HP 6125XLG HP Comware-Based Switches Transceiver Modules User Guide - Page 11

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 PIN #8 PIN #1 Table 4 RJ-45 GE connector pin assignment Pin Signal 1 MX_0+ 2 MX_0- 3 MX_1+ 4 MX_2+ 5 MX_2- 6 MX_1- 7 MX_3+ 8 MX_3- Function Data transmit/receive Data transmit/receive Data transmit/receive Data transmit/receive Data transmit/receive Data transmit/receive Data transmit/receive Data transmit/receive 7