A schedule of equipment and services to be supplied is another 7 SPECIFYING EQUIPMENT AND SERVICES example of an important document that must dovetail closely with the specifications document. In journalistic terms, the specification defines what, and the schedule defines how many of each. As the name implies, the purpose of the specification document is to be specific about equipment or service functions, capabilities, and per- formance. Well-written specification documents contain an introduc- tion, a description of how the equipment or service will be used, and how it must perform within the specified limits to be acceptable. It is very important to be specific and realistic. Realistic, from the per- spective of business need, means what the business can tolerate across a range of performance, and realistic about what can be poten- tially delivered. Making the performance tolerance too tight, or diffi- cult to achieve causes cost and delivery time to increase. Making it too loose lowers cost and time to deliver, but it might create perform- ance results that don't satisfy business need and risks quality and customer acceptance on the output side of the business. EXAMPLE EQUIPMENT AND SERVICE SPECIFICATIONS The remainder of this chapter contains examples of specifications that can be used to detail technical requirements for a digital trans- mission facility for a multiple station group. The examples cover a studio-to-transmitter (STL) network, digital television transmitter, design, erection, and installation services. These should be read and used within the context of the overall block diagram referenced at the beginning of Chapter 3. The material is intended to serve as the technical content of an RFI or RFP and acceptance of deliverables covered in Chapters 8 and 10. STL Network The STL network will provide and all transmission facilities required to transport content, monitor and control transmitters, and support voice and data communications, site security, and network manage- ment functions. The network