48
Configuring the fibre optical modem
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Two different levels of optical output power can be set on the HMI under:
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For the optical module, the optical output power has to be set according to the attenua-
tion of the fibre optic link.
For multimode fibres:
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If the attenuation is less than 6 dB, use Low setting
•
If the attenuation is higher than 10 dB, use High setting
•
If the attenuation is between 6 and 10 dB, use either High or Low setting
For single-mode fibres:
•
If the attenuation is higher than 5 dB, use High setting
•
If the attenuation is between 0 and 5 dB, use either High or Low setting
To achieve the best operation, the optical communication modules at both terminals
must be synchronised. To fulfil this, one terminal acts as a Master and the other as a
Slave. This is set under:
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This setting should not be mixed up with the Master-Slave setting for the differential
function.
When communicating with FOX20 or FOX6Plus, the setting should be Slave.
When operating over dedicated fibres the setting shall be Master at one terminal and
Slave at the other.
Summary of Contents for REL 551 2.3 Series
Page 16: ...10 Note signs KDSWHU 6DIHW LQIRUPDWLRQ ...
Page 44: ...38 Checking the binary I O circuits KDSWHU KHFNLQJ WKH H WHUQDO FLUFXLWU ...
Page 52: ...46 Checking the self supervision signals KDSWHU QHUJLVLQJ WKH WHUPLQDO ...
Page 140: ...134 Testing the interaction of the distance protection KDSWHU 7HVWLQJ WKH SURWHFWLRQ V VWHP ...
