Comnet 1000fx 1490nm 20km LC 1 Fiber Pair with SFP BXB MSA Compliant Cisco Compatible - SFP-BX-U

Comnet SFP-BX-U 1000BASE-FX Gigabit Singlemode Fiber Module

The Comnet SFP-BX-U is a 1000BASE-FX small form-factor pluggable module designed for long-distance fiber deployments where you need gigabit ethernet over singlemode fiber without swapping hardware. This is a 1-fiber, 20-kilometer reach SFP that pairs with the SFP-BX-D to handle duplex communication — the right choice when you're running fiber backbone links between buildings, across campuses, or bridging industrial surveillance networks where distance and reliability matter.

Overview

The SFP-BX-U operates at 1310/1490nm wavelength using singlemode fiber, delivering stable 1000 Mbps throughput across distances up to 20 kilometers. It's IEEE 802.3 compliant and MSA-compatible, meaning it integrates into any managed or unmanaged Comnet switch, media converter, or third-party equipment that accepts standard SFP modules — including Cisco-compatible gear. The module requires no in-field adjustments; you insert it into a compatible SFP slot, and it negotiates automatically. Industrial hardening means the module is rated for temperature and vibration stresses typical of surveillance and utility installations.

Key Features

• 1000BASE-FX Gigabit Performance: Delivers full gigabit throughput (1000 Mbps) over fiber, eliminating copper-distance bottlenecks. If you're linking a busy surveillance NVR to a remote encoding unit or feeding video streams across a campus backbone, gigabit speed ensures no dropped frames or buffer delays due to link saturation.
• 20-Kilometer Singlemode Reach: Singlemode fiber at 1310/1490nm wavelength carries your signal 20 kilometers without active repeaters. That distance lets you bridge widely separated sites — industrial campuses, utility substations, or security perimeters — in a single fiber run. Multimode SFPs max out around 2 km; singlemode is the only way to go distance.
• 1-Fiber Design (Pair with SFP-BX-D): Uses a single fiber strand in each direction (paired with a complementary module at the far end). Reduces fiber count and installation cost compared to dual-fiber modules when you're running existing single-strand routes or want to minimize trench work. The SFP-BX-D is the matching transmit/receive counterpart.
• LC Connector: Standard LC (Lucent Connector) port is the industry default for SFP modules. Your fiber patch cables use LC connectors; no adapter fuss. If you need SC connectors instead, Comnet offers variant models in the same family.
• MSA Compliance and Cisco Compatibility: Meets Multi-Source Agreement standards, so the module works in any vendor's SFP-capable equipment — Comnet, Cisco, and industrial switches alike. No vendor lock-in on fiber modules. You get hardware interchangeability across your network infrastructure.
• Industrial Hardening and Limited Lifetime Warranty: Built for dusty, temperature-variable, vibration-prone environments (factories, utility substations, outdoor cabinets). The module carries a Limited Lifetime Warranty, backing its reliability through years of continuous operation. No re-qualification needed if your equipment moves between sites.

Integration & Compatibility

The SFP-BX-U installs into any SFP cage on a managed or unmanaged ethernet switch, media converter, or network interface card. It's particularly useful in Comnet industrial switch products and third-party equipment carrying Cisco SFP compatibility badges. When deploying long-range fiber, pair this module with singlemode patch cables (standard LC-to-LC, OS2 or better) and ensure your far-end equipment has the matching SFP-BX-D module for proper duplex communication. If you're extending IP camera feeds across fiber, the gigabit throughput accommodates multiple 4K or 1080p streams without congestion, and the 20 km reach means you can position cameras at remote buildings or access points far from your central NVR.

For surveillance backbone integration, pair the SFP-BX-U with industrial PoE switches or media converters to power remote devices at the far end of your fiber run. The fiber itself carries no power, but a PoE injector on the copper side can energize a remote camera or access point. This modularity is key to distributed security architectures.

