Abstract: A network unit enclosure adapted for exposure to humidity and airborne contaminants defines a sealed first chamber and an adjacent second chamber. The two chambers are sealingly separated by a circuitry substrate on which electronic components are mounted in the first chamber and through which conductor connection means in the second chamber are connected to electronic components in the first chamber. An outer wall bordering the second chamber includes a hole for providing an electrical cable feedthrough. The enclosure may also define a third chamber, and a wall separating the first and third chamber including a sealed feedthrough for an optical fiber segment connected at one end to an opto-electronic component in the first chamber and the other end for connection to an optical fiber from an optical cable passed through an access hole in an outer wall bordering the third chamber.

Abstract: An audio-visual telecommunications system comprises a videophone terminal including a videophone communication interface for making a connection to a telecommunications network. A picture processing unit receives audio-visual signals from the videophone terminal which it process in order to compose a picture with sound. The picture processing unit transmits signals representing the composite picture to a television set. The picture processing unit includes an image memory which stores visual signals in a digital form as they are received from the videophone communication interface. A time base receives a composite video signal from the television set and extracts the line and frame synchronized signals. The time base controls a read-out which is synchronized with the extracted synchronization signals and formed responsive to the signals stored in the memory.

Abstract: A circuit for connecting multiple signal paths within a multi-mode communication device includes a double balanced mixer circuit selectively functioning as a modulation switch during an unbalanced state. As applied to a transmit section of a CDMA/FM cellular telephone, a dual-function double balanced mixer circuit connects a CDMA IF signal path with an FM audio signal path. The double balanced mixer circuit includes a double balanced mixer connected through oscillator input to an external LC (inductor-capacitor) tank connected to both a PLL (phase lock loop) and an FM audio signal. One signal input of the double balanced mixer receives a CDMA low IF signal, while the other double balanced mixer signal input is connected to a microprocessor-controlled switch for selectively unbalancing the balanced mixer while in the FM mode of operation.

Abstract: A method of operating a subscriber terminal to provide a flexible tapeless personalized auto-attendant telephone by means of measuring ring cadence of an incoming telephone call; and selecting one outgoing message in response to the ring cadence and playing it after a predetermined number of rings. The method also provides for the selection of group greetings and mailboxes automatically, for example, based on CLID and name match in a directory.

Abstract: A method for encoding a binary input sequence x(0,1) to obtain a duobinary output sequence y(+1,0,-1) is provided. The duobinary coding technique always provides an output bit y.sub.k =0 when the corresponding bit x.sub.k =0; bits y.sub.k alternatively assume a logical level "+1" and "-1" whenever an input bit x.sub.k-1 =0 changes to x.sub.k =1, and the output bit y.sub.k maintains the logical level "+1" or "-1" whenever the corresponding bit x.sub.k maintains the logical level "1". A coding device for encoding a binary input sequence x(0,1) to a duobinary output sequence y(+1,0,-1) is also provided, comprising a D-type flip-flop for generating a binary switch signal. A first AND circuit receives the input sequence and the switch signal, and provides a first binary sequence a(0,1), while a second AND circuit receives the input sequence and the complement of the switch signal and provides a second binary sequence b(0,1).

Abstract: In methods and apparatus for generating an LPC-encoded noise signal from an LPC-encoded speech signal, excitation parameters of the LPC-encoded speech signal for a current frame are randomized upon detection of speech in the current frame. For frames in which no speech is detected, LPC coefficients and frame energy for the current frame may be replaced with respective averages calculated over the current frame and a plurality of preceding frames. For frames in which speech is detected, LPC coefficients for the current frame may be replaced with respective averages of LPC coefficients used to replace LPC coefficients of an immediately previous frame. The comfort noise generation technique is particularly suitable for use in echo suppressors for digital cellular radio systems.

Abstract: A multiplier capable of removing nonlinear current using current mirror circuits. The multiplier uses MOSFET and BJT devices by the BiCOMS processes. The multiplier includes three current mirror circuits. A first current mirror includes a BJT Q.sub.3 and a BJT Q.sub.5 and also the BJT Q.sub.3 is coupled in series to the n-channel MOSFET M1 between the voltage V.sub.1 and a ground voltage level. A second current mirror includes a BJT Q.sub.7 and a BJT Q.sub.8. A third current mirror includes a BJT Q.sub.4 and a BJT Q.sub.6. Consequently, input voltage signals V.sub.1 and V.sub.dc applied to the n-channel MOSFETs M1 determine the current I.sub.1 and input voltage signals V.sub.1 and V.sub.2 applied to the n-channel MOSFET M2 determine the current I.sub.2.

Abstract: A method, for use in a mobile communications system (MCS), efficiently generates routing information when a caller of a first electronic switching system (ESS) calls a receiver's phone connected to a second ESS through a base station system, wherein the routing information is used for the first ESS to choose one of a plurality of transit networks (TN's) formed between the ESS's to communicate voice messages and/or data between the caller and the receiver. At a first step, if there is a first demand signal from the first ESS, roaming information representing the location of the receiver is derived, wherein the first demand signal is generated when an identification code, indicating that the receiver is a mobile subscriber, is received by the first ESS from the caller.

Abstract: A portable wireless telephone structure in which a foldable wallet carries a telephone in addition to having a pocket to house paper currency. The telephone is exposed for use with the wallet in open condition and is housed with the wallet in closed condition. The telephone has a communication mode to a user monetary function to permit telephonic transfer of monetary units. Thus, the telephone may eliminate need for carrying credit or bank cards in the wallet except for the telephone use with a "smart" card for telephonic transfer of monetary amounts to the "smart" card for transaction purposes.

