Classification of Connectors Connectors can be divided into three categories based on how they are connected:
Wire-to-Wire (WTW) connector: Such as S-ATA data cable, flat cable, FDD/HDD/Ultra ATA 66/100, power cable, USB, 1394 data cable.
Wire-to-Board (WTB) connector: Such as I/O D Sub/USB/Mini Din/Mod.Jace/Audio jack/1394/P2*2; data, power connector: ATX/BTX/POWER.
Board-to-Board (BTB) connector: Such as memory: DDR; expansion slot: PCB/PCI Exp.
