thinQmaster Virtual testing partner Adaptive practice exams that find your weak spots and drill them. Every answer explained. From $69
Enroll

thinQmaster

Find your exam

Five questions free, before you decide.

Step 1 · choose a vendor

In one of our camps? Your practice exams come with the tuition — they are on your study page already.

Networking Fundamentals · Intermediate

1000BASE-SX

Gigabit Ethernet over multimode fiber using 850 nm short-wavelength light, reaching about 220-550 m depending on fiber grade.

Definition

1000BASE-SX is common for building backbone links on OM1 through OM4 multimode fiber, typically with LC connectors on SFP transceivers. Reach is about 275 m on OM1 and 550 m on OM2 or better.

Example

An SFP labeled 1000BASE-SX connects two switches across a building with OM3 fiber.

Exam tip

S = short wavelength = multimode = 850 nm.

Related terms