摘要:
Transmission equipment (1) in which, when a frame is received from a network, an output physical port is decided by a path deciding section (14) and a corresponding output logical port is decided by an output physical port deciding section (15). The frame is outputted to the output physical port, and when following received frames are successively transmitted, an output physical port number, to which each frame is outputted, is incremented by a port number increment section (18) each time a frame is transmitted, and a destination to which the frame is outputted is switched among output physical ports.
摘要:
A channel-to-channel skew compensation apparatus is provided with N number of frame synchronization circuits (11) for generating frame signals to indicate data position of parallel data on a common time axis for each data transmission channel; a reference timing determination circuit (16) for determining a reference timing based on N frame signals output from the frame synchronization circuit (11); a skewing amount detection section (15) for generating N skewing amount signals according to the reference timing determined by the reference timing determination circuit (16); and a timing compensation section (13) for adjusting output timing of parallel data for each transmission channel according to the skewing amount signal generated by the skewing amount detection section (15).
摘要:
Die vorliegende Erfindung betrifft ein Verfahren und eine Vorrichtung zur Fernübertragung von Daten, bei welchem zur Erhöhung der Übertragungsgeschwindigkeit in einem Eingangskanal (1) anstehende Daten auf mindestens zwei Übertragungskanäle (20') jeweils begrenzter Übertragungskapazität aufgeteilt, entlang der Übertragungsstrecke übermittelt, synchronisiert empfangen und in der ursprünglichen Anordnung in einen Ausgabekanal (3') gegeben werden, der seinerseits mit einem Speicher oder einer Datenverarbeitungseinrichtung verbunden ist. Um eine höhere Datenübertragungsgeschwindigkeit zu ermöglichen, wobei die Zahl der Übertragungskanäle in weiten Bereichen beliebig variierbar ist, wird erfindungsgemäß vorgeschlagen, daß in allen Übertragungskanälen (20') in fester relativer Zeitbeziehung ein Ausrichtsignal gesendet wird, welchem die Übertragung von Datensignalen folgt, wobei die sich beim Empfang des Ausrichtsignales ergebenden Laufzeitunterschiede in den verschiedenen Übertragungskanälen (20') dadurch berücksichtigt werden, daß nach dem Empfang eines Ausrichtsignales in einem Übertragungskanal (20') die in diesem Übertragungskanal (20') folgenden Daten in einen FIFO-Speicher (50) (First In First Out-Speicher) eingelesen und entsprechend der senderseitig festgelegten Reihenfolge erst dann aus den FIFO-Speichern (50) ausgelesen werden, wenn in allen benutzten Übertragungskanälen (20') das Ausrichtsignal empfangen worden ist.
摘要:
Procédé de transmission de signaux possédant un débit binaire supérieur au débit binaire prédéterminé dans un système de transmission de données numériques fournissant normalement des canaux de données discrets possédant le débit binaire de base prédéterminé, les canaux étant soumis à différentes caractéristiques de retard de propagation dans le système. Un groupe de k canaux de données à débit binaire prédéterminé est affecté comme canal virtuel de transmission desdits signaux à débit binaire élevé. Un canal de service est défini dans l'un des canaux du groupe. Les signaux à débit binaire élevé sont divisés en n sous-signaux, où nk, possédant un débit binaire égal ou inférieur au débit binaire prédéterminé. Les n sous-signaux sont transmis par les canaux de données, les signaux de service sont transmis par intermittence par les canaux dans des tranches attribuées normalement aux données. Ces tranches de données sont transmises par le canal de service tandis que les signaux de service sont transmis dans les tranches qui leur sont attribuées. Les signaux de service sont utilisés à l'extrémité pour rassembler les n sous-signaux dans ledit signal de données original à débit binaire élevé.
摘要:
An Inverse Multiplexer is disclosed which first demultiplexes a first data rate input signal into a plurality of second lower data rate subsectional signals, where each subsectional signal is provided with a periodic synchronization marker and includes a data rate which is less than the channel data rate used to transmit that subsectional signal to a remote terminal. Programmable Multiplexers (PMUXs) then operate to each take one or more subsectional signals that are (1) clock synchronized to a PMUX clock, and (2) a rational fraction of the channel data rate, and map contiguously assigned time slots in a capacity domain frame for each subsectional signal to time slots of a time domain frame format using a 2-step or 3-step digit reverse technique. The resultant time domain format has the input subsectional capacity domain time slots substantially uniformly distributed over the time domain frame. At the receiving end, an Inverse Demultiplexer performs the reverse operation to recover the original first data rate input signal.
摘要:
An Inverse Multiplexer is disclosed which first demultiplexes a first data rate input signal into a plurality of second lower data rate subsectional signals, where each subsectional signal is provided with a periodic synchronization marker and includes a data rate which is less than the channel data rate used to transmit that subsectional signal to a remote terminal. Programmable Multiplexers (PMUXs) then operate to each take one or more subsectional signals that are (1) clock synchronized to a PMUX clock, and (2) a rational fraction of the channel data rate, and map contiguously assigned time slots in a capacity domain frame for each subsectional signal to time slots of a time domain frame format using a 2-step or 3-step digit reverse technique. The resultant time domain format has the input subsectional capacity domain time slots substantially uniformly distributed over the time domain frame. At the receiving end, an Inverse Demultiplexer performs the reverse operation to recover the original first data rate input signal.
摘要:
An improved data transmission system has a transmitter which includes a modulator responsive to a synthesized modulating signal, which provides for transmission of data substreams on parallel subchannels, for example, by using subcarrier frequencies. At the receiver the subcarriers are received and data is selected from the received subcarriers at two diverse receivers. in addition, there are provided signals added to the transmitted data for retiming the data at the receiver.
摘要:
@ A broadband digital transmission system enables high bit rate data stream to be transmissed over low bit rate telephone networks. A high bit rate stream of data from a source 2 is distributed by a distributor 4 into six separate streams to provide six low bit rate streams of data. A call unbit 6 establishes six channel communication with a receiver 20 and the six data streams are fed in parallel along the six channels. A reassembler 34 receives the six low bit rate streams and reconstructs them to produce the original high bit rate stream of data.