摘要:
The invention is a system for interfacing (200) a GR-303 system (220, 222) with a broadband system (BROADBAND NETWORK). The broadband system can be an ATM system. The invention can process (360) the GR-303 signaling to select ATM connections and then interwork the GR-303 connections with the selected ATM connections. The invention can interwork (362) GR-303 signaling and SS7 signaling. The invention can also process SS7 signaling to select GR-303 connections and then interwork ATM connections with the selected GR-303 connections.
摘要:
In a subscriber loop equipment (10) having a subscriber bus (26), there is provided an odd data stream carrying a first set of data time slots of an E1 signal and a first set of signaling and control time slots of the E1 signal, and an even data stream carrying a second set of data time slots of the E1 signal and a second set of signaling and control time slots of the E1 signal. The odd and even data streams are bit-interleaved and transported on the subscriber bus (26).
摘要:
Die Erfindung betrifft ein Verfahren zum Zuteilen von Zeitschlitzen in einem System mit mehreren über ein gemeinsames Medium mit einer Zentrale (HUB) verbundenen Teilnehmereinrichtungen (NT) von Teilnehmern, wobei das gemeinsame Medium in mehrere Frequenz- oder Wellenlängenkanäle unterteilt ist, die wiederum in Zeitschlitze unterteilt sind, bei dem durch die Zentrale Zeitschlitze an mindestens einen Teil der Teilnehmereinrichtungen zugeteilt werden durch Angabe je eines Kanals und einer Zeitschlitznummer für jeden zugeteilten Zeitschlitz, bei dem jede betroffene Teilnehmereinrichtung nach jedem benützten Zeitschlitz auf den nächsten zugeteilten Kanal wechselt und bei dem jede betroffene Teilnehmereinrichtung im Zeitschlitz mit der nächsten zugeteilten Zeitschlitznummer Information sendet, sowie ein System, eine Zentrale und eine Teilnehmereinrichtung zur Durchführung dieses Verfahrens.
摘要:
STM traffic, e.g. voice and video telephony (VT), as well as packet mode (e.g. ATM) traffic, e.g. broadcast digital video, interactive television, and data, are transmitted via a multiple access broadband fiber/coaxial cable network. Customer premises equipment (CPE) at stations, and a bandwidth controller, which may be at a head end or central office, with which all stations communicate, work together to adapt to the changing demands of the traffic mix, and efficiently allocate bandwidth to a variety of bursty and isochronous traffic sources. The bandwidth allocation defines two types of time slots, STM and ATM, and divides each frame into two corresponding STM and ATM regions. The boundary between the regions can be changed dynamically. A contention access signaling channel is provided in the STM region, for call control and set-up requests. Within the STM region, the time slots can be of variable length and be allocated on a per call basis; the length of the time slots is proportional to the bandwidth requirement of STM calls. Within the ATM region, the time slots are of fixed length, each capable of accommodating one ATM cell. Further, the fixed length ATM time slots may be reserved for a particular user for the duration of a call, or may be shared through a contention process. At least one contention ATM time slot is always made available for signaling messages related to ATM call control and set-up requests. The downstream time frame is structured in a similar manner, but includes an additional MAP field to transmit to the stations ATM time slot allocation and status information for time slots in the upstream channel.
摘要:
A broadband communications system for coupling telephony (10) or other digital networks to a CATV network (12). The system transmits a multiplex of telephony signals in the forward band of the CATV network. Each forward channel is QPR modulated on a carrier and contains multiple subscriber telephony signals. The forward telephony channels are demodulated and multiplexed by a plurality of subscriber terminals into the individual telephony signals directed to an addressed subscriber. Audio and control signals returning from the subscriber are digitized into standard telephony signals and QPSK modulated on a carrier onto the reverse band of the CATV network. The multiplicity of reverse band telephony channels are demodulated and multiplexed into a standard telephony signal which is directly interfaced to the telephony network. The reverse band modulators are frequency agile and modulate telephony signals from a subscriber in a selected one or more frequency subbands in the reverse band of the subscription network.
摘要:
A SONET path/ATM physical layer transmit/receive processor ASIC for OC-48 makes use of a 32-bit wide interface between a source/destination and the rest of the processor. Adjacent the interface is an ATM cell processor, and between the ATM cell processor and a transmission medium is a SONET payload processor. Selectors are located between the transmission medium and the SONET payload processor, the SONET payload processor and the ATM cell processor, and the ATM cell processor and the interface so that the processor provides a SONET path, a SONET path/ATM physical layer path, an ATM physical layer path or a fast FIFO buffer path according to the configuration of the selectors determined by user commands from a command logic circuit coupled to each of the interface, ATM cell processor and the SONET payload processor.
摘要:
To signal a failure in a mixed PDH/SDH network in order to enable this network to provide a service such as a protection mechanism, an alarm indication has to be provided to an SDH node in the event of that failure. A PDH node linked to that SDH node creates an alarm data stream and provides this alarm data stream to the SDH node in the event of any of :
an internal PDH node failure; and a link failure between the previous node and the PDH node; and upon reception of such an upstream created alarm data stream; The SDH node creates the alarm indication in the event of any of :
a link failure between the PDH node and the SDH node; and upon reception of such an alarm data stream coming from the PDH node.
摘要:
In ITU Recommendation G.783 a method is described for interpreting the pointer for SDH devices. The invention provides an alternative method to be used when the pointers are generated inside or near the demultiplexing equipment and the signal does not cross a line of the transmission network, and therefore it can be assumed that there are no errors. According to the method provided herein, by using a combinatory logic it is possible to obtain a greater circuit simplicity and through the interpretation based exclusively on the last received sample of the data representing the pointer value, higher interpretation rates are obtained.
摘要:
Bei digitalen Übertragungssystemen, z.B. einem synchronen Übertragungssystem gemäß dem SDH/SONET-Standard, besteht das Interesse, Kenntnis über den Synchronisierungszustand des Übertragungssystems zu haben. Eine bekannte Vorgehensweise ist die Überwachung der Zeigeraktivität. Nachteilig daran ist, daß aus der Zeigeraktivität gewonnene Information wegen einer Hysterese im Zeigerprozessor nur bedingt den Synchronisierungszustand widerspiegelt. Bei einem erfindungsgemäßen Netzelement (1), das in einem o.g. Übertragungssystem vorhanden ist, hat mindestens eine Schnittstelleneinrichtung (2, 3, 4) neben einem optoelektrischen Wandler (5) eine Synchronisierungsüberwachungseinrichtung (6), die aus einem Vergleich einer externen Taktfrequenz (T e ) mit einer internen Taktfrequenz (T i ) einen Synchronisierungszustandsparameter, z.B. TIE, RMSTIE, ableitet. Dafür hat die Synchronisierungsüberwachungseinrichtung (6) eine Phasenvergleichseinrichtung (37), eine Speichereinrichtung (25) und eine Auswerteeinrichtung (26).
摘要:
A first data flow (DS1) for a first data transmission system (DÜ1) with a first data rate contains ATM data cells (2, 3, 4) and structure data (10, 11, 12) allocated to a section (13) consisting of several ATM cells and divided and spaced out according to predetermined instructions. The data flow (DS1) is converted, while retaining its ATM data cell format, into a second data flow (DS2) containing only ATM data cells for a second data transmission system (DÜ2) with a second, higher data rate. Here, the structure data (10, 11, 12) are separated from the first data flow and entered into a marked structure cell (64) with an ATM data cell format for the section concerned. The structure cell (64) is inserted into a second data flow (DS2) so as partly to fill an unoccupied section resulting from the differing data rates.