Comdial Dxp Correspondance Instructions Manual

							1.8
Identifying
The Station
BoardsStation boards provide the interface for connecting the cables from
telephone stations to the DXP. You can use a station board in
Universal slots 1 through 5 in the main cabinet and universal slots 6
through 11 in the expansion cabinet. The DXP accepts digital, analog,
and industry standard telephones. In order to use these different types
of stations, you must install the correct station board. The following
list explains each station board.
The stations are labeled on the front of the cabinet; note that the
station designations go from the left to the right.
For more information on the Station boards, see 
lMI66-085.Analog Station Board
The analog station board provides support for Comdial’s proprietary
analog telephones (such as the various 
ExecuTech models). Each
board supports either 8 or 16 stations and uses either one or two
25-pair 
amphenol connectors to go from the station board to the
station punch-down block. A precharge port is provided for board
removal or insertion without system power-down. The light on the
front of the station board indicates the board’s status of operation. If
the light is steady-off with a five-second blink rate, all of the station
ports are idle; if the light is steady-on with a five-second blink rate, at
least one station port is busy. Both steady-on and steady-off indicate a
board malfunction, and a rapid flash indicates a malfunctioning
micro-processor.
Digital Station Board
The digital station board provides support for Comdial’s proprietary
digital telephones (such as the Impact and 
DigiTech). Each board
supports either 8 or 16 stations and uses either one or two 25-pair
amphenol connectors to go from the station board to the station
punch-down block. A precharge port is provided for board removal or
insertion without system power-down. The light on the front of the
station board indicates the board’s status of operation. If the light is
steady-off with a five-second blink rate, all of the station ports are
idle; if the light is steady-on with a five-second blink rate, at least one
station port is busy. Both steady-on and steady-off indicate a board
malfunction, and a rapid flash indicates a malfunctioning
micro-processor.
introducing The DXP I- 9 
						

							Industry Standard Telephone Board
The industry-standard station board provides support for.
industry-standard telephones. Each board supports either 8 or 16
stations and uses either one or two 25pair amphenol connectors to go
from the station board to the station punch-down block. A 
prechargeport is provided for board removal or insertion without system
power-down. The light on the front of the station board indicates the
board’s status of operation. If the light is steady-off with a five-second
blink rate, all of the station ports are idle; if the light is steady-on with
a five-second blink rate, at least one station port is busy. Both
steady-on and steady-off indicate a board malfunction, and a rapid
flash indicates a malfunctioning micro-processor.
NOTE: Remember that you will need a ring generatorfor each
cabinet that has any IST stations. You also will need a
DTMF receiver card 
ifyour site requires more than two
simultaneous dialing paths.Wiring The Stations
The following chart details the wiring requirements for all of the
different stations.
Digital Telephone
Analog Multiline Telephone
Analog Single-Line Proprietary
Telephone
Industry-Standard Telephone
2500Feet2000Feet1500Feet
2500Feet2000Feet1500Feet
4000Feet
3500Feet3000Feet
4000Feet
3500Feet3000Feet
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							DXP Correspondence Manual
Introducing The DXP1.9
Identifying
The Line BoardsLine boards provide the interface for connecting the central office, or
CO, lines to the DXP. You can use a station board in Universal slots 1
through 5 in the main cabinet, universal slots 6 through 11 in the
expansion cabinet, and line slots 1 through 4 in the main cabinet (you
can only install a 
Tl board in the second line slot or the fifth universal
slot of the main cabinet, or in universal slot 8 or 12 in the expansion
cabinet). While line boards are optional, it’s rare that you will have an
application that won’t require CO lines. The DXP supports several
different types of line boards,
l Loop start,
l Multipurpose,
lDirect Inward Dialing, or DID,
l and 
Tl.Make sure that the lines coming from the CO match the line boards
that you install in the DXP. Having a 
Tl board does not mean you
have 
Tl lines, for example. Be sure to coordinate with your CO before
you plan your line configurations. Special software may be required to
support certain line boards. Your class instructor will give you further
details on software requirements when you take the classroom portion
of the training.
