200-150 · Question #159
Which advantage does the bidirectional Cisco QSFP 40-GBPs BiDi transceiver provide?
The correct answer is D. It enables the reuses of the existing 10-gigabit duplex MMF infrastructure for migration to 40. The Cisco QSFP BiDi transceiver uses bidirectional wavelength multiplexing over a single fiber strand, enabling existing 10G duplex multimode fiber infrastructure to be reused for 40G migration.
Question
Which advantage does the bidirectional Cisco QSFP 40-GBPs BiDi transceiver provide?
Options
- AIt supports a breakout connection with a 40-gigabit QSFP port on one end that connections to
- Bit supports link lengths up to 40 km over single-mode fiber with duplex line card connectors.
- CIt supports dedicated fabric-extender transceiver modules that connect to fabric links ( that I, links
- DIt enables the reuses of the existing 10-gigabit duplex MMF infrastructure for migration to 40
How the community answered
(40 responses)- A3% (1)
- B3% (1)
- C5% (2)
- D90% (36)
Why each option
The Cisco QSFP BiDi transceiver uses bidirectional wavelength multiplexing over a single fiber strand, enabling existing 10G duplex multimode fiber infrastructure to be reused for 40G migration.
Breakout functionality describes a different transceiver type that splits one 40G QSFP port into four independent 10G SFP+ ports, which is unrelated to the BiDi bidirectional wavelength design.
40 km reach over single-mode fiber describes LR4 or ER4 transceivers; BiDi is designed for short-range multimode fiber, not long-haul single-mode.
Fabric-extender transceiver modules are specific to the Cisco FEX architecture for connecting FEX units to parent switches, which is a completely separate use case from BiDi wavelength multiplexing.
The BiDi transceiver transmits on one wavelength and receives on another over a single MMF strand, so a standard duplex 10G MMF link with two fiber strands carries a full 40G BiDi connection without re-cabling. This wavelength-division approach maps directly onto the physical layout of existing 10G duplex MMF installations. The result is a cost-effective migration path to 40G that avoids replacing cabling infrastructure.
Concept tested: Cisco BiDi transceiver 40G MMF reuse capability
Source: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-728113.html
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