GB563666A - Improvements in or relating to automatic or semi-automatic telephone or like exchange systems - Google Patents
Improvements in or relating to automatic or semi-automatic telephone or like exchange systemsInfo
- Publication number
- GB563666A GB563666A GB398643A GB398643A GB563666A GB 563666 A GB563666 A GB 563666A GB 398643 A GB398643 A GB 398643A GB 398643 A GB398643 A GB 398643A GB 563666 A GB563666 A GB 563666A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- line
- register
- group
- tens
- 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
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
563,666. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd. (International' Standard Electric Corporation). March 11, 1943, No. 3986. [Class 40 (iv)] In a register-controller system, the method described in Specification 555,530 for the control of single-motion group selectors by the comparison of A.C. revertive signals with a selected reference current is adapted for the control of final selectors. The arrangement provides for hunting over P.B.X. groups. As the final selector, Fig. 3, passes over subnormal positions at the beginning of the successive tens groups, A.C. signals of different phase are sent over wire c to the register-controller, Figs. 1, 2, and are compared with a reference current selected by the tens register SMT. The driving circuit is opened by relay Vtr when agreement is reached and outsequence switch OM is advanced to connect up the units register SMU. If the first line of the group is required, the selector does not move, since the first position of SMU is wired back to the tens register SMT and relay Vtr immediately re-operates. Otherwise the selector advances over the group and again sends back signals of different phase for comparison with the current selected by SMU until fresh agreement causes Vtr to reoperate, these signals being of different voltage from the previous signals. Relay Vhr energizes and makes a test circuit over resistance K, relay Pbr, b wire, relay Br, wiper c, in which relay Pbr operates if the selected line is idle and connects up Sfr. The latter connects Sor in parallel with Pbr to permit the operation of switching relay Br in the final selector and grounds terminal F to bring about the completion of the connection. If the line is busy, Pbr is inoperative and relay Gbr, which follows Vhr, connects up Pcr, Sbr to ground terminal B. The first and last lines of a P.B.X. group are marked by battery through resistance R, Fig. 4. If the first line is found to be busy, relay Pcr short-circuits resistance K and Pbr then operates in series with resistance R and connects up Psr. The operation of relay Vrr releases Vtr, and the relapse of Vhr steps the units register SMU to select the reference current for the next line of the P.B.X. group, whereupon the relapse of Vrr drives the final selector to that line. If it is found busy, Gbr, Pcr pull up and reoperate Vrr to continue hunting. If the last line is busy, Pbr operates after Pcr, as when the first line is busy, and Pfr is connected up to ground terminal B. Relays Shr, Msr provide for the proper advance of the tens and units registers SMT, SMU when a P.B.X. group is contained in more than one tens group. An intermediate line (but not the last line) of a P.B.X. group may be called individually in the same way as an ordinary line. Modifications.-The tens and units controls may be effected simultaneously over separate circuits, Fig. 8 (not shown), relay Vtr being dependent on two comparison circuits. In another arrangement, Fig. 5 (not shown), the final selector as it passes over subnormal positions sends back A.C. impulses to step a counting switch until the latter reaches a position marked by the tens register SMT. In a modified arrangement for P.B.X. hunting, Figs. 6, 7 (not shown), the A.C. signals of different phase have also different frequencies (or different potentials) according as they are ordinary lines or first or last lines of P.B.X. groups. Three comparison circuits in the register-controller control individual relays Vbr to produce the various effects described above in relation to Figs. 1, 2.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR882420D FR882420A (en) | 1941-06-10 | ||
NL58220D NL58220C (en) | 1943-03-11 | ||
NL55949D NL55949C (en) | 1943-03-11 | ||
US472624A US2454809A (en) | 1941-06-10 | 1943-01-16 | Telephone system utilizing register controlled final selector switches |
GB398643A GB563666A (en) | 1943-03-11 | 1943-03-11 | Improvements in or relating to automatic or semi-automatic telephone or like exchange systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB398643A GB563666A (en) | 1943-03-11 | 1943-03-11 | Improvements in or relating to automatic or semi-automatic telephone or like exchange systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB563666A true GB563666A (en) | 1944-08-24 |
Family
ID=9768638
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB398643A Expired GB563666A (en) | 1941-06-10 | 1943-03-11 | Improvements in or relating to automatic or semi-automatic telephone or like exchange systems |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB563666A (en) |
NL (2) | NL55949C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR882420A (en) * | 1941-06-10 | 1943-06-18 |
-
0
- NL NL58220D patent/NL58220C/xx active
- NL NL55949D patent/NL55949C/xx active
-
1943
- 1943-03-11 GB GB398643A patent/GB563666A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL55949C (en) | |
NL58220C (en) |
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