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Exam HPE7-A03 Topic 3 Question 62 Discussion

Actual exam question for HP's HPE7-A03 exam
Question #: 62
Topic #: 3
What is true about 1000 Base-LX single mode transceivers?

Suggested Answer: C Vote an answer

The 1000Base-LX standard is designed primarily for single-mode fiber (SMF) but can also operate over multi- mode fiber (MMF). However, when using a 1000Base-LX (long wavelength) transceiver with older multi- mode fiber like OM1 ($62.5/125$ $\mu m$), a specific technical issue called Differential Mode Delay (DMD) occurs.
* Mode Conditioning Patch (MCP) Cable: To mitigate DMD, an MCP cable must be used when connecting a 1000Base-LX transceiver to OM1 or OM2 multi-mode fiber for distances up to 550 meters. This cable offsets the laser launch into the fiber core to ensure the signal propagates correctly.
* OM1 Specifics: OM1 fiber has a smaller bandwidth-distance product compared to newer standards.
Without the MCP, the signal distortion makes the 550m distance unattainable or unreliable.
* Comparison: * OS1 (Option D): This is single-mode fiber. 1000Base-LX transceivers are native to single-mode and do not require mode conditioning cables for OS1/OS2.
* OM5 (Option A): While technically possible, MCPs are typically associated with the legacy
$62.5$ $\mu m$ (OM1) and $50$ $\mu m$ (OM2) fiber types.
* OM2 (Option C): Standard practice dictates that OM2 also requires an MCP for 1000Base-LX at
550m to avoid DMD, making "doesn't need" incorrect.

by Edith at Oct 14, 2026, 09:24 PM

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Here are all the actual test exam dumps for IT exams. Most people prepare for the actual exams with our test dumps to pass their exams. So it's critical to choose and actual test pdf to succeed.

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