5
NO.
MDI signal
MDI-X signal
1
TX+
RX+
2
TX-
RX-
3
RX+
TX+
6
RX-
TX-
4
、
5
、
7
、
8
—
—
Note: “TX
±
”transmit data
±
, “RX
±
”receive data
±
, “
—
”not use
MDI
（
straight-through cable
）：
MDI-X
（
Cross-over cable
）：
100Base-FX port
100Base-FX full-duplex SM or MM port, SC/ST type .The fiber port must be used in pair, TX (transmit) port connect remote switch’s RX(receive) port;
RX(receive) port connect remote switch’s TX(transmit) port.
The optical fiber connection supports the line to instruct enhance the reliability of network effectively
.
Suppose
: If you make your own cable, we suggest labeling the two sides of the same line with the same letter (A-to-A and B-to-B, shown as below, or
A1-to-A2 and B1-to-B2).
1
8
