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Remote end data communication Chapter 9
Data communication
1.5 Short range galvanic module
1.5.1 Application
The short-range galvanic module DCM-SGM can be used for communication over galvanic pi-
lot wires and can operate over distances of up to 3 km depending on pilot wire cable. Twist-
ed-pair or double-shielded cable is recommended.
1.5.2 Technical data
Table 124: DCM-SGM - Short-range galvanic module
1.6 Short range fibre optical module
1.6.1 Application
The short-range fibre optical module DCM-SFOM can only be used with multi-mode fibre.The
communication distance is normally 3 to 5 km. This module can also be used for direct connec-
tion to optical/electrical communication converters of type 21-15xx and 21-16xx from FIBER-
DATA
Physically the DCM module is inserted in slot position S19 for 1/2 19” rack.
RS 530/RS422 Contra-directional EIA D-sub 25 pins
G.703 Co-directional ITU (CCITT) Screw
Function Value
Data transmission synchronous, full duplex
Transmission type 56 or 64 kbit/s
For G703 only 64 kbit/s
Interface type According to standard Connector type
Data transmission Synchronous, full duplex
Transmission rate 64 kbit/s (256 kBaud; code transparent)
Clock source Internal or derived from received signal
Range < 3 km
Line interface Balanced symmetrical three-state current loop (4 wires)
Connector 5-pin connector with screw connection
Insulation 2,5 kV 1 min. Opto couplers and insulating DC/DC-converter
15 kV with additional insulating transformer
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