In MMF OM3 fiber type and SFP28 LC SR transceiver option. What is the maximum distance supported by this setup?

Question

Options

• AUp to 50 meters
• BUp to 70 meters
• CUp to 500 meters
• DUp to 700 meters

• A
  6% (1)
• B
  88% (14)
• D
  6% (1)

Explanation

SFP28 SR (25GBASE-SR) transceivers operating over OM3 multi-mode fiber are standardized by IEEE 802.3by to reach a maximum of 70 meters, making B correct. Option A (50m) understates the capability - while 50m is within the supported range, it's not the maximum. Options C (500m) and D (700m) are far beyond what any SR transceiver can achieve; those distances require LR (Long Range) transceivers on single-mode fiber, which can reach 10km or more. A helpful memory tip: "SR stays short" - SR transceivers are always limited to hundreds of meters at most, and pairing OM3 with SFP28 SR specifically caps out at 70m (upgrade to OM4 to get 100m with the same transceiver type).

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