| 摘要 |
PCT No. PCT/GB94/00267 Sec. 371 Date Sep. 15, 1995 Sec. 102(e) Date Sep. 15, 1995 PCT Filed Feb. 10, 1994 PCT Pub. No. WO94/18777 PCT Pub. Date Aug. 18, 1994A communications system for establishing radio transmission and reception between one or more base units and one or more portable units. Upon reception at a base unit of an incoming call a first callout signal is transmitted to one or more portable units by the base unit. This first call out signal does not contain any information about operating a ringing device located in each portable unit, however, when the sequence signal from the first portable unit to respond to the callout signal is received by the base unit, the base unit sends out a second callout signal. This second callout signal contains information which starts a ringing cadence off, at the beginning of the cadence, in the ringing device in the first portable unit to respond and thus there is always only a small delay between a base unit and a portable unit making contact and the portable unit beginning to ring. |
