GB1153214A - Automatic Telephone System - Google Patents
Automatic Telephone SystemInfo
- Publication number
- GB1153214A GB1153214A GB862667A GB862667A GB1153214A GB 1153214 A GB1153214 A GB 1153214A GB 862667 A GB862667 A GB 862667A GB 862667 A GB862667 A GB 862667A GB 1153214 A GB1153214 A GB 1153214A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- line circuit
- winding
- current
- busy
- 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)
- Interface Circuits In Exchanges (AREA)
Abstract
1,153,214. Automatic exchange systems. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 23 Feb., 1967 [26 Feb., 1966], No. 8626/67. Heading H4K. A test position CM can obtain a connection to a line circuit LS in a manner such as not to operate the busy relay S at the line circuit, a calling condition simulated in the line circuit by means of a signal from the test position causing the exchange marker to connect the line circuit to a register in response to which connection the busy relay S operates. Line supervision is effected by interrogation of a magnetic core O in the line circuit; loop current in windings W 1 , W 2 , switching the core against normal bias in winding W 5 , and interrogation pulses to winding W 6 producing output in winding W 4 if the core is so switched. When a connection is made to the line circuit over the relay crosspoint switching network, operating current is normally supplied over marker contacts m 11 so that when the A stage crosspoint operates to 36 volts negative the S relay also operates in the line circuit, holding current in the path c-wire driving a winding W 3 on the line circuit core O. Thus the busy relay S disconnects the windings W 1 , W 2 , but with holding current in W 3 preserves output at W 4 to scanner interrogations on W 6 . If the test position CM wants a connection with LS it signals the marker over contacts cm 3 where discriminator K 0 conditions the marker to operate the path over the network with 46 volts negative from contacts m 12 so that potential across busy relay S is insufficient to operate S. Holding current over the c-wire, however, by switching core O in winding W 3 busies the line circuit to the scanner as is normal for a call termination. To remove this busy record 24 volts is connected to the b-wire from contacts cm 2 of CM, the resulting current in winding W 2 neutralizing the effect of holding current in W 3 . The core O is, therefore, switched by the first interrogation and found idle on subsequent interrogations. To establish a calling condition from LS the test station takes down its handset from TCM and consequent current in W 1 , W 2 , reswitches the core O. When the marker responds by connecting a register, the relay S operates in the normal manner and the set TCM can be employed to establish a connection from LS. A modified line circuit is shown in Fig. 2 where an additional core N enables the busy condition to be maintained to the scanner when the line circuit is released on the network side but the associated subscriber stays off-hook. Loop current is taken through a winding U 5 on core N but does not switch the core. Calling condition is signalled by output from W 4 to interrogation on W 6 ; interrogation of U 2 producing no output from U 4 . A connection to the network switches N with holding current on the c-wire through U 1 , the scanning circuits being such that coincidence of output from W 4 and U 4 results in switching pulses from the scanner to U 2 . When a connection has been set up from station CM the busy condition is removed by application of 24 volts to the bwire to neutralize holding current flux in cores O and N. Rectifier GLS removes loop resistor R 2 in this circuit. Loss of interrogation output from W 4 and U 4 clears down the recorded busy condition. A calling condition is then set up by earthing the a-wire over the network from contacts cm 4 so that core O switches to current in W 1 but core N remains unswitched.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6602551A NL6602551A (en) | 1966-02-26 | 1966-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1153214A true GB1153214A (en) | 1969-05-29 |
Family
ID=19795857
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB862667A Expired GB1153214A (en) | 1966-02-26 | 1967-02-23 | Automatic Telephone System |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE694638A (en) |
DE (1) | DE1512881A1 (en) |
FR (1) | FR1512746A (en) |
GB (1) | GB1153214A (en) |
NL (1) | NL6602551A (en) |
SE (1) | SE300455B (en) |
-
1966
- 1966-02-26 NL NL6602551A patent/NL6602551A/xx unknown
-
1967
- 1967-02-22 DE DE19671512881 patent/DE1512881A1/en active Pending
- 1967-02-23 GB GB862667A patent/GB1153214A/en not_active Expired
- 1967-02-23 SE SE250767A patent/SE300455B/xx unknown
- 1967-02-24 BE BE694638D patent/BE694638A/xx unknown
- 1967-02-27 FR FR96560A patent/FR1512746A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE694638A (en) | 1967-08-24 |
SE300455B (en) | 1968-04-29 |
FR1512746A (en) | 1968-02-09 |
DE1512881A1 (en) | 1969-05-22 |
NL6602551A (en) | 1967-08-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |