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E.3 IEC 60870-5-103
A copper-wire based transmission system is used in MIFII between the protection equipment and the control system.
The data circuit terminating equipment (DCE) of the protection equipment may be realized as a copper-wire based
transmission system. In the following sub-clauses is described.
E.3.1.1 ELECTRICAL INTERFACE - EIA RS-485 INTERFACE
As an alternative to the fibre optic transmission a copper-wire based transmission system is used between MIFII and the
control system. This transmission system shall comply with the EIA RS-485 standard.
Due to the characteristic of the EIA RS-485 standard a maximum number of 32 units of load can be connected to one
physical line. The location and the values of the termination resistances used are not specified, neither in the base
standard nor in this companion standard. For compatibility purposes, the manufacturer shall state the units of load for
each specific device.
The type of the cable used is not defined in the EIA RS-485 standard.
E.3.1.2 OPTICAL INTERFACE - FIBRE OPTIC TRANSMISSION
If a fibre optic transmission system has been used, the compatible interface is a fibre optic connector at the protection
equipment. Separate optical fibres are used in the monitor direction and in the control direction. The DCE may be
E
mechanically and/or electrically integrated into the data terminal equipment (DTE).
E.3.1.3 TRANSMISION CONTROL SPECIFICATIONS
The standard transmission speed are 9.6 kbits/s or 19.2 kbits/s (adjustable).
E-4
X
EIA RS-485
32
Number of loads for one protection equipment
Glass fibre
Plastic fibre
F-SMA type connector
BFOC/2,5 type connector
X
X
MIFII Digital Feeder Relay
9600 bit/s
19200 bit/s
APPENDIX E
E.3.1 PHYSICAL LAYER
GEK-106237P
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