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

4. Optional
Equipment
4-10
NIGHT MODE SELECTION
Night Mode Selector Switch Description
The Night Mode Switch relay closes when the system detects
either an open or closure on the MISC block NIGHT SW termi-
nals.  System programming determines whether the contact is
normally open or normally closed.  Maximum 9v DC is output
to the switch when open, and 5mA DC when shorted.
Refer to Night Servicein the Software Manual for additional
details.
Connecting a Night Mode Selector Switch 
(Figure 4-5)
1. Run...

4. Optional
Equipment4-11
OPA/VAU
OPA/VAU Description
OPA/VAU provides three voice channels to allow the system to
automatically answer calls on designated trunks, play a greet-
ing, and provide dialing options to the callers. Refer to Voice
Announce Unit in the Software Manual for a detailed descrip-
tion of OPA operation.
The three-channel OPA/VAU requires one digital extension cir-
cuit.  A second three-channel expansion PCB requires a second
digital extension circuit.
Station Cabling for the OPA/VAU...

4. Optional
Equipment
4-12
OPA/VAU
Installing an Expansion PCB(Figure 4-7)
1. Punch down one-pair station cable to a cross-connect block.
2. Run one-pair cross-connect from the cross-connect block to
the extension (B) block.
3. Terminate the station cable to the BLK/YLW leads of the
OPA/VAU modular jack.
4. Install bridging clips on the extension (B) block.
Figure 4-7 OPA/VAU EXPANSION PCB INSTALLATION
625
Modular
Jack
BLK
YELRED GRN
920 - 166C
J3
VAU Module
To Digital
Extension Circuit
To Digital...

4. Optional
Equipment4-13
2-OPX MODULE
2-OPX Description
The 2-OPX Module provides two 2500 type analog circuits for
connection to on-premise 2500 type single line devices (i.e.,
telephones, fax machines, modems, etc.) and to telco OL13B/C
OPX circuits.
Refer to Single Line Telephonesin theSoftware Manual for
more details.
Station Cabling for the 2-OPX Module
The 2-OPX Module connects to a single digital extension cir-
cuit for power/signaling. However, the 2-OPX automatically
disables the next adjacent...

4. Optional
Equipment
4-14
2-OPX MODULE
2-OPX Installation (Figure 4-8)
The 2-OPX is designed for desk/shelf mounting. A 625 modular
jack is required for the 2-OPX.
1. Ground the 2-OPX Module by connecting a 14 AWG ground
wire from the FG lug to a known earth ground.
2. Install a 625 modular jack near the 2-OPX module.3. Terminate the station cable from the cross-connect block to
GRN/RED of the 2-OPXs 625 modular jack.
4. Plug a 4-conductor line cord into the jack. Plug the other end
into the modular...

4. Optional
Equipment4-15
POWER FAILURE
Power Failure Description
The system allows 4 loop start lines per cabinet to be bridged to
designated extensions for basic telephone service during a
power failure. The power failure operation occurs during a
commercial power failure, and is not affected by PCB failure.
Refer to the chart below for PF cross-connections.
Note:An 8ATRU-LS1 equipped with an 8GSAU ground start
PCB cannot be equipped for power failure operation.  In addi-
tion, 4ATRU-EMI and 4ATRU-LD1...

4. Optional
Equipment
4-16
POWER FAILURE
Figure 4-9 4PFTU POWER FAILURE CONNECTIONS
8ATRU PCB48FU PCB
To 24FU PCB 25 Pair Cable
PF 1  T
PF 1  R
.
.
PF 2  T
PF 2  R
.
.
PF 3  T
PF 3  R
.
.
PF 4  T
PF 4  R
PF
Block
Ribbon CableRibbon Cable
92000 - 158
CN1
RUN
BLK 

4. Optional
Equipment4-17
EXTERNAL PAGING
External Page Description
Four external page zone/door box circuits are provided by each
4PGDU installed.  Each Door Chime Box/external page circuit
provides a dry relay contact. Refer to Paging, Externalin the
Software Manual for additional details.
Note:External paging can also be provided using a 3-ACI.
Refer to page 4-21 for more on the 3-ACI Module.
Installing an External Page System 
(Figures 4-10 and 4-11)
1. Set the dip switch on the 4PGDU for external...

4. Optional
Equipment
4-18
EXTERNAL PAGING
Figure 4-10  4PGDU SWITCH SETTINGS
92000 - 15
CN1
CN2
VR1
VR2
VR3
VR4
Door Box and
Paging CircuitsPage/Doorbox PCB
Fax and Alarm
Sensors
Status LED
(Normally flashing)
Door Box/External Paging Zone
1 Volume Control
Door Box/External Paging Zone
2 Volume Control
Door Box/External Paging Zone
3 Volume Control
Door Box/External Paging Zone
4 Volume ControlUse non-metallic
alignment tool To 48FU
Filter Unit
To 48FU
Filter Unit
DHDoor Box/
Page Circuit 1
Door Box/...

4. Optional
Equipment4-19
EXTERNAL PAGING
Figure 4-11  PGU BLOCK CUTDOWN
4PGDU PCB 48FU PCB 25 Pair Cable
VR1
VR2
VR3
VR4
PG/DB 1  T
PG/DB 1  R
RLY 1  T
RLY 1  R
PG/DB 2  T
PG/DB 2  R
RLY 2  T
RLY 2  R
PG/DB 3  T
PG/DB 3  R
RLY 3  T
RLY 3  R
PG/DB 4  T
PG/DB 4  R
RLY 4  T
RLY 4  R
C
Block
Ribbon Cable
92000 - 154