Comdial Dxp Correspondance Instructions Manual

							DXP Correspondence ManualInstalling The DXPExpansion Cabinet Power SupplyThe installation of the expansion cabinet power supply is virtually’
identical to that of the main cabinet power supply. One critical
difference between the two, however, is that there is an AC and DC
connection from the expansion cabinet’s power supply to the main
cabinet’s power supply (for more information on the expansion
cabinet power supply, see 
lMI66-086). Both the power cord and the
DC connection from the expansion cabinet run through the access hole
on the bottom of the expansion cabinet and through the hole on the top
on the main cabinet. The AC cord then plugs into the three-pronged
outlet on the front of the main power supply; the DC power cable
connects to the S-pin male connectors on the main and expansion
cabinet’s power supplies.
You should have checked both of your power supply voltages earlier,
so now power-down and continue with your installation (see
IMI66-085 for information on testing the power supplies).
Installing The DXP 3 
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							3.6
Connecting A
Battery BackupThe DXP works with the Comdial BBLDX. Should the AC power
fail, this main battery backup provides a minimum of one hour of
system operation on a 70% loaded system. To guarantee an hour with
an expansion cabinet, you need two battery backups. Comdial ‘has
created a formula whereby you can determine the battery backup time
for your system based on your number of lines and stations (see
IMI89-074). You can install an additional battery backup, or another
manufacturer’s battery backup unit, if you determine that one UPS
won’t provide the backup time needed.
Note that a battery backup may take up to 12 hours to recharge after it
has been completely discharged. You may also need to wait 12 hours
after your initial installation before you have full battery backup
capabilities.
-Remove the lid from the empty metal enclosure and save the
retaining hardware; you should mount the battery backup on
the left or below the main cabinet. Also leave room below the
battery backup to add another assembly in the future.
-Once you have attached the assembly to the wall, slide the
batteries into their cabinet. You have to wire the five batteries
together in series with the supplied cable.
-Now plug in the power cord. Always be sure that the AC
power cord is connected to the electrical outlet and the power
switch is in the “on” position before you connect the external
battery backup to the main cabinet. Having the power
connected ensures that the internal protection circuitry is
operating to prevent damage that could result from improper
connection.
-Check the output voltage of the power supply before you
connect the batteries to the DXP power supply. The output
voltage should be between 34.3 and 34.6 volts; if it’s any
higher, the batteries could overcharge and be damaged. The
measured voltage should be between 27 and 35 volts (see
IMI89-074 for voltage test).
-Disconnect the power cable from the battery backup and
power-down before you move on with the installation. If you
leave the battery backup connected, you will be drawing power
from the battery during the rest of your installation.
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							DXP Correspondence ManualInstalling The DXP3.7
Ins fallingThe
BoardsAs part of your pre-installation work, you will have made sure that all
of your boards were fully functional. So you can now go ahead and
start installing them.
.
When you work with any of the boards, always wear a static discharge
wrist strap and work in a static-safe work area. Do not remove the
board from its static-protected bag until you are in a static-safe area
(for information on electro-static discharge, see 
IMIO1-005, Handling
of Electrostatically Sensitive Components). When installing any board
into the DXP, push only on the tabs on the outer edges of the board.
Board LocationsLabels appear under each slot on the front edge of the cabinets,
indicating which board should go in the slot, and the boards are
mechanically keyed to fit only in the correct slots.
When inserting circuit boards, orient them so that they line up with the
top and bottom guides on the card cage. Keep in mind that the boards
fit snugly into the slots. Slide the boards into the card cage until the
connector on the back edge of the board properly mates with the
connector on the backplane.
If you suddenly encounter resistance while inserting a board into the
card cage, do not try to force the board into place.
Keep in mind that Universal/Auxiliary 1 and Universal/Auxiliary 2 are
the only two slots in the entire system, including the expansion
cabinet, that hold an auxiliary board.
Using The Pre-power jackThe services, CPU, and auxiliary boards all have to be installed with
the power off; line and station boards have pre-power jacks that allow
you to install them while the system still has power. The pre-power
jack is typically for when you are adding board into an existing system
and you don’t want to disturb the customer’s service. If you’re
installing a new system, there’s no need to keep the power on.
If you ever insert a station, line, or interface board while the DXP
system is on, make sure to prepower the board first to prevent a power
surge to the board or to the system. You must prepower the system
before the board makes contact with the backplane.
-Use the standard telephone handset coil cord supplied with the
main cabinet and connect one end of the cord to the prepower
jack on the main cabinet’s power supply unit and the other end
to the prepower jack on the board. Simply making the
connection prepowers the board. The LED on the board will
flash to indicate that the board has been pre-powered.
