HP Comware-Based Switches Transceiver Modules User Guide

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Attenuation refers to the dissipation of the power of a transmitted signal as it travels over a cable. Attenuation
occurs because signal transmission suffers certain resistance from the cable, which weakens the signals as
they travel over the cable. When signals are transmitted over a very long distance, signal strength decreases
significantly, causing the signal-to-noise ratio to drop below the accepted level. This makes it impossible to
distinguish between signals and noise, resulting in decision errors.
When signals are to be transmitted over a short distance, use copper transceiver modules only.
Connector
Registered Jack-45 (RJ-45) twisted pair connectors are used as connectors for copper transceiver modules.
Figure 3 RJ-45 connector
Table 4 RJ-45 GE connector pin assignment
Pin
Signal
Function
1
MX_0+
Data transmit/receive
2
MX_0-
Data transmit/receive
3
MX_1+
Data transmit/receive
4
MX_2+
Data transmit/receive
5
MX_2-
Data transmit/receive
6
MX_1-
Data transmit/receive
7
MX_3+
Data transmit/receive
8
MX_3-
Data transmit/receive
PIN #8
PIN #1