Comdial Dxp Plus Instructions Manual

4. Identify the expansion cabinet slots where you will install the DXPT1 boards and the primary and secondary
(if available) CO line supplier. With this knowledge, designate one DXPT1 board as primary and another
DXPT1 board as secondary by placing straps on the services board and setting DIP switches on the expansion
cabinet interface board.
(a)If you install one DXPT1 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...

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

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

5.2 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...

Static Discharge
Wrist Strap
PRI
LED
SEC
LED
AUTO
MANUAL
SWITCH
(Set to AUTO
Position)
Services Board
PAGE
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 The DXPT1 Line Board IMI89–193
Installing The DXPT1 Line Board – 25 

6.0 Understanding The T1 Alarms And Indicators
Most of the T1 alarms and indicators (LEDs) are located on the front-edge panel of the DXPT1 board, while
several are located on the front edge of the DXOPT-SYN card. The following sections discuss the alarms and
indicators.
NOTE:Red /Yellow LEDs, when lit, indicate errors or non-standard configuration for normal operation.
Red Alarm (red LED)When this LED indicator is lit, the system cannot establish communications with
the network.
Yellow Alarm (yellow...

Cyclic Redundancy
Check (red LED)When using the ESF format, the cyclic redundancy check (CRC) indicator lights
whenever there is a discrepancy in the check sum received for an incoming frame
from the originating system and the locally calculated check sum. This
discrepancy indicates a data error in the received frame. The CRC is enabled by
DIP switch SW2-4.
Slip  (red LED)This indicator is turned on whenever a frame slip is detected. This is caused by
the transmit clock not being synchronized with the...

6.1 Viewing The DXPT1 Board Alarms And Indicators
LED*LABELERROR OR STATUS CONDITION WHEN LED IS LIT
l(Status) Rapid flash = defective board
Steady on = board in wrong slot or board constraints violated
Off with repeated five second blink on = normal operation
(T1 trunk idle)
On with repeated five second blink off = normal operation
(T1 trunk busy)
lRed Communications with network cannot be established
(out-of-service)
¤Yellow Disruption in remote T1 service
lSync Loss of sync with the incoming signal...

Services Board
Status
Red
Yellow
Sync
Signal
Blue
Bipolar
CRC
Slip
Unlock
B8ZS/COFA
Remote Loopback
Local Loopback
Payload Loopback Primary
Secondary
Unlocked
Status
Manual
DXOPT-SYN
Card
Diagnostic Switches
and LEDs for Factory
Use OnlyDXPT1 Board
PLUS007
Viewing DXPT1 And DXOPT–SYN Alarms And Indicators
Installing The DXPT1 Line Board IMI89–193
Installing The DXPT1 Line Board – 29 

7.0 Understanding Installer/User
Information Regarding FCC Rules and Regulations
This electronic key system complies with Federal Communications Commission (FCC) Rules, Part 68. The FCC
registration label on the DXP Plus contains the FCC registration number, the ringer equivalence number, the
model number, and the serial number or production date of the system.
7.1 Notification To Telephone Company
Unless a telephone operating company provides and installs the system, the telephone operating company...