200-150 Question #229: Real Exam Question with Answer & Explanation

The correct answer is A: MMF. The QSFP 40-Gbps BiDi transceiver uses wavelength-division multiplexing over multi-mode fiber, transmitting and receiving on different wavelengths through a single fiber pair.

Question

Which type of cable do you use with a Cisco QSEP 40-Gbps BiDi transceiver?

Options

AMMF
Bactive twinax
CSTP
DSMF

Explanation

The QSFP 40-Gbps BiDi transceiver uses wavelength-division multiplexing over multi-mode fiber, transmitting and receiving on different wavelengths through a single fiber pair.

Common mistakes.

B. Active twinax is a copper direct-attach cable used for very short rack-scale connections and cannot interface with an optical BiDi transceiver.
C. STP is a shielded copper Ethernet cable limited to 100 m and is electrically incompatible with optical transceivers.
D. SMF uses a narrow 9-micron core suited for long-distance single-mode optics; the BiDi transceiver requires the larger 50/62.5-micron core of MMF and will not operate over SMF.

Concept tested. Cisco BiDi transceiver fiber media requirements

Reference. https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-728932.html

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