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3.1.3 Initialization

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All sequence numbers MUST start at 1. All serial numbers MUST start at 0.

The count of bytes received SHOULD correspond as closely as possible to the total bytes received from the sender on the receiver's link, and SHOULD include the duplicate (retransmitted) packets.

The tick count is a 32-bit value counting 1/1000ths of a second of elapsed time. It can start at any value but MUST increase at the specified rate.

NACKs are not triggered, but only occur when missing frames are detected.

Note However, an implementation can attempt to trigger NACKs using a timer-based algorithm approach.

ACKs are triggered by either the SAK bit in the message header or by the end of the message.

ACKs MAY wait for a timer before sending, unless the SAK bit has been specified by the sender.