2-7
2.3 Network Control Unit (NCU) PCB
The NCU PCB provides the connection to the telephone line. It consists of the interface circuit, dial
pulse generator, ring signal detector and telephone control circuit.
TXA
TONE
OH
CI
RXA
GENERATOR
NCU PCB
MODULAR
PCB
+24V, +5V, GND
+12V, -12V
S
DP
NCU PCB block diagram
Major components of the NCU
CML relay
Connects the telephone line to the phone or fax.
S relay
Used to send dial pulse signals in pulse dialing.
OH & Tone detector
Detects the On-hook condition of the second telephone unit.
H relay
Connects the Tel1 and Tel2 line to the fax machine.
24V generator
Supplies 24 volts to the relays.
Ring signal detector
A photo coupler that detects an incoming ring.
Summary of Contents for OKIOFFICE 1200
Page 1: ...OKIOFFICE 1200 1600 FIELD ENGINEERING MANUAL Version 2 0 11 June 2002...
Page 7: ...iv Packaging contents 6 22 Installation 6 22 Setting of the Paper Size 6 25...
Page 12: ...2 2 OKIOFFICE 1200 Interconnect Block Diagram 2 2 OKIOFFICE 1200 Connection Diagram 2 2...
Page 13: ...2 3 OKIOFFICE 1600 Interconnect Block Diagram 1 2 OKIOFFICE 1600 Connection Diagram 1 2...
Page 14: ...2 4 OKIOFFICE 1600 Interconnect Block Diagram 2 2 OKIOFFICE 1600 Connection Diagram 2 2...