HYPOTHETICAL REFERENCE DIGITAL PATH FOR RADIO-RELAY SYSTEMS WHICH MAY FORM PART OF AN INTEGRATED SERVICES DIGITAL NETWORK WITH A CAPACITY ABOVE THE SECOND HIERARCHICAL LEVEL
The CCIR, CONSIDERING that it is desirable to define a hypothetical reference digital path for digital radio-relay systems, to afford guidance to the designers of equipment and systems for use in international telecommunication networks; that the hypothetical reference digital path for digital radio-relay systems should, as far as possible, be in agreement with the 2500 km hypothetical reference digital paths as specified by the CCITT; that the capacity of digital radio-relay systems should be that of a CCITT recommended hierarchical level or an integral multiple of it.