Pulse or digital communications – Transceivers – Modems
Patent
1997-01-27
1999-05-11
Ghebretinsae, Temesghen
Pulse or digital communications
Transceivers
Modems
455427, H04B1/38
Patent
active
059036036
ABSTRACT:
A secure communications system (501) including a local digital terminal (510) coupled to an interworking function (538). The interworking function (538) couples the digital radio network (121) to a PSTN (542, 546, 548) and a remote analog communication terminal (552). The system (501) includes a novel method of establishing an end-to-end communication channel between local digital (510) and remote analog (552) terminals wherein the local digital terminal establishes (510) a direct digital channel (121) between itself (510) and the interworking function (538) and transmits a message describing its signaling capabilities to the interworking function (538). The interworking function (538) then trains its modem with the modem of the remote analog terminal (552) such that signaling capabilities of the local digital terminal (510) and the remote analog terminal (552) are not violated. By moving modem training procedures to the interworking function (538), signal processing delays in the local digital terminal (510) do not adversely affect the success of establishing the end-to-end communication channel.
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Hall Timothy Gerard
Kennedy Paul Roy
Yip William Chun-Hung
Ghebretinsae Temesghen
Gorrie Gregory J.
Motorola Inc.
Park Albert C.
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