Labels:text | post-it note | screenshot | rectangle | handwriting | colorfulness OCR: 4T+ TRANSMITTER Collision Indicator Carrier Filter UITP Sense Pair 2 fransmit Waveshoping Filter UTP Pair 1 MAC or 8B/67 Data Encoder Splitter Transmit Waveshaping Filter UTP Pair 3 Transmit Waveshoping Filter UTP Pair 4 FIGURE 4: 100BaseT's solution for transmitting over four-pair Category 3 is 4T + . In this half-duplex signaling scheme, three pairs are used to transmit data in each direction, while the fourth pair is used as receive only for collision detection.