wireless network audit

Because the clock rate of the wireless network audit cannot change to enforce a policy, the only way that a rate limit can be imposed on an interface is to use time-division multiplexing (TDM). With TDM, when a rate limit (or CIR) is imposed on an interface, the limited traffic is allocated a subsecond time slice during which it can be sent. This subsecond time slice is referred to as the interval (or Tc). For example, if an 8-kbps CIR is imposed on a 64-kbps link, traffic can be sent for an interval of 125 ms (64,000 bps / 8000 bits).

The entire amount of the CIR (8000 bits) could be sent at once, but then the algorithm would have to wait 875 ms before it could send any more data (to impose the rate limit). Such an interpacket delay likely would be viewed as excessive. Therefore, to smooth out the flow over each second, the CIR is divided into smaller units, referred to as the committed burst (Bc), which is the sustained number of bits that can be transmitted per interval. These smaller units are sent over multiple instances during a single second. Continuing with the previous example, if the Bc is set to 1000, each committed burst can take only 15.6 ms (1000 bits / 64,000 bps) to send traffic out the interface at the clock rate. The algorithm waits 109.4 ms (125 ms 15.6 ms) and sends another 15.6 ms of data. This wireless network audit is repeated a total of eight times during the second