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1.6.2
1.7
1.7.1
1.8
1.8.1
1.8.2
Remote end data communication
Technical data
Table 125: DCM-SFOM - Short-range fibre optical module
Data transmission
Transmission rate
Clock source
Optical fibre
Wave length
Optical connectors
Optical budget
Transmission distance
Protocol
Optical connector
a)
depending on optical budget calculation, see example in Application manual for REC 561
Co-directional G. 703 galvanic interface
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.
Carrier module
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
model X.21 or G.703 standards.
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.
Synchronous, full duplex
64 kbit/s
Internal or derived from received signal
Graded-index multimode 50/125 μ m or 62,5/125 μ m
850 nm
ST
15 dB
a)
typically 3-5 km
FIBERDATA specific
Type ST
Chapter 9
Data communication
119
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