Cambium Networks SFP-10G-SR SFP transceiver module

The Cambium Networks SFP-10G-SR is an SFP+ fiber optic transceiver module designed for short-range 10 Gigabit Ethernet links. It converts 10Gbit/s serial PECL/CML electrical data to 850 nm serial optical data compliant with the 10GBASE-SR standard on transmission, and converts received 10Gbit/s serial optical data back to serial PECL/CML electrical data on reception. The module follows SFI electrical specifications with 100 Ω differential transmitter input and receiver output impedance, internal AC coupling on data lines, and built-in differential termination to reduce common-mode conversion and EMI. It is intended for use over improved FR4 up to about 200 mm or standard FR4 up to about 150 mm with a single connector.

Advantages

The module provides automatic power control (APC) to stabilize optical output across voltage and temperature variations, and includes standard control and alarm pins such as Transmit Disable (TX_Dis), Transmit Fault (TX_Fault) and Loss of Signal (Rx_LOS). Open-collector/open-drain compatible contacts allow easy integration with host pull-up resistors and common host interfaces. Power supply filtering is recommended for both transmitter and receiver to ensure signal integrity and reliable operation.

Suitable for

• Short-range 10 Gigabit Ethernet links (10GBASE-SR)
• Data center and enterprise fiber connections up to specified FR4 distances
• Integration into Cambium Networks SFP+ compatible equipment

Key specifications

• Brand: Cambium Networks
• Model / MPN: SFP-10G-SR
• Form factor: SFP+
• Maximum data rate: 10000 Mbit/s (10 Gbit/s)
• Wavelength: 850 nm
• Compatibility: 10GBASE-SR compliant
• Electrical interface: SFI-compliant, 100 Ω differential impedance
• Typical FR4 reach: up to ~200 mm (improved FR4) or ~150 mm (standard FR4) with one connector

How to use

Insert the SFP+ transceiver into a compatible SFP+ port on the host device following the host manufacturer's insertion/removal procedure. Ensure TX_Disable, TX_Fault and Rx_LOS pins are connected according to the host design: TX_Fault and Rx_LOS are open-drain/open-collector outputs and must be pulled up to Vcc_Host with 4.7–10 kΩ resistors (or actively terminated), while TX_Disable is an input that should be pulled up to VccT with a 4.7–10 kΩ resistor; driving TX_Disable high or leaving it open disables the transmitter, driving it low enables normal operation. Provide recommended power supply filtering for both transmitter and receiver circuits.

Recommendations

Use the module within the specified FR4 trace lengths and ensure proper host-side pull-up resistors or terminations for TX_Fault and Rx_LOS. Observe TX_Disable logic when enabling or disabling the laser. Apply adequate power supply filtering to minimize noise and ensure compliance with signal integrity and EMC requirements.