J or K 7
Upper Expansion–UNV8 J or K 8...

5.1.2 Setting The Strapping
Configure the services and interface boards by performing the steps in the following process.
1. 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
NOTE: With the common equipment in the installed position, the ground lug on the side of the cabinet is an
appropriate grounding point...