Comdial Dsu II Digital Telephone System Instructions Manual

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...

Be sure that all of the ground connections are without splices and are visible for inspection and
maintenance. Tag all of the ground connections with a sign that reads:Do Not Remove Or
Disconnect.
If you install expansion modules on the base cabinet, attach at least a #10 or #12 insulated, solid
copper wire between the frame ground stud on the expansion module(s) to the frame ground stud
on the base cabinet.
Remember, if spare conductors exist in the cables that run between the stations and the 66M-xx...

2.4 Connecting The Lines
The line terminations for the common equipment cabinet are standard modular plug/jack
connections. Line configuration must be loop start only. Each modular jack provides termination
for two lines. Modular line jacks 1 and 2 also provide termination for an auxiliary pair in
addition to the two outside lines. The outside line termination can be a type 66M-xx connector
block or individual 6-position modular jacks. The line cord that is routed between the outside
line termination and...

RING 2
RING 1
TIP 1
TIP 2
RING 4
RING 3
TIP 3
TIP 4
RING 6
RING 5
TIP 5
TIP 6
RING 8
RING 7
TIP 7
TIP 8CO/PBX
LINES
Line Terminations
Type 66M-XX
Connector Block
or
Individual 6-Position
Modular jacks
{
{
{
{
(Typical 8-Line, 16-Station
Base Unit Shown)
CAJS083
6-Wire Twisted
Pair Cable
6
5
4
3
2
1
No Conn.
Ring 2
Ring 1
Tip 1
Tip 2
No. Conn.
6
5
4
3
2
1
Aux. Ring
Ring 2
Ring 1
Tip 1
Tip 2
Aux. Tip
Pin designation for
Line Jacks 1 and 2Pin designation for
Line Jacks 5 and 6
Detailing The CO Interface
DSU...

2.4.1 Detailing The Line Connections
The table on the next page shows the line connection details for all three of the common
equipment base units. Jacks one and two are the same for all three cabinets, jacks three and four
are the same for both the J0816 and J1632 cabinets, and jacks five through eight are only
available on the J1632 cabinet.
2.4.2 Reassigning The Line Ports
After you have initially connected a line to a particular line port and programmed its attributes
(or left it with the system...

Understanding The Line Connection Details
Common Equipment Type Line Jack Pin No. Connection Telephone Number
J0408,
J0816,
and
J163211 Auxiliary 1 (Line 2) Tip
2 Line 2 Tip
3 Line 1 Tip
4 Line 1 Ring
5 Line 2 Ring
6 Auxiliary 1 (Line 2) Ring
21 Auxiliary 2 (Line 4) Tip
2 Line 4 Tip
3 Line 3 Tip
4 Line 3 Ring
5 Line 4 Ring
6 Auxiliary 2 (Line 4) Ring
J0816
and
J163231 No Connection
2 Line 6 Tip
3 Line 5 Tip
4 Line 5 Ring
5 Line 6 Ring
6 No Connection
41 No Connection
2 Line 8 Tip
3 Line 7 Tip
4 Line 7...

2.5 Connecting The Stations
The DSU II digital telephone system supports the operation of proprietary Comdial telephones.
The J0408, J0816 and J1632 common equipment supports the installation of up to eight, 16, or
32 telephones, respectively. Add-on expansion modules are available to expand the station
capacity of the systems. You can add one expansion module to the J0408, and two expansion
modules to the J0816 and J1632. The JM408 expansion module provides interface for eight
proprietary stations (plus...

2.5.1 Grounding The Unused Station Cables
Remember, if spare conductors exist in the cables that run between the stations and the 66M-xx
connector blocks, it is good practice to connect them to earth ground. Doing this may help
prevent them from introducing radio frequency and/or AC interference into the system. Also
remember that it is good practice to disconnect any unused station jacks from the connector
block and ground that wiring to earth ground as well.
Remove insulation and twist together all...

16-Line, 32-Station Base Unit
Stations 10-25
Stations 26-41Power Fail Station
(pins 3 & 4)
Grounding
Terminal
4-Line, 8-Station Base Unit
Station 10-17,
Power Fail Station
Grounding
Terminal
Station 10-25
Power Fail Station Grounding
Terminal
8-Line, 16-Station Base Unit
DSU220DSU220
Locating The Station Connections
IMI66–132 DSU II Digital Telephone System
2 – 18  Installing The DSU II Digital Telephone System 

2.5.4 Connecting Stations To The J0408
This table shows the color-coded connections for a J0408 common equipment cabinet.
Connecting Stations To The J0408 Common Equipment Cabinet
25-Pair Connections Two-Wire Connections Station Connections
Wire Color Pair Pin No.Clip
Term.Pair Wire Color Station Location
White-Blue
126 1
Signal PathGreen
10
Blue-White 1 2 Red
White-Orange
227 3
Signal PathGreen
11
Orange-White 2 4 Red
White-Green
328 5
Signal PathGreen
12
Green-White 3 6 Red
White-Brown
429 7
Signal...