Comdial Dsu II Installation Manual

Installing The DSU II Digital
Telephone System
SectionTitle ...........................................................................................................Page
2.1 Considering the Mounting Requirements................................................2–4
2.1.1 Tools And Hardware ..............................................................................2–5
2.1.2 Underwriters Laboratories Installation Notice .......................................2–5
2.1.3 Hybrid Installation...

SectionTitle ...........................................................................................................Page
2.6 Installing DSS/BLF Consoles ..................................................................2–26
2.7 Connecting A Power Failure Station......................................................2–28
2.8 Using The Auxiliary Equipment Interface ............................................2–29
2.9 Common The Audible And Auxiliary Ringing Interface .....................2–30
2.9.1...

SectionTitle ...........................................................................................................Page
2.16 Isolating Failures ......................................................................................2–51
2.16.1 Checking The System Status Indicator .................................................2–51
2.16.2 Testing The Stations .............................................................................2–51
2.17 Loading And Up-Grading The System Software...

2.1 Considering The Mounting Requirements
The following requirements will help you to install the DSU II digital telephone system.
·Locate the equipment cabinet within four feet of an AC electrical outlet dedicated
exclusively to the use of 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).
·Mount the common equipment within 25 feet of the TELCO/PBX jacks. The recommended
nominal distance is 7 feet.
·Choose a secure...

2.1.1 Tools And Hardware
You will need the following tools and materials to install the common equipment.
·Fasteners—wood screws (1/4 x 1-inch round head), toggle bolts, or wall anchors,
·Screwdriver—to match fasteners,
·Electric drill—if prepared holes are required,
·Connecting tool—for fastening wires to a type-66 connector block,
·Crimping tool—for 623-type modular plugs,
·Volt/Ohm Meter.
2.1.2 Underwriters Laboratories Installation Notice
Per The Underwriters Laboratories standard 1459, 2nd edition,...

2.2 Mounting The Cabinet
After thoroughly reviewing Section 2.1 and fully understanding its subject matter, use the
following procedure to mount the common equipment cabinet
1. Unpack and carefully inspect all equipment for shipping damage. Notify the shipper
immediately of any damages that you find.  Verify that the packages contain all parts and
accessories needed for proper installation and operation.
2. If the mounting location requires a backboard, attach it securely to provide a stable mounting...

DSU250.CDR
4.54
3.78
3.78
16.50
16.50
16.50
27.58
27.5821.30
0.88 0.87
26.65 26.25 20.50
Back of
16-Line, 32-Station
Base UnitBack of
8-Line, 16-Station
Base Unit
Back of
4-Line, 8-Station
Base Unit
4-Line, 8-Station Base Unit
8-Line, 16-Station Base Unit
16-Line, 32-Station Base Unit
0.88
Detailing The DSU II Cabinet Dimensions
DSU II Digital Telephone System IMI66–132
Installing The DSU II Digital Telephone System 2 – 7 

2.3 Making The AC Power Connection
You must employ a dedicated 117VAC 15 AMP circuit, with a third-wire ground, supplied to a
standard electrical outlet (NEMA 5-15R) for the AC power connection.
·For added equipment protection, connect a plug-in power line surge protector between the
power cord and the AC outlet.
·Thoroughly check out the installation before connecting the power cord to an electrical
outlet to apply AC power to the system.
2.3.1 Identifying The Fuses
The system is protected against short...

Typical
earth
groundGrounding
terminalPlug-in power
line surge
protector (typical) Dedicated 117VAC
15 AMP NEMA 5-15R
electrical outlet
with third-wire ground
Fuse
(See text)
DSU211
Making The AC Power Connections
DSU II Digital Telephone System IMI66–132
Installing The DSU II Digital Telephone System 2 – 9 

2.3.2 Grounding The System
If spare conductors exist in the cables between the station and the 66M-xx connector blocks, it is
good practice to connect them to an earth ground. Doing this may help prevent them from
inducing radio frequency and/or AC interference into the system. It is also good practice to
disconnect any unused station jacks from the connector block and ground that wiring to an earth
ground as well.
Transient voltage spikes, if induced onto CO or CENTREX lines, can travel through the...