Comdial Dxp Plus Instructions Manual

3.3 Wiring The Batteries
The charger has a pair of negative wires and a pair of positive wires(designated by red sleeving near one end of
the wires). This two-wire arrangement divides the current carrying load between the two wires of each pair. The
cabinet’s assembly package includes two individual black wires that you use to wire the circuit breaker to the
batteries. Again, two wires divide the current carrying load between both wires.
The negative wires from the charger are terminated with smaller...

#10-32 Machine Screw
Wire Terminal
Battery Terminal
Wire Terminal
#10 Flat Washer
#10 Lockwasher
#10 Hex Nut
bb480i
Attaching The Wiring Hardware
BB480e
Installing The Front Cover
Installing The Switchable Battery Back Up Assembly IMI89–197
Installing The Battery Back Up Assembly – 13 

4.0 Connecting The Battery Back-Up Assembly To The System
1. Connect the AC power and turn on the power supply switch in both DXPPlusmain and expansion cabinets.
CAUTION
Always connect the AC power, and turn on the power supplies before you connect the battery back-up
cables. Using a different connection sequence could cause equipment damage.
2. Connect a battery back-up cable between the charger cabinet and the power supplies in the DXPPlusmain
and expansion cabinets.
3. The battery back-up assembly...

5.0 Verifying The Battery Voltage
Every three months, use an accurate voltmeter to measure the no-load voltage of the battery back-up assembly.
The measured voltage range should be within 27–34.5 volts when the batteries are at full charge.
If the no-load voltage is lower than 27 volts, measure the charging voltage supplied by the common equipment
cabinet. The measured charging voltage must be 35 volts maximum.
If the charging voltage is low or if the voltage of freshly-charged batteries is no greater...

6.0 Special Cautionary Battery Information
·Do not dispose of batteries in a fire as the cells may explode. Check with the local codes for possible disposal
instructions.
·Do not open or mutilate the batteries. Released electrolyte is corrosive and may cause damage to the eyes or
skin. It may be toxic if swallowed.
·Exercise care in handling batteries in order not to short the battery with conducting materials such as rings,
bracelets, and keys. The battery may over-heat and cause burns.
·Charge the...

Troubleshooting The DXPT1 Digital Carrier Transmission Option
On The DXP Plus Digital Communications System
What This Document Contains
1. Defining The T1 Terms   2
1.1 Introducing The DXPT1 6
1.2 Describing The Channel Service Unit (CSU) 6
1.3 Considering Pre-Installation Details 7
2. Troubleshooting The Physical Layer   8
2.1 Selecting Functions With DIP Switches SW1-1 Through SW1-8 8
2.2 Selecting Functions With DIP Switches SW2-1 Through SW2-8 8
2.3 Selecting Functions With DIP Switches LIU-1 Through...

1 Defining The T1 Terms
Bipolar
A bipolar signal is composed of alternating pulses that both represent a digital logic 1. The positive pulse
is a (+) and the negative pulse is a (-). Zero volts represents a space, or digital logic 0.
Bipolar Violation (or error)
A bipolar error is a digital logic 1 (or mark) that has the same polarity as its predecessor.
NOTE: Every time the system regenerates the signal stream, it corrects any bipolar errors; therefore, it
prevents end-to-end error checking from using...

Direct Inward Dial (DID) T1 Trunk
DID is a protocol for inbound calls where the network sends the extension number during the beginning
of the call. The system supports the 0 through 7 inbound digits. The network does not translate the digits
to a valid extension—the system’s DID translation tables perform this action.
DS-0 (Digital Signal-Level Zero)
Digital Signal-Level Zero is a single 64Kbit channel inside a T1 span.
E & M T1 Trunk
E&M is a signalling protocol that supports both inbound and outbound...

Loopback Payload
The loopback payload feature is an ESF-only method of loopback which loops the network receive input
path to the remote T1 equipment’s transmit output path. This loopback method does not loop the first bit
of each frame to allow the DXPT1 board’s facility data link to continue to transmit maintenance
information. You can use switches SW2–7 and SW2–8 to manually initiate the payload loopback or you
can allow the network to send an FDL message to initiate or restore the payload loopback....

Smart-Jack (Network Interface Box)
A smart jack is a demarcation box provided by the central office. A smart jack provides isolation and
increased signal drive (up to one mile) and can respond to loopback commands for diagnostic purposes.
The central office usually provides an 8–pin modular jack for T1 equipment connection. Pin 1 of the
modular jack goes to pin 1 of the DXPT1 modular jack, and so on. Only pins 1 and 2 (DXPT1 receive), 4
and 5 (DXPT1 transmit) require connecting.
Superframe Mode (SF)
The...