GB409026A - Improved switching arrangements for electrical signalling systems - Google Patents
Improved switching arrangements for electrical signalling systemsInfo
- Publication number
- GB409026A GB409026A GB29969/32A GB2996932A GB409026A GB 409026 A GB409026 A GB 409026A GB 29969/32 A GB29969/32 A GB 29969/32A GB 2996932 A GB2996932 A GB 2996932A GB 409026 A GB409026 A GB 409026A
- Authority
- GB
- United Kingdom
- Prior art keywords
- traffic
- switch
- relay
- east
- west
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/18—Automatic changing of the traffic direction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Amplifiers (AREA)
- Radio Relay Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
409,026. Controlling telegraph traffic. ELECTRICAL RESEARCH PRODUCTS, Inc., 195, Broadway, New York, U.S.A.-(Assignees of Burton, E. T. ; 97, Cypress Street, Millburn, New Jersey, U.S.A.) Oct. 26, 1932, No. 29969. Convention date, Dec. 23, 1931. [Class 40 (iii).] Reversing-switches for controlling the direction of simplex cable traffic are operated, at repeater and receiving-terminal stations, by the cessation of traffic. The drawing shows the reversing-switches S1, S2, S3 set for traffic from terminal W through repeater IR to terminal E. The transmitter T at W sends through cable C1, receiving network NWI, amplifiers AI4, AI5, cable C2, receiving network NE, amplifiers AE2, AE3, to receiver R at E. The reversing- switch S3 is held de-energized during the receipt of signals, the grid of valve 301 which controls relay 304 being negativized by A.C. signal-components received through transformer 310 and grid condenser 302. When, however, signals cease to arrive for so long that the grid charge leaks away, relay 304 pulls up, extinguishing the advisory lamp 312, energizing the reversing-switch S3 so as to cut out the receiver at 34 and cut in the transmitter at 33 ; and momentarily energizing relay 320 so as to short-circuit the amplifier AE2 and prevent it from being overloaded by the switching-operation. The time constants are so arranged that the short-circuiting magnet 320 acts before the contacts of switch S3 have been disturbed. At the repeater station IR, cessation of the signals received from W sets switch S2 for east-west instead of west-east traffic. The action is similar to that at the terminal E, but the receiving amplifier AI4 and sending-on amplifier AI5 serve for both directions of traffic. When relay 204 plills up on cessation of traffic, a transient impulse passes via condenser 221 through one or other of the windings of relay 225, according as contact 22 of switch S2 is set for east-west or for west-east traffic : thus the position of the switch is in each case altered from that appropriate to the previous direction of the traffic. The two-winding relay 225 may be replaced by a polarized relay with appropriate connections. The station W at the sending end sends out synchronizing signals in the intervals between messages, and thus holds switches S2, S3, in the position shown until a change of direction is desired. A manual or automatic time switch 106 negativizes the grid of valve 101, de-energizing relay 104, cutting in the warning lamp 112 and allowing switch S1 to reverse, the time constants being such that relay 120 maintains a short-circuit on amplifier AW2 until the switching-operation has been completed. The functions of stations E and Ware thus interchanged, and the next reversal takes place at station E in response to switch 306, and at stations IR, W in response to the cessation of east-west signals. The A.C. signal-components which control the traffic are derived from stages in the amplifying-systems such as AE2, AE3 after the earth-currents have been filtered out, so that these do not affect the control.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US582696A US1904618A (en) | 1931-12-23 | 1931-12-23 | Telegraph system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB409026A true GB409026A (en) | 1934-04-26 |
Family
ID=24330152
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB29969/32A Expired GB409026A (en) | 1931-12-23 | 1932-10-26 | Improved switching arrangements for electrical signalling systems |
Country Status (3)
Country | Link |
---|---|
US (1) | US1904618A (en) |
DE (1) | DE599232C (en) |
GB (1) | GB409026A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2439398A (en) * | 1944-02-25 | 1948-04-13 | Bell Telephone Labor Inc | Telegraph system provided with channel assurance and transmission regulation |
US2554793A (en) * | 1947-06-11 | 1951-05-29 | Teletype Corp | Radio telegraph system with direction control |
-
1931
- 1931-12-23 US US582696A patent/US1904618A/en not_active Expired - Lifetime
-
1932
- 1932-10-26 GB GB29969/32A patent/GB409026A/en not_active Expired
- 1932-11-05 DE DEE43480D patent/DE599232C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US1904618A (en) | 1933-04-18 |
DE599232C (en) | 1934-06-27 |
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