3.1.6.1 DIRECT CONNECTION
If you are using direct fibre connections you need to set the Scheme Setup settings and you 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.
3.1.6.2 INDIRECT CONNECTION
For 850nm communications links where the connection is not direct fibre, a number of options are available to
interface with standard telecommunications equipment. These are:
● Fibre connection to telecommunications equipment supporting the IEEE C37.94 interface
● Connection to G.703, V.35 or X.21 electrical circuits using auxiliary P59x interface units
P59x interface units are housed in 10TE wide, 4U high cases. They provide optical-electrical conversion. The optical
characteristics match those of the 850nm interface on the protection device. When used, you need one unit for
each transmitter/receiver pair. That means one unit at each end of each communications channel as
demonstrated in the figure below.
P543i/P545i Chapter 20 - Fibre Teleprotection
P54x1i-TM-EN-1 507
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