MiCOM Alstom P591, P592 and P593 units are standalone fibre optic to electrical communications interface units.

Used alongside the P54x current differential relays and other relays with InterMiCOM64 interface, MiCOM Alstom P591, P592 and P593 units securely connect to remote pulse code modulation multiplexing equipment. The internal modem used in the interfacing device ensures fast operation of the differential protection.

Sophisticated connection and synchronisation functions
This range of MiCOM standalone units enables the P54x current differential relays and relays with InterMiCOM64 to be connected to remote pulse code modulation (PCM) multiplexing equipment.

Flexibility, secure connections and clear visualisation
The MiCOM Alstom P591, P592 and P593 range offers the flexibility to use current differential protection over integrated services digital network (ISDN), multiplexers and modem connections. Its loopback facilities can be used to simplify the differential scheme test. The range also provides clear visual indication for easy diagnostic and testing.

The interface options are:

• P591 -  Fibre optic to electrical signal G.703 (co-directional) 64 Kbit/s or 2Mbit/s
• P592 -  Fibre optic to electrical signal V.35
• P593 -  Fibre optic to electrical signal X.21