Matches 201 - 250 out of 309 < 1 2 3 4 5 6 7 >
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5124976 Synchronous digital transmitter  
A synchronous digital transmitter connects a data terminal equipment to a multiservice digital PABX which accesses the public switched telephone network at 64 kbit/s. It includes a system for...
5091907 Multiplexer and demultiplexer, particularly for information transmission networks with a synchronous hierarchy of the digital signals  
Information transmission networks with a synchronous hierarchy of digital signals, require that digital signals of the plesiochronous hierarchy are to be inserted into multiplex elements with...
5068813 Phased digital filtering in multichannel environment  
Parallel multistage, multirate digital filters are executed by a digital signal processor for signals on a plurality of channels. Parallel signals are converted from a first sampling frequency to a...
5062105 Programmable multiplexing techniques for mapping a capacity domain into a time domain within a frame  
Method and apparatus are disclosed for a programmable multiplexer for converting each of one or more input data signals, with individual data rates, into a second higher data rate signal by mapping...
5051993 Mixed modulation level communication system  
A communication system has an information signal having a plurality of data streams. The data streams are simultaneously modulated on a multi-level symbol transmission. The data streams may have...
5029160 Line concentration system  
A line concentration system containing: a plurality of data input/output circuits; a plurality of first-side transmission lines to each of which one of a plurality of data input/output circuits can...
5005171 Telecommunication transmission format suited for network-independent timing environments  
In a subrate-multiplexed communication system, a user channel whose data transmission rate fluctuates about a nominal rate from the viewpoint of a network--illustratively because the channel is...
4987572 Apparatus and associated methods for converting asynchronous nonhomogeneous variable width parallel data to a format suitable for transmission over synchronous high speed serial transmission media  
Apparatus and associated methods are disclosed for converting asynchronous nonhomogeneous variable width parallel data pattern signals to serial data pattern signals representative of said input...
4985891 ISDN system having subscriber line multiplexer with means for establishing different data links through D-channels on subscriber line and high rate transmission line  
In an ISDN system comprising a plurality of DSLs each having a plurality of DTEs and an ISDN switch having a TEI list, a multiplexer is used for enabling each DTE to access the ISDN switch through...
4979166 Multiplexing apparatus  
A multiplexing apparatus is disclosed in which plural digital data are written into a memory and, stored in it. The data is read out in sequence by a clock to get a subsequent group of digital...
4967410 Method of multiplexing digital signals and apparatus therefor  
A high speed digital signal multiplexing method and apparatus are provided wherein a plurality of first higher bit rate transmission frames are provided, each first higher bit rate transmission...
4965796 Microprocessor-based substrate multiplexer/demultiplexer  
A subrate multiplexer (10) is implemented by means of a general-purpose microprocessor (20) that is programmed to perform subrate multiplexing functions, thereby eliminating much of the...
4965787 Methods and apparatus for multiplexing sub-rate channels in a digital data communication system  
Methods and apparatus are set forth which improve the efficiency of bandwidth usage over the CCITT I.463 standard, for switching systems having a granularity of better then 64 Kbps (e.g. 8 Kbps)....
4949339 Multiplexer apparatus adaptable for two kinds of transmission rates  
A multiplexer apparatus supporting variable input bit stream rates in a single device is constructed by common use of a configurable buffer memory and a frequency dividing counter of the reference...
4939722 Time division multiplexer having data rate and number of channels flexibility  
A plurality of multiplexer cells are connected in series to accommodate the multiplexing of different data and channels. Pairs of variable lengths shift registers are utilized in each multiplexer...
4939723 Bit-channel multiplexer/demultiplexer  
An efficient method for time-division multiplexing multiple digital signals into a single data stream for switching and/or transmission of information to a remote location. The apparatus according...
4924459 Digital transmission interconnect signal  
A plurality of digital signals of one or more digital transmission bit rates are combined into a single transmission signal by employing a unique common channel frame format and one step...
4916693 Digital time division multiplex system and method of controlling same  
A time division multiplex system adaptable for branching services, which includes a predetermined level code generator for generating a signal of the same level and a switching unit for switching...
4912702 Conditional multiplexer  
Conditional multiplexer wherein an input bitstream having a variable bitrate is allowed as part of a multiplexed output bitstream of input bitstreams or not depending on the result of an operation...
4905236 Circuit arrangement for designational reading of information of a bit group oriented, continuous information stream at an ISDN-oriented interface  
The reading times for a designational reading of information communicated via an ISDN-oriented interface are formed for a recording device and transmitted thereto with the assistance of a circuit...
4905228 Digital transmission channel framing  
A plurality of digital signals of one or more digital transmission bit rates are arranged to be combined by employing a unique common channel frame format. The channel frame format includes a...
4891805 Multiplexer with dynamic bandwidth allocation  
A method and apparatus for assigning time slots in a frame of time slots used for time division multiplexing, the time slots being representable as a position within the frame, in which it is...
4890283 High definition television augmentation channel  
High transmission and reception quality is achieved in a high definition television system, with minimum intra-channel interference, by digitally encoding the enhancement information and employing...
4881224 Framing algorithm for bit interleaved time division multiplexer  
Methods are provided for multiplexing a plurality of channels on to a sub-aggregate of an aggregate line so as to substantially minimize total frame length. In a preferred method, channel data...
4864562 Sub-rate multi-media data transmission control system  
A substrate multimedia data transmission control system in which transmission frame bits set in a unit of a transmission frame having a repeating cycle of 8 KHz according to the present invention...