Installing The DXP 3 
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							installing The DXPDXP Correspondence Manual
Services BoardThe second slot in the main cabinet if reserved for the 
services‘board.You must have the power off to install the services board.
CPU BoardRemember that the CPU board consists of the RAM and Software
cards. Use the supplied 
# 4 machine screws to connect the ILAM card
to the CPU board. The RAM card is connected to the CPU board by
using the supplied screws and washers. A 64-pin DIN connector
connects the CPU board to the RAM card.
The Software card is connected to the RAM card with the supplied
lockwashers and machine screws. Signals pass between the RAM card
and the Software card through a 64-pin, dual, in-line connector.
Once you have attached the RAM and Software cards to the CPU
board, insert the entire assembly into the correct slot in 
the card cage.
Make sure DIP switch 8 is in the “on” position. Then power up the
system and check the status light on the CPU board. If it lights without
flashing, power off and move on.
Interface BoardsThe first slot in the cabinet, moving from left to right, is for the
Interface 1 board (DXINM). The interface 1 board buffers the signals
sent from the main cabinet to the expansion cabinet. The expansion
cabinet interface board 
(DXINX) mounts in the first slot in the
expansion cabinet. The slot for the interface 1 board is smaller than
any of the other card-cage slots. The interface board is the only
half-sized board that inserts directly into the backplane. The interface
boards are connected with a 64-pin ribbon cable.
Station BoardsYou can install a station board in any universal slot in either cabinet.
The DXP automatically numbers stations according to the station
board location; the number designations move from left to right, and
from the main cabinet to the expansion cabinet.
Each station board uses either one or two 
25pair amphenolconnectors to go from the station board to the station punch-down
block. Each station board has a pre-power jack that allows a technician
to service the board while the systemstill has AC power on. (for more
information on the Station boards, see 
IMI66-085.)3 
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							DXP Correspondence ManualInstalling The DXPLine BoardsYou can install a line board in any universal slot or in the four.
dedicated line slots; note that Unlike the station board designations,
the line slots are numbered from right to left. Each line board also has
a pre-power jack that allows a technician to service the board while
the system still has AC power on. The connection of the line board
depends upon the type of line board (for information on the wiring of
line boards, see 
IMI66-085).
Auxiliary BoardYou can install two auxiliary boards in the DXP, but you can 
onlyinstall them in the two Universal 
/ Auxiliary slots of the main cabinet.
The option cards include the 
DTMP Tone card, DXOPT-TON, the
communications card, DXOPT-COM, and the 
Tl sync. card,
DXOPT-SYN. You can only install the DXOPT-COM card on the
lower two slots of the auxiliary board. These cards mount onto the
auxiliary board, much like the RAM and software cards mount onto
the CPU board.
Conference BoardYou can install a conference board (DXCNF) in any universal or
universal 
/ auxiliary slot, and you can install multiple conference
boards. The conference board also has a pre-power jack that allows a
technician to service the board while the system still has AC power on
(for more information on the Conference board, see 
IMI66-085).Installing The DXP 3 
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							3.8.IWhen you do any work with telephone lines, always adhere to the
Connecting Thefollowing safety guidelines:
Lines 1-Never install telephone wiring during a lightning storm.
-Never install telephone jacks in a wet location unless the jack
is specifically designed for wet locations.
- Never touch uninsulated telephone wires or terminals unless
the telephone line has been disconnected at the network
interface.
-Use caution when installing or modifying telephone lines.
The telephone company’s “demarcation block,” commonly referred to
as the 
RJ21X, is usually a 66-type connector block or a series of
individual 4-position modular jacks. You must place your own
specialized 66-block next to the demarcation block and connect them
with 
# 24 gauge wire. Before you run line cables to the cabinet, use a
telephone test-set to check each CO line for a dial tone.
Always take thorough notes about line locations and types; you will
need all of this information later when you connect your peripheral
equipment and program your lines and line groups. Good records are
essential too if we need to come back later and make line changes or
move lines.
Surge ProtectionThe telephone company usually offers a basic protection against the
possibility of transient voltage spikes traveling through the lines, but
that protection usually only guards the CO circuits and not the DXP.
In order to fully protect your lines, install and properly ground
primary surge protection on all lines. Comdial recommends that you
use gas-discharge tubes, but any similar line-protection device will
suffice. Once all of the lines are connected from the demarcation
blocks to the 66 blocks, it’s a good idea to mount another series of
66-blocks; these blocks will connect directly to the 
DXP’smultipurpose line boards. Having the connections to the DXP and to
the demarcation blocks separated by another 66-block allows you to
move the lines easily without having to alter the wiring scheme from
the CO or to the DXP.
