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

							PCB INSTALLATION
2. PCB Installation
and Startup
2-18
CDTU Description
The CDTU-A PCB provides:
- 16 DTMF receiver/dialtone detection circuits
- Conference circuits to allow 4 four-party or 2 eight-party
conferences
- One PCB status LED
The CDTU-B PCB provides:
- 16 DTMF receiver/dialtone detection circuits
- One PCB status LED
The CDTU-C PCB provides:
- Conference circuits to allow 4 four-party or 2 eight-party
conferences
- One PCB status LED
CDTU Installation (Figure 2-15)
1. Install the CDTU into any slot.
Figure 2-15  CDTU INSTALLATION
92000 - 31
Conference/DTMF
Reference (DTU) PCB
Status LED
(Normally flashing) 
						

							2. PCB Installation
and Startup2-19
PCB INSTALLATION
4PFTU Description
When commercial power fails, the 4PFTU automatically
bridges four lines from an 8ATRU to a designated 48FU PF
block.  The PF block must be equipped with single line tele-
phones.  One 4PFTU can be installed per cabinet.
Note:When a PFTU PCB is installed, ground start operation
cannot be used.
4PFTU Installation (Figure 2-16)
To install the 4PFTU PCB:
1. Remove the filter cable from the 8ATRU PCB to be
equipped with the 4PFTU (if necessary).
2. Remove the 8ATRU from the cabinet (if necessary).
3. Remove the 3 jumper straps from the CN4 connector on the
8ATRU.
4. Install the 4PFTU on the 8ATRU.
5. Install the 8ATRU into the cabinet.
6. Connect the 4PFTU filter to the corresponding 48FU filter
unit.
7. Install the filter cable from the 8ATRU to a 24FU.
8. Install a single line set to each power failure output on the
48FU filter unit.Figure 2-16  4PFTU INSTALLATION
92000 - 59
Power Failure Card 
						

							PCB STARTUP
2. PCB Installation
and Startup
2-20
Initial PCB Installation
When first installing the system:
1. Insert the CPRU PCB into the CPU slot.
2. Insert the software disk into the CPRU PCB.
3. Insert a 16DSTU PCB in slot 1 of the Main Cabinet.
4. Power up the system.
5. Set the run/block switch UPon the DSTU in slot 1.
6. After setting the run/block switch DOWN for all
ASTU/DSTU PCBs, insert ASTU/DSTU PCBs in the Main
Cabinet in sequential order.
The order that 8ASTU/16ASTU and 16DSTU PCBs are
physically inserted determines the numbering plan.The
installer must install extension PCBs in order (ie; slot 1 first,
slot 2 next, slot 3 next, etc.) for a sequential numbering plan.For example, with a 16DSTU in slot #1 (ext. 301-316),
when 3 more 16DSTU PCBs are installed in the following
order, the numbering plan below would apply:
7. Set the run/block switchUPon each PCB. 
						

							2. PCB Installation
and Startup2-21
PCB STARTUP
Initial Installation of Trunk PCBs
When first installing the system:
1. Set the run/block switchDOWNon all 8ATRU, 4ATRU-
EM, or/4ATRU-LD PCBs.
2. Insert all other ATRU PCBs in sequential order.  The
installer must install trunk PCBs in order (ie; slot 5 first,
slot 6 next, slot 7 next, etc.) for a sequential numbering plan
The order that 8ATRU PCBs are physically inserted
determines the numbering plan.For example, if four
8ATRUs are installedin the following order,the numbering
plan below would apply:
3. Set the run/block switch UP on each ATRU PCB.
Installing 4ATRU-EMI or 4ATRU-LD PCBs
The order in which the 4ATRU-EMI or 4ATRU-LD1 PCBs
are installed determines the assigned line circuit number.
Installing a 4ATRU-EMI or 4ATRU-LD in slot 7 first provides
tie lines or DID circuits 1-4.
For example, if four 4ATRU-EMI or 4ATRU-LDs are installed
in the following order, the numbering plan below would apply: 
						

							INSTALLING FILTER UNITS
2. PCB Installation
and Startup
2-22
48FU Filter Unit Description
The 48FU filter unit provides:

Six 16-pin connectors for CPRU, ASTU, DSTU, and PGDU
connection


Two 50-pin amphenol-type connectors for extension, auxil-
iary equipment, and page/door box/alarm connection
Note:Only internal devices may be connected to this connector.
48FU Installation (Figures 2-17 and 2-18)
1. Install a 25-pair cable(s) into the 48FU amphenol connector(s).
2. Secure the 25-pair cable(s) using a tie wrap.
3. Insert the 48FU into the appropriate slot on top of the cabi-
net.  Push the 48FU down onto the plastic standoffs.
4. Install filter cables to CPRU, DSTU, ASTU, and PGDU
PCBs as needed.
Figure 2-17  TYPICAL 48FU INSTALLATION
92000 - 51
Close ejector tabs
before inserting
through slots.Insert tab
into slot. 
						

