Ch 1 Ch2
1550 nm single-mode Not fitted
1550 nm single-mode 1550 nm single-mode
850 nm 1300 nm multi-mode
850 nm 1300 nm single-mode
850 nm 1550 nm single-mode
1300 nm multi-mode 850 nm
1300 nm single-mode 850 nm
1550 nm single-mode 850 nm
2.6.1 DIRECT CONNECTION
If you are using direct fibre connections, IEEE C37.94 protocol will be used at 12 channels of 64kbps. you need to
set the Scheme Setup settings and y
ou are advised to change the Address setting from the default. You find these
settings in the PROT COMMS/IM64 columns. You should not need to use any of the other settings that would be
applicable if using shared links and/or interfacing units.
2.6.2 INDIRECT CONNECTION
For 850nm communications links where the connection is not direct fibre, IEEE C37.94 protocol option is available
to inter
face with standard telecommunications equipment supporting the IEEE C37.94 interface.
An 850nm fibre-optic interface can connect directly to a multiplexer supporting the IEEE C37.94 standard. 850 nm
multi-mode optical fibres, either 50/125 mm or 62.5/125 m are suitable. BFOC/2.5 type fibre optic connectors are
used.
The IEEE C37.94 standard defines an N*64 kbits/s selection, where N is a number between 1 and 12 and selects
the channel used in the multiplexer. For multi-ended line differential, the communication is always 12 channels to
allow optimum protection performance.
P54A/B/C/E Chapter 15 - Fibre Teleprotection
P54xMED-TM-EN-1 321
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