Title:
【発明の名称】通信システム
Document Type and Number:
Japanese Patent JP3126606
Kind Code:
B2
Abstract:
The possibility of passing off apparent "good" higher level digital signals that may include corrupted or failed lower level digital signals because of inter-ring grooming of the lower level digital signals from one path-switched ring to another path-switched ring employing at least a first shared node and a second shared node is minimized by dual feeding communications circuits from one path-switched ring to the other via the shared nodes and by provisioning at least one inter-ring groomed communications circuit from a secondary ring node of one of the shared nodes (secondary communications circuit) of a particular ring to be supplied to a primary ring node in the other shared node of the same ring. The at least one secondary communications circuit is obtained in the primary ring node and demultiplexed so that the lower level digital signals in the at least one communications circuit can be evaluated on a one-to-one pairwise basis with corresponding lower level digital signals in the corresponding at least one communications circuit (primary communications circuit) being supplied from the inter-ring grooming apparatus associated with the primary ring node. The the "best" of the lower level signals in each are selected and are combined into a "new" primary communications circuit which is dual fed in the primary ring node in one direction to its termination ring node and in the other direction through the secondary ring node to the termination ring node. transmission path. A selector in the secondary ring node is revertively biased to normally select the "new" primary communications circuit to be supplied to the termination ring node. However, in the case of a primary communication circuit failure because of an interconnect or other failure in the primary ring node, the selector will then select the secondary communication circuit to be supplied to the termination ring node for the primary ring node. The provisioning of the primary ring node and the secondary ring is such that the demultiplexing to obtain the lower level digital signals, their evaluation and selection, and multiplexing only need to be done in the primary ring node and not in both.
Inventors:
Wilhelm Kremer
Application Number:
JP28155794A
Publication Date:
January 22, 2001
Filing Date:
October 21, 1994
Export Citation:
Assignee:
AT&T CORP.
International Classes:
H04J3/08; H04L12/46; H04Q11/04; (IPC1-7): H04L12/437
Domestic Patent References:
| JP563698A | ||||
| JP591103A |
Other References:
Ｈａｑｕｅ，Ｉ．；Ｋｒｅｍｅｒ，Ｗ．；Ｒａｙｃｈａｕｄｈｕｒｉ，Ｋ．”Ｓｅｌｆ−Ｈｅａｌｉｎｇ Ｒｉｎｇ ｉｎ ａ Ｓｙｎｃｈｒｏｎｏｕｓ Ｅｎｖｉｒｏｍｅｎｔ”，ＩＥＥＥ ＬＴＳ ［ｓｅｅ ａｌｓｏ ＩＥＥＥ ＬＣＳ］Ｖｏｌｕｍｅ：２ ４，Ｎｏｖ．１９９１，Ｐａｇｅ（ｓ）：３０−３７
Attorney, Agent or Firm:
Hirofumi Mitsumata