EP0477553A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for testing ATM channels
Assignee: Fujitsu Ltd
•
Filing: 1991-08-27
•
Granted: —
•
Expires: 2011-08-27
Abstract
Abstract A first form of an ATM channel testing apparatus tests an ATM channel by having a test cell detector (307) in each switch (306) detect whether or not the switch appropriately switches a test cell (303) generated by a test cell generating trunk (302). A second form of an ATM channel testing apparatus easily tests an ATM channel by having test cell generators (404) provided for the respective input highways (402) sequentially generate test cells to which test cell identifying information and input highway identifying information and having test cell monitor (405) provided for the respective output highways (403) simply tally the test cells by the respective input highways. A third form of an ATM channel testing apparatus tests an ATM channel with less pieces of hardware by having turnaround parts (507) in respective ordinary trunks (501) sequentially turn around a test cell (504) generated by a test cell generating trunk (503) to be finally returned to the test cell generating trunk. <IMAGE> <IMAGE> <IMAGE>
Inventors
- 👤 Yoshihiro Uchida
- 👤 Satoshi Kakuma
- 👤 Naoyuki Izawa
- 👤 Yasuhiro Aso
- 👤 Shuji Yoshimura
- 👤 Masami Murayama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 21:52
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/30; H04L49/3009; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L43/00; H04L43/50; H04L49/10; H04L49/104; H04L49/105; H04L49/106; H04L49/15; H04L49/1553; H04L49/3081; H04L49/309; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04L2012/5628; H04L2012/5672; H04L2012/5678; H04L2012/5681
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
154 words
An ATM channel testing apparatus for testing an asynchronous transfer mode channel comprising: a test cell generating trunk means, provided on the input side of said asynchronous transfer mode channel, for generating a test cell to whose head end a tag including test cell information, which identifies a test cell and specifies the passage of a predetermined path in said asynchronous transfer mode channel, is attached, and for supplying the test cell to said asynchronous transfer mode channel; a test cell detecting means, provided in a switch forming said asynchronous transfer mode channel, for detecting as maintenance scan signal whether or not said test cell is switched; and a controlling means for testing a switch on a path by judging whether or not said test cell detecting means provided in said switch on said path corresponding to the test cell information included in said test cell, synchronized with the generation of said test cell.
Claim 2
Dependent Claim
38 words
The ATM channel testing apparatus according to claim 1, wherein: said asynchronous transfer mode channel comprises a multi-stage self-routing channel having self-routing modules connected in plural stages and said switch is provided in each of said self-routing modules.
Claim 3
Dependent Claim
43 words
The ATM channel testing apparatus according to claim 1, wherein: said test cell generating trunk means is provided in each input highway connected to said asynchronous transfer mode channel and multiplexes said test cell on said input highway at its free cell timing.
Claim 4
Dependent Claim
64 words
The ATM channel testing apparatus according to claim 3, wherein: said tag attached to said head end of said test cell generated by said test cell generating trunk means includes test cell information instructing said test cell to pass through each said switch in said asynchronous transfer mode channel corresponding to said input highway in which said test cell generating trunk means is provided.
Claim 5
Dependent Claim
63 words
The ATM channel testing apparatus according to claim 1, wherein: said controlling means tests said switch on said path by judging whether or not said test cell detecting means in said switch on said path specified by said test cell information included in said test cell in a predetermined period of time after said test cell generating trunk means generates said test cell.
Claim 6
Dependent Claim
190 words
An ATM channel testing apparatus for testing an asynchronous transfer mode channel formed by self-routing modules connected in multiple stages for switching cells supplied from a plurality of input highways respectively to a plurality of output highways, comprising: test cell generating means, provided respectively in said input highways, for sequentially generating a plurality of test cells for enabling all crossing points in said self-routing modules through which cells inputted from said input highways can pass, said test cells having test cell identifying information for identifying themselves as test cells and input highway identifying information; and test cell monitoring means, provided respectively in said output highways, for monitoring whether or not a predetermined number of test cells supplied respectively from said input highways corresponding to the number of all possible paths on said self-routing modules for a cell inputted from one of said input highways to be outputted to one of said output highways, by extracting said test cells through extraction of said test cell identifying information from cells outputted from said self-routing modules to said output highways and by extracting said input highway identifying information from said extracted test cells.
Claim 7
Dependent Claim
72 words
The ATM channel testing apparatus according to claim 6, wherein: said test cell generating means are provided in virtual channel converters for converting virtual path identifiers or virtual channel identifiers to pieces of tag information, and said test cells generated by said test cell generating means have pieces of tag information enabling all crossing points in said self-routing modules through which cells inputted from said input highways can pass to switch cells.
Claim 8
Dependent Claim
57 words
The ATM channel testing apparatus according to claim 7, wherein: said test cell generating means attach said input highway identifying information and said test cell identifying information to free regions in the tag parts set in the head ends of said test cells storing said tag information attached to said test cell by said virtual channel converter.
Claim 9
Dependent Claim
55 words
The ATM channel testing apparatus according to claim 6, wherein: said test cell monitoring means tests said self-routing modules by monitoring whether or not a predetermined number of test cells from each of said input highways are detected in a predetermined period of time after said test cell generating means begin generating said test cells.
Claim 10
Dependent Claim
137 words
An ATM channel testing apparatus for testing a plurality of ordinary trunks for interfacing with foreign offices and an asynchronous transfer mode channel for switching cells inputted from plural input highways through said ordinary trunks to a plurality of output highways, comprising: a test cell generating trunk means, provided on the input side of said asynchronous transfer mode, for generating a test cell whose header part has a test cell identification bit identifying itself as a test cell and for supplying said test cell to said asynchronous transfer mode channel; and turnaround means, provided respectively in said ordinary trunks, for extracting said test cell by extracting said test cell identification bit from cells sent through said asynchronous transfer mode channel, and for turning said extracted test cell around to tested paths, on said asynchronous transfer mode channel.
Claim 11
Dependent Claim
103 words
The ATM channel testing apparatus according to claim 10, wherein: said test cell generating trunk means stores in the information part of said test cell path selection information specifying the tested paths in said asynchronous transfer mode: said ATM channel testing apparatus further comprising a tag operating means for replacing a tag attached to the head end of said test cell turned around by any one of said turnaround means in said ordinary trunks with another based on said path selection information stored in said information part of said test cell and for supplying said test cell to said asynchronous transfer mode channel.
Claim 12
Dependent Claim
36 words
The ATM channel testing apparatus according to claim 11, wherein: said test cell generating trunk means attaches to the head end of said test cell the tag addressing the first ordinary trunk on said tested paths.
Claim 13
Dependent Claim
119 words
The ATM channel testing apparatus according to claim 10, wherein: said test cell generating trunk means stores in said information part of said test cell path selection information specifying the tested paths in said asynchronous transfer mode channel terminated at said test cell generating trunk means: said ATM channel testing apparatus further comprising a controlling means for testing said asynchronous transfer mode channel by comparing the content of said test cell generated by judging whether or not said test cell generated by said test cell generating trunk means returns to said test cell generating trunk means and by said test cell generating trunk means with the content of said test cell returned to said test cell generating trunk means.
Claim 14
Dependent Claim
42 words
The ATM channel testing apparatus according to claim 10, wherein: said turnaround means in said ordinary trunks turn said extracted test cell around to tested paths on said asynchronous transfer mode cannel at the corresponding free cell timings of said input highways.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.