The SR-2000 is a universal subrack chassis that accepts all ?ber optic transmission card units. Made of precision extruded Aluminum components, it is available with one or two redundant 100W (87/287VAC) switching power supplies. Cards and sup- plies utilize a rear loading slide in procedure. The SR-2000 Master accommodates up to 18 card units and features, a unique Microsoft Windows based Network Management system. Link status monitoring is via RS-232 connection to the PC. The SR-2000/E is Expansion Subrack with a local and global (optional) network connection via PS-485. For convenience of installation, electrical and optical interconnections are rear panel mounted.