1000Base-SX Uses Multi-Mode Fiber | Generated by AI
Thank you for sharing this question. Let me explain why the correct answer is C (Multi-mode Fiber) instead of B.
Understanding 1000Base-SX Standard
The components of 1000Base-SX:
- 1000 = 1 Gigabit/s (one billion bits per second)
- Base = Baseband transmission
- SX = Short wavelength
Key Difference: SX vs LX
There are two main optical fiber versions for 1000Base Ethernet:
1000Base-SX (Short Wavelength)
- Wavelength: 850 nm
- Transmission medium: Multi-mode Fiber
- Maximum distance: 275m (full-duplex) or 550m (half-duplex)
- Lower cost, suitable for short-range applications
1000Base-LX (Long Wavelength)
- Wavelength: 1310 nm
- Transmission medium: Single-mode Fiber
- Maximum distance: 5 km
- Higher cost, suitable for long-distance applications
Why Does SX Use Multi-mode Fiber?
The characteristics of short-wavelength lasers (850 nm) determine compatibility with multi-mode fiber:
- Modal dispersion in multi-mode fiber is relatively small at 850 nm
- More cost-effective and power-efficient
- Ideal for campus networks and data centers with medium to short-distance transmission
Single-mode fiber is optimized for long wavelengths (1310 nm) and supports much greater transmission distances.
Quick Memory Aid: SX = Short wavelength = Multi-mode fiber; LX = Long wavelength = Single-mode fiber