SFP Transceiver OEM J8177C X121 1G RJ45 Ethernet module

SFP Transceiver OEM J8177C X121 is a compact 1.25 Gbps SFP module that provides 1000BASE-T Ethernet over UTP Cat5 copper cabling via an RJ-45 connector. Designed for standard SFP slots, it operates from 0 to 70°C, uses a 3.3 V supply and is compatible with HP equipment, offering a 100 m reach on suitable copper cabling.

Advantages

The module delivers gigabit copper connectivity in a small, hot-pluggable SFP form factor, enabling space-saving uplinks and easy replacement without powering down equipment. Compatibility with HP devices and standard RJ-45 interfaces simplifies integration into existing network hardware. Low-voltage 3.3 V operation and support for UTP Cat5 cable up to 100 m make it suitable for typical LAN installations.

Suitable for

• Switch uplinks where SFP copper ports are required
• Routers and media converters needing 1 G RJ-45 interfaces
• Data center and enterprise networks with Cat5/Cat5e copper runs up to 100 m

Key specifications

• Form factor: SFP (1.25 Gbps)
• Standard: 1000BASE-T
• Connector: RJ-45
• Cable type: UTP Cat5 (up to 100 m)
• Operating temperature: 0 to 70 °C
• Supply voltage: 3.3 V
• Manufacturer part / model: J8177C_OEM (X121)

How to use

Insert the SFP Transceiver OEM J8177C X121 into an empty SFP slot on a compatible switch, router or media converter until it clicks into place. Connect an RJ-45 terminated UTP Cat5/Cat5e cable to the module and the remote device. Ensure the host device supports SFP copper modules and is configured for a 1 G link. Monitor link LEDs or management interfaces to confirm link establishment.

Usage recommendations

Use high-quality UTP Cat5 or better cabling and keep copper runs within 100 m. Verify device firmware and compatibility lists for HP interoperability. Handle the module by its housing and avoid touching electrical contacts to prevent damage.