| Fiber optic voice data link is specifically designed for use in harsh environments and battlefield applications. The system consists of two units and a two core fiber optic cable rated for battlefield applications. Both the units are identical. This equipment was designed for use in Prithvi missile system. It can be used in suitable application. The cable winch can also be designed to the requirement. |
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| Specifications |
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General:
- High speed 8bit Micro-controller based
- Voice companding
- High-speed serial controllers at the input
- Fail proof circuitry for high voltage inputs
Communication channels:
- 4 Nos. RS422 compatible serial channels at 9.6k or 19.2k baud switch selectable (full duplex)
- 16 digital signals (bi-directional)
- 8 with 28VDC/Open level converters (one used as interlock)
- 8 with differential TTL inputs
Output characteristics
(Electrical I/F)
Voice:
- 2 wire Output
- 600W output impedance (transformer coupled)
Serial outputs:
- Standard RS422 transmitters. (26C31)
- Maximum load current 20mA
- Short circuit protected
Digital outputs:
- Differential Outputs:
- 26C31 line driver output(Max. load current 20mA)
- 28V outputs:
- NO contacts with 28V to one end
- Separate switch to control 28V feed
Multiplexing
- Method Time Division Multiplexing
- Frame size 48 bits including sync
- Frame rate 8000 frames/sec
- Sampling rate
Voice : 8kHz
Serial channels : 2000 bytes/sec/channel
Digital inputs : 360 bytes/sec
Power Supply
- 28 ± 4V DC. The internal circuits are isolated from this power supply
Fiber optic Interface
- 850nm transmitter and receiver pair for each fiber link
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Input Characteristics (Electrical I/F)
Voice:
- 600W (transformer coupled) 2 Wire input
Serial inputs:
- Optically isolated
- Load resistance equivalent to 220 ohms in series with a LED
Digital inputs:
- Optically isolated
- Load resistance equivalent to 220 ohms in series with a LED for differential inputs
- Load resistance equivalent to 2.7K in series with a LED for 28V inputs
- 2 core multimode battlefield rated cable on winch
- Transmitter/Receiver with the fiber optic end connections are mounted in a separate enclosure
- Interconnection between the multiplexer and the transmitter/receiver is electrical
Environmental
- Temperature
- Operating : -20 to +55°C
- Storage : -30 to +65°C
- Humidity
- 95% non-condensing
- Damp Heat:
- 45°C at max. humidity
- EMI/EMC:
- Meets RS-03, CS-02, CS-06, ESD per
MIL-STD-461C
- Vibration:
Sine
- 5 -500 Hz, 1 oct/min
- 30 min/axis, 3 axes, 1.5g/6mm
Enclosure:
- Aluminium casting
- Qualified for Salt spray and
contamination tests
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