There are two basic forms of data packet, DATA0 and DATA1. A data packet must always be preceded by an address token, and is usually followed by a handshake token from the receiver back to the transmitter. The two packet types provide the 1-bit sequence number required by Stop-and-wait ARQ. If a USB host does not receive a response (such as an ACK) for data it has transmitted, it does not know if the data was received or not; the data might have been lost in transit, or it might have been received but the handshake response was lost.
There are two basic forms of data packet , DATA0 and DATA1 . A data packet must always be preceded by an address token , and is usually followed by a handshake token from the receiver back to the transmitter . The two packet types provide the 1-bit sequence number required by Stop - and - wait ARQ . If a USB host does not receive a response ( such as an ACK ) for data it has transmitted , it does not know if the data was received or not ; the data might have been lost in transit , or it might have been received but the handshake response was lost .
A data packet must always be preceded by what?
A data packet must always be preceded by what ?
an address token
an address token