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 1000base-FX Ehernet interface
This device provides 1000Base single-mode dual-
fiber SC module, and multi-mode like LC, ST as optional.
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 inter-mode 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, it’s
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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