Cisco SFP-10G-LRM Compatible10GBASE-LRM SFP+ 1310nm 220m DOM Duplex LC MMF/SMF Optical Transceiver Module

Overview

The SFP-10G-LRM Compatible transceiver is the definitive solution for enterprises looking to upgrade existing networks to **10 Gigabit Ethernet** without the massive expense of re-cabling. While standard SFP-10G-SR modules struggle to reach even 30 meters on older “legacy” fiber (OM1/OM2), the **10GBASE-LRM** standard utilizes a **1310nm** wavelength and advanced Electronic Dispersion Compensation (EDC) to guarantee a stable connection up to **220 meters (721 feet)** on almost any grade of Multimode Fiber (MMF).

This module allows network administrators to reuse installed fiber plants (FDDI-grade, OM1, and OM2) that were originally deployed for 100Mbps or 1Gbps networks, instantly boosting their capacity to 10Gbps.

Key Features

• Legacy Fiber Support: Optimized for OM1 (62.5μm) and OM2 (50μm) fiber types, as well as modern OM3/OM4.
• Reach: Consistent **220m** distance across all supported multimode fiber types.
• Wavelength: 1310nm Fabry-Perot (FP) laser.
• Standard Compliance: Fully compliant with IEEE 802.3aq 10GBASE-LRM and SFF-8431 MSA.
• Connector: Duplex LC interface.
• Monitoring: Includes Digital Optical Monitoring (DOM/DDM) to track signal quality and module health.

Applications

The SFP-10G-LRM is specifically designed for “Brownfield” deployments:

• Building Risers: Connecting closets in older buildings where OM1 or OM2 fiber was installed in the 1990s or early 2000s.
• Campus LANs: Upgrading 1G backbones to 10G on legacy infrastructure.
• Data Centers: Connecting servers or switches over mixed fiber types where SR modules cannot maintain signal integrity.
• Corporate Networks: Cost-effective bandwidth expansion without construction costs.

Specifications

Cross-Platform Compatibility

Our 10GBASE-LRM modules are coded to function seamlessly with a wide range of OEM switches. Note that the host switch must support EDC (Electronic Dispersion Compensation) on the SFP+ port for LRM to function correctly. Compatible brands include:

Important Installation Note: Mode Conditioning Patch Cables

When using 10GBASE-LRM modules with legacy OM1 (62.5 micron) or OM2 (50 micron) fiber, it is highly recommended (and often required) to use a Mode Conditioning Patch (MCP) cable at both ends of the link. This specialized patch cord couples the laser precisely to avoid “Differential Mode Delay” (DMD), ensuring the signal does not degrade over the distance. For OM3/OM4 fiber, standard patch cords are sufficient.

FAQ (Technical & Product Questions)

1. What is the difference between SFP-10G-SR and SFP-10G-LRM?

SR (Short Reach) uses an 850nm laser and is optimized for modern OM3/OM4 fiber (reaching 300m-400m). It performs very poorly on old OM1 fiber (reaching only ~33m). LRM (Long Reach Multimode) uses 1310nm and is designed specifically to reach 220m on both old and new fiber types.

2. Do I always need a Mode Conditioning Patch (MCP) cable?

If you are using OM1 or OM2 fiber, YES, an MCP cable is strongly recommended to prevent data errors. If you are using modern OM3 or OM4 fiber, you can typically use standard patch cables.

3. Can I use this module with Single-Mode Fiber (SMF)?

While the 1310nm wavelength allows it to technically pass light through SMF, the LRM standard is optimized for Multimode. For Single-Mode connections, you should use the SFP-10G-LR (10km) module instead for guaranteed performance.

4. Does my switch support LRM?

Most enterprise-grade switches support LRM, but the port requires specific hardware known as EDC (Electronic Dispersion Compensation). Please check your switch datasheet to confirm it supports SFP-10G-LRM modules.

5. Is this module hot-swappable?

Yes, the SFP-10G-LRM is fully hot-swappable. You can install or remove it without powering down the networking equipment.