ll the program streams cannot exceed the bandwidth available on the interface points of the sending and receiving systems and the network connecting the systems. In other words, the bandwidth of the sending and receiving systems must equal or, preferably, exceed the aggregate of all traffic. GOS means the network connecting all workstations and servers must be available to all users within the design limits agreed to or promised to its users. For example, telephone network services use statistical probability based metrics to define and measure GOS level, inside and outside the network. A P.01 GOS means the network is 3 CONTENT TRANSPORT NETWORK DEFINED designed and performs, or doesn't perform, within the limits of probability that the network will enable the user to complete the call in 99 of 100 attempts. This model can be applied to workstations, servers, and a LAN, MAN, WAN or combination of all and will perform satisfactorily 99 of 100 times when someone wants to trans- fer a file, or set up and use a connection to deliver streaming content originating on a server platform and terminating in one or more peer platforms at other locations or interfaces served by the network. QOS means that the quality of the connection in terms of bandwidth, bit-error rate (BER), jitter, packet loss or any other parameter the payload may be sensitive to, is of sufficient level to support program content transport between and amongst the service points. The basic model for this category of network is classic TDM facilities found in ANSI/ITU standards-based networks. The acid test of performance is measurement and comparison to TDM private line facilities such as E1/T1,E3/DS3, and OC3/STM1. A good question of network equip- ment, facilities, and service suppliers is: Can you emulate T1, or DS3, etc.? The right answer is not "Yes." The right answer is, "You can expect jitter, packet loss and bit error rate performance of X, y, and Z. This compares to TDM emulation performance of X, y, and z." Then you can decide if the differenc