Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1997-04-07
1998-06-02
Gregory, Bernarr E.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 30, 380 49, H04L 908, H04L 900, H04L 930
Patent
active
057613079
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Relatively recent developments in telecommunications technology are giving rise, at the level of subscriber lines, to passive optical telecommunications systems in which in each case a plurality of decentralized devices (subscriber stations or so-called distant units combining in each case a plurality of subscriber stations) is connected in each case via a separate optical waveguide subscriber line to an optical splitter which is connected directly or via at least one further optical splitter to a common optical waveguide connection of a central device--realized in particular by means of a switching center--via an optical waveguide bus (EP-A-0 171 080; ISSLS '88, Conf. Papers 9.4.1 . . . 5; BR Telecom Technol. J. 17(1989)2, 100 . . . 113).
In such a passive optical telecommunications network, the transmission of signals from the central device "downstream" to the decentralized devices can proceed in a TDM cell stream from which each decentralized device only receives the cells intended for this particular decentralized device, and the transmission of signals from the decentralized devices "upstream" to the central device can proceed using a TDMA method, according to which a decentralized device emits each burst synchronized with the aid of a delay device which is set in a device-specific way from the central device (EP-A-0 460 398). The downstream transmission of signals from the central device to the decentralized devices and the upstream transmission of signals from the decentralized devices to the central device can also proceed in this context in one and the same wavelength window (for example using equal band mode at 1.3 .mu.m).
The introduction of new broadband communication services depends quite generally on the type and scope of the already existing telecommunications infrastructures with the telecommunications services made available in them and on the demand for broadband telecommunications possibilities. In this context, potentially the greatest connection volume is considered to be in private households; however, this connection potential cannot be translated into effective demand for connections without the cost of a broadband subscriber connection being appropriately low.
Various connection possibilities are currently being discussed in order to permit a subscriber to use broadband ISDN services (examples of this are interactive video on demand (VoD), teleshopping, information searching, and also narrowband services such as (N-)ISDN or conventional telephone services (POTS)). Solutions in which already existing infrastructure can be used are particularly attractive. For example the coaxial cable networks of CATV providers constitute an appropriate medium: the frequency range of for example 50-450 MHz (in Germany) is used by conventional analog signal television channels; the range below and above the analog signal television distribution has hitherto been free and can be used for new services. In the USA part of the range which has been free hitherto is used for so-called cablephone by a number of cable TV companies. Other operators are considering a more comprehensive system which provides a large part of the abovementioned services within the scope of an access network, for example on an ATM basis, it being usually possible, because of the limited range, to connect a fiber optic feeder upstream of the coaxial subnetworks (TELEPHONY, 01.11.93, 48 . . . 53). In addition to a passive optical network (PON) with expansion by means of a coaxial line tree network for unidirectional distributive communication (TV), a further passive optical network (PON) has already been used for bidirectional Telecommunications Engineer! 46(1992)10, FIG. 11.2 System OPAL 4). In a particularly advantageous configuration of a subscriber network, the coaxial line tree networks are connected, in each case by a converter device, to an optical waveguide tree network, containing optical splitters, for both bidirectional telecommunications services, preferably in transposed band mode, and uni
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Mohrmann Karl Heinz
Stein Karl-Ulrich
Gregory Bernarr E.
Siemens Aktiengesellschaft
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