GB696913A - Improvements in or relating to signalling arrangements for multi-channel carrier communication systems - Google Patents
Improvements in or relating to signalling arrangements for multi-channel carrier communication systemsInfo
- Publication number
- GB696913A GB696913A GB265551A GB265551A GB696913A GB 696913 A GB696913 A GB 696913A GB 265551 A GB265551 A GB 265551A GB 265551 A GB265551 A GB 265551A GB 696913 A GB696913 A GB 696913A
- Authority
- GB
- United Kingdom
- Prior art keywords
- connection
- signalling
- connections
- channel
- transmitted
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/16—Monitoring arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Abstract
696,913. Two-way transmission; carrier transmission. STANDARD TELEPHONES & CABLES, Ltd. Feb. 1, 1952 [Feb. 2, 1951], No. 2655/51. Class 40 (iv). In a multi-channel telephone network comprising a multiplex system or a group of audio channels, two-way connections between two stations are grouped in pairs and supervisory signals in one direction for both connections of a pair are transmitted over one connection and supervisory signals in the reverse direction for both connections are transmitted over the other connection. In the two-wire system, Fig. 2, both-way connections 1 and 2 over pairs 4, 6 and 5, 7 respectively have a carrier channel bandwidth of 3400 cs. and the band above 2800 cs. is used for the supervisory signals which comprise a 2940 cycle signal for connection 1, a 3180 cycle signal for connection 2 and a pilot current of frequency 3060 cycles. The signal carrier generator, Fig. 4 (not shown), comprises a 3060 cycle oscillator and a 120 cycle oscillator feeding a modulator from which the signalling frequencies are derived by filters for keying by, for example, dialling impulses in static modulators. The receiver, Fig. 5, includes an amplifier 49 provided with automatic gain control by rectified pilot current and two relay circuits in which a relay is included in the anode circuit of a valve which is also biased by the rectifier pilot current through rectifier 55. The valves are also provided with additional bias to obtain freedom from distortion by making the anode current half its maximum when the signalling wave passes through zero. Cross talk and false operation are avoided by having the signalling frequency for the channel over which it is being transmitted adjacent to the audio channel. This arrangement also facilitates a more economical filter. In a 4-wire system, Fig. 3 (not shown), the signalling is transmitted by the " Go " line of one connection and the return line of the other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB265551A GB696913A (en) | 1951-02-02 | 1951-02-02 | Improvements in or relating to signalling arrangements for multi-channel carrier communication systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB265551A GB696913A (en) | 1951-02-02 | 1951-02-02 | Improvements in or relating to signalling arrangements for multi-channel carrier communication systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB696913A true GB696913A (en) | 1953-09-09 |
Family
ID=9743406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB265551A Expired GB696913A (en) | 1951-02-02 | 1951-02-02 | Improvements in or relating to signalling arrangements for multi-channel carrier communication systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB696913A (en) |
-
1951
- 1951-02-02 GB GB265551A patent/GB696913A/en not_active Expired
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