200-150 · Question #229
Which type of cable do you use with a Cisco QSEP 40-Gbps BiDi transceiver?
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
How the community answered
(32 responses)- A88% (28)
- B3% (1)
- C3% (1)
- D6% (2)
Why each option
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.
Cisco QSFP-40G-SR-BiDi transceivers are specifically designed for MMF, using two wavelengths (850 nm TX, 900 nm RX) over OM3 or OM4 multi-mode fiber to achieve full-duplex 40G operation across a single fiber strand per direction.
Active twinax is a copper direct-attach cable used for very short rack-scale connections and cannot interface with an optical BiDi transceiver.
STP is a shielded copper Ethernet cable limited to 100 m and is electrically incompatible with optical transceivers.
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
Source: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-728932.html
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