Fiber optic modem G.703/X.21
Article Number: 21-16xx, 21-1651, 21-1601
- Fiber Optic Modem G.703/X.21
- This product is obsolete.
- For G.703 codirectional 64kbps please consider 21-180
- For other interfaces and conversions - Please contact us!
Function
The modem 21-1601 and 21-1651 from Fibersystem are combined fiberoptic synchronous and asynchronous modem with four different interfaces.
The interfaces are:
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G.703 unbalanced 2Mbps,
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G.703 balanced Nx64Kbps,
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X.21
RS-530, not mounted on products produced after October 2006.
The modems are available in 2 versions.
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21-1601 runs on 110-230 VAC , +/- 20%, power supply.
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21-1651 runs on 48-250 VDC, +/- 20%, power supply.
The modem can be mounted in 19 rack with the mounting brackets included with the product.
In synchronous mode the data rate are settable from 4.8kbps to 2048kbps.
To run the modem in asynchronous mode the data rate must be set to at least 8 times the actual data rate giving a maximum asynchronous rate of 256kbps.
The modem can be configured to use three models of clock generation:
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Internal clock, where the modem generates the transmit clock.
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External clock, where the modem recovers the clock from the selected interface.
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Loop clock, where the modem recovers the clock from the fiber link.
The 21-1601 or 21-1651 can be connected to a telecom network or “back-to-back”.
The front panel is marked 21-16xx and the product is often referred to as “21-16xx”.
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 21-16xx, Fiber Optic XXXXX Converter is intended to extend distance and to provide galvanic isolation for disturbance free
insertion of 64kbps data into SDH/PDH 2Mbps G.703 connections by the use of the G.704 framing structure,
The converter is compatible with the FOT module in ABB's teleprotection terminals 550/560 for connecting the terminals to higher order networks.
The 21-1xxx converter running of its internal clock can also be used to directly interconnect protection equipment over leased lines using electrical E1 modems as SHDSL and alike.
Technical Data
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Data Speed
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xxx kbps
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Protocol
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Fibersystem proprietary xxxxkbps
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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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xxbps
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Galvanic Protocol
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G.703, E1, codir, contra, RSxxx
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Connector
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XXXX, 2 x BNC , Coaxial 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 EI 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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