Cisco SFP-10G-ER40 Compatible 10GBASE-ER SFP+ 1310nm 40km DOM Duplex LC SMF Optical Transceiver Module

Overview

This SFP+ module is a high-performance, extended-reach optical transceiver engineered as a fully compatible alternative to the Cisco SFP-10G-ER40. It is designed to the 10GBASE-ER standard, providing a reliable 10 Gigabit Ethernet connection over distances of up to 40 kilometers (approximately 25 miles). The module utilizes a high-quality 1310nm Externally Modulated Laser (EML) transmitter and a sensitive APD (Avalanche Photodiode) receiver to achieve this extended reach over standard single-mode fiber (SMF).

Plugging into any SFP+ compliant port, it provides a Duplex LC connector interface for the fiber connection. With built-in Digital Optical Monitoring (DOM/DDM) support, network administrators can access real-time diagnostic information such as temperature, laser power, and signal strength. This module is an ideal solution for service provider networks, metropolitan area network (MAN) rings, and inter-building campus backbones where long-distance 10Gbps connectivity is essential.

Key Features

• 100% compatible with Cisco platforms that support the SFP-10G-ER40 module.
• Standard: Compliant with IEEE 802.3ae 10GBASE-ER.
• Extended Reach: Achieves up to 40km over single-mode fiber (G.652).
• Wavelength: Operates at a nominal wavelength of 1310nm.
• Connector: Standard Duplex LC optical interface.
• High-Performance: Features an EML transmitter and APD receiver.
• DOM/DDM Support: Enables real-time digital diagnostics.
• Hot-pluggable SFP+ form factor for easy installation and maintenance.

Applications

The SFP-10G-ER40 compatible module is perfectly suited for:

• Long-haul data center interconnects (DCI).
• Service provider and Metro Ethernet deployments.
• Campus and enterprise backbone links between buildings or sites.
• 10G Fibre Channel (10GFC) applications requiring long distance.
• Any 10GbE network application requiring a link length beyond the 10km limit of LR optics.

Specifications

Cross-Platform Compatibility

Programmed for seamless integration with Cisco equipment, this module’s adherence to MSA standards ensures it can also be deployed in networking hardware from other major manufacturers that support the 10GBASE-ER standard.

FAQ (Technical & Product Questions)

1. What is the difference between SFP-10G-ER and SFP-10G-LR modules?

The primary difference is the reach. SFP-10G-LR (Long Reach) modules are designed for distances up to 10km, while SFP-10G-ER (Extended Reach) modules are designed for distances up to 40km. ER modules use more powerful lasers (EML) and more sensitive receivers (APD) to achieve this longer distance, resulting in a higher optical power budget.

2. Can I use an SFP-10G-ER40 module for a short-distance link, like 2km?

Yes, but it is not recommended without proper care. The powerful laser in an ER module can overwhelm, or “overload,” the receiver on the other end of a very short link. This can cause errors or even damage the receiver. For links less than 20km, it is often necessary to use an in-line optical attenuator to reduce the signal strength to a safe level for the receiver.

3. What kind of fiber patch cable is required for this SFP-10G-ER40 module?

You should use a standard single-mode fiber (SMF) patch cable, typically OS1 or OS2 grade, terminated with Duplex LC/UPC (blue) connectors.

4. Why is the SFP-10G-ER40 more expensive than an SFP-10G-LR module?

The cost difference is due to the more complex and higher-performance components required for the 40km reach. ER modules use an Externally Modulated Laser (EML) and an Avalanche Photodiode (APD) receiver, which are more expensive to manufacture than the DFB laser and PIN photodiode used in LR modules.

5. Is this module compatible with SFP ports?

No. This is an SFP+ (Enhanced Small Form-factor Pluggable) module designed for 10Gbps data rates. It will physically fit in a standard 1G SFP port, but it will not link or operate. It must be used in an SFP+ or SFP28 port that supports 10Gbps operation.