发明名称 |
COMMUNICATIONS SYSTEMS |
摘要 |
Communications Systems The telecommunications system comprises a plurality of distributed base stations each operatively coupled to a public switched telecommunications network and being adapted to cooperate with one or more of a plurality of portable cordless telephone units by way of a plurality of cordless digital communication channels operating on a time division duplex basis. The base unit is arranged upon detection of an incoming public switched network call, to poll all; the portable cordless telephone units by transmitting on a repetitious basis the identity of the portable units to be connected to the incoming call on a selected channel and the base unit is arranged to intersperse each poll operation with a signalling message. Each portable unit is arranged to scan the cordless channels at a predetermined interval and the base unit is adapted to postpone the sending of a ringing message to any of the portable units until a predetermined period has elapsed since the commencement of the polling action, the predetermined period being substantially similar to but larger than the predetermined interval.
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申请公布号 |
CA2012368(A1) |
申请公布日期 |
1990.09.30 |
申请号 |
CA19902012368 |
申请日期 |
1990.03.16 |
申请人 |
BARNES, NIGEL E.;KNIGHT, PHILIP J. |
发明人 |
BARNES, NIGEL E.;KNIGHT, PHILIP J. |
分类号 |
H04M1/00;H04B7/26;H04L12/56;H04M1/733;H04W74/06;H04W76/02;H04W88/08;(IPC1-7):H04J3/00 |
主分类号 |
H04M1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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