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| Symbol reader using differentiating circuit for light beam focusing |
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| Radio-diagnostic equipment with shutter |
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Telecommunications service delivery
| Details |
Inventors: Titmuss, Richard John; Winter, Christopher Simon;
Assignee: British Telecommunications public limited company (London, GB)
Primary Examiner: Urban; Edward F.
Assistant Examiner: Zewdu; Meless
Attorney, Agent or Firm: Nixon & Vanderhye P.C.
Routing apparatus for a telecommunication system includes a telecommunications user apparatus arranged to generate a request for a telecommunications delivery service, to receive a plurality of telecommunications delivery service offers and to select one of them. The system also intends a plurality of telecommunication service supply apparatuses each arranged to receive one of the request to generate an offer signal specifying a proposed delivery service and to receive an acceptance signal indicating acceptance thereof and, on receipt thereof, to generate a service provision invitation. The system further provides a plurality of resource supplier apparatuses each representing a communications resource arranged to communicate with each of said service supply apparatuses. The resource supplier apparatus is arranged to receive an invitation to determine whether the telecommunications resource they represent would contribute to the provision of the corresponding service; and, if so, to signal this to the service supply apparatus. The service supply apparatus is arranged, on the basis of signals from the resource supplier apparatus to select the route subsequent to the offer of the service. |
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DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS General Overview of Physical Layer Referring to FIG.
1, at the physical or bearer level the telecommunications environment of a user U1 comprises a cellular telephone T1 and a personal digital assistant T2 carried by the user; a facsimile apparatus T3 and conventional telephone T4 at a desk a few feet from the user; and a computer workstation T5 including a modem at a desk top some meters away from the user, all within a single building.
The workstation T5 in this case comprises a local area network (LAN) server, connected to further terminals T6-T9 (not shown) at different distances from the user.
The various terminals T1-T9 are each capable of receiving different signal formats, as follows: T1--voice or low bit rate data.
T2--low bit rate data (receive only).
T3--facsimile image signals.
T4--narrow bandwidth audio.
T5--high bit rate data in various formats.
In communication with the various terminals are a number of different communications channels forming parts of different notional networks (although some or all may be commonly owned).
A public switched telephone network (PSTN) N1 is connected via a local line L3 to terminal T3, and via local line L4 to terminal T4.
An integrated services digital network (ISDN) N2 is interconnected with the PSTN N1 via a gateway G1 (e.
g.
a local or international switching centre), and is connected via an ISDN line L5 to terminal T5, and hence to local area network N3.
A public land mobile network (PLMN) (e.
g.
a GSM--compatible digital cellular network) N4 is connected via a gateway G2 to the PSTN N1 and ISDN N2.
A base station B1 of the PLMN provides a picocell in the environment of the building within which the user U1 is located, and a base station B2 provides a cell within the same general area.
Thus, the networks N1-N4 are capable of delivering data at different rates to the various terminal T1-T9; low speed data via the PLMN N4, higher speed data via the PSTN N1, and yet higher speed data via the ISDN N2 or LAN N3
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Cell Phones 
