Huawei OSN3500 SSN1SL4A is a 1-channel STM-4 optical interface board, which realizes the reception and transmission of 1-channel STM-4 optical signals, completes the optical and electrical conversion of STM-4 signals, extracts and inserts overhead bytes, and reports the alarms generated on the line. Supports two-fiber multiplexing segment ring protection, four-fiber multiplexing segment ring protection, linear multiplexing segment protection, SNCP protection, SNCTP protection and SNCMP protection. Supports MSP and SNCP shared optical path protection. Provides 2 sets of Kbyte processing capacity, and 1 SL4A board can support up to 2 MSP rings. Supports inner loopback and outer loopback functions at the optical port level.

Relationship between Huawei OSN3500SSN1SL4A single-board feature codes and optical interface types

Single-board	Characteristic Code	Optical interface type
SSN1SL4A10	10	S-4.1
SSN1SL4A11	11	L-4.1
SSN1SL4A12	12	L-4.2
SSN1SL4A13	13	Ve-4.2
SSN1SL4A14	14	I-4
SSN1SL4A15	15	S-4.1
SSN1SL4A16	16	L-4.1
SSN1SL4A17	17	L-4.2
SSN1SL4A18	18	Ve-4.2
SSN1SL4A19	19	I-4
SSN1SL4A20	20	S-4.1
SSN1SL4A21	21	L-4.1
SSN1SL4A22	22	L-4.2
SSN1SL4A23	23	Ve-4.2

Huawei N1SL4A Optical Interface Board Specifications

Type	Description
I-4	2km STM-4 dual-fiber bidirectional optical interface
S-4.1	15km STM-4 Dual Fiber Bidirectional Optical Interface
L-4.1	40km STM-4 dual-fiber bidirectional optical interface
L-4.2	80km STM-4 dual-fiber bidirectional optical interface
Ve-4.2	100km STM-4 Dual Fiber Bidirectional Optical Interface
S-4.1	10km STM-4 single-fiber bidirectional optical interface
80km CWDM	80km CWDM STM-4 Optical Interface
120km DWDM	120km DWDM STM-4 optical interface

Description:

Huawei SL4A optical interface board slots are related to the following conditions: when the cross capacity is 200 Gbit/s, the SL4A board can be inserted in slots 1 to 8 and 11 to 17 of the subrack.

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