JPS57129046A - Frame synchronization protecting circuit - Google Patents
Frame synchronization protecting circuitInfo
- Publication number
- JPS57129046A JPS57129046A JP56013927A JP1392781A JPS57129046A JP S57129046 A JPS57129046 A JP S57129046A JP 56013927 A JP56013927 A JP 56013927A JP 1392781 A JP1392781 A JP 1392781A JP S57129046 A JPS57129046 A JP S57129046A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- collector
- circuit
- voltage
- comparing circuit
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0079—Receiver details
- H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Time-Division Multiplex Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
PURPOSE:To prevent out-of-frame by a simple circuit configuration, by using a current switching circuit, an RC time constant element, a limiter and a voltage comparing circuit. CONSTITUTION:A parallel circuit consisting of a resistance Rc and a capacitor C is provided on the collector of a transistor TR2 of a current switching circuit constituted of transistors TR1, TR2, and an output of the collector is provided to a negative (-) input terminal 30 of a voltage comparing circuit 33 through a limiter 26. When a burst error which is larger than reference voltage Vref applied to the base of the transistor TR2 is applied to the base of the transistor TR1, a collector current flows to the transistor TR2, and the capacitor C is charged. When the collector voltage of the transistor TR2 attains to threshold voltage of the voltage comparing circuit 33, a protecting output is generated from the voltage comparing circuit 33. In this case, even if the burst error annihilates, the protecting output is continued only for a period decided by a discharge time of an RC time constant element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56013927A JPS57129046A (en) | 1981-02-02 | 1981-02-02 | Frame synchronization protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56013927A JPS57129046A (en) | 1981-02-02 | 1981-02-02 | Frame synchronization protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57129046A true JPS57129046A (en) | 1982-08-10 |
Family
ID=11846809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56013927A Pending JPS57129046A (en) | 1981-02-02 | 1981-02-02 | Frame synchronization protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57129046A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0654814U (en) * | 1993-12-20 | 1994-07-26 | 佐二 萩原 | Gassho framework |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5012857A (en) * | 1973-06-06 | 1975-02-10 | ||
| JPS5399711A (en) * | 1977-02-12 | 1978-08-31 | Fujitsu Ltd | Integrating-type protection circuit |
-
1981
- 1981-02-02 JP JP56013927A patent/JPS57129046A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5012857A (en) * | 1973-06-06 | 1975-02-10 | ||
| JPS5399711A (en) * | 1977-02-12 | 1978-08-31 | Fujitsu Ltd | Integrating-type protection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0654814U (en) * | 1993-12-20 | 1994-07-26 | 佐二 萩原 | Gassho framework |
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