The Huawei OSN 3500 is an optical transport product used for STM-64/16/4/1 networks. It has a hybrid MSTP platform with a 200G TDM and 160G packet universal switch capacity across 16 service slots. The OSN 3500 supports flexible networking topologies including mesh, ring, and intersecting ring configurations. It provides carrier-class protection schemes like mesh restoration and distributed rerouting protection across five service levels.

1. Huawei OSN 3500 description
Huawei optix OSN 3500 is the most popular optical transport product. It used in STM-64 / STM-16 / STM-4 / STM-1 level
Hybrid MSTP Platform. 200G TDM / 160G Packet universal switch capacity, with 16 service slots.
Huawei OSN 3500 possesses flexible networking capacity
Generally speaking, it supports: (1) Mesh networking with plug-and-play network nodes
(2)dynamic increase of rate and capacity
(3)various networking topologies, including chain, ring, tangent rings, intersecting rings, etc
(4)maximum 2 STM-64 four-fiber MSP rings, 4 STM-64 two-fiber MSP rings, 11 STM-16 four-fiber MSP rings, 12 STM-16
two-fiber MSP rings
As for the 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
Slot Allocation
An OptiX OSN 3500 subrack consists of an upper layer and a lower layer. The upper layer, where 19 slots are available, is the
slot area for interface boards. The lower layer, where 18 slots are available, is the slot area for processing boards.
single-slot layout of an OptiX OSN 3500 subrack

2. Allocation
Slots for service interface boards: slots 19-26 and 29-36
Slots for service processing boards: slots 1-8 and 11-17
Slots for cross-connect and timing boards: slots 9-10
Slots for system control and communication boards: slots 17-18 (slot 17 can also house a processing board)
Slots for power interface boards: slots 27-28
Slot for an auxiliary interface board: slot 37
Slots for fan boards: slots 38-40

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