OSN3500 2xSTM-4 optical interface board has SSN1SLD4 and SSN1SLD4A, N1SLD4 and N1SLD4A can replace each other. It 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. 1 SLD4A board can support up to 2 MSP rings.Receives and transmits two STM-4 optical signals, and processes two STM-4 standard services or cascading services.Supports setting and querying of J0/J1/C2 bytes.
Optical interface index of SLD4A single board

Item	Indicator Value
Nominal bit rate	622080kbit/s
Line code type	NRZ
Optical interface type	I-4	S-4.1	L-4.1	L-4.2	Ve-4.2
Transmission distance (km)	0～2	2～15	15～40	40～80	80～100
Fiber Optic Interface	Single-mode LC	Singlemode LC	Singlemode LC	Singlemode LC	Singlemode LC
Operating wavelength range (nm)	1261～1360	1274～1356	1280～1335	1480～1580	1480～1580
Transmit optical power range (dBm)	-15～-8	-15～-8	-3 to 2	-3 to 2	-3 to 2
Optical reception sensitivity (dBm)	-23	-28	-28	-28	-34
Minimum Overload Point (dBm)	-8	-8	-8 -8	-8 -8	-13
Minimum extinction ratio (dB)	8.2	8.2	10	10	10.5
Maximum -20dB spectral width (nm)	-	-	1	1	1
Minimum Side-Mode Rejection Ratio (dB)	- - - - - - - - - - - - - - - - - - - - - - -	-	30	30	30

Functions and Features of the SLD4A Single Board

Functions and Features	Description
Basic Functions	Receive and transmit 2-channel STM-4 optical signals, and process two-channel STM-4 standard services or cascade services.
Optical Interface Specifications	Supports I-4, S-4.1, L-4.1, L-4.2, and Ve-4.2 optical interfaces, of which the characteristics of I-4, S-4.1, L-4.1, and L-4.2 optical interfaces are in accordance with ITU-T G.957 recommendations, and the optical interface of Ve-4.2 is Huawei's customized standard.
Optical Module Specifications	Supports optical module information detection and query. The optical interface provides laser on and off settings and laser automatic shutdown. Supports the use and monitoring of SFP pluggable optical modules, which facilitates the maintenance and upgrading of optical modules.
Business Processing	Supports VC-12/VC-3/VC-4 services and VC-4-4c cascade services.
Overhead processing	Supports segment overhead processing for STM-4 signals. Supports processing of channel overhead (transparent transmission and termination). Supports setting and querying of J0/J1/C2 bytes. Supports 1 to 2-way ECC communication.
Alarm and Performance	Provides rich alarm and performance events for easy device management and maintenance.
Protection Mode	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; one SLD4A board can support up to two MSP rings.
Maintenance Features	Supports inner loopback and outer loopback functions at the optical port level. Supports VC-4 channel inner loopback and outer loopback functions. Support soft reset and hard reset, soft reset does not affect the service. Support the query function of veneer manufacturing information. Support FPGA online loading function. Support smooth upgrade of veneer software. Support one-button data acquisition.

The technical parameters and product features of this product are provided by Shenzhen Guihang Network Technology Company Limited (www.opticaltrans.com), please retain. Huawei SDH Optical Transmission Equipment,SDH Transmission Equipment for Sale