JPS55102952A - Mutual synchronization system - Google Patents
Mutual synchronization systemInfo
- Publication number
- JPS55102952A JPS55102952A JP16498378A JP16498378A JPS55102952A JP S55102952 A JPS55102952 A JP S55102952A JP 16498378 A JP16498378 A JP 16498378A JP 16498378 A JP16498378 A JP 16498378A JP S55102952 A JPS55102952 A JP S55102952A
- Authority
- JP
- Japan
- Prior art keywords
- units
- stand
- frame
- unit
- counters
- 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
Abstract
PURPOSE: To prevent the occurrence of an error at the time of in-use/stand-by alternation by detecting one of doubled multiplexing units in in an in-use state and then by placing a stand-by multiplexing unit in a state where bit synchronization and frame synchronization are possible.
CONSTITUTION: Doubled multiplexing units 10 and 10' are provided with independent high-frequency oscillation source 11 and 11', signals of which are divided by bit counters 12 and 12' to generate reference bit clocks, and frame counters 13 and 13' further divide those clocks to generate frame pulses. Here, in-use/stand-by decision circuits 14 and 14' decide on whether corresponding units 10 and 10' should operate as in in-use or stand-by units, and signal processing circuits 15 and 15' are put into operation. When, unit 10 is in the in-use state, a frame pulse that unit 10 generates is sent to unit 10' to reset counters 12' and 13' and every time they are reset, reference pulses and frame pulses of units 10 and 10' are held in phase.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16498378A JPS55102952A (en) | 1978-12-28 | 1978-12-28 | Mutual synchronization system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16498378A JPS55102952A (en) | 1978-12-28 | 1978-12-28 | Mutual synchronization system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55102952A true JPS55102952A (en) | 1980-08-06 |
Family
ID=15803597
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16498378A Pending JPS55102952A (en) | 1978-12-28 | 1978-12-28 | Mutual synchronization system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55102952A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60204138A (en) * | 1984-03-29 | 1985-10-15 | Nec Corp | Spare set switching system |
JPS62289024A (en) * | 1986-06-06 | 1987-12-15 | Nec Corp | Data communication equipment |
US6256291B1 (en) | 1967-04-27 | 2001-07-03 | Fujitsu Limited | Method of switching between redundant routes in communication system devoid of redundant transmission |
-
1978
- 1978-12-28 JP JP16498378A patent/JPS55102952A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6256291B1 (en) | 1967-04-27 | 2001-07-03 | Fujitsu Limited | Method of switching between redundant routes in communication system devoid of redundant transmission |
JPS60204138A (en) * | 1984-03-29 | 1985-10-15 | Nec Corp | Spare set switching system |
JPH0431210B2 (en) * | 1984-03-29 | 1992-05-25 | ||
JPS62289024A (en) * | 1986-06-06 | 1987-12-15 | Nec Corp | Data communication equipment |
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