INTRODUCTION AND SCOPEThis standard applies to microwave relay communication systems. Usually these systems are multi-hop. They transmit intelligence initially derived from speech@ telegraph@ data@ facsimile@ etc.@ all multiplexed on the radio baseband. Relay systems exclusively for broadcast material are excluded@ and are covered by EIA Standard RS-250-A.The standard includes only the system from the baseband input terminals to the baseband output terminals and does not include the multiplex equipment@ which is dealt with in a separate standard. It does@ however@ include the transmission medium.While it may not be possible to specify actual minimum performance numbers@ it wil?? serve as a standard of terminology and a guide toward detailed specifications@ Definitions of pertinent systems parameters are given and methods of measurement are included. Thus@ the emphasis has been toward establishing a common language and defining certain reference points in the system. Terminology already established by standards and regulatory organizations has been used wherever applicable. NOTE: This standard deals primarily with analog microwave systems using angle modulation. It should be noted that a number of definitions may not be applicable to systems using digital modulation techniques such as PCM.