GB965598A - Improvements in communication exchange installations - Google Patents
Improvements in communication exchange installationsInfo
- Publication number
- GB965598A GB965598A GB2244462A GB2244462A GB965598A GB 965598 A GB965598 A GB 965598A GB 2244462 A GB2244462 A GB 2244462A GB 2244462 A GB2244462 A GB 2244462A GB 965598 A GB965598 A GB 965598A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- call
- exchange
- busy
- winding
- 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
- H04Q3/00—Selecting arrangements
- H04Q3/0008—Selecting arrangements using relay selectors in the switching stages
- H04Q3/0012—Selecting arrangements using relay selectors in the switching stages in which the relays are arranged in a matrix configuration
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
965,598. Automatic exchange systems. ALBISWERK ZURICH A.G. June 12, 1962, No. 22444/62. Heading H4K. In a house satellite of which some at least of the subscribers are connected also to a main exchange, a subscriber's private wire is marked with different potentials according as his line is idle, busy in a local house call or busy in an exchange call, and metering is also effected over the same wire. For testing, the marker ZM includes a saturated core transformer IM. The potential at P1 is - 37 V, and in the case of an idle line the c wire is at - 48 V, whereas for a busy line it is at - 33 V or - 24 V. In the idle condition current flowing through winding W1 reverses the magnetic state of the core. When relay Q1, for example, energizes, current in winding W2 switches back the core and produces a pulse in winding W3 to operate relay C1 and an impulse in winding W1 to operate cut-off relay T. In the event of a wanted satellite subscriber being busy, provision is made for camping, and relay NE controlled by transistor Ts1 operates when the line becomes idle. A further test circuit included in the operator's equipment PS determines whether a wanted line is busy in a local call or in an exchange call. The potential at P3 is - 29 V, and relay HG controlled by transistor Ts2 operates in the former case. When a call is initiated, a marker ZM is taken into use, the calling number is determined by relays T1, H1, Z1, E1 and the line is connected to an idle satellite link HVS. The selection digits are stored in a register RG and a marker ZM is reseized to connect HVS to the wanted line. If, however, the first digit indicates an exchange call, HVS is released and the line is connected instead to an exchange link AVS, from which the subscriber receives dialling tone. In the case of an incoming exchange call, the operator keys the number into the register RG and AVS is controlled by a marker ZM. Identification is initiated from the register RG or from the operator's equipment PS by the discharge of capacitor C through winding W1 of a saturated core transformer Vc, thus giving rise to a pulse of +96V on the c wire and operation of the appropriate relays. In the event of an exchange call, metering pulses of - 20 V are applied over the c wire from AVS to operate meter Z. Further circuits are described, Figs. 2 and 3, for enabling the meter Z to respond to metering pulses but not to identification pulses.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH812460A CH383449A (en) | 1960-07-15 | 1960-07-15 | Circuit arrangement for the transmission of several identifiers via a signal wire in telecommunications switching systems with couplers, in particular in telephone private branch exchanges |
Publications (1)
Publication Number | Publication Date |
---|---|
GB965598A true GB965598A (en) | 1964-08-06 |
Family
ID=4335533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2244462A Expired GB965598A (en) | 1960-07-15 | 1962-06-12 | Improvements in communication exchange installations |
Country Status (4)
Country | Link |
---|---|
CH (1) | CH383449A (en) |
DE (1) | DE1138118B (en) |
GB (1) | GB965598A (en) |
NL (1) | NL266072A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3001548C2 (en) * | 1980-01-17 | 1982-11-18 | Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt | Circuit arrangement for the transmission of signals to and from a subscriber station of a telephone private branch exchange |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1011939B (en) * | 1956-08-02 | 1957-07-11 | Allg Telefon Fabrik G M B H | Circuit arrangement for telecommunications systems to reduce the number of lines between the control center and the exchange |
-
0
- NL NL266072D patent/NL266072A/xx unknown
-
1960
- 1960-07-15 CH CH812460A patent/CH383449A/en unknown
-
1961
- 1961-05-08 DE DEA37377A patent/DE1138118B/en active Pending
-
1962
- 1962-06-12 GB GB2244462A patent/GB965598A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL266072A (en) | |
CH383449A (en) | 1964-10-31 |
DE1138118B (en) | 1962-10-18 |
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