Cisco GLC-BX-U80 / GLC-BX-D80 Compatible 1.25G SFP BIDI Transceiver

In this review the author tests the Jeirdus-compatible SFP pair designed for Cisco GLC-BX-U80 and GLC-BX-D80 modules and finds it most useful for network engineers needing reliable, long-reach bidirectional optics without vendor lock-in. The bottom line: these SFP BIDI transceivers deliver stable 1.25Gbps connectivity over a single LC for up to 80km and include DDM/DOM monitoring, so they are a practical option for field upgrades and spare inventory where Cisco compatibility and tested performance matter.

Key Features

• Compatibility: Built to work with Cisco GLC-BX-U80 and GLC-BX-D80, reducing integration time with common switches and routers.
• Bidirectional WDM: Supports 1000BASE-BX-U and 1000BASE-BX-D to send and receive over a single LC fiber for simpler cabling.
• Long reach: Rated to reach up to 80km, enabling long-distance links between data centers or remote sites without additional amplification.
• DDM/DOM support: Digital diagnostics provide real-time monitoring of optical parameters for easier maintenance and troubleshooting.
• Quality assurance: Each transceiver is individually tested in Jeirdus compatibility lab to meet coding requirements for many switch and router brands.
• Warranty and compliance: Constructed from 100% new materials with CE and FCC indications and backed by a 3 year replacement plus a lifetime warranty.

Who It's For

Network administrators and installers who need a cost-effective, vendor-compatible replacement for Cisco GLC-BX series modules will appreciate these transceivers. They suit point-to-point fiber links, campus backbone extensions, and service provider drops that require simplex LC cabling and long reach without changing existing optics.

Those who should look elsewhere are users requiring multi-rate SFPs beyond 1.25Gbps, or environments that mandate original OEM-labeled optics for strict asset tracking or warranty terms. For basic Gigabit fiber links and spare pool inventory, this product is a strong fit.

Pros & Cons

Pros

• Compatible with Cisco GLC-BX-U80 and GLC-BX-D80, easing deployment in mixed environments.
• Supports up to 80km over a single LC using bidirectional WDM, cutting fiber cabling needs.
• Includes DDM/DOM for live monitoring, which helps with troubleshooting and maintenance.
• Each unit is tested in a compatibility lab and comes with a replacement warranty and lifetime support.

Cons

• Operates at a fixed 1.25Gbps rate, so it is not suitable for networks that require multi-rate flexibility.
• Not an OEM-labeled Cisco part, which may matter for organizations with strict vendor policies.

Specifications

Form Factor	SFP (1.25G)
Compatibility	Cisco GLC-BX-U80 and GLC-BX-D80
Wavelengths	Up TX1490nm / RX1550nm; Down TX1550nm / RX1490nm
Connector	Single LC simplex
Distance	Up to 80km
Features	Bidirectional WDM, DDM/DOM support
Materials & Compliance	100% new materials, CE, FCC; 3 year replacement + lifetime warranty

Our Verdict

The Jeirdus-compatible GLC-BX-U80/GLC-BX-D80 SFP pair is a practical, well-tested alternative for Gigabit long-reach links where Cisco compatibility and DDM monitoring are required. It offers strong value for network teams that need dependable 80km simplex connections without OEM pricing, though organizations demanding multi-rate optics or strict OEM-only inventory should consider other options.

Frequently Asked Questions

Are these transceivers compatible with Cisco switches?
Yes, they are designed for compatibility with Cisco GLC-BX-U80 and GLC-BX-D80 modules and are verified in Jeirdus compatibility labs.

Do these modules support diagnostic monitoring?
Yes, they include DDM/DOM support to monitor optical parameters such as transmit power and temperature.

What is the maximum supported distance?
Each transceiver is rated to reach up to 80km over singlemode fiber using a simplex LC connection.