What's in the Box

The SFP-BX-U arrives as a single module ready to install — no cables, adapters, or mounting hardware are included. You supply LC-LC singlemode patch cables, connect the module to your switch or media converter SFP cage, and verify link status via the LED indicator on the module's front panel.

Frequently Asked Questions

Q: Does the SFP-BX-U work with non-Comnet switches?

A: Yes. The module is MSA-compliant and compatible with any equipment that accepts standard SFP modules, including Cisco switches and industrial network devices. Verify the switch supports 1000BASE-FX singlemode (some switches support only multimode or copper SFPs).

Q: What's the difference between SFP-BX-U and SFP-BX-D?

A: They are a pair. The SFP-BX-U transmits at 1490nm and receives at 1310nm; the SFP-BX-D does the opposite. You use one of each at opposite ends of the fiber link to achieve duplex communication over a single strand.

Q: Can I use this module with multimode fiber?

A: No. The SFP-BX-U is engineered for singlemode fiber only. Attempting to use it with multimode fiber will result in signal degradation and link failure. Comnet offers separate multimode SFP variants if your infrastructure uses multimode fiber.

Q: What is the warranty on the SFP-BX-U?

A: The module is covered by Comnet's Limited Lifetime Warranty, which backs material and workmanship defects. Refer to the warranty terms or contact support for details on coverage conditions.

Q: Does the SFP-BX-U support DDI (Dual Data Interface)?

A: Yes. The module supports DDI, which allows compatibility with certain legacy or specialized equipment configurations. Standard installations will not require DDI mode.

Q: What monitoring or management features does the SFP-BX-U offer?

A: The module itself has no management interface — it is a passive optical device. Your switch or media converter can monitor the SFP's link status and signal strength via SNMP or the device's web interface (if the host equipment supports SFP diagnostics). This is typical for all plug-in SFP modules.

Eden Phillips

The Comnet SFP-BX-U is a workhorse for industrial surveillance backhauls where you need to stretch gigabit connectivity across real distance without active equipment in the middle. The 20-kilometer singlemode reach and 1000 Mbps throughput make this the right module when you're binding remote camera compounds or utility substations into a central NVR — singlemode fiber is the only practical way to cover that distance, and the SFP-BX-U does it without complexity.

Technical Highlights:

• 1000BASE-FX at 20 km: Singlemode fiber at 1310/1490nm wavelength gets you to 20 kilometers with zero repeaters or amplifiers. Multimode maxes out around 2 km; if you're bridging a campus or crossing between buildings more than a few hundred meters apart, singlemode is mandatory. The gigabit throughput accommodates multiple surveillance streams without bottlenecking your link.
• 1-Fiber Duplex (Pair with SFP-BX-D): One fiber strand, two directions of traffic — the SFP-BX-U transmits at 1490nm while receiving at 1310nm, paired with a complementary SFP-BX-D at the far end. This cuts fiber strand count in half compared to dual-fiber designs, saving trenching labor and installation cost if you're retrofitting existing single-strand runs or working with tight conduit space.
• MSA Compliance and Passive Design: No in-field adjustments, no firmware updates, no management interface — you plug it in and it works. MSA compliance means it negotiates with any vendor's SFP-capable switch or media converter (Cisco, Comnet, industrial brands). Industrial hardening and a Limited Lifetime Warranty back multi-year, 24/7 operation without re-qualification.

Deployment Considerations:

• Always verify that your host switch or media converter supports 1000BASE-FX singlemode mode — not all SFP cages support all optical types. A quick datasheet check saves a site visit when the module doesn't light up.
• Match the SFP-BX-U with the SFP-BX-D at the far end; using two of the same model or mismatching wavelengths will break the link. Label your modules and fiber runs clearly so you don't reverse them during maintenance.

This is the module to reach for in industrial surveillance backbones, utility metering networks, and distributed access-control architectures where fiber distance and reliability are non-negotiable. A campus-wide fiber infrastructure with central NVR and remote cameras across 15 km of real estate — this is the right tool.