Comdial Impact Dsu Instructions Manual

2.16 Checking The System Installation
The system operating features are set to default conditions at initial power-up. These conditions
provide a basic operating system with a known set of parameters, and you should check out the
system with the default conditions in place. At any time while the system is operating, you can
reset default conditions from station port 10 or 12 following the instructions provided in chapter
3,Programming.
2.16.1 Checking The Resistance
Measure the resistance at the station...

2.16.3 Checking The General Operating Conditions
1. Check the red light emitting diode (LED) system status indicator. Be sure that it is on steady.
If it is off or flashing, refer to the paragraph titledChecking the System Status Indicator.
2. Refer to the user’s guide for operating information and perform a general operational test of
the system by exercising the features from station port 10 or 11. Operational parameters are
per the system default conditions as detailed in Chapter 4 until class of...

2.17 Isolating Failures
Section 2.17 will help you to find and identify problems that might occur in the digital telephone
system.
2.17.1 Checking The System Status Indicator
A red LED located on the common equipment cabinet near the music port is the system status
indicator. This indicator light comes on when power is supplied to the system. If the indicator
flashes after power up, it signals that the processor has failed or that the software cartridge is not
installed. Unplug and reconnect the AC power...

2.18 Installing The System Options And Accessories
This section contains information on installing the battery back up, the analog terminal interface,
and the data interface unit.
2.18.1 Installing The Battery Back Up Assembly
Preparing The Battery Back Up Assembly For Use
The factory ships the battery back up assembly with the harness installed in the enclosure. To
complete the assembly, perform the following operations:
·remove the lid from the metal enclosure and save the retaining hardware,
·install...

Figure 2–26: Installing The Batteries
batt1.cdr
IMI66–107Digital Telephone System
Installing The DSU 2 – 55 

Connecting The Battery Back Up Assembly
The common equipment provides an interface connector for the connection of an optional
external battery assembly.
CAUTION
Be sure that the AC power cord is connected to the electrical outlet before connecting an
external battery assembly to the common equipment interface connector. This ensures that
internal protection circuitry is operating to prevent damage that could result from improper
connection.
The external battery assembly provides a minimum of one hour of...

During AC operation, the common equipment provides recharging current to maintain the
voltage potential of the external battery assembly at an operational level. The charging circuit
may not provide an adequate charge if an installed battery assembly has a current rating of
greater than 40 ampere-hours. You should measure the battery assembly voltage every three
months.
For proper backup capabilities, make sure the batteries meet the following specifications:
·With a fully-charged battery assembly...

2.18.2 Installing The Analog Terminal Interface
Introducing The Analog Terminal Interface
The ATI-D is a multipurpose,on-premiseaccessory for the digital telephone system. It has dual
circuits that provide the following features:
·INDUSTRY-STANDARD TELEPHONE (IST) INTERFACE—This feature adapts most
industry-standard telephone (IST) devices to the digital telephone system. The ATI-D will
accept both tone (DTMF) and pulse (rotary) dialing from these devices.
·SYSTEM INTERCONNECTION—This feature allows an...

Detailing The The Analog Terminal Interface Specifications
Power requirements: Supplied by the common equipment
Ringing voltage: 55 VAC Nominal @ 20 Hz
(45 VAC minimum)
Power rated to maximum
REN = 2.0
Battery feed voltage: 24 VDC nominal
Loop current limits between ATI-D
and IST interface: 20 ma min. at 620 ohms
70 ma max. at 0 ohms
DC loop limits from ATI-D to
industry standard interface per port: 620 ohms maximum including interfaced telephony device.
(Approximately 4000 feet with #26 AWG twisted-pair...

Mounting The Analog Terminal Interface
Refer to Section 2.1 at the beginning of this chapter for system mounting considerations that are
also applicable to the analog terminal interface.
Mounting Procedure
1. Unpack and carefully inspect the ATI-D for shipping damage. Notify the shipper
immediately of any damage found. Verify that the package contains all parts and accessories
needed for proper installation and operation.
2. If a backboard is required at the mounting location, attach it securely to...