JPS6437141A - Communication equipment - Google Patents
Communication equipmentInfo
- Publication number
- JPS6437141A JPS6437141A JP62192587A JP19258787A JPS6437141A JP S6437141 A JPS6437141 A JP S6437141A JP 62192587 A JP62192587 A JP 62192587A JP 19258787 A JP19258787 A JP 19258787A JP S6437141 A JPS6437141 A JP S6437141A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- counter
- synchronism
- detection signal
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Time-Division Multiplex Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
PURPOSE:To surely detect synchronism even if a violation detection signal goes to the high level in an irregular position, by comparing a ripple carry signal of a counter which counts the bit length of a frame and the violation detection signal with each other to detect synchronism. CONSTITUTION:If synchronism is not established when a violation detection signal 20 is inputted, an AND circuit 2 is opened and a load signal is outputted to a counter 4 and the number of bits in one frame is set. Meanwhile, if synchronism is established, an AND circuit 1 is opened at the time of turning-on of a ripple carry signal 7 of the counter 4 and the number of bits in one frame is loaded to the counter 4. A comparing circuit 5 outputs a synchronism establishing signal 22 if the carry signal 7 from the counter 4 is turned on when the detection signal 20 is inputted, but a step out signal 8 is turned on unless signals 7 and 20 are simultaneously inputted.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62192587A JP2605051B2 (en) | 1987-08-03 | 1987-08-03 | Communication device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62192587A JP2605051B2 (en) | 1987-08-03 | 1987-08-03 | Communication device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6437141A true JPS6437141A (en) | 1989-02-07 |
JP2605051B2 JP2605051B2 (en) | 1997-04-30 |
Family
ID=16293760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62192587A Expired - Fee Related JP2605051B2 (en) | 1987-08-03 | 1987-08-03 | Communication device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2605051B2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60144046A (en) * | 1984-01-06 | 1985-07-30 | Nec Corp | Frame synchronization circuit |
JPS60172855A (en) * | 1984-02-03 | 1985-09-06 | Nippon Telegr & Teleph Corp <Ntt> | Multiphase synchronizing circuit |
-
1987
- 1987-08-03 JP JP62192587A patent/JP2605051B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60144046A (en) * | 1984-01-06 | 1985-07-30 | Nec Corp | Frame synchronization circuit |
JPS60172855A (en) * | 1984-02-03 | 1985-09-06 | Nippon Telegr & Teleph Corp <Ntt> | Multiphase synchronizing circuit |
Also Published As
Publication number | Publication date |
---|---|
JP2605051B2 (en) | 1997-04-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |