txAckThreshold    169 drivers/usb/serial/keyspan_usa26msg.h 		txAckThreshold,	// BOTH: 0=not allowed, 1=normal, 2-255 deliver ACK faster
txAckThreshold    170 drivers/usb/serial/keyspan_usa49msg.h 		txAckThreshold,	// 0=not allowed, 1=normal, 2-255 deliver ACK faster
txAckThreshold    165 drivers/usb/serial/keyspan_usa67msg.h 		txAckThreshold,	// 0=not allowed, 1=normal, 2-255 deliver ACK faster