Comdial Dxp Plus Instructions Manual

							3.6 Using The Modem
The modem is a general-purpose, *Hayes TM compatible, 300, 1200, and 2400 automatic baud detect
serial modem. The CPU board provides a dedicated serial data port and power port for the modem. If
you connect the modem to a serial data port on one of the communications cards, you will have to
program the system for modem operation on that port.
*Hayes is a registered trademark of Hayes Microcomputer Products.
SERIAL
Status
PWR
Line
PLUS013
Power
Cord
Serial Port
Cord
Figure 8: Modem
GCA40–130 DXP Plus General Description
18 – Reviewing The Hardware 
						

							3.7 Using The Ring Generator
The DXPPlusdigital communications system supports the use of industry-standard
telephones (IST).  To use ISTs, the system requires a ring generator assembly to supply ringing voltage
and message waiting voltage to the industry-standard telephones.
Regardless of the number of installed industry-standard telephones, you will need to install one ring
generator assembly in each common equipment cabinet that has IST telephones connected.
Power Supply
Assembly Ring Generator
Assembly
Ring
Generator
Cable
Power
Cable
PLUS030
Figure 9: Ring Generator
DXP Plus General Description GCA40–130
Reviewing The Hardware – 19 
						

							3.8 Understanding The Board Configuration
Physical vs.
Logical board
locationThe DXPPlususes two distinctions for station and line locations: the physical
location and the logical location.
Thephysical locationcorresponds to the order of the universal slots in the
system; these physical slot locations never change. There are a possible 30
physical slot locations in the DXP
Plus(nine slots in the main cabinet, eleven
slots in the upper expansion cabinet, and ten slots in the lower expansion
cabinet–see figure 10 for physical board locations), and no matter what board
you install in the first universal slot of the main cabinet, for example, that slot is
always physical slot one. The physical slot numbers begin with the first universal
slot in the main cabinet and move from left to right. The first universal slot in the
upper expansion cabinet is physical slot number 10, and the first universal slot in
the lower cabinet is physical slot 21. Installers need to know the physical location
of the boards in order to properly wire the lines and stations.
Thelogical locationof a station or a line corresponds to its relationship to the
other stations or lines in the system and is not dependent upon the board’s
location in the cabinet. Therefore, if you have installed your first station board
into the fifth slot of the main cabinet, for example, the system still refers to the
first station on that board as logical station one (station one always defaults with
intercom 1001).
PLUS067
Physical Slots 10 –20
Physical Slots 1 –9
Physical Slots 21 –30
Figure 10: Physical Board Locations
GCA40–130 DXP Plus General Description
20 – Reviewing The Hardware 
						

							How automatic
configuration
worksBecause there are no dedicated station or line ports in the DXPPlus,the system
uses an automatic configuration method to number the lines and stations. When
you master clear the system, it automatically searches for all installed line and
station boards in the main and expansion cabinets. Once the system has identified
the board type and location, it automatically numbers the ports on every installed
board (see the section below, “How the system renumbers logical ports,” for more
information on renumbering).
How the system
renumbers
logical portsThe automatic renumbering configuration, which renumbers thelogicalports,
begins at the left-most universal slot in the main cabinet and proceeds left to right.
When the system has configured all of the boards in the main cabinet, it moves to
the upper expansion cabinet and continues searching from left to right. Finally,
the system searches the lower expansion cabinet, again from left to right, until it
has numbered all of the lines and stations. When the configuration is finished, the
line and station ports are numbered logically from left to right in each cabinet
throughout the system.
Adding boards
without
renumberingWhen you install additional boards or relocate existing boards after the system is
in service, the logical numbers of the stations or lines on the added board
continue from the last assigned logical number. For example, if your last assigned
station number was 16, the next station number will be 17, regardless of the
board’s physical slot.
After you remove and delete a board through programming, that board’s logical
ports are available for reassignment. So an added or relocated board would then
take the logical port numbers from the removed board and not from the end of the
logical sequence. For example, if you had 64 stations and were to remove a
station board that had held logical stations 1–16, the next station board that you
installed would occupy logical station ports 1–16 and not ports 64–80. If you
were to remove an 8-port board and replace it with a 16-port board, the first eight
ports on the new board would replace the original eight logical port numbers, and
the remaining eight ports would begin with the last assigned logical port. So using
our same scenario, the new 16-port board would have logical ports 1–8 and
64–72.
DXP Plus General Description GCA40–130
Reviewing The Hardware – 21 
						

