Introduction to TC-2000 system
TC-2000 Seires System is "Private Branch Exchange"(abbreviated as PBX), which is a
Telephone System that switches
calls between users on internal telephone lines while allowing other users to share a certain number of external telephone lines
Fundamental Technical Information:
We integrate in this model special-purpose telecommunication ICs from American & Japanese companies, for lower
energy consumption, small size, compact appearance, disturbance resistance, high reliability, simple installation and
programming.
The internal structure
Master control system
1.CPU is composed microprocessor, SDRAM and series-parallel conversion circuit.
2.DID/DTMF is composed circuits of auto-attendant, music generating, signal tone generating and audio decoding
circuit.
3.EXT.is composed of ringing testing circuit, contra-polar testing circuit and system multi-function testing circuit.
4.Voice volume amplifying system, which is made of patented amplifying module that enormously, improves the
communication quality.
Extension system
5.Extension pick-up & hang-up testing circuit
6.Special thunder-strike-discharging circuit & buffer circuit
7.Signal exchanging matrix circuit
Power control system
8.DC48v
9.AC65v ringing current generating circuit
Operating Principle
The structure and its operating principle are shown in the following graph.
CO Line, thunder-strike resistance, constant current load, signal exchange matrix, signal tone, ringing testing,
DTMF decoding, memory, CPU, pick-up and hang-up testing, extension, constant current source, ringing activator.
Chapter 1 Brief Introdution & Features
CPU
External line
thunder-strike resistance
thunder-strike resistance
constant current load
signal exchange matrix
signal tone
ringing testing
DTMF decoding
memory
pick-up and hang-up testing
extension
constant current source
ringing activator
Introduction to PBX system
