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Patent Agency Ranking
公开(公告)号：DE2558979A1
公开(公告)日：1976-10-21
申请号：DE2558979
申请日：1975-12-29
Applicant: IBM
Inventor： FLEMMING DONALD CLYDE , MARKEY HAROLD G
IPC: H04J3/00 , H04B7/15 , H04B7/185 , H04B7/212 , H04B17/00 , H04M3/00 , H04Q11/00 , H04Q11/04 , H04J6/02 , H04B7/14
Abstract: Digital exchange terminals are linked by earth satellite and terrestrial point-to-point time division trunks in a privately coordinatable time division switching and communication network serving to connectively link multiple ports attachable to separate voice telephone and data communication "subscriber" trunk lines. The terminals operate relative to the satellite in a time division multiple access (TDMA) system with a portion of the system capacity (traffic burst channels) variably allocated to the terminals by demand assignment. The demand assignment is autonomously controlled by the terminals through supervisory communications carried over dedicated satellite channels (Order Wires) also utilized for synchronization. Internally the terminals employ modular multiplex switching between ports and "virtual" channels (buffer stores) and voice activity compression (mapping of groups of up to n virtual channels into groups of up to m, m less than n, actual time division channels on the time division trunks). The activity compression serves to make the terrestrial and satellite channel resources of the system virtually available to more lines than can actually be served in one TDMA frame. External management (data processing) apparatus attached to a terminal line port supplies information stored by the terminals and used by the terminals to restrict options in selecting connection path segments between respective ports and virtual channels. Thus, the network system may be adapted on various levels to balance its traffic loads (demand assignment "short term", network management/reconfiguration "longer term", and physical relocation of terminal modules/ports "longest term").
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公开(公告)号：DE2558932A1
公开(公告)日：1976-07-08
申请号：DE2558932
申请日：1975-12-29
Applicant: IBM
Inventor： FLEMMING DONALD CLYDE , MARKEY HAROLD G , WEST LYNN PARKER , METZ RALPH J
IPC: H04J3/00 , H04B7/15 , H04B7/185 , H04B7/212 , H04J3/24 , H04M3/00 , H04Q11/00 , H04Q11/04 , H04J6/02 , H04B7/14
Abstract: Modular digital exchanges linked by earth satellite provide coordinated time division switching and time compressed communication services relative to externally attached telephone and data (user) trunks. Branch exchange modules (NCU's) perform call switching, buffer storage, time compression and activity selective channel assignment handling between individual external user trunks and multi-bit channels of external time division highways (digital links). The latter are linked pyramidally to time division multiple access nodes of the satellite through Network (Nodal) Access Unit modules (NAU's) which perform further time compression handling and adaptive assignment of satellite channels based upon nodal distribution of demand. The NCU modules also provide "local" switching between user trunks and "tandem" linkage directly between NCU's (without NAU and satellite handling). The modules have individual common control processors which inter-communicate via reserved signaling channels on the digital links and satellite. The modularity is in increments suitable for adaptive deployment of connection equipment relative to satellite access nodes (e.g. to adapt to shifts in user populations and/or plant facilities).
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