IMI66-085 provides a diagram illustrating the line connections; it
shows the connections in relation to the 25-pair 
amphenol connector.
When you are wiring your lines, keep in mind that ground start lines
are polarity sensitive.
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							3.9
Connecting The
Stations1  Station connections, like line connections, are typically through66M-xx connector blocks. The station boards, like many of the line
~  boards, are also connected through 
25pair male amphenol connectors.
While the station boards have protection against shorts, it’s better to
~  punch down the wiring with the power off.
Both IST devices and digital stations are two-wire connections, but
you should skip space on the IST block to avoid crosstalk. With digital
signals, crosstalk isn’t a problem. The polarity on the wires isn’t
important for either the digital or IST stations.
If your station cables must cross over fluorescent lights, the cables
should cross the lights at a 
go-degree angle to diminish the effect of
the magnetic field that builds up around the lights. You should also
make sure that the wires are elevated at least two feet above the light.
If the telephone wire runs near a light that is fluttering, you may
encounter some interference, so make sure any such light is replaced
before you continue.
Station WiringUse the same approach to station connections as you did with your
lines; connect each station board to a 66-block, again using both sides
of the block. Then cross connect that 66-block to another 66-block
that will be connected to the house wiring. This dual connection
makes moving any of your stations much easier since you don’t have
to change any of the wiring to the station boards or to the house
wiring. If you are running any station wire outside the building, be
sure to provide extra surge protection on the station cables.
The maximum total distance allowed from the common equipment to
the stations is 1500 feet for multiline telephones, using # 24 gauge
twisted pair cable, and 3000 feet for industry standard telephones
using 
# 24 gauge, twisted pair cable (see section 1.8 of this manual for
more cabling information). If you have any spare conductors on the
cables between the 66-blocks and the station jacks, it is a good
practice to connect them to earth ground to help prevent them from
inducing radio frequency and 
/ or AC interference into the system.
lnstaiiing The DXP 3 - 7 1 
						

							Installing The DXPDXP Correspondence Manual
3.10
Testing The
StationsPower up the DXP and take a voltage measurement across each signal
pair on the type-66 station block. The appropriate voltage
measurements are also shown on charts in 
IMI66-085.To test the stations, plug in the digital station and check to see that the
LCD appears (if applicable). Once the LCD comes up, perform a
station self-test:
-unplug the telephone,
-press and hold the 1 key as you plug the telephone back in
(mute key on analog, such as 
ExecuTech, telephones).
-If all of the LEDs light in sequence and the telephone rings, the
station is working.
-Finally, seize an intercom line and make a call. Complete the
call to make sure that you have two-way communication.
Make sure that any Scout 
9OOMX digital wireless telephones are all
fully charged before you place them in service. Also check your
industry-standard telephones. Plug the station in, and make sure 
thatyou hear a dialtone. Make sure that the IST stations ring when called,
to ensure that the ring generator is working properly.
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							3.11
Connecting An
External Paging
DeviceYou can connect a paging device either to the paging port on the
Services board or to a line port. The line port can be used to couple a
station’s voice path to an external paging device. Any station with the
line appearance can use the PA system by selecting the line; IST
stations can use the amplifier by dialing a line-group access code.
When the paging device is connected to a line port, users can speak
through or dial DTMF tones or pulses to the external device through
the PA device, depending upon the type of paging device.
Connect the voice pair (tip and ring) leads of the line dedicated as an
auxiliary port to the audio input of an external paging amplifier. You
will have to program the line as an auxiliary line in programming.
Make sure to consult the installation manual of the paging device for
any requirements or specifications beyond those of the DXP.
installing The DXP 3 - 13 
						

							installing The DXPDXP Correspondence Manual3.12
Connecting A
ModemThe DXP has its own proprietary modem, product number DXMDM,
so installation is simple. You can use a non-proprietary modem, but
using the modem designed for the DXP is a good idea. The modem
installs next to the power supply in the main cabinet. All that’s
involved in the hardware connection is attaching the mounting screw
to the card cage. The top jack on the modem is for the line cord, and
the bottom jack is for the serial data connection. You can connect the
modem to any available serial data port on DXP. The power cord from
the modem attaches to the 
precharge port on the power supply. We’ll
set the Dip switch 7 to the ON position because the modem depends
upon the DXP for its power and configuration, and with switch 7 on,
the system automatically sends the initialization string to the modem
in case of a power failure or system reboot.
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