Cisco

Cisco QSFP-100G-B20U4-I | 100G | QSFP28 | 100GBASE-BiDi (LWDM) | 1271–1331nm | 20km | LC simplex | upstream

SKU:QSFP-100G-B20U4-I

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Description

100G QSFP28 BiDi transceiver for 20 km single-fiber links over SMF. This is the upstream unit and must be paired with the matching downstream module at the opposite end. Ideal for fiber-constrained paths where full 100GbE is needed on a single strand.

Features

- Single-fiber 100G connectivity to conserve plant
- 20 km reach with LC simplex interface
- LWDM multi-wavelength design
- Hot-swappable QSFP28 with DOM/DDM
- Simplifies metro/campus upgrades where fiber is scarce

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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FAQs

Technical Specifications

FAQs

Q: Can I mix upstream and downstream BiDi modules from the same series?
A: Yes. A working link requires one upstream and one downstream unit from the same BiDi series.

Q: What fiber and connector are needed?
A: Single-mode fiber (G.652/G.657) with an LC simplex presentation.

Q: Do I need FEC enabled?
A: Enabling RS-FEC on the host is recommended to ensure robust 20 km performance.

Q: Is this compatible with standard 100GbE QSFP28 ports?
A: Yes, it is intended for QSFP28 100GbE ports; pair with the complementary downstream unit.

Technical Specifications

- Data rate: 100 Gb/s
- Form factor: QSFP28
- Optical type: Bidirectional (BiDi), single-fiber
- Wavelength band: LWDM 1271–1331 nm (directional)
- Reach: up to 20 km over SMF
- Connector: LC simplex
- Fiber type: ITU-T G.652/G.657 single-mode
- Host electrical interface: 4 x 25G
- FEC: Host RS-FEC recommended for long-reach performance
- Digital diagnostics (DOM/DDM) supported
- Note: Requires matching 100G BiDi downstream module at the far end

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