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

INSTALLING PCBs
2. PCB Installation
and Startup
2-8 Figure 2-5 Connecting a Modem to LAPBU Module124i System
To install the Remote Programming (LAPBU) Module:
1. Plug the Remote Programming Module into the headers on
the left side of the CPRU PCB as shown in Figure 2-3.
92700 - 16
25 Pin Male-to-Male Connector
(P/N 92268A)Modem625
Modular
Jack9 Pin Male-to-25 Pin 
Female Connector 9 Pin RS-232 Cable
(P/N 92707) 25-Pair
Cable 8 CPRU PCB 
LAPB PCB  8 DSTU PCB 
Station
Cable  66MI-50
Station Block  

2. PCB Installation
and Startup2-9
INSTALLING PCBs
28i System: Central Processing Unit (CPRU)
PCB(Figure 2-6)
Plug the CPRU PCB into the CPRU slot (Slot 1) in the KSU.
The CPRU provides:
The system’s central processing, stored program and memory
for the customer’s site-specific data.
Mode switch for cold (default data) start on power-up.
Reset switch to allow the system to be reset without powering
down.
Battery for short term (14 day) backup of the customer’s site-
specific data.
Music on Hold jumper...

INSTALLING PCBs
2. PCB Installation
and Startup
2-10 To install the 28i system’s CPRU PCB:
1. Insert the battery into the battery clips.
2. Plug the CPRU into KSU CPRU slot (Slot 1).
3. When powering up, hold down the COLD switch on the CPRU.
This ensures that the system will load the default data-
base on initial power-up.
On initial power up(with a cold startup), the system scans for
station ports from the lowest slot to the highest slot, so the first
8 station ports on the 24CPRU are assigned...

2. PCB Installation
and Startup2-11
INSTALLING PCBs
124i System: Central Processing Unit (CPRU)
PCB(Figure 2-7)
Plug the CPRU PCB into the CPRU slot in the Main Cabinet.
The CPRU provides:

The system’s central processing, stored program and memory
for the customer’s site-specific data.


Mode switch for hot (customer data) or cold (default data)
start on power-up.


Battery for short term (14 day) backup of the customer’s
site-specific data.


Music on Hold jumper which allows you to select an exter-...

INSTALLING PCBs
2. PCB Installation
and Startup
2-12 To install the 124i system’s CPRU PCB:
1. Slide the Mode Switch to the Cold position.
This ensures that the system will load the default data-
base on initial power-up. After initial power-up, you
must change the Mode Switch to Hot.
2. Insert the battery into the battery clips.
3. Plug the CPRU into Main Cabinet CPRU slot.
Refer to Part 4, Installing Optional Equipmentfor instructions
on installing Background Music and Music on Hold. 

2. PCB Installation
and Startup2-13
INSTALLING PCBs
Upgrading CPRU Firmware (Figure 2-8, 2-9)
Use these instructions when upgrading the Software EPROMs
on the CPRU PCB. The new EPROMs in the upgrade kit are
static-sensitive components. Be sure to follow the instructions
below carefully. Failure to follow proper anti-static precau-
tions could damage your new software.
To upgrade CPRU Firmware:
1. Attach a grounded wrist strap to your wrist and a grounded
metal object (such as CEU ground).
2. If the...

INSTALLING PCBs
2. PCB Installation
and Startup
2-14 6. Following Figure 2-9, carefully install the new EPROMs.

The EPROMs install in non-consecutive order. Be
sure to install all four EPROMs.
Pay careful attention to line up the notch in each
EPROM with the notch in its socket.
Do not bend any pins when plugging in the
EPROMs.
7. Reinstall the CPRU PCB. If the system has been previously
installed, plug the system back in. Otherwise, continue with
the installation.
8. Store old EPROMs in the anti-static...

2. PCB Installation
and Startup2-15
INSTALLING PCBs
Digital Station (DSTU) PCB (Figure 2-10)
The Digital Station (DSTU) PCB provides DDK connectors for
eight digital telephones, VAU, 3-ACI, 2-DCI, or 2-OPX modules.
To install a DSTU PCB:
1.28i:Plug a DSTU PCB into slot 2 in the KSU (1 DSTU
PCB maximum per system).
124i:Plug DSTU PCBs into slots 1-3 in any installed cabi-
net (nine maximum).
2. Refer to Part 3: Installing Extensions and Trunks for cabling
instructions.
On initial power-up(28i:hold down...

INSTALLING PCBs
2. PCB Installation
and Startup
2-16
T1/PRI (PRIU) Interface PCB (Figure 2-11)
Note:For PRI, please consult with your Nitsuko
Representative for availability.
For T1 and ISDN Primary Rate Interface (PRI) applications,
install a T1/PRI Interface PCB. This PCB has a single 24-channel
circuit which can be configured for either T1 trunks or PRI. The
T1/PRI PCB requires an Advanced Features Module (EXCPRU)
and, for DTMF receivers, a Tone Detector (DTDU) PCB.
If set for T1, the T1/PRI PCB...

2. PCB Installation
and Startup2-17
INSTALLING PCBs


Quad Datasmart DSU
consisting of:
- Quad Datasmart DSU (P/N 85956)
- CSU/DSU DB15M-DB15F Cable (P/N 85952)
- CSU/DSU RJ48-DB15 Cable (P/N 85953)
- T1/PRI Installation Cable (P/N 92067)
The T1/PRI Interface PCB is designed to use the last available
group of 24 consecutive trunks.
To install a T1/PRI Interface PCB:
1. Set the switches on the T1/PRI Interface PCB for either PRI
Mode or T1 Mode.
2. Plug the T1/PRI Interface PCB into slot 3 of any cabinet...