4855999 DTDM multiplexer with cross-point switch  
A multiplexer for combining a plurality of relatively sparsely occupied DTDM bit streams into a smaller number of more densely occupied DTDM bit streams at the same bit rate is disclosed. The input...
4839890 Data bit synchronizer  
A data bit synchronizer particularly adapted for use with a multiplexing character processor of the type that multiplexes data characters to and from a plurality of communication lines to a central...
4837786 Technique for mitigating rain fading in a satellite communications system using quadrature phase shift keying  
A system for data communication between ground stations using an orbiting satellite as a relay includes a technique for avoiding the loss of signals from the satellite during periods of heavy...
4792949 Service channel circuit for multiplexed telecommunications transmission systems  
In accordance with the present invention a plurality of input control data bits are added to a plurality of input telecommunications transmission channels in the form of an input control word...
4768191 Digital data and orderwire combiner apparatus  
A digital data and orderwire combiner employs a first and a second inverting gate amplifiers. The first amplifier receives the orderwire signal which is a low rate digital signal, while the second...
4759014 Asynchronous-to-synchronous digital data multiplexer/demultiplexer with asynchronous clock regeneration  
Digital data is received on a plurality of input channels at unrelated, asynchronous input clock rates. The data is multiplexed and transmitted via one or more synchronous parallel channels,...
4752923 Optimal frame arrangement for multiplexing a plurality of subchannels onto a fixed rate channel  
In order to multiplex a plurality of various rate subchannels onto a fixed rate channel, a frame structure is defined consisting of j tuples of bits. Some of the tuples are i bits long and some are...
4751699 Multiplexing and demultiplexing equipments for a synchronous digital link with variable modulation speed and rate  
Multiplexing and demultiplexing equipments are provided for in end stations of a bidirectional synchronous digital link in which one of the multiplexed signals offers a variable rate at the request...
4750172 Method for combining a digital video signal and three digital narrow band signals to form a 139,264 kbit/s signal  
A first plesiochronic digital signal having a bit rate of 135,000 kbit/s, a second plesiochronic digital signal having a bit rate of 1024 kbit/s, a third plesiochronic digital signal having a bit...
4750169 Telephone system and method for transmitting digital information  
A telephone system is described wherein a plurality of subscriber locations are each connected to a central office by a single subscriber loop. A signalling method is used for transmitting...
4740963 Voice and data communication system  
A telephone communication system for transmitting and receiving both voice signals and digital data signals, with no significant distortion to the voice signals and with substantially higher...
4736372 Method and apparatus of transmission for a digital signal  
In a method of transmitting digital signals using so-called pulse stuffing, in which plesiochronous (nearly-synchronous) data signals are transmitted in a main channel of a sum signal channel as...
4730311 Remote multiplexer for digital telephone system  
A multiplexer for use in a telephone system in which a plurality of subscriber locations are connected to a central office by a single subscribe loop is described. The multiplexer unit of the...
4727536 Variable control and data rates in highly efficient multiplexer  
Methods and apparatuses for efficiently allocating bandwidth to data, control and multiplexer overhead and for providing flexible data rates and control rates are provided. The apparatuses of the...
4716561 Digital transmission including add/drop module  
In a transmission system, adding and/or dropping any one or more of a plurality of digital signals of one or more digital transmission bit rates is facilitated by employing a unique transmission...
4698801 Digital exchange system  
A digital exchange system including exchange terminals, a digital network, and a bit rate conversion unit located therebetween. The bit rate conversion unit operates to match low bit-rate channel...
4685106 High rate multiplexer  
A high rate multiplexing system which is capable of operating on multiple channels while ensuring synchronization of the system operation. The system includes a basic timing network for...
4667324 Network multiplex structure  
A time-division multiplexed digital transmission system which utilizes single stage multiplexing and demultiplexing for both synchronous and/or asynchronous bit streams from tributaries of widely...
4658152 Adaptive rate multiplexer-demultiplexer  
A plurality of various rate digital subchannels are multiplexed onto a fixed rate channel by arranging the data bits from the subchannels into a framing structure consisting of j sets of i-tuples...
4646290 Data transmission method and apparatus  
A data transmission method and apparatus, particularly useful in an SCA FM subcarrier data transmission system, is disclosed. The method comprises selectively arranging individual characters of...
4631720 Service integrated transmission system  
A method of transmitting signals of different information rates between a subscriber and a central exchange of a service integrated system operating in time multiplex wherein the signals to be...
4617658 Frame arrangement for multiplexing a plurality of subchannels onto a fixed rate channel  
In order to multiplex a plurality of various rate subchannels onto a fixed rate channel, a frame structure is defined consisting of j sets of i-tuples for a total of ij bits per frame, the...
4594707 High speed limited distance multiplexed data communications modem using a single twisted pair of conductors  
A multiplexed data communications modem providing high speed data communication via a single twisted pair of conductors having a distance up to two kilometers between a plurality of data terminals...
4558445 Applique rate converter  
The applique rate converter permits a digital multiplexer to support any data rate less than half of its input port design rate. The applique rate converter develops a composite data stream...
4550399 Odynamical operating rate allocation process in a multiplex communication system  
This invention relates to a process for automatically allocating appropriate communication rates to different data communication lines connected to a common multiplex channel, in terms of the...
Matches 201 - 250 out of 309 < 1 2 3 4 5 6 7 >