Cisco

Cisco QSFP-100G-B20D4-I | 100G | QSFP28 | 100GBASE-BiDi (LWDM) | 1271–1331nm | 20km | LC simplex | downstream

SKU:QSFP-100G-B20D4-I

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Description

100G QSFP28 BiDi transceiver for single-fiber operation up to 20 km over SMF. This is the downstream unit of a directional pair and must be matched with the corresponding upstream module at the far end. Ideal for conserving fiber and extending 100GbE over metro or campus spans.

Features

- Halves fiber usage with single-strand 100G operation
- 20 km reach for campus and metro links
- LWDM multi-wavelength design for high capacity over one fiber
- Simple LC simplex connectivity
- DOM/DDM for real-time link monitoring

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: Do I need a pair of modules for a link?
A: Yes. Use this downstream unit on one end and the matching upstream unit on the other end to form a complete single-fiber 100G link.

Q: Can I run this over duplex fiber?
A: It is designed for single-strand (simplex) SMF. Duplex can be used if you dedicate one strand and leave the other unused.

Q: Is additional CWDM/DWDM equipment required?
A: No external mux is required; the LWDM wavelengths are handled within the modules.

Q: Will this work in any QSFP28 100G port?
A: It is intended for QSFP28 100GbE ports. Ensure the far end uses the complementary upstream BiDi module.

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: Use with matching 100G BiDi upstream module at the remote end

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