Title:
【発明の名称】データ誤り検出装置
Document Type and Number:
Japanese Patent JP3026444
Kind Code:
B2
Abstract:
An apparatus for executing loop-back tests in a key service unit (50) of a key telephone system, including an ISDN interface unit (2) connected to an ISDN (30) is disclosed. When any one of speech channels of the ISDN (30) is not used, a predetermined test pattern data is transmitted through a time slot of the down-stream speech highway (3b) allocated to the unused speech channel to the ISDN interface unit (2). Then the test pattern data is returned back in the ISDN interface unit (2) and transmitted to a time slot of the up-stream speech highway (3a) allocated to the unused speech channel. The test pattern data transmitted to the up-stream speech highway is compared with the original test pattern data for executing the loop-back test.
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Inventors:
Hiroshi Mano
Application Number:
JP754290A
Publication Date:
March 27, 2000
Filing Date:
January 17, 1990
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
H04M3/26; H04M3/24; H04M9/00; H04Q3/58; H04Q11/04; (IPC1-7): H04M3/26; H04Q3/58
Domestic Patent References:
| JP61154343A | ||||
| JP62237851A | ||||
| JP22785A |
Attorney, Agent or Firm:
Kazuo Sato (3 others)