Cisco SFP-10G-BX80U Compatible SFP+ 10GBASE-BX80-U BiDi 1490nm-TX/1550nm-RX 80km DOM Simplex LC/UPC SMF Optical Transceiver Module

Overview

This is a specialized, high-performance Bi-Directional (BiDi) SFP+ optical transceiver, engineered to be 100% compatible with the Cisco SFP-10G-BX80U. It is designed for long-haul 10 Gigabit Ethernet applications where fiber conservation is critical. This module provides a powerful solution for service providers, metro-area networks, and enterprise backbones by transmitting and receiving data over a single strand of fiber, effectively doubling the capacity of existing fiber infrastructure.

Adhering to the 10GBASE-BX80-U standard, this transceiver utilizes Wavelength Division Multiplexing (WDM) technology. It transmits on a 1490nm wavelength and receives on a 1550nm wavelength, allowing for full-duplex communication over one single-mode fiber (SMF) for distances up to 80 kilometers. For a functional link, this “Upstream” (U) module must be paired with a corresponding “Downstream” (D) module, such as the SFP-10G-BX80D, at the opposite end of the fiber link.

Key Features

• Fully compatible with systems coded for Cisco SFP-10G-BX80U.
• Bi-Directional (BiDi) operation over a single strand of SMF.
• Supports 10Gbps data rates for long-reach applications.
• Transmission distance up to 80km (49.7 miles).
• Transmitter (TX): 1490nm DFB Laser / Receiver (RX): 1550nm APD.
• Single Simplex LC connector for simplified cabling.
• Hot-pluggable SFP+ MSA-compliant form factor.
• Includes Digital Optical Monitoring (DOM/DDM) for link diagnostics.

Applications

The SFP-10G-BX80U compatible module is ideal for network environments where fiber optic cable is limited, congested, or expensive to install. It is commonly deployed in ISP access networks for Fiber-to-the-Home (FTTH), long-haul point-to-point links between data centers or campuses, and metro Ethernet connections. By eliminating the need for a second fiber strand, it enables network upgrades and expansion without the high cost of laying new cable.

Specifications

Cross-Platform Compatibility

While programmed specifically for Cisco compatibility, this SFP-10G-BX80U equivalent module adheres to industry-wide MSA standards, ensuring it can function in a variety of networking platforms that support BiDi optics. Proper functionality depends on pairing it with a compatible downstream (1550nm-TX/1490nm-RX) module. Below are common equivalent part numbers from other vendors:

Advantages

The foremost advantage of using the 10GBASE-BX80-U module is the substantial cost savings on fiber infrastructure. By operating on a single fiber, it effectively doubles the capacity of your existing cable plant and can reduce cabling costs by up to 50% on new installations. This also simplifies cable management and reduces potential points of failure. The extended 80km reach allows for the creation of robust, high-speed links over vast geographical distances, connecting remote sites without the need for expensive repeater equipment.

FAQ (Technical & Product Questions)

1. What is a BiDi transceiver?

A Bi-Directional (BiDi) transceiver uses Wavelength Division Multiplexing (WDM) to send and receive data over a single fiber strand. It has one optical port (a Simplex LC connector) instead of the two found on standard transceivers, making it a fiber-saving technology.

2. Why must this SFP-10G-BX80U module be used in a pair?

A functional link requires a pair of BiDi modules with opposite wavelengths. This “Upstream” (U) module transmits at 1490nm and receives at 1550nm. It must be connected to a “Downstream” (D) module, like the SFP-10G-BX80D, which transmits at 1550nm and receives at 1490nm.

3. What happens if I connect two SFP-10G-BX80U modules together?

If you connect two of the same modules (e.g., two U-modules), a link will not establish. Both modules would be transmitting on the same wavelength (1490nm) and trying to receive on a wavelength (1550nm) that is not being transmitted by the other side.

4. Can I use this SFP+ module in a Cisco switch?

Yes. This transceiver is specifically coded to be recognized as an original Cisco part, ensuring seamless plug-and-play compatibility with Cisco switches, routers, and other devices that support the SFP-10G-BX80U module.

5. What type of fiber optic cable is required for 80km?

To achieve the maximum distance of 80km, you must use a standard G.652 single-mode fiber (SMF) patch cable with Simplex LC connectors. The link budget is designed for this distance, and performance on multi-mode fiber is not possible.

6. What does the “U” in SFP-10G-BX80U stand for?

The “U” stands for Upstream. In BiDi terminology, this typically refers to the module at the subscriber or remote end of the link, while the “D” for Downstream is at the central office or aggregation point. However, the key is simply to ensure one “U” is connected to one “D”.

7. Are Simplex and Duplex connectors interchangeable?

No. This module has a Simplex LC port designed for a single fiber strand. A standard Duplex LC connector, which has two fiber strands joined together, will not physically fit or function with this BiDi transceiver.

8. Does this 80km module work for shorter distances?

Yes, it will work for shorter distances. However, for very short links (less than 20km), the receiver may be overpowered by the strong optical signal. In such cases, an in-line optical attenuator might be necessary to reduce the signal power and prevent receiver damage.