Abstract: A cable tag allows information about the identity of a communications or power cable and its route to be secured to the cable. The cable tag is secured to a cable in such a way that it can be readily removed and re-secured if necessary. For installation, a portion of a liner adhered to a face stock of the cable tag is removed to expose adhesive. Folding the tag around the cable causes the areas of exposed adhesive to come into contact with each other and with the cable. The remaining portion of the liner on the back of the face stock provides a non-adherent surface where a user's fingers can easily separate the cable tag from the cable. The cable tag includes removable sub-labels to permanently fix originating and terminating information to the cable after installation. The remaining part of the cable tag may then be removed and discarded if necessary.

Abstract: A bi-directional communications network is disclosed, and in particular a TDM/TDMA protocol for the shared coax medium downstream/upstream resource. This protocol provides a very efficient technique for resource sharing in the access network of HFC systems. A method of communicating information between a central station and a plurality of terminals in a distribution network, is also disclosed. This invention allows the ranging of the terminals of unknown distance from the central station within an upstream ATM cell slot dynamically allocated for the marshalling process by the central station.

Abstract: An optical circuit device having a core supported on a substrate incorporates a wave guide being in a layer of the core. The structure is provided with a cladding layer by depositing by means of a PECVD process a cladding material on the wave guide core and maintaining a negative bias between the substrate or the core and earth while the deposition is proceeding.

Abstract: Various operational measurements of a network element are determined in real time. These measurements are used to determine the call carrying capacity of the elements and the reaction of the network element to various call loads. Models of the network elements are generated from the operational measurements. Using an element's model, the network's reaction to various changes in a particular element can be determined without complex and expensive engineering work.

Abstract: The method and system of the present invention can be utilized to model aggregate multimedia traffic within a shared transmission medium, such as an ATM network, so that customer expectations can be met and the network can be constructed and utilized efficiently. A total number of different traffic services, as well as a maximum number of sources of each service are specified by a network operator. Next, a quality of service characterization for each service is determined, based upon available standards. Average sojourn time for each service is determined by modeling each Constant Bit Rate (CBR) service as a Renewal Process, each Variable Bit Rate (VBR) real-time service as a multistate Modulated Discrete Process and each Variable Bit Rate (VBR) non-real-time service as an On-Off Process. Sojourn mean times can thereafter be obtained from measurements or published standards.

Abstract: The invention relates to apparatus and method for efficiently removing humidity from a chamber. A thermoelectric cooler with a maintained temperature differential between the cool and warm sides of the cooler is used to condense the humidity from within the chamber upon the cool side of the cooler. The condensate is transferred to the warm side of the cooler and then removed through the capillary penetration into a porous structure of an evaporator at the warm side of the cooler and further evaporation. During evaporation, the condensate extracts heat from the warm side of the cooler, the temperature of the cool side of the cooler being also decreased, which results in an increase of the overall efficiency of the apparatus.

Abstract: A method and system are provided for calculating the total service capacity for multimedia traffic under aggregate traffic conditions within a shared transmission medium, such as an ATM network. A total number of different types of telecommunication traffic is specified by the network operator or network designer. Each different type of network telecommunication traffic is referred to as a service. Next, each week is partitioned into several busy periods. This partitioning is provided by the network operator and may include multiple days, for example: Monday-Friday; and, Saturday-Sunday. Thereafter, for each busy day described above, the day is further partitioned into several busy periods, each period discernible from a previous period by the level of activity expected within the network at that time. For example, 8:00 a.m.-5:00 p.m.; and, 5:00 p.m.-7:00 a.m. Once again, this information is provided by the network operator or network designer.

Abstract: A ferroelectric dielectric for microwave applications is provided including a polycrystalline perovskite phase of lead zirconate titanate dielectric material. Small grain size material is provided by a low temperature process, by a rapid thermal annealing process. A layer of amorphous ferroelectric precursor material is deposited and annealed in an oxygen containing atmosphere in the presence of water vapour, preferably with the addition of a few percent of ozone, and at a temperature of less than 500.degree. C. Advantageously, the method provides for formation of a ferroelectric material including lead zirconate titanate with a grain size less than 20 nm, with low film stress, high dielectric constant and low leakage current, which has excellent ferroelectric characteristics up to 10 GHz. This material has applications for capacitors, as filters, decoupling, coupling, and bypass elements and also for high frequency surface acoustic wave devices.

Abstract: Stable conductive polymer compositions which do not contain metal ions.The compositions comprise at least one inherently conductive polymer or copolymer chosen from polythiophenes, polypyrroles, polyacetylenes, polyphenylenes, polythiophene copolymers, polypyrrole copolymers and their water-soluble derivatives, characterized in that the inherently conductive polymer is doped with an oxidizing compound chosen from the compounds of formulae:R--NO and R--NO.sub.2,in which R is chosen from the groups HSO.sub.4, R.sup.1 SO.sub.3 and (R.sup.1 SO.sub.2).sub.2 N,in which R.sub.1 ?sic! is chosen from linear or branched alkyl radicals having 1 to 10 atoms, preferably 1 to 4 carbon atoms, and linear or branched fluoroalkyl radicals having 1 to 10 carbon atoms, preferably 1 to 4 carbon atoms. Application in microelectronics.

Abstract: A tool for use in manipulating telecommunications modules comprises a housing having a grip, engagement means for engaging with a module so as to securely grasp the module and a transmitter/receiver unit for transmitting signals to and receiving information from the module. Information received from the module is displayed on the tool. The tool also has a control for allowing a user to request decommissioning of the module to which it is engaged, the tool being arranged to receive a reply from a module indicating that decommissioning is complete. Preferably an interlock mechanism couples an unlocking control on the tool to a key, the interlock inhibiting key until receiving the reply from the module indicating that decommissioning is complete. The tool can also be used to configure a module.