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

3. Installing
Extensions and Trunks3-3
INSTALLING 25-PAIR CABLES
Installing Trunk Cross-Connect Blocks
It is also recommended to install cross-connect blocks for each
of the systems major trunk device groups.  Cross-connect
blocks provide an easy way to troubleshoot, determine port
identification numerically, and determine trunk port utilization.
All major trunk port devices must be bridged from the
RJ21X to trunk cross connect blocks in groups of eight (16
pins).  Each 24FU trunk filter unit interfaces...

3. Installing
Extensions and Trunks
3-4
INSTALLING EXTENSIONS
Key Extension Cabling (Figure 3-2)
Each key extension requires one-pair twisted station cable from
the MDF to the modular jack.  A maximum of 48 extensions
can be installed per 50-pin connector on each 48FU filter unit.
To connect key station cabling:
1. Punch down one pair 24 AWG station cable for each key
telephone to a cross-connect block.
2. Run one-pair cross-connect from the cross-connect block to
the extension (B) block for each...

3. Installing
Extensions and Trunks3-5
INSTALLING SINGLE LINE TELEPHONES
Single Line Extension Cabling
Each single line extension requires one-pair twisted station
cable from the MDF to the modular jack.  A maximum of 48
extensions can be installed per 50-pin connector on each 48FU.
A 90-105 VAC ring generator must be connected to the Main
Cabinet to provide ringing to single line sets.
To connect station cabling:
1. Punch down one pair 24 AWG station cable for each single
line telephone to a...

3. Installing
Extensions and Trunks
3-6
EXTENSION CUTDOWN SHEET
Extension Cutdown Sheet Configuration 
(Figure 3-4 and 3-5)
Due to the inherent flexibility of the universal PCB slot configura-
tion, standard cutdown sheets for extension cabling do not apply.
Note:The order that the extension PCBs (8/16ASTU, 16DSTU)
are installed determines the assigned extension number.
For example, given that a 16DSTU is installed in slot #1 and
uses extension numbers 301-316, if three 16D/ASTU PCBs
were installed in...

3. Installing
Extensions and Trunks3-7
EXTENSION CUTDOWN SHEET
Figure 3-4  EXTENSION CUTDOWN SHEET
Figure 3-5  SAMPLE EXTENSION CUTDOWN SHEET 
CONN
PIN
48 FU
CN4 48 FU
CN1
CN1BLOCK
TERMCOLOR
CODEPCB
ID FUNCTION26
1
27
2
28
3
29
4
30
5
31
6
32
7
33
81
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16WHT-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
PLACE
STICKER
HERE
16 DSTU LOWER Station Block
B1
B1 48 FU1EXP 1 MAIN
MAIN EXP 2
48 FU2
48...

3. Installing
Extensions and Trunks
3-8
INSTALLING CO/PBX LINES
Ground Start/Loop Start Line Cabling
Ground start trunks/loop start lines must be bridged from the
telco RJ21X to a line cross-connect block (A).  Each
ground/loop start CO/PBX line requires one-pair cross-connect
cable from the RJ21X to the line (A) block.
The A block connects to the 24FU filter unit with a 25 pair
cable.  The line (A) block(s) should be arranged in groups of 8
lines (16 pins) to correspond to the 24FU PCB, filter cable...

3. Installing
Extensions and Trunks3-9
INSTALLING CO/PBX LINES
Figure 3-6  TYPICAL TRUNK/LINE INSTALLATION
Figure 3-7  INSTALLING GROUND START
TRUNK/LOOP START LINES
24FU PCB Bridging Clips 8 Loop
Start
Lines
8 Ground
Start
Trunks
8 Loop
Start
LinesOne-Pair
Xconnect
Filter Cable8ATRU-LS1
8ATRU-LSI
8ATRU-LS1GSAU
92000 - 207
CN1RUN
BLK
CN1RUN
BLK
CN1RUN
BLK
Line
A Block Telco
RJ21X
25-Pair
Cable
Loop Start
Lines 1-8
Loop Start
Lines 17-24 Ground Start
Trunks 9-16
Bridging Clips
Bridging Clips8 Loop
Start...

3. Installing
Extensions and Trunks
3-10
INSTALLING DID TRUNKS
DID Trunk Description
Direct Inward Dialing trunks must be bridged from the telco RJ21X
to a line cross-connect (A) block.  Each DID Trunk requires one-
pair cross-connect from the RJ21X to the line (A) block.
The A block connects to the 24FU filter unit with a 25-pair
cable. The line (A) block should be arranged in groups of 4
DID trunks (8 pins) to correspond with the 24FU PCB, filter
cable, and cabinet slot equipped with a 4ATRU-LD1....

3. Installing
Extensions and Trunks3-11INSTALLING TIE LINES
Tie Line Description
Tie lines (Type I E&M 4-conductor) must be bridged from the telco
RJ21X to a line cross-connect (A) block. Each tie line requires two-
pair cross-connect from the RJ21X to the line (A) block.
The A block connects to the 24FU filter unit with a 25-pair
cable. The line (A) block must be arranged in groups of 4 tie
lines (16 pins) to correspond with the 24FU PCB, filter cable,
and cabinet slot equipped with a 4ATRU-EMI....

3. Installing
Extensions and Trunks
3-12
LINE/TRUNK CUTDOWN SHEET
CO/PBX Line Cutdown Sheet Configuration
(Figures 3-10 and 3-11)
Due to the flexibility of the system universal PCB slot configu-
ration, standard cutdown sheets for CO/PBX line cabling do not
apply.
Note:The order in which the 8ATRU PCBs are installed
determines the assigned line circuit number.
For example, if four 8ATRUs are installed in the Main Cabinet
in the following order, the following numbering plan would be
in effect:
To...