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SPT-P856G-S3, 850nm 6.25Gbps SFP+ SR Transceiver for CPRI and OBSAI

1550nm 1G fiber optic transceiver


850nm 6.25Gbps SFP+ Transceiver 300m for CPRI and OBSAI


Support Multi Rate up to 6.25 Gbps
CPRI/OBSAI Compatible Optical Interface
Hot Pluggable SFP+ footprint
850nm VCSEL transmitter, PIN photo-detector
Transmission distance up to 300m with MMF
Digital Status monitoring Inter face
Duplex LC connector
RoHS compliant and lead Free
Metal enclosure for lower EMI
Single 3.3V power supply
Power dissipation<800mW
Compliant with FC-PI-4 800-MX-SN,SFF-8431,SFF-8432 and SFF-847
Operating case temperature:
Standard: 0 to +70°C
Industrial: -40 to +85°C


Radio Base Station
CPRI or OBSAI rates:
LTE optical repeater application

Product description

This 850 nm VCSEL SFP+ transceiver is designed to transmit and receive optical data over 50/125 μm or 62.5/125 μm multimode optical fiber .
SPT-P856G-S3 is a high performance, cost effective modules for serial optical data communications such as CPRI and OBSAI, which is supporting Multi Rate Up to 6.25Gbps, and transmission distance up to 300m on MM fiber.

The SFP+ SR module electrical interface is compliant to SFI electrical specifications. The transmitter input and receiver output impedance is 100 Ohms differential. Data lines are internally AC coupled. The module provides differential termination and reduce differential to common mode conversion for quality signal termination and low EMI. SFI typically operates over 200 mm of improved FR4 material or up to about 150mmof standard FR4 with one connector.

The transmitter converts 10Gbit/s serial PECL or CML electrical data into serial optical data compliant with the 10GBASE-SR standard. An open collector compatible Transmit Disable (Tx_Dis) is provided. A logic “1,” or no connection on this pin will disable the laser from transmitting. A logic “0” on this pin provides normal operation. The transmitter has an internal automatic power control loop (APC) to ensure constant optical power output across supply voltage and temperature variations. An open collector compatible Transmit Fault (TFault) is provided. TX_Fault is a module output contacts that when high, indicates that the module transmitter has detected a fault condition related to laser operation or safety.


The TX_Fault output contact is an open drain/collector and shall be pulled up to the Vcc_Host in the host with a resistor in the range 4.7-10 kΩ. TX_Disable is a module input contact. When TX_Disable is asserted high or left open, the SFP+ module transmitter output shall be turned off. This contact shall be pulled up to VccT with a 4.7 kΩ to 10 kΩ resistor

The receiver converts 10Gbit/s serial optical data into serial PECL/CML electrical data. An open collector compatible Loss of Signal is provided. Rx_LOS when high indicates an optical signal level below that specified in the relevant standard. The Rx_LOS contact is an open drain/collector output and shall be pulled up to Vcc_Host in the host with a resistor in the range 4.7-10 kΩ, or with an active termination. Power supply filtering is recommended for both the transmitter and receiver. The Rx_LOS signal is intended as a preliminary indication to the system in which the SFP+ is installed that the received signal strength is below the specified range. Such an indication typically points to non-installed cables, broken cables, or a disabled, failing or a powered off transmitter at the far end of the cable.





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