Fiber optic modem G.703 64kbps
Article Number: 21-180
- Fiber Optic G.703 64kbps Codirectional Converter
Function
The 21-180 is a synchronous 64kbps modem for codirectional clock environments that can be used to extend the reach of balanced G.703 interafces up to 2km allowing for a cost effective transmission without electromagnetic interference and signal degradation.
The modem can use the incomming clock from the G.703 interface and propagate it down the fiber or use its internal clock source running at PDH accuracy. The modems automatic clock phase adjustment accomondates for any fiber round trip delay.
Fiber optic G.703 64kbps Codirectional
The ITU-standard "G.703 64kbit/s codirectional interface" describes a galvanic interface.
This interface is commonly used by teleprotection equipment for connection to telecom multiplexers.
The 21-170 converts the codirectional interface signals to a proprietary fiber optic protocol used for example by teleprotection equipment from ABB.
G.703/704 E1 Unbalanced
The ITU-standard G.703 describes the physical and electrical characteristics of hierarchical digital interfaces at rates up to 140 Mbps.
G.704 describes frame structures on G.703 interfaces up to 45 Mbps.
E1 describes a galvanic G.703 interface with G.704 frames at 2048 kbps commonly used in telecommunication.
Applications
The 21-180, Fiber Optic G.703 64kbps Codir Converter is intended to extend distance and to provide galvanic isolation for disturbance free insertion of 64kbps data into SDH/PDH - multiplers.
The converter is compatible with the FOT module in ABB's teleprotection terminals 550/560 for connecting the terminals to higher order networks.
Technical Data
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Data Speed
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64 kbps (1,536Mbps linespeed)
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Protocol
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Fibersystem proprietary 64kbps
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Fiber
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Multi mode 50/125µm or 62,5/125µm, ST-connector
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Optical System Budget
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13dB in 62,5/125µm. 9dB in 50/125µm fiber
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Typical distance
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0-2km (3dB system margin for 50/125µm and 6dB for 62,5/125µm)
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Galvanic Data speed
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64Kbps
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Galvanic Protocol
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G.703
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Connector
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RJ45 , Twisted pair cable
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DC
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48V DC to 250V DC, ±20%
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AC
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230V AC , ±20%, 50 60 Hz
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AC-connector
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IEC 320, 3-pin
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Operating Temperature Range
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-25 to +55°
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Storage Temerature Range
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-40 to +85°
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Relative Humidity Operating
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5 to 95%
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Relative Humidity Storage
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5 to 95% non condensing
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Immunity
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EN 61000-6-2
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Emission
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EN 61000-6-4
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LVD
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EN 50187; RIV=250 V OVC=III
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Vibration
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IEC 60255-21-1 Class 2
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Shock
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IEC 60255-21-2 Class 2
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Seismic
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IEC 60255-21-3 Class 2
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ESD
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IEC 60255-22-2 Class 3, contact 6kV, air 8kV
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Radiated
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IEC 60255-22-3 / IEEE/ANSI C37.94.2; 35V/m
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Burst Power
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IEC 60255-22-1 Class III
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Burst Communication
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IEC 60255-22-1 Class II; 0,5kV diff; 1kV common mode
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Fast Transient Power
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IEC 60255-22-4 Class IV
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Fast Transient Communication
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IEC 60255-22-4 Class II; 1kV
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Dielectric Test
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IEC 60255-5, 2,0kV 1min
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Impuls Voltage Test
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IEC 60255 / EN50178 5kV / 6 kV
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Insulation Resistance
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IEC 60255-5; > 100Mohm at 500VDC
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Physical size
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Height 45mm, Width 483mm, Without brackets 380mm), Depth 173mm
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Weight
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3 kg
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Features
- Fiber optic transmission immune to EMI and RFI.
- Standards compliant for power substation installations
- 19" mounting with only 200mm depth
- Single power supply range from 48VDC to 230VAC
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