... address¹

reservation() itself uses a special IP address, which is mapped to the special Ethernet address through an artificial and persistent ARP cache entry.

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... time²

This is a system initialization parameter and can be, for instance, set to 33 msec for applications requiring 30 video frames per second.

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... zero³

In practice, the token is passed back to the first RT node when a non-real-time node determines that the residual cycle time in the counter is less than that needed to send out the packet at the head of its message queue. Therefore, the token cycle counter need not be zero when a new token cycle is started.

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... system⁴

Most UNIX systems' timer resolution is 10 msec.

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