							3.9 Mounting Considerations
When installing the DXPPlusdigital communications system, take note of the following requirements
(figure 11 shows the mounting dimensions):
NOTE: The following instructions describe how to mount the main cabinet using a backboard;
however, you can mount the cabinet on a standard 23–inch equipment rack if you wish.
·Always choose a secure and dry mounting location that has plenty of ventilation. Be sure that the
temperature range of the location is within 32-122 degrees F (0-50 degrees C) and that the
humidity is less than 90 percent, non-condensing.
·Locate the equipment within four feet of a proper AC electrical outlet dedicated exclusively to
this equipment. The outlet must be a 117 VAC 15 AMP circuit with a third-wire ground
supplied to a standard electrical outlet (NEMA 5-15R)
·Locate the equipment within 25 feet of the TELCO/PBX jacks—this is an FCC requirement. A
nominal distance of seven feet is ideal.
·Use a reliable earth ground—a metal cold water pipe or a metal building frame ground.
·Use a backboard of at least 3/4-inch thick plywood to mount the DXPPluscommon equipment.
It is a good practice to make this backboard large enough to accommodate the main cabinet, the
expansion cabinet, and a battery backup assembly even though the initial installation may not
require all of this equipment.
·Always bridge underlying wall studs with the backboard and drive the attaching hardware
through the backboard and through the underlying wall into the wall studs. Allow space
between the top and bottom of the main cabinet for later placement of an expansion cabinet
above the main cabinet.
GCA40–130 DXP Plus General Description
22 – Reviewing The Hardware 
						

							22 5/16
Expansion
Cabinet 1
Panel
Retaining
Screws
Panel
Retaining
Screws
Panel
Retaining
Screws Typical Backboard
48 X 96 3/4 Plywood Sheet
Main
Cabinet
Expansion
Cabinet 2 12 3/4
10 1/2
10 1/2
10 1/2
10 1/2
10 1/2
10 1/24 3/4
4 3/4 48
PLUS024
Figure 11: Mounting The Cabinets
DXP Plus General Description GCA40–130
Reviewing The Hardware – 23 
						

							3.10 Using The Power Supply
What the power
supply doesEach cabinet in the DXPPlussystem has its own power supply. The power
supply provides + and – 5 VDC operating power for the circuit boards and – 36
VDC for all of the telephone stations. Each power supply is located in the top
right corner of the respective cabinet (see figure 12 for power supply locations).
Power supply
requirementsFor the AC power connection, employ a dedicated 117VAC 15 AMP circuit, with
a third-wire ground, supplied to a standard electrical outlet (NEMA 5-15R).
Remember, this electrical outlet must be located within four feet of the common
equipment cabinet. You must supplytwodedicated electrical outlets, each
protected by its own circuit breaker, if you plan to install expansion cabinets.
CAUTION
The dedicated AC circuit for the expansion cabinets must be different from the dedicated AC
circuit that you provide for the main cabinet.
Where
to connect the
power supplyIf you install the optional battery back-up assembly, you can use the main
cabinet’s electrical outlet to supply AC power to that assembly’s battery charger.
To provide protection against surges and spikes that may appear on the AC line,
install a plug-in power line surge protector between the AC power cord of the
installed equipment and the AC outlet.
The common equipment cabinet employs a fan-cooled electronic switching power
supply (ensure that the fan can always provide unobstructed air flow for cooling).
During operation, power supplies of this type generate an audible sound from
their switching regulators. This sound is normal and is not an indication that the
power supply is operating improperly.
CAUTION
DO NOT attach or secure the line cord to the surface of the mounting location in any manner.
GCA40–130 DXP Plus General Description
24 – Reviewing The Hardware 
						

							Plug-In
Power Line
Surge Protectors
Typical Earth
Ground Power
Cable
Two Dedicated
117 VAC 15 Amp
NEMA 5-15R
Electrical Outlets
With Third Wire
Ground
(Each Is Protected
By Its Own Circuit
Breaker.)
PLUS038
Two 15 AMP
Circuit Breakers
Ganged Together
Figure 12: Power Connections
DXP Plus General Description GCA40–130
Reviewing The Hardware – 25 
						

							3.11 Using The Battery Backup
What the battery
backup doesShould the AC power to the system be interrupted, one external battery assembly
provides 1.0 hour of operation for a fully loaded system (for information on
battery backup time using expansion cabinets, see the section below,“How to
calculate battery backup time”).
During AC operation, the external battery assembly accepts re-charging current to
maintain the voltage potential of its batteries at an operational level. The
measured voltage the battery backup is 34.5 volts when the batteries are fully
charged.
Battery backup
componentsYou can only install one battery backup per system. The battery backup
assembly includes the following items:
·Batteries: Five 6-volt, 50 ampere-hour, (Comdial product code BT000-141),
charger unit and interface cables.
·Metal enclosure with wire harness, includes combination circuit breaker,
on/off switch.
How to
calculate
backup time
Calculate the minimum battery backup time provided by a battery backup
assembly to a fully configured DXP
Plussystem using the following formula:
T= Back-up time in hours
K  =0.85 (Constant)
e= 50 (ampere-hour capacity of battery backup assembly)
N= Total number of stations
Example:
Assume that you have installed a DXPPluswith three cabinets supporting 472
telephones and containing one line board along with a battery backup assembly to
provide back-up power.
NOTE:The external battery assembly requires a maximum of 10 hours to completely re-charge to full potential
after it has been completely discharged and, in some cases, when initially installed.
T=Ke
1 + [(0.084) (N)]
T=(.82)(50) 41.0
1 + [(0.084) (472)]=
40.65=1.0 Hour
GCA40–130 DXP Plus General Description
26 – Reviewing The Hardware 
						

							Figure 13: Battery Backup Connections
PLUS004
Circuit Breaker
Power Line
Surge Protector
Dedicated
AC Outlet
DXP Plus General Description GCA40–130
Reviewing The Hardware – 27