Network transceiver module Cambium Networks SFP-1G-SX, SFP fiber optic 1000 Mbit/s 850 nm, 3.3 V

Cambium Networks SFP-1G-SX is a small form-factor pluggable (SFP) fiber optic transceiver module that supports up to 1000 Mbit/s (1.25 Gbit/s line rate) over multimode fiber using an 850 nm wavelength and a 3.3 V supply. The module is intended for installation in standard SFP ports on switches, routers and other networking equipment to provide short-range uplink and server connectivity with a transmission reach up to 550 meters over multimode fiber.

Advantages

The transceiver offers a compact SFP form factor compliant with SFP MSA and SFF-8472 specifications, enabling hot-pluggable installation and broad compatibility with networking equipment. It integrates a VCSEL laser transmitter, a PIN photodiode with trans-impedance amplifier and a monitoring/control MCU, delivering reliable optical transmission within Class I laser safety limits. The module is cost-effective for short-range multimode links while supporting standard data rates for gigabit Ethernet and similar applications.

Suitable for

• Short-range multimode fiber uplinks between switches and aggregation devices
• Server to switch connections in data centers or server rooms
• Access layer links in campus and enterprise networks
• Replacement or upgrade of existing SFP ports to add fiber connectivity

Key specifications

• Interface type: SFP (small form-factor pluggable)
• Operational wavelength: 850 nm
• Maximum data transfer rate: 1000 Mbit/s (1.25 Gbit/s line rate)
• Supply voltage: 3.3 V
• Maximum multimode fiber reach: up to 550 m (depending on fiber type and link conditions)
• Transmitter type: VCSEL laser
• Receiver: PIN photodiode with trans-impedance amplifier (TIA)
• Compliance: SFP MSA and SFF-8472 compatible; Class I laser safety

How to use

Install the SFP-1G-SX transceiver into an empty SFP port on a compatible switch, router or media converter while the device is powered on or off according to the host equipment manual. Connect multimode fiber patch cords to the LC duplex connector on the module, ensuring correct polarity and secure connection. Verify link status in the host device management interface and confirm that the port negotiates the expected gigabit link speed. Monitor optical and diagnostic parameters through the host device if supported by the SFF-8472 interface.

Recommendations

Use quality OM3/OM4 multimode fiber and correctly terminated LC patch cords to achieve the specified reach; avoid bending the fiber beyond recommended radii and maintain clean end faces. Check compatibility with the host device vendor and firmware; follow ESD precautions during handling and adhere to standard laser safety practices.