Like the station boards, each line board has a pre-power jack that
allows a technician to service the board while the DXP still has AC
power.The status light on each line board indicates when a line is in use: off
with a five-second blink rate on indicates that all lines are idle; on
with a five-second blink rate off indicates at least one busy line. A
rapid flash indicates a malfunctioning microprocessor on the line
board. All line boards provide secondary surge protection; Chapter
Three discusses secondary and primary surge protection.
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Line Boards-Loop-start Line Board
The loop-start line board (DXPCO-LP8, LP4) supports loop start
lines, and it is available in either a four- or eight-port capacity. Each
loop-start line board has modular jacks that provide connections for
either four or eight lines. You can connect an industry-standard
telephone to the bottom jack to serve as a power-failure telephone. If
the DXP should lose power, the power-fail telephone will continue to
operate. The LED on the front of the board indicates when a line is in
use: off with a five-second blink rate on indicates that all lines are
idle; on with a five-second blink rate off indicates at least one busy
line. A rapid flash indicates a malfunctioning microprocessor on the
line board. Each loop-start board also has a power fail and auxiliary
interface. For more information on the loop start board, see
IMI66-085.Line Boards-Multipurpose Line Board
The multipurpose line board 
(DXPCO-GDS, GD4) supports loop start
lines, ground start lines, or E and M tie lines. Like the loop start board,
the multipurpose board also is available in either a four- or eight-port
capacity, and you can use any combination of the three line types.
However, ports three and four on each multipurpose board are the
only ports that support E and M tie lines. The LED on the front of the
multipurpose board functions exactly like that on the loop start board;
each multipurpose board also has a power fail and auxiliary interface.
For more information on the multipurpose board, see 
IMI89-097.
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							DXP Correspondence Manual
introducing The DXP
Line Boards-T1 Board
The Tl board (DXPTl) provides 8, 16, or 24 channels of voice
transmissions over a single four-wire cable using multiplexing
techniques. You can install a maximum of four 
Tl boards, two in each
cabinet, but you can only install a 
Tl board in the second line slot or
the fifth universal slot of the main cabinet, or in universal slot 8 or 12
in the expansion cabinet. You can configure the 
Tl board with a
combination of loopstart, ground start, DID, and E 
& M Tie lines.
When you take the DXP classroom training, you’ll get a more
in-depth overview of the 
Tl board. For more information on the Tlboard, see 
IMI89-141.Line Boards-DID Board
The DID board (DXPCO-DD8, DD4) lets, stations have their own
telephone number without having a separate line dedicated to that
station. The basic idea of DID is this: the central office sends digits to
the DXP, which interprets the digits and routes the call to the
appropriate station. For example, you can have fifty stations and only
ten DID lines, and each station can still have its own published
telephone number. However, only ten of the stations can be on calls at
one time. DID lines are incoming only, so if you need outward dialing,
you’ll need more than just DID lines. Like 
Tl , DID will be covered
more deeply in the classroom portion of this training. For more
information on the DID board, see 
IMI89-103.introducing The DXP 1 
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							1.10
Using The
Auxiliary Board
and Add-On
CardsThe auxiliary board is an all-purpose “mother board” that
accommodates up to four smaller option cards. You can install two
auxiliary boards in the DXP, but you can only install them in the
Universal 
/ Auxiliary slots of the main cabinet. The option car&include the DTMF Tone card, DXOPT-TON, the communications
card, DXOPT-COM, and the 
Tl sync. card, DXOPT-SYN. These
cards mount onto the auxiliary board, much like the RAM and
software cards mount onto the CPU board.
While you can install a station, line, conference, or auxiliary board
into either universal 
/ auxiliary slot (first two slots next to the CPU
board), we recommend that you try to leave at least one of these slots
for an auxiliary board, even if you don’t need an auxiliary board now,
you may want to expand the system later. Remember, these are the
only two slots in the entire system that will accept an auxiliary board.
Use the line slots and universal slots for line and station boards before
you use a universal 
/ auxiliary slot.
DTMF Tone Card
The DTMF tone card expands the 
DXP’s industry-standard dialing
capability: without a tone card, only two industry-standard telephones
can dial out of the DXP simultaneously. Each DXOPT-TON card
provides four more IST dialing paths. So if you are going to have
several IST telephones, it’s a good idea to install a tone card to make
sure that more than two of them can dial-out simultaneously. You can
install four tone cards on each auxiliary board (see 
lMI89-078, IST
Installation Instructions, for more information).
