Multiplex communications – Wide area network – Packet switching
Patent
1995-05-16
1996-11-12
Marcelo, Melvin
Multiplex communications
Wide area network
Packet switching
341 94, 371 371, H04L 100
Patent
active
055747175
ABSTRACT:
In an optical transmission system applicable to a SDH network, communication between two line terminating equipments is performed in a form of a STM frame composed of a SOH field and a payload, which is determined by CCITT recommendations. The line terminating equipment provides a FEC circuit which is preferably arranged at a location between MSP and MST function blocks. The FEC circuit is designed to perform coding/decoding operations, using a cyclic Hamming code, directly on each AU-4 message derived from the STM frame. Otherwise, the FEC circuit performs operations on each k-bit interleaved AU-4 message (where `k` is an integer larger than 1). Check bits generated by a FEC coding circuit are written into undefined byte areas in a MSOH field, and error correcting is performed at a decoder circuit on the basis of embedded check bits, therefore FEC operations are performed within a multiplex-section layer. A FEC processing circuit is constituted by shift registers each of which is connected by exclusive-or logic so as to execute FEC processing calculation generating a remainder by a generator polynomial. For a FEC code on direct AU-4 message, the FEC processing circuit in parallel configuration for lowering an operational clock rate is determined by a matrix form calculation, which creates an output vector indicating a set of shift registers' data in a future clock timing from an input vector consisting of data stream in message and initial shift registers' values.
REFERENCES:
patent: 4397022 (1983-08-01), Weng et al.
patent: 4723244 (1988-02-01), Iacoponi
patent: 5010554 (1991-04-01), Bechtel et al.
patent: 5144304 (1992-09-01), McMahon et al.
V. Paxal et al., "Error-Correction Coding for High-Speed Optical Transmission Systems Based on the Synchronous Digital Hierachy," European Transactions on Telecommunications, vol. 4, No. 6, Nov.-Dec. 1993 pp. 623-628.
P. M. Gabla et al., "401 km, 622 Mb/s and 357 km, 2.488 Gb/s IM/DD Repeaterless Transmission Experiments Using Erbium-Doped Fiber Amplifiers and Error Correcting Code," IEEE, Photonics Technology Letters, Oct. 1992, vol. 4, No. 10, pp. 1148-1151.
K. Aoyama et al., "Design and Operation of Transmission Lines Containing Er-Doped Fiber Amplifier Repeaters," IEEE 1992, pp. 1875-1879.
P. Moro et al., "565 Mb/s Optical Transmission System for Repeaterless Sections up to 200 Km," IEEE 1991, pp. 1217-1221.
W. D. Grover et al., "Design and Characterization of an Error-Correcting Code for the SONET STS-1 Tributary," IEEE Transactions on Communications, vol. 38, No. 4, Apr. 1990, pp. 467-477.
Kobayashi Yukio
Nakagawa Kiyoshi
Tomizawa Masahito
Yagisawa Ken-ichi
Yamabayashi Yoshiaki
Marcelo Melvin
Nippon Telegraph and Telephone Corporation
LandOfFree
Line terminating equipment in SDH networks, using forward error does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Line terminating equipment in SDH networks, using forward error , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Line terminating equipment in SDH networks, using forward error will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-568776