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The cell loss ratio the ratio of lost cells to the sum of the total number of lost and successfully delivered cells Cell insertion rate the number of cells inserted into an ATM network within a specific period of time Severely errored cell ratio the ratio of severely errored cells (more than one-bit of an error in the header) to the number of successfully delivered cells Cell transfer capacity: the maximum number of successfully delivered cells over a specified ATM connection during a period of time (one second) Cell transfer delay: the average delay and the arithmetic delay of a specified number of cell delays The cell delay variation (CDV) is the difference between a specific cell delay and the average This variation causes the most problems, especially with real-time voice and video Priority control: networks must adequately service buffers in the network nodes under all kinds of conditions When congestion occurs (too many cells in the network), a priority mechanism can be used in the following ways: o To remedy the situation Some cells can be discarded under congestion circumstances o For congestion control Networks must prevent congested conditions from spreading throughout the network In this case, no sender should be allowed to overwhelm any receiver, as the network will accommodate by discarding cells o As a Generic Cell Rate Algorithm (GCRA) The GCRA is an example of a generic term It refers to a virtual scheduling algorithm or a continuously leaky bucket and expresses a complex series of formulas In most network implementations, it is widely known that the double leaky bucket algorithm is what we call the GCRA Using the leaky bucket as a means of describing the GCRA is a good way to figure out exactly of what is happening The GCRA functions like a bucket with a hole in the bottom The bucket leaks at a steady rate, no matter when water is poured into the bucket The bucket may be initially empty, partially full, or full to the brim As water pours in, it may splash or completely overflow the bucket if poured in from a much larger container Water emerges from the hole in the bucket at precisely the same rate at all times (Of course, everyone knows there are no real buckets in computers and networks, although the term bit-bucket is constantly used) o As a counter or buffer The simplest leaky bucket implementation is a counter The counter has a minimum value (usually 0) and a maximum value With the empty bucket, it holds up to 100 cells All of a sudden, 150 cells are delivered to the network This means that the bucket will overflow or the 50 cells will be discarded because the buffer can only hold 100 At the bottom, the cells enter the network at a ratio of 1 over the sustained cell rate (SCR) Cells will exit at a steady rate.

The Devantech SRF04 Ultrasonic Range Finder (shown in Figure 11-1) is a 40-kHz ultrasonic range finder that can be used to determine the range of objects from 12 inches to about 10 feet (or 3 cm to 3 meters)

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11-1

A network is a series of interconnections that form a cohesive and ubiquitous connectivity arrangement when all tied together That sounds rather vague, so let s look at the components of what constitutes the telecommunications network The telecommunications network referred to here is the one that was built around voice communications but has been undergoing a metamorphosis for the past two decades The convergence of voice and data is nothing new; we have been trying to run data over a voice network since the 1970s However, to run data over the voice network, we had to make the data look like voice This caused significant problems for the data because the voice network was noisy and error-prone Reliability was a dream and integrity was unattainable, no matter what the price Generally speaking, a network is a series of interconnection points The telephone companies over the years have been developing the connections throughout the world so that a level of cost-effective services can be achieved and their return on investment (ROI) can be met As a matter of due course, whenever a customer wants a particular form of service, the traditional carriers offer two answers: 1 It cannot be done technically 2 The tariff will not allow us to do that! Regardless what the question happened to be, the telephone carriers were constantly the delay and the limiting factor in meeting the needs and demands for data and voice communications In order to facilitate our interconnections, the telephone companies installed wires to the customer s door The wiring was selected as the most economical to satisfy the need and the ROI equation Consequently, the telephone companies installed the least expensive wiring possible Because they were primarily satisfying the demand for voice communications, they installed a thin wire (26-gauge) to most customers whose locations were within a mile or two from the central office At the demarcation point, they installed the least expensive termination device (RJ-11), satisfying the standard two-wire unshielded twisted pair communications infrastructure The position of the demarcation point depended on the legal issues involved In the early days of the telephone network, the telephone companies owned everything, so they ran the wires to an interface point and then connected their telephone equipment to the wires at the customer s end The point here is that the telephone sets were essentially commodity-priced items requiring little special effect or treatment When the data communications industry began during the late 1950s, the telephone companies began to charge an inordinate amount of money to accommodate this different service Functionally, they were in the voice business and not the data business As a matter of fact, to this day, most telephone companies do not know how to spell the word data ! They profess that they understand this technology, but when faced with tough.

Devantech SRF04 Ultrasonic Range Finder (courtesy of Acroname, Inc)