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							DXP Correspondence Manual
introducing The DXP
Communications Card
The auxiliary board also supports the communications card.
(DXOPT-COM); the DXP has two serial data ports on the CPU
board. Each communications card provides four additional serial data
ports; you may need these ports for additional PC Attendants or
printers, for example. Keep in mind that the two serial ports on the
CPU board are the only two true-high-speed ports. Depending upon
system traffic, the serial ports on the 
comm. card may not operate at a
true 9600 baud rate. You can install up to two corn-cards on each
auxiliary board, but you must install them on the bottom two slots of
the auxiliary board. For more information on the Corn. card, see
IMI89-124.Synchronization Card
Finally, the DXOPT-SYN, or sync. card, adjusts the DXP 
Tl transmit
frequency to match the frequency received from the central office or
master DXP. You only need a sync. card if you are using the Tl
board, and you can only install one sync. card into the DXP. If your
Tl board is connected to the C.O., you must have a sync. card. If you
have two 
DXPs connected together with the Tl configured as E & M
tie lines, only one DXP must have a sync. card. For more information
on the sync. card, see 
IMI89-141.Introducing The DXP 
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							Introducing The DXPDXP Correspondence Manual
1.11
Using
The Conference
BoardThe DXP services board provides for a limited amount of
conferencing. If additional conferencing is required, you may need to
install a conference board (DXCNF). Each conference board provides
five additional three-way conferencing circuits. You can install a
conference board in any universal or universal 
/ auxiliary slot, and you
can install multiple conference boards. For more information on the
Conference board, see 
lMI66-085.
1.12 1The expansion cabinet is very similar in design and function to the
In trocfucing
The Expansionmain cabinet. The main cabinet holds 12 boards, and the expansion
cabinet holds up to eight additional boards. As its name indicates, the
expansion cabinet simply increases the number of stations and lines
Cabinet 1that you can have on the DXP system.
The far left of the cabinet houses the expansion-cabinet power supply;
this power supply is designed specifically for the expansion cabinet.
Chapter three discusses the power supply in more detail. The
backplane and card cage are very similar to those in the main cabinet.
This first slot holds the interface 2 board. The interface 2 board
connects to the interface 1 board to secure the integrity of the digital
signals between the two cabinets. You must have an interface 2 board
if you are going to use an expansion cabinet. The remaining slots in
the expansion cabinet, universal slots 6 
- 12, each can hold either a
line, conference, or station board. You cannot use an auxiliary board
in the expansion cabinet. For more information on the expansion
cabinet, see 
IMI66-086.1 
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							DXP Correspondence ManualIntroducing The DXP1.13
Concluding
Chapter OneThe DXP is comprised of a series of mandatory and optional
printed-wire boards: the power supply, CPU and Services boards are
mandatory for system operation, as are the Software and RAM cards.
The line boards, station boards, auxiliary boards, and conference
boards are optional depending upon your application.
Before you go any further in this series complete the study at the end
of this chapter. By now, you should have a general understanding of
the function and capabilities of the DXP hardware, printed-wire
boards, and expansion cabinet; if you aren’t secure in your knowledge
of any of these, rewind Tape One and watch it again; then reread
Chapter One.
Introducing The DXP 1 
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							Introducing The DXPDXP Correspondence Manual
Chapter One1.
ReviewWhat does the term “modular design” mean?
Questions
I
2.If a client wants the maximum number of lines on his or her
system, the maximum number of lines is
and the
maximum number of stations is
3.If a client wants the maximum number of stations on his or her
system, the maximum number of lines is
and the
maximum number of stations is
4.The number of lines and stations on a DXP is dependent upon
what?
5.The DXP main cabinet holds a maximum of 20 boards; True
or False?
6.The DXP can use any modem that supports the correct baud
rates; True or False?
7.How long will a DXP battery backup provide operation to the
DXP in the event of a power failure?
8.Is the interface board ever mandatory? If so, when? If not, why
not?
9.What is the maximum number of Interface boards that you can
install in a system?
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