This part of IEC 60728 defines the characteristics of equipment used in the headends of terrestrial 403 broadcast and satellite receiving systems (without satellite outdoor units and without those broadband 404 amplifiers in the headend as described in IEC 60728-3). The satellite outdoor units for FSS are 405 described in ETSI ETS 300 158, for BSS in ETSI ETS 300 249. Test methods for both types (FSS and 406 BSS) of satellite outdoor units are laid down in ETSI ETS 300 457. 407 This standard 408 " covers the frequency range 5 MHz to 3 000 MHz; 409 " identifies performance requirements for certain parameters; 410 " lays down data publication requirements for certain parameters; 411 " stipulates methods of measurements; 412 " introduces minimum requirements defining quality grades (Q-grades). 413 This standard defines the overall characteristics for upstream/downstream signals between external 414 sources/sinks (for example, antennas, cable modem termination systems, etc.) and the system interface 415 to the cable network. In the case of modular headend systems, also single equipment as modulators, 416 converters, etc. are described. Cable modem termination systems, encrypters, decrypters, etc. are not 417 described in this standard. If such equipment is used in headends, the relevant parameters for RF, 418 video, audio and data interfaces should be met. 419 According to the definitions in 3.1, the headends are divided into the following three quality grades: 420 " Grade 1: central headend; 421 " Grade 2: hub headend or hubsite; 422 " Grade 3: MATV headend/individual reception headend.