JPS6486728A - Protecting method for digital service channel - Google Patents
Protecting method for digital service channelInfo
- Publication number
- JPS6486728A JPS6486728A JP24470287A JP24470287A JPS6486728A JP S6486728 A JPS6486728 A JP S6486728A JP 24470287 A JP24470287 A JP 24470287A JP 24470287 A JP24470287 A JP 24470287A JP S6486728 A JPS6486728 A JP S6486728A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- stand
- current
- dsc
- dsc signal
- 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
Abstract
PURPOSE:To transmit a DSC signal to subordinate stations, by applying an analog signal taken out from a stand-by or current codec to a current or stand-by multiplexing means after converting it to a digital signal again at the time of a failure in detection of frame synchronizing bits of the DSC signal in a current or stand-by codec means. CONSTITUTION:An asynchronous signal sent from a current synchronous detecting circuit 43' by trouble of a current line or break of the DSC signal drives a current switch 31' through an OR gate 71'. Meanwhile, the digital signal inputted from a preceding station through a stand-by line is separated into a main signal and the DSC signal by a stand-by main signal/DSC signal branch part 11 and is separated into respective channels by a stand-by DSC signal branch circuit 41, and a part of this signal is multiplexed by a stand-by DSC signal multiplexing circuit 42 and is transmitted to the subordinate stations. Thus, the DSC signal can be transmitted to the subordinate stations through current and stand-by lines even if the current synchronous detecting circuit cannot detect frame synchronizing bits of the DSC signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24470287A JPH0654900B2 (en) | 1987-09-29 | 1987-09-29 | Digital service channel protection method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24470287A JPH0654900B2 (en) | 1987-09-29 | 1987-09-29 | Digital service channel protection method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6486728A true JPS6486728A (en) | 1989-03-31 |
JPH0654900B2 JPH0654900B2 (en) | 1994-07-20 |
Family
ID=17122657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24470287A Expired - Fee Related JPH0654900B2 (en) | 1987-09-29 | 1987-09-29 | Digital service channel protection method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0654900B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5298875A (en) * | 1991-05-22 | 1994-03-29 | International Business Machines Corporation | Controllable levitation device |
-
1987
- 1987-09-29 JP JP24470287A patent/JPH0654900B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5298875A (en) * | 1991-05-22 | 1994-03-29 | International Business Machines Corporation | Controllable levitation device |
Also Published As
Publication number | Publication date |
---|---|
JPH0654900B2 (en) | 1994-07-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |