010-151 · Question #71
What is the wire transmission speed for 100GBASE-ER4 Ethernet?
The correct answer is D. 100 Gb/s. The '100G' prefix in 100GBASE-ER4 directly encodes the wire speed of 100 Gigabits per second, following the IEEE Ethernet standard naming convention.
Question
What is the wire transmission speed for 100GBASE-ER4 Ethernet?
Options
- A100 Mb/s
- B1 Gb/s
- C10 Gb/s
- D100 Gb/s
How the community answered
(14 responses)- A7% (1)
- B14% (2)
- C7% (1)
- D71% (10)
Why each option
The '100G' prefix in 100GBASE-ER4 directly encodes the wire speed of 100 Gigabits per second, following the IEEE Ethernet standard naming convention.
100 Mb/s corresponds to Fast Ethernet standards such as 100BASE-TX, which use a bare '100' prefix without the 'G' multiplier present in this standard's name.
1 Gb/s corresponds to Gigabit Ethernet standards like 1000BASE-T or 1000BASE-SX, which carry a '1000' or '1G' designation, not '100G'.
10 Gb/s corresponds to 10 Gigabit Ethernet standards such as 10GBASE-SR or 10GBASE-LR, which carry a '10G' prefix rather than the '100G' designation seen here.
100GBASE-ER4 is defined under IEEE 802.3ba, where '100G' designates 100 Gbps aggregate transmission speed. The signal is distributed across four optical wavelengths (1271, 1291, 1311, and 1331 nm), enabling extended reach of up to 40 km on single-mode fiber.
Concept tested: 100 Gigabit Ethernet standard naming and wire speed
Source: https://www.ieee802.org/3/ba/
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