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...

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...

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...

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...

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...

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...

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. 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....