TC8000 4 to 8CH Audio/Intercom
User's Manual
Rev. 7.0
MNL-80000-01-70
- 3 -
Chapter 1 - Overview
Features
Muxes 4 to 28 Channels of Analog or Intercom Signals
Covers Voice Band Width from 300Hz to 3.4Khz
PCM Digitized Voice Technology-Extremely Low Noise
Data Card can support 8 or 16 Channels of Data such as RS-232, RS-422, RS-485,
TTL or Dry Contact Closure Detector
Single Mode or Multimode
Built-In Power Redundancy
Optional Optical Redundancy
Field Interchangeable Interface Modules
LEDs for "Alarm", "Power A", "Power B", "Vcc", Channel Indicators
Rack Mount or Standalone
Description
The TC8000 consists of AUDIO INTERFACE MODULES, a DIGITAL PROCESSING UNIT
and OPTICAL Tx & Rx. Utilizing the latest technology and components available on the market,
the audio interface modules contain CODEC chips to digitize analog audio signals and converts to
PCM (pulse code modulation). The PCM signals are digital codes sampled by DIGITAL PRO-
CESS UNIT and converted to series of logical "0" and "1". Then the series of code is transmitted
through the optic transmitter. The receiving process is the same but reversed.
Three kinds of interfaces can be specified: analog, intercom and data.
The analog interface is for FSK (frequency shift key) applications. The analog interface has 600
ohm isolation audio transformer. The analog voltage can be 0 to 3 Vpp.
The intercom interface is for 4 or 2 wire voice communication. It connects to a handset with
mouth and ear piece.
Since the analog and voice signals are digitized, the voice quality will not degrade as the distance is
extended. For example, distances to 30 km are typical for a pair of TC8000's with 1300nm single
mode fiber front end.
The TC8000 has four RJ-11 ports on the rear side to hook to either handsets or customer's audio
devices.
The TC8000 Data Card offers several different interchangeable interfaces, such as RS-232, RS-
422, RS-485, TTL and Dry Contact Relay. It can be upgraded or reconfigured to virtually any
configuration; simply contact the factory should the need arise.
Built-in power redundancy is standard. Optical redundancy is available as an option. Fiber
Optical connectors are ST (FC is optional); electrical connectors are RJ11. Power is 12VDC
(24VDC or -48VDC, are optional).
The TC8000 is based on modern FPGA (field programmable gate array) technology. As a result,
it benefits users by enabling optimum flexibility, low current consumption, high reliability and
maximum MTBFs.
