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Remote end data communication Chapter 9
Data communication
1.6.2 Technical data
Table 125: DCM-SFOM - Short-range fibre optical module
1.7 Co-directional G. 703 galvanic interface
1.7.1 Application
The galvanic data communication module DCM-G.703 according to G.703 is not recommended
for distances above 10 m. Special attention must be paid to avoid problems due to noise inter-
ference. This module is designed only for 64 kbit/s operation.
1.8 Carrier module
1.8.1 Application
Use the carrier module with the appropriate galvanic or optical communication submodule for
short range communication of binary signals. Use the optical communication module
(DCM-SFOM) when connecting a FIBERDATA 21-15X or FIBERDATA 21-16X opti-
cal-to-electric modem. The 21-15X model supports V.35 and V.36 standards, and the 21-16X
mo
del X.21 or G.703 standards.
1.8.2 Design
The carrier module is used to connect a communication sub-module to the platform. It adds the
CAN-communication and the interface to the rest of the platform. By this the capability to trans-
fer binary signals between for example two distance protection units is added.
The following three types of sub-modules can be added to the carrier module:
• Short range galvanic communication module (DCM-SGM)
• Short range optical communication module (DCM-SFOM)
• G.703 communication module (DCM-G.703)
The carrier module senses the type of sub-module via one of the two connectors.
Data transmission Synchronous, full duplex
Transmission rate 64 kbit/s
Clock source Internal or derived from received signal
Optical fibre Graded-index multimode 50/125μm or 62,5/125μm
Wave length 850 nm
Optical connectors ST
Optical budget 15 dB
Transmission distance typically 3-5 km
a)
Protocol FIBERDATA specific
Optical connector Type ST
a)
depending on optical budget calculation, see example in Application manual for REC 561
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