Nitsuko Portrait 824 Hardware Manual

Section 3
Installing Extensions and Trunks
In this section. . . Page
Connecting Blocks  . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Working With DDK Connectors  . . . . . . . . . . . . . . . . . . .3-3
Making Additional DDK Connectors  . . . . . . . . . . . . . . .3-3
Punching Down a DDK Installation Cable  . . . . . . . . . . .3-4
Connecting Extensions . . . . . . . . . . . . . . . . . . . . . . . .3-7
Station Connections  . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7...

3-2
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Working With DDK Connectors
The system uses DDK-type connectors for extensions, trunks and
optional equipment. Using the optional DDK Installation Cables (4-
pin station cable=P/N 82490, 2-pin power failure cable=82491, and
2-pin C.O. line cable=82492) makes it easy to connect the PCBs to
standard 66M1-50 connecting blocks. The cables available for the
system are for CO lines (one-pair), keysets (2-pair), and Power
Failure Jumpers/auxiliary options (one-pair). If desired, separate
DDK connectors without...

CONNECTING BLOCKS
Figure 3-1  MAKING DDK CONNECTORS
Punching Down a DDK Installation Cable
The DDK Installation Cables have 4-pin DDK connectors installed
on one end and are unterminated on the other. 
1.For each 66M1-50 block, punch down the DDK Installation
Cable in standard color-code order.
Refer to Figure 3-3 if you need help with the color code.
2.After you have punched down your cables, route them through
the bottom of the cabinet and secure them with the strain relief
bar (Figure 3-2).
3-4
Upper...

CONNECTING BLOCKS
Figure 3-2  SECURING THE CABLES
3-5
82400 - 29
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3-6
CONNECTING BLOCKS
Figure 3-3  CONNECTING BLOCK
- Only CPUNo Connection
- With one
expansion PCB
- With two
expansion PCBsT
R
H
L= Tip
= Ring
= High
= Low
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3-7
Station Connections (Figure 3-4)
The CPU has 4-pin DDK connectors for eight stations. Each
Expansion (2CO/8STA) PCB provides for an additional eight sta-
tions. Two Expansion PCBÕs are allowed per system providing a
total of twenty-four stations per system.
Refer to Part 4: Installing Optional Equipment for instruc-
tions on connecting a power failure telephone.
Figure 3-4  STATION CONNECTIONS
1.Following the conventional color code, insert the DDK connec-
tors into the PCB. For example, the first...

3-8
CONNECTING EXTENSIONS
3.For each keyset, run two-pair 24 AWG station cable from the
cross-connect block to the modular jack. For each single line
phone, run one-pair 24 AWGstation cable from the cross-con-
nect block to the modular jack.
4.Terminate the station cable to the module jack lugs:
WHT-BLU to GREEN lug
BLU-WHTto RED lug
WHT-ORN to BLACK lug  *
ORN-WHTto YELLOWlug  *
*  Lug not used when installing a single line phone.
5.Back at the MDF, run two pairs of cross-connect wires (or one
pair of...

3-9
CONNECTING EXTENSIONS
Figure 3-6  CONNECTING SINGLE LINE TELEPHONES
625
Modular
Jack
Single Line 
Telephone
BLK YEL
REDGRN BLU-WHT
WHT-BLU
One-Pair Cross-Connect
DDK 
Connector
25-Pair DDK
Installation CableB BlockCross
Connect
Block
82400 - 48
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3-10
CONNECTING TRUNKS
Trunk Connections (Figure 3-7)
The CPU has 2-pin DDK connectors for four loop start COtrunks.
Each Expansion (2CO/8STA) PCB provides an additional two CO
trunk connections. Two Expansion PCBÕs are allowed per system
providing a total of eight trunks per system.
Refer to Part 4: Installing Optional Equipment for instruc-
tions on connecting a power failure telephone.
Figure 3-7  TRUNK CONNECTIONS
1.Following the conventional color code, insert the DDK connec-
tors into the PCB. For...