							2. PCB Installation
and Startup2-23
INSTALLING FILTER UNITS
Removing a 48FU (Figure 2-18)
1. Remove all filter cables from the 48FU.
2. Remove amphenol cables from the 48FU.
3. Pinch the plastic standoff on each side of 48FU using
needlenose pliers.
4. Pull the board gently off the standoffs and out of the cabinet.
Figure 2-18  48FU FILTER CABLE INSTALLATION
4PGDU PCB48FU PCB
Ribbon CableFerrite Bead
92000 - 161 
						

							INSTALLING FILTER UNITS
2. PCB Installation
and Startup
2-24
24FU Filter Unit Description
The 24FU filter unit provides:

Three 16-pin connectors for 8ATRU, 4PFTU, 4ATRU-EM,
or 4ATRU-LD connection


One 50-pin amphenol connector for CO/PBX line
connection
24FU Installation (Figures 2-19 and 2-20)
1. Insert the 24FU into the appropriate slot on top of the cabi-
net. Push the 24FU down onto the plastic standoffs.
2. Install a 25-pair CO/PBX line cable into 24FU amphenol
connector.
3. Secure the 25-pair cable using a tie wrap.
Note:When a 24FU filter unit must be installed or removed,
use needlenose pliers to pinch the plastic standoff on each side
of 24FU, and pull the board gently off the standoffs and out of
the cabinet.
Figure 2-19 TYPICAL 24FU FILTER UNIT INSTALLATION
92000 - 55
Close ejector tabs
before inserting
through slots. Insert tab
into slot. 
						

							2. PCB Installation
and Startup2-25
INSTALLING FILTER UNITS
4. Install filter cables to 8ATRU, 4PFTU, 4ATRU-EM, and
4ATRU-LD PCBs as needed.
Figure 2-20  24FU FILTER CABLE INSTALLATION
8ATRU PCB24FU PCB
Filter CableFerrite Bead
92000 - 160 
						

							3. Installing
Extensions and Trunks3-1
Section 3, INSTALLING EXTENSIONS AND TRUNKS
In this section . . .
Page
Installing DID Trunks  . . . . . . . . . . . . . . . .3-10
DID Trunk Description . . . . . . . . . . . . . . . . . 3-10
Installing DID Trunks . . . . . . . . . . . . . . . . . . 3-10
Installing Tie Lines  . . . . . . . . . . . . . . . . . .3-11
Tie Line Description . . . . . . . . . . . . . . . . . . . 3-11
Installing Tie Lines . . . . . . . . . . . . . . . . . . . . 3-11
Line/Trunk Cutdown Sheet  . . . . . . . . . . .3-12
CO/PBX Line Cutdown Sheet Configuration 3-12
In this section . . .
Page
Installing 25-Pair Cables  . . . . . . . . . . . . . .3-2
Installing 25-Pair Cable Guides . . . . . . . . . . . 3-2
Routing 48FU 25-pair Cables . . . . . . . . . . . . . 3-2
Routing 24FU 25-pair Cables . . . . . . . . . . . . . 3-2
Installing Extension Cross-Connect Blocks . . . 3-2
Installing Trunk Cross-Connect Blocks . . . . . . 3-3
Installing Extensions  . . . . . . . . . . . . . . . . . .3-4
Key Extension Cabling . . . . . . . . . . . . . . . . . . 3-4
Installing a Key Telephone . . . . . . . . . . . . . . . 3-4
Installing Single Line Telephones  . . . . . . . .3-5
Single Line Extension Cabling . . . . . . . . . . . . 3-5
Installing a Single Line Telephone . . . . . . . . . 3-5
Extension Cutdown Sheet  . . . . . . . . . . . . . .3-6
Extension Cutdown Sheet Configuration. . . . . 3-6
Installing CO/PBX Lines  . . . . . . . . . . . . . .3-8
Ground Start/Loop Start Line Cabling . . . . . . 3-8
Installing Ground Start Trunks/Loop 
Start Lines . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8 
						

							3. Installing
Extensions and Trunks
3-2
INSTALLING 25-PAIR CABLES
Installing 25-Pair Cable Guides (Figure 3-1)
The Main Cabinet is equipped with two 25-pair cable guides on
the right side.  When installing a single cabinet system, remove
the 25-pair cable guide and screws on the top right side and
install it on the lower left side of the Main Cabinet.
Each Expansion Cabinet is equipped with one 25-pair cable
guide on top of the right side.  The first Expansion Cabinets
cable guide should remain as is.
Remove the second Expansion Cabinets cable guide and screws
and install on the top left side of the first Expansion Cabinet.
Routing 48FU 25-pair Cables(Figure 3-1)
It is recommended to install extension blocks to the left of each
cabinet to allow access to 48FU filter units, 25-pair cables, fil-
ter cables, and extension PCBs for expansion or troubleshoot-
ing.  Run 25-pair cables from 48FU filter units over plastic pro-
tectors on the left side of the cabinet and through 25-pair cable
guides on the lower left side of the cabinets.
Routing 24FU 25-pair Cables (Figure 3-1)
It is recommended to install trunk blocks to the right of eachcabinet to allow full access to 24FU filter units, and 25-pair
cables, filter cables, and PCBs for expansion or troubleshoot-
ing.  Run 25-pair cables from 24FU filter units over plastic pro-
tectors on the right side of the cabinet and through 25-pair cable
guides on the lower right side of the cabinets.
Installing Extension Cross-Connect Blocks
It is also recommended to install cross-connect blocks for each of
the systems major extension port device groups (16 pins).
Cross-connect blocks provide an easy way to troubleshoot, deter-
mine port identification numerically, and determine port utiliza-
tion.
All major extension port devices must be bridged from the
cross-connect blocks to station (B) blocks in groups of eight
(16 pins). Each 48FU trunk filter unit interfaces with 8ASTU,
16ASTU, or 16DSTU extension PCBs using a 16-pin filter cable.
Install cross-connect blocks for the following 48FU interfaces:
- All digital extension circuits
- CPRU functions (ie; BGM, MOH, Night mode switch, relay 1)
- External page
- External alarms
- Data devices