blic network at their option. If such is included, the service pro- vider must demonstrate adequate and satisfactory firewall capabil- ities between the network interface point and the outside world. 7 SPECIFYING EQUIPMENT AND SERVICES The service between the central master control and each transmitter site will consist of a minimum of four 20 Mbs channels, net of any overhead, but not including any forward error correction. Forward error correction will be discussed in detail during proposal reviews and a determination made as to its necessity and value. Premises Architecture and Network Interface Architecture of the premises equipment includes capabilities to sup- port program content transport, voice, data communications, Internet access, and similar applications such as video conferencing and visual site monitoring. Interface on the network side at SONET/SDH level STS1 or STS4 is preferred. All plesiochronous (PDH) service interfaces will be on the service side of the network interface equipment. Service Interfaces include SMPTE 259, SMPTE 292, SMPTE 305, DVB- ASI, T1, DS3, and IEEE 10/100/1000BT in accordance with applicable standards. Suppliers are requested to provide a detailed list of ap- plicable standards of official standards bodies such as SMPTE, IETF, ANSI, ITU, or other and relevance and applicability of each reference within the context of each standard's use in their products and services. Figure 7-2 shows a functional block diagram of the general requirements. Potential suppliers are requested to include one or more block diagrams showing the next level of detail along with a matching spreadsheet for each item of equipment proposed. The spreadsheet must include quantity, description unit price, and total price and discount applicable to each item based on total pack- age price. Separate sheets in the file covering equipment, installation, and maintenance cost during the first and second through the fifth year of operational life are requested. The service provider may offer network interface dev