1000BASE-LX/LH network transceiver module Cisco GLC-LX-SM-RGD

The Cisco 1000BASE-LX/LH network transceiver module (GLC-LX-SM-RGD) is a hot-swappable Small Form-Factor Pluggable (SFP) device that connects a Gigabit Ethernet port to fiber-optic networks. Compatible with IEEE 802.3z 1000BASE-LX, it supports single-mode fiber links up to 10 km and multimode fiber links up to 550 m. The module uses an LC PC fiber connector, operates at a wavelength of 1310 nm, and supports a data rate of 1000 Mbit/s.

Advantages

The transceiver provides a compact, industry-standard SFP form factor that is interchangeable across compatible Cisco equipment and other devices supporting the same standards. Its support for both single-mode and multimode fibers makes it flexible for varied link distances, while the specified transmit power range and LC connector ensure compatibility with common fiber installations. Its small size and light weight simplify installation and replacement in rack-mounted and modular systems.

Suitable for

• Gigabit Ethernet uplinks and switch-to-switch fiber connections
• Single-mode fiber links up to 10 km
• Multimode fiber links up to 550 m
• Replacement or upgrade of SFP slots in Cisco and compatible network equipment

Key specifications

• Model: Cisco GLC-LX-SM-RGD
• Standard: IEEE 802.3z 1000BASE-LX/LH
• Maximum data transfer rate: 1000 Mbit/s
• Maximum transfer distance: 10000 m (single-mode), up to 550 m (multimode)
• Wavelength: 1310 nm
• Connector: LC, PC
• Transmit power range: -3 to -9.5 dBmW
• Dimensions: 13.4 x 56.5 x 8.5 mm
• Weight: 0.075 kg

How to use

Power down or follow hot-swap procedures recommended by your equipment vendor, then insert the SFP module into an available Gigabit Ethernet SFP slot until it seats firmly. Connect the LC fiber cable to the module ensuring correct polarity and secure connections. Configure the connected switch or router port as required for 1000BASE-LX operation; most systems auto-negotiate the link. Monitor link status and signal levels through device management interfaces to confirm proper operation.

Recommendations

Use single-mode fiber for links approaching the 10 km range and multimode fiber for shorter runs up to 550 m. Verify fiber type, connector cleanliness, and polarity before installation. Follow Cisco or equipment-specific guidelines for hot-swapping to avoid operational interruptions.