6
For the MDI-X port of a switch or hub, cross lines are used: 1-3, 2-6,
3-1, 6-2, 4-7, 5-8, 7-4, 8-5.10Base-T/100Base-T (X) pins are defined as
follows:
Note: "Tx ±" refers to send data, "Rx ±" refers to received data,
and "-" refers to unused data.
5.2 100base-FX Ethernet interface
This device provides 100Base SFP slot
5.2.1 Patch cord classification
According to the transmission mode of light in the fiber, it can be
divided into multi-mode fiber and single mode fiber. Multimode fiber
has a thick glass core (50 or 62.5μm), which can transmit light in
various modes. However, the high intermode dispersion limits the
frequency at which digital signals can be transmitted, so multimode
fibers can be transmitted over relatively close distances (typically only
a few kilometers).The single mode fiber has a very thin glass core (core
diameter, usually 9 or 10μm) and can transmit only one mode of light.
Therefore, its inter - module dispersion is very small, and it is suitable
for remote communication. Under normal circumstances, the skin is
orange for multi-mode, yellow for single mode.
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