100G QSFP28 SR BIDI Compatible Transceiver - Dual Rate 40G/100G

In this review the 100G QSFP28 SR BIDI is evaluated as a practical, cost-aware option for data centers and enterprise network upgrades that need dual-rate optical links. The reviewer finds the module useful for teams that require a hot-pluggable, dual-wavelength Bi-Directional solution because it supports both 40G and 100G operation and uses LC duplex multimode fiber for up to 100 m. For anyone migrating switch ports or consolidating fiber runs, the main reason to buy is the module's ability to carry full 100Gbps over MMF while remaining Cisco-compatible and offering on-board digital diagnostics.

Key Features

• Dual-rate operation: Supports both 40G and 100G bit rates so the same transceiver can be used during phased upgrades and mixed-rate environments.
• Bi-Directional optics: Uses dual wavelength VCSEL BIDI lanes at 850nm and 900nm to transmit over a two-fiber duplex LC multimode link, saving fiber pairs in crowded ducts.
• Hot pluggable: The QSFP28 form factor allows live replacement and quick swaps without shutting down ports, reducing maintenance windows.
• Digital diagnostics: Supports DOM via I2C as specified by QSFP28 MSA so administrators can monitor temperature, voltage and optical power remotely.
• Compatibility: Coded for Cisco QSFP-40/100-SRBD compatibility, making it straightforward to deploy in Cisco switch fleets that accept coded modules.
• Reach for MMF: Rated for up to 100 m on multimode fiber, providing practical coverage for data center rows and campus links.

Who It's For

The 100G QSFP28 SR BIDI is aimed at network engineers and data center operators who need a compact, fiber-saving transceiver that supports both current 40G equipment and higher density 100G optics. It is a good pick where reducing fiber count matters and when equipment is compatible with QSFP-40/100-SRBD coded modules.

Those who should look elsewhere include users needing single-mode long-haul links, CWDM/DWDM compatibility, or modules with vendor-specific warranty bundling; this product is focused on multimode, short-range Ethernet inside data centers and enterprise cores.

Pros & Cons

Pros

• Delivers full-duplex 100Gbps over MMF while also supporting 40Gbps, easing staged upgrades.
• Hot-pluggable QSFP28 form factor simplifies replacements and maintenance in live networks.
• On-board digital diagnostics provide operational visibility for troubleshooting and capacity planning.

Cons

• Limited to multimode fiber at 850nm and 900nm with a 100 m reach, so it is not suitable for long-distance or single-mode spans.

Specifications

Our Verdict

The 100G QSFP28 SR BIDI is a practical, good-value transceiver for data centers and enterprise networks that need to conserve fiber while moving to 100Gbps. Its dual-rate capability and QSFP28 hot-pluggable design make it useful during upgrades, and the inclusion of digital diagnostics helps keep operations measurable. Choose it if your environment uses multimode LC duplex links and requires Cisco-compatible coding; look elsewhere for long-reach single-mode needs.

Frequently Asked Questions

Can this transceiver be used in existing 40G QSFP+ ports?
Yes, it supports dual-rate operation at 40G and 100G, which allows use in mixed-rate deployments where the host supports the coding.

What fiber and connector type does it require?
The module uses duplex LC connectors on multimode fiber and is rated to 100 m reach on MMF.

Does it provide monitoring information?
Yes, digital diagnostics monitoring (DOM) is available via the standard QSFP28 I2C interface for temperature, voltage and optical power.