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Table 4: T568B CAT 5 PINOUT
Table 5: 1/8” (3.5 mm) Audio/Serial Connection (model dependent)
Pin Signal
Tip Serial Tx (DB9 pin3) Left Audio+
Ring Serial Rx (DB9 pin2) Right Audio+
Sleeve Serial GND (DB9 pin5) GND
Note: The stereo audio input at the transmitter is summed and output as mono
audio on both channels at the receiver.