Multiplex communications – Wide area network – Packet switching
Patent
1990-12-05
1993-11-23
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
370112, H04J 304
Patent
active
052650952
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to a method for outputting signals from at least one subarea of auxiliary signals and for inputting new or modified signals into at least one free of freed up subarea of transport modules of a synchronous digital signal hierarchy according to the CCITT Draft Recommendations G.70X, G.70Y and G.70Z, in accord wherewith the frame of the transport modules is composed of 9 rows and N-times 270 columns (N is a whole number) for respectively one byte per row and column and contains an administration unit for the acceptance of virtual containers whose frame start is marked by pointers.
Standardized bit rates between 64 kbit/s and 139 264 kbit/s are listed in the "CCITT Red Book", Vol. III-Fascicle III.3, Digital Networks-Transmission Systems and Multiplexing Equipment, Geneva, 1985, page 41.
The periodical "Telecommunications", March 1988, pages 63, 65 and 66 describes synchronous digital signal hierarchies for international use that are known under the designations SONET (synchronous optical network) and NNI (network node interface).
The afore-mentioned CCITT Draft Recommendations contain NNI definitions. Digital signals having a bit rate of 155 520 kbit/s are transmitted in the lowest hierarchy level. Their pulse frame is referred to as a synchronous transport module STM-1. The next hierarchy level is intended for the four-fold bit rate 622 080 kbit/s and synchronous transport modules STM-4. Synchronous transport modules STM-8, STM-12 and STM-16 are possible. In addition to the useful signals, auxiliary signals such as section overhead, path overhead, pointer and fixed stuff bits are contained in these transport modules.
The publication "GLOBECOM'85 IEEE, Global Telecommunications Conference, Conference Record Volume 3 of 3, New Orleans, La., 2 through 5 December 1985, pages 1443 through 1450, particularly FIG. 11, discloses an add drop multiplexer. This serves the purpose of multiplexing STS signals and also serves the purpose of outputting STS-1 signals from incoming STS-N signals of a higher hierarchy level. STS signals are composed of pulse frame having a header for auxiliary signals and of a main part for signals to be transported that can in turn themselves contain auxiliary signals in the form of a path overhead. An inputting and outputting of auxiliary signals or subareas thereof is not provided.
U.S. Pat. No. 4,574,375, finally, discloses a an interface arrangement for a telephone system or the like. In this, complete digital signals incoming on a bus line have their channel nested in a pulse frame taken for a processing such as setting signal level, dual tone multi-frequency signaling or network echo elimination and are subsequently returned onto a bus line. Here, too, neither auxiliary signals nor subareas thereof are separately input or output.
SUMMARY OF THE INVENTION
It is an object of the invention to output signals from subareas of these auxiliary signals of a transport module and to make them available capable of being further-processed in an optimally flexible way, as well as, conversely, to input signals into such subareas.
This object is inventively achieved by a method in which: the subareas are spread; the spread subareas are combined serially or in parallel to a bus together with additional control signals; bytes or byte groups are parted from the bus as signals and are output; and, for inputting, these method steps are implemented in the reverse sequence and in the opposite sense.
For transport modules of a higher order, before the outputting, a transport module of the higher order is resolved into transport modules of a lower order, and, when inputting, transport modules of a lower order are combined to form a transport module of the higher order in the corresponding method step.
Alternatively, for transport modules of a higher order, when outputting from subareas that are formed of subareas of a plurality of transport modules, these are separated after the spreading, and, when inputting, a plurality of subareas are combined befor
REFERENCES:
patent: 4719624 (1988-01-01), Bellisio
patent: 5060229 (1991-10-01), Tyrrell et al.
Fiedler Udo
Lechler Walter
Musil Gerhard
Volejnik Wilhelm
Weimert Guenter
Chin Wellington
Siemens Aktiengesellschaft
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