Ostrolenk, Faber, Gerb & Soffen, LLP
Method of generating a ringing signal in a satellite communications system
 A ringing signal is generated at one of a plurality of terminal stations in a SCPC-DAMA (single channel per carrier demand assigned multiple access) satellite communications system. The satellite communications system further includes a central station. Firstly, the central station determines a pair of speech channels in response to a call request from a calling terminal station via a control channel. Further, the central terminal determines a ringing signal pattern number by using a country code which has been sent via the control channel together with said call request. Following this, the central station applies the data indicting the pair of available speech channels to both of the calling terminal station and a called terminal station by way of another control channel. The called terminal station determines a ringing signal pattern using said ringing signal pattern number applied from the central terminal. The called terminal station generates a ringing signal which is used for alerting a destination subscriber terminal which is operatively coupled to the called terminal station. 
NEC Corporation
H
H04B
inventional
Hiroshi
Yamashita