27
Figure 30 XFP transceiver module
Figure 31 SFP+ transceiver module
Fiber cable overview
CAUTION:
•
Never use excessive force when you insert or remove a fiber connector.
•
Never use excess force when you pull, press, or extrude the fiber.
Optical fibers can be classified into single-mode optical fibers and multi-mode optical fibers. A
single-mode optical fiber carries only a single ray of light, and a multi-mode optical fiber carries
multiple modes of lights.
Table 11 Characteristics of single-mode and multi-mode optical fibers
Item
Single-mode optical fiber Multi-mode
optical
fiber
Core
Small core (10 micrometers or less)
Larger core than single-mode
optical fiber (50 micrometers, 62.5
micrometers or greater)
Dispersion Less
dispersion
Allows greater dispersion and
therefore, signal loss occurs
Light source and
transmission distance
Users lasers as the light source often
within campus backbones for distance
of several thousand meters
Uses LEDs as the light source
often within LANs or distances of
a several hundred meters within a
campus network
lists the allowed maximum tensile load and crush load for the fiber.
