Nitsuko 24i/28i/124i/384i Hardware Manual

3. Installing
Extensions and Trunks
3-2CONNECTING BLOCKS
Working With DDK Connectors
The system uses DDK type connectors for extensions, trunks
and optional equipment. Using the 25-pair DDK Installation
Cables (P/N 93090) that came with your system makes it easy
to connect the PCBs to standard 66M1-50 connecting blocks. In
general, each cabinet needs:

One 66M1-50 block and DDK Installation Cable for exten-
sions and optional equipment.


One 66M1-50 block and DDK Installation Cable for trunks....

3. Installing
Extensions and Trunks3-3CONNECTING BLOCKS
Figure 3-1  PUNCHING DOWN DDK INSTALLATION
CABLESFigure 3-2  SECURING  Figure 3-3  SECURING
THE CABLES ON THE 28i THE CABLES ON THE 124i
926 - 47
66M1-50
Connecting 
Block WHT-BLU
BLU-WHT
WHT-ORN
ORN-WHT
WHT-GRN
GRN-WHT
WHT-BLU
BLU-WHT
WHT-ORN
ORN-WHT
WHT-GRN
GRN-WHT
926-38 

3. Installing
Extensions and Trunks
3-4CONNECTING BLOCKS
BLOCK
TERMCOLOR
CODEFUNCTION 25-PAIR CABLE
926 - 39
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
41
42
43
44
45
46
47
48
49
50 31
32
33
34
35
36
37
38
39
40WHT-BLU
BLU-WHT
WHT-ORN
ORN-WHT
WHT GRN
GRN-WHT
WHT-BRN
BRN-WHT
WHT-SLT
SLT-WHT
RED-BLU 
BLU-RED 
RED-ORN 
ORN-RED 
RED-GRN 
GRN-RED
RED-BRN
BRN-RED
RED-SLT
SLT-RED
BLK-BLU
BLU-BLK
BLK-ORN
ORN-BLK
BLK-GRN
GRN-BLK
BLK-BRN
BRN-BLK
BLK-SLT
SLT-BLK
YEL-BLU...

3. Installing
Extensions and Trunks3-5
CONNECTING EXTENSIONS
Digital Station (DSTU) PCB Connections (Figure 3-5)
The Digital Station PCB has DDK connectors for eight stations. 
Figure 3-5  DIGITAL STATION CONNECTIONS
1. Following the conventional color code, insert the DDK con-
nectors into the PCB. For example, the first DSTU in the
system would have these connections:
Extension Port DDK Conn Pair
301 1 WHT-BLU / BLU-WHT
302 2 WHT-ORN / ORN-WHT
303 3 WHT-GRN / GRN-WHT
304 4 WHT-BRN / BRN WHT
305 5...

3. Installing
Extensions and Trunks
3-6
CONNECTING EXTENSIONS
Digital Station (DSTU) PCB Connections (Cont’d)
5. Back at the MDF, run one pair of cross-connect wire
between the pins on the B block and cross-connect block to
complete the connection.
6. Install bridging clips as required.
7. After completing step 6, you should be able to place and
answer calls at the extension.
8. Record your entries on Figure 3-4.
Figure 3-6  CONNECTING DIGITAL TELEPHONES
625
Modular
Jack
25-Pair DDK
Installation Cable...

3. Installing
Extensions and Trunks3-7
CONNECTING EXTENSIONS
Analog Station (ASTU) Connections(Figure 3-7)
The Analog Station PCB has DDK connectors for four sta-
tions. The 28i system allows for a maximum of 2 ASTU’s to
be installed. On a 124i system, the maximum allowed is either
15 ASTU PCB’s with a DSTU PCB installed in slot 1, 2, or 3
(providing 60 analog station ports and 8 digital station ports)
OR16 ASTU PCB’s with no DSTU PCB installed in the sys-
tem (providing 64 analog station ports). Note:...

3. Installing
Extensions and Trunks
3-8
CONNECTING EXTENSIONS
Analog Station (ASTU) Connections(Cont’d)
5. Back at the MDF, run one pair of cross-connect wire
between the pins on the B block and cross-connect block to
complete the connection.
6. Install bridging clips as required.
7. After completing step 6, you should be able to place and
answer calls at the extension.
8. Record your entries on Figure 3-4.
Figure 3-8  CONNECTING ANALOG TELEPHONES
625
Modular
Jack
25-Pair DDK
Installation Cable
BLK YEL...

3. Installing
Extensions and Trunks3-9CONNECTING TRUNKS
Analog Trunk (ATRU) PCB Connections(Figure 3-9)
The Analog Trunk PCB has DDK connectors for four loop start
CO trunks and a power failure telephone.
Refer to Part 4: Installing Optional Equipment for
instructions on connecting a power failure telephone.
Figure 3-9  ANALOG TRUNK CONNECTIONS1. Following the conventional color code, insert the DDK con-
nectors into the PCB. For example, the first ATRU in the
system would have these connections:
Trunk...

3. Installing
Extensions and Trunks
3-10CONNECTING TRUNKS
Analog Trunk (ATRU) PCB Connections(Cont’d)
4. After completing step 3, you should be able to place and
answer calls over the connected trunk.
5. Record your entries on Figure 3-4.
Figure 3-10  CONNECTING ANALOG TRUNKS
25-Pair Cable
to Central Office
25-Pair DDK
Installation CableTelco
RJ21X One-Pair
Cross Connect
A
Block
926 - 46 

3. Installing
Extensions and Trunks3-11CONNECTING TRUNKS
Tie Line Trunk (2EMTU) PCB Connections(Figure 3-11)
The Tie Line PCB has DDK connector for two 2-wire (Type 1)
(4-conductor), two 2-wire Type 2 (6 conductor), four 4-wire (4
conductor) tie line trunks.
1. Following the conventional color code, insert the DDK con-
nectors into the PCB. For example, the first 2EMTU PCB in
the system would have these connections:
Trunk DDK Connector Pair
1 WHT-BLU / BLU-WHT / WHT-ORN / ORN-WHT
2 WHT-GRN / GRN-WHT /...