Ch 1 Ch21300 nm multi-mode Not fitted1300 nm multi-mode 1300 nm multi-mode1300 nm single-mode Not fitted1300 nm single-mode 1300 nm single-mode1550 nm single-mode Not fitted1550 nm single-mode 1550 nm single-mode850 nm 1300 nm multi-mode850 nm 1300 nm single-mode850 nm 1550 nm single-mode1300 nm multi-mode 850 nm1300 nm single-mode 850 nm1550 nm single-mode 850 nm3.1.6.1 DIRECT CONNECTIONIf you are using direct fibre connections you need to set the Scheme Setup settings and you are advised to changethe Address setting from the default. You find these settings in the PROT COMMS/IM64 columns. You should notneed to use any of the other settings that would be applicable if using shared links and/or interfacing units.3.1.6.2 INDIRECT CONNECTIONFor 850nm communications links where the connection is not direct fibre, a number of options are available tointerface 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 unitsP59x interface unit options are:● P591 - Fiber optic to electrical signal G.703 (co-directional) 64 Kbit/s or 2Mbit/s, depending on orderingoption● P592 - Fiber optic to electrical signal V.35● P593 - Fiber optic to electrical signal X.21P59x interface units are housed in 10TE wide, 4U high cases. They provide optical-electrical conversion. The opticalcharacteristics match those of the 850nm interface on the protection device. When used, you need one unit foreach transmitter/receiver pair. That means one unit at each end of each communications channel asdemonstrated in the figure below.Chapter 19 - Fibre Teleprotection P446SV482 P446SV-TM-EN-1
