The term "demand assignment" (abbreviated as DA) should be taken as meaning that the assignment is on a per-call basis. Note-Satellite circuits with demand assigned multiple access are those circuits which may be set up by assignment of a satellite link to operate between specified earth stations when the actual demand arises.
ITU-T Q.48 FRENCH-1988 Referenced Document
ITU-T Q.151 Signal Code for Register Signalling - Specifications of Signalling Systems Nos. 4 and 5 (Study Group XI) 2 pp*， 1989-01-01 Update
ITU-T Q.252 1.2 Signal Transfer Time Definitions - Specifications of Signalling System No. 6 (Study Group XI) 2 pp
ITU-T Q.276 6.6 Service Dependability - Specifications of Signalling System No. 6 (Study Group XI) 2 pp
ITU-T Q.287 7.3 Signal Transfer Time Requirements - Specifications of Signalling System No. 6 (Study Group XI) 3 pp