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Zorluk: OrtaPhysical Interface and Cabling Types

A network engineer is selecting physical media and transceiver modules to establish a 1 Gbps backbone link between two switches located in different buildings separated by a distance of 400 meters. Which two transceiver and cabling combinations will successfully support a Gigabit Ethernet link across this distance? (Select two.)

  1. A 1000BASE-LX SFP transceiver connected using single-mode fiber-optic (SMF) cabling.Cevap
  2. A 1000BASE-LX SFP transceiver connected using OM3 multimode fiber-optic (MMF) cabling with a mode-conditioning patch cord.Cevap
  3. C
    A 1000BASE-SX SFP transceiver connected using legacy OM1 (62.5/125 µm) multimode fiber-optic cabling.
  4. D
    A 1000BASE-T SFP transceiver connected using Category 6a unshielded twisted-pair (UTP) copper cabling.
  5. E
    A 1000BASE-ZX SFP transceiver connected using Category 7 shielded twisted-pair (STP) copper cabling.

Cevap

The correct options are the 1000BASE-LX SFP transceiver with single-mode fiber (SMF) cabling, and the 1000BASE-LX SFP transceiver with OM3 multimode fiber (MMF) cabling using a mode-conditioning patch cord.
Both selected options meet or exceed the 400-meter distance constraint. 1000BASE-LX transceivers operating over single-mode fiber can transmit up to 5 kilometers. Additionally, 1000BASE-LX transceivers can achieve up to 550 meters over multimode fiber when paired with a mode-conditioning patch cord.

Adım Adım Çözüm

1
Identify the distance constraint and speed requirement from the scenario.
The link distance is 400 meters and the required bandwidth is 1 Gbps (Gigabit Ethernet).
Selection of transceivers and cable types depends directly on distance limits defined by IEEE 802.3 standards.
2
Evaluate copper cabling limitations.
Category 6a UTP (1000BASE-T) is limited to 100 meters total channel length.
Copper cabling cannot span 400 meters without active repeaters or switches in between.
3
Evaluate short-reach optical transceiver specifications (1000BASE-SX).
1000BASE-SX over OM1 (62.5/125 µm) MMF supports a maximum distance of 275 meters.
Short-wavelength optics (850 nm) attenuate faster over legacy multimode fiber cores.
4
Evaluate long-reach optical transceiver specifications (1000BASE-LX).
1000BASE-LX over SMF supports up to 5 km. 1000BASE-LX over laser-optimized MMF (using a mode-conditioning patch cord) supports up to 550 meters.
Long-wavelength optics (1310 nm) satisfy the 400-meter requirement across both SMF and suitably conditioned MMF media.

Anahtar Kavram

Gigabit Ethernet transceiver distance limits and fiber media specifications (1000BASE-LX vs 1000BASE-SX vs 1000BASE-T)
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Konular

Physical Interface and Cabling Types

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