Comdial Dsu II Digital Telephone System Instructions Manual

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...

batt1.cdr
Installing The Batteries
DSU II Digital Telephone System IMI66–132
Installing The DSU II Digital Telephone System 2 – 61 

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 (ATI-D)
The ATI-D is a multipurpose,on-premiseaccessory for the DSU II 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...

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...

10 15/16
2 3/8
7 3/16
11 3/16
5 5/8
11
Outline Dimensions
(In Inches)Spacing For
Mounting Hardware
(In Inches)
AW139
Detailing The ATI Dimensions
DSU II Digital Telephone System IMI66–132
Installing The DSU II Digital Telephone System 2 – 67 

Connecting The Analog Terminal Interface
Connect the ATI-D per the diagram detailed on the following page. A grounding wire is not
required for operation; however, one is desirable for decreasing radio frequency interference and
electrostatic discharge susceptibility. The ATI-D housing provides a frame ground stud for this
purpose. Connect a #10 or #12, insulated, solid copper wire between this ground stud and a
reliable earth ground.
NOTE: You must connect both station ports to the ATI-D, even if you...

Common Equipment Jack
PIN 1      No Connection
PIN 2      Odd Station (Tip)
PIN 3      Even Station (Tip)
PIN 4      Even Station (Ring)
PIN 5      Odd Station (Ring)
PIN 6      No Connection
Line Jack
PIN 1 No Connection
PIN 2 IST 2 (Tip)
PIN 3 IST 1 (Tip)
PIN 4 IST 1 (Ring)
PIN 5 IST 2 (Ring)
PIN 6 No Connection
6
5
4
321
PIN Locations On
Jacks - Front ViewEarth
Ground
(Optional)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
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39
40
41
42
43
44...