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Comdial Dxp Plus Instructions Manual

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    							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 
    						
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