Product Overview
The Cisco GLC-LH-SMD is a 1000BASE-LX/LH SFP transceiver module designed for long-distance Gigabit Ethernet connections over single-mode fiber (SMF). Operating at a 1310 nm wavelength, it supports transmission distances up to 10 kilometers on SMF and also offers limited compatibility with multimode fiber (MMF) using a mode-conditioning patch cable. Equipped with Digital Optical Monitoring (DOM), the GLC-LH-SMD is ideal for enterprise backbones, data centers, and metro access networks.
Product Details
| Specification | Description |
| Product Model | GLC-LH-SMD |
| Form Factor | SFP (Small Form-Factor Pluggable) |
| Interface Type | 1000BASE-LX/LH |
| Data Rate | 1 Gbps |
| Wavelength | 1310 nm |
| Fiber Type | Single-Mode Fiber (SMF) |
| MMF Compatibility | Yes, with mode-conditioning patch cable |
| Max Distance | 10 km (SMF), 550 m (MMF with MCP) |
| Connector Type | LC duplex |
| Digital Optical Monitoring | Yes (DOM supported) |
| Hot Swappable | Yes |
| Operating Temperature | 0°C to 70°C |
| Compliance | IEEE 802.3z, RoHS |
| Cisco Compatibility | Cisco Catalyst, ISR, Nexus, ASR, and more |
Product Features
Supports Gigabit Ethernet over single-mode fiber up to 10 km
Compatible with MMF when using a mode-conditioning patch cord
Equipped with DOM for real-time monitoring of optical parameters
Operates at 1310 nm, suitable for long-distance and metro applications
Hot-swappable SFP for flexible deployment and minimal downtime
Ideal for enterprise networks, campus backbones, and service providers
Similar Models Comparison
| Model | Data Rate | Interface | Fiber Type | Max Distance | Wavelength | DOM | Connector |
| GLC-LH-SMD | 1 Gbps | 1000BASE-LX/LH | SMF/MMF | 10 km (SMF) | 1310 nm | Yes | LC |
| GLC-LH-SM | 1 Gbps | 1000BASE-LX/LH | SMF/MMF | 10 km (SMF) | 1310 nm | No | LC |
| GLC-SX-M MD | 1 Gbps | 1000BASE-SX | MMF | 550 m | 850 nm | Yes | LC |
| GLC-ZX-SMD | 1 Gbps | 1000BASE-ZX | SMF | 70–80 km | 1550 nm | Yes | LC |
| GLC-BX-D | 1 Gbps | 1000BASE-BX | SMF | 10 km | 1490/1310 | No | LC |
Latest Cisco 1G SMF SFP Transceivers
| Model | Fiber Type | Distance | Wavelength | DOM | Use Case |
| GLC-LH-SMD | SMF | 10 km | 1310 nm | Yes | Long-reach enterprise and campus |
| GLC-ZX-SMD | SMF | 70–80 km | 1550 nm | Yes | Metro or long-haul fiber links |
| GLC-BX-D/U | SMF | 10 km | 1490/1310 | No | Bidirectional fiber connections |
