StarTech.com Cisco GLC-LH-SMD Compatible SFP Transceiver Module - 1000BASE-LH - 1GbE Single Mode Fiber SMF Optic Transceiver - 1GE Gigabit Ethernet SFP - LC 20

Product Overview

The StarTech.com Cisco GLC-LH-SMD Compatible SFP Transceiver Module is a high‑performance, single‑mode optical transceiver designed for 1 GbE Ethernet applications. It matches the specifications of the original Cisco GLC‑LH‑SMD module, ensuring seamless integration with Cisco switches and routers that support 1000BASE‑LH. The module delivers reliable data transmission over long distances using a 1310 nm wavelength, making it ideal for fiber optic networks requiring up to 20 km of reach.

Key Technical Specifications

• Interface: SFP (Small Form‑Factor Pluggable)
• Speed: 1 Gbps (Gigabit Ethernet)
• Wavelength: 1310 nm (Single‑mode)
• Reach: Up to 20 km on single‑mode fiber
• Connector Type: LC
• Compatibility: Fully compatible with Cisco GLC‑LH‑SMD, including Cisco Firepower, IE2000, and IE4000 series devices
• Data Rate: 1000 Mbps
• Optical Power Output: Typical –1.5 dBm (±0.3 dB)
• Optical Power Input: Minimum –10 dBm, Maximum +2 dBm
• Operating Temperature: 0 °C to 70 °C
• Power Consumption: < 1.5 W
• Dimensions: 15 mm (length) × 9 mm (width)
• Weight: Approximately 10 g
• DDM (Digital Diagnostic Monitoring): Yes – provides real‑time monitoring of temperature, voltage, and optical power levels

Design Features

The module incorporates a compact Mini‑GBIC form factor, allowing it to fit into standard SFP slots on network equipment. Its LC connector is engineered for low insertion loss and high return loss, ensuring minimal signal degradation over long distances. The integrated DDM functionality enables administrators to monitor key performance indicators directly from the device’s management interface, facilitating proactive maintenance and troubleshooting.

Installation and Compatibility

Installing the StarTech SFP transceiver is straightforward:

1. Power down the host device (switch or router).
2. Insert the module into an available SFP slot, ensuring a firm click.
3. Reconnect power and verify that the device recognizes the new transceiver.

This module is fully compatible with any Cisco hardware that accepts the GLC‑LH‑SMD specification. It also works seamlessly with other vendors’ equipment that support 1000BASE‑LH over single‑mode fiber, such as certain Juniper and HP switches.

Performance Characteristics

The 1310 nm wavelength is chosen for its low attenuation in single‑mode fiber, allowing data to travel up to 20 km without the need for repeaters. The module’s optical output power of –1.5 dBm provides a robust signal margin, while the input range ensures compatibility with a wide variety of transceivers and host devices.

Use Cases

• Enterprise Campus Networks: Connecting core switches to distribution layers over long fiber runs.
• Data Center Interconnects: Linking remote data centers or server rooms via single‑mode links.
• Telecommunications Backbone: Extending fiber reach between telecom nodes.
• Industrial Automation: Providing reliable Ethernet connectivity in harsh environments where long‑haul fiber is required.

Maintenance and Diagnostics

The DDM feature allows real‑time monitoring of:

• Module temperature (°C)
• Supply voltage (V)
• Transmit optical power (dBm)
• Receive optical power (dBm)

These metrics can be accessed via SNMP or the device’s web interface, enabling early detection of potential issues such as fiber degradation or connector contamination.

Environmental and Safety Considerations

The module operates within a wide temperature range (0 °C to 70 °C) and is designed to meet industry safety standards for electrical and optical components. Its low power consumption (<1.5 W) contributes to overall energy efficiency in network deployments.

Conclusion

The StarTech.com Cisco GLC-LH-SMD Compatible SFP Transceiver Module delivers reliable, high‑speed connectivity over long distances with the convenience of a compact SFP form factor. Its full compatibility with Cisco devices, robust optical performance at 1310 nm, and integrated DDM diagnostics make it an excellent choice for any network requiring dependable single‑mode fiber links up to 20 km.