The functions of each subrack area are as follows: Slot area for the auxiliary interface board: This area is used to house the auxiliary interface board, which provides alarm interfaces, orderwire phone interface, management and maintenance interface, and clock interface. Slot area for interface boards: This area is used to house the tributary interface boards and Ethernet interface boards. Slot area for processing boards: This area is used to house the line, tributary and Ethernet processing boards, system auxiliary processing boards and the integrated boards of the cross-connect, timing and SCC units. Fan area: This area is used to house two fan modules, which dissipate the heat generated by the equipment. Power supply area: This area is used to house two PIU boards, which are used to supply power to the equipment. Slot Allocation The OptiX OSN 2500 subrack has only one layer. The left portion and right portion of the subrack, where eight slots are present, are slot areas for interface boards. The middle portion of the subrack, where ten slots are present, is the slot area for processing boards. Slot layout of the OptiX OSN 2500 subrack (before the division of slots) Slot layout of the OptiX OSN 2500 subrack (after the division of slots) lot Area for Interface Boards Slots for interface boards: slots 1-4 and 15-18 Slot Area for Processing Boards Slots for processing boards before the division of slots: slots 5-8 and 11-13 Slots for processing boards after the division of slots: slots 5-8, 11-13, and 19-21 Slots for integrated boards of the SCC, cross-connect and line units: slots 9-10 Slot for the system auxiliary processing board: slot 14 Other Slots SEI auxiliary interface board: slot area for auxiliary interface boards Slots for PIU boards: slots 22-33 Slots for fan boards: slots 24-25 Product application Highlight Features Large switching capacity 60G high order, 20G low order High integration Subrack dimensions 472mm (H) x 447mm (W) x 295mm (D), 9 slots for processing boards before division of slots, 12 slots for processing boards and 8 slots for interface boards after division of slots Flexible networking capacity Supports Mesh networking with plug-and-play network nodes Supports dynamic increase of rate and capacity Supports various networking topologies, including chain, ring, tangent rings, intersecting rings, etc Supporting maximum 2 STM-16 four-fiber MSP rings, 4 STM-16 two-fiber MSP rings, 8 STM-4 four-fiber MSP rings, 12 STM-4 two-fiber MSP rings Carrier-class protection Mesh Protection and restoration(ASON) Distributed restorable rerouting protection 5-level service dedicated protection scheme based on different SLA: Diamond, Gold, Silver, Copper and Iron services SDH Network Protection 2/4 fiber MSP Ring, 1+1, 1: n Linear MSP, SNCP/SNCMP/SNCTP, Fiber shared virtual path protection, Fiber shared MSP Ring, DNI (ITU-T G.842) Service Protection Ethernet: RPR, RSTP ATM: VP-RING/VC-RING Highly Reliable Design 1+1 hot backup for system control boards, cross-connect and synchronous timing boards 1+1 hot backup for power supply modules Redundancy protection for fan modules TPS protection 1:n tributary protection for E1/T1/E3/T3/ E4/STM-1(e)/FE Enterprise-focused Features Intelligent ASON based Mesh network can against multi-node failures, improving network reliability by 10 times Single-span transmission for a distance of 270km without a Raman amplifier, fewer REGs to reduce the network construction cost and facilitate the maintenance Single-fiber bidirectional optical module to solve the problem of a lack of fiber resources, and built-in WDM to meet the large bandwidth requirements
