TW366639B - A method and device for detecting a ringtrip - Google Patents
A method and device for detecting a ringtripInfo
- Publication number
- TW366639B TW366639B TW085115742A TW85115742A TW366639B TW 366639 B TW366639 B TW 366639B TW 085115742 A TW085115742 A TW 085115742A TW 85115742 A TW85115742 A TW 85115742A TW 366639 B TW366639 B TW 366639B
- Authority
- TW
- Taiwan
- Prior art keywords
- zero
- ring
- phase difference
- previous
- cycles
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
Abstract
A ringtrip detector comprises a reference counter for controlling a battery current generator, which shapes the ring signal, a zero pass detector for detecting zero passes in a voltage at a node, which is proportional to the telephone line current and two other counters. The zero passes of the voltage create a pulse at both the positive and the negative zero crossing of the zero pass detector. The reference counter is gated into a memory, when these pulses appear. The zero passing of the previous and the present ring cycle are stored in the memory. A counter decides the difference between the previous and the present ring cycles zero passes. If the zero pass difference between the present and previous ring cycles is greater than a fixed value, the output will indicate a "phase difference" and if it is less than the fixed value, it will indicate "no phase difference". Another counter counts a predetermined number of successive ring cycles with "no phase difference" at the start of a ring burst signal, and after establishing the ring burst signal, another predetermined number of successive ring cycles with "phase difference" is counted to detect the ringtrip.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9604545A SE511917C2 (en) | 1996-12-10 | 1996-12-10 | Method of device for detecting a ring disconnection |
Publications (1)
Publication Number | Publication Date |
---|---|
TW366639B true TW366639B (en) | 1999-08-11 |
Family
ID=20404927
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW085115742A TW366639B (en) | 1996-12-10 | 1996-12-20 | A method and device for detecting a ringtrip |
Country Status (6)
Country | Link |
---|---|
JP (1) | JP2001506081A (en) |
KR (1) | KR100518253B1 (en) |
CN (1) | CN1156139C (en) |
CA (1) | CA2274525A1 (en) |
DE (1) | DE69734112T2 (en) |
TW (1) | TW366639B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110850151B (en) * | 2019-11-04 | 2022-04-12 | 易事特集团股份有限公司 | Zero-crossing determination method and zero-crossing determination device |
-
1996
- 1996-12-20 TW TW085115742A patent/TW366639B/en active
-
1997
- 1997-11-18 DE DE69734112T patent/DE69734112T2/en not_active Expired - Fee Related
- 1997-11-18 CN CNB971816824A patent/CN1156139C/en not_active Expired - Fee Related
- 1997-11-18 CA CA002274525A patent/CA2274525A1/en not_active Abandoned
- 1997-11-18 KR KR10-1999-7005089A patent/KR100518253B1/en not_active IP Right Cessation
- 1997-11-18 JP JP52654398A patent/JP2001506081A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
CA2274525A1 (en) | 1998-06-18 |
KR100518253B1 (en) | 2005-09-30 |
JP2001506081A (en) | 2001-05-08 |
DE69734112T2 (en) | 2006-07-13 |
DE69734112D1 (en) | 2005-10-06 |
CN1156139C (en) | 2004-06-30 |
KR20000069368A (en) | 2000-11-25 |
CN1245611A (en) | 2000-02-23 |
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