GB1501596A - Call discriminator and method of call discrimination - Google Patents
Call discriminator and method of call discriminationInfo
- Publication number
- GB1501596A GB1501596A GB19086/76A GB1908676A GB1501596A GB 1501596 A GB1501596 A GB 1501596A GB 19086/76 A GB19086/76 A GB 19086/76A GB 1908676 A GB1908676 A GB 1908676A GB 1501596 A GB1501596 A GB 1501596A
- Authority
- GB
- United Kingdom
- Prior art keywords
- register
- digits
- switch
- input
- call
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
1501596 Automatic exchange systems COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL 10 May 1976 [13 May 1975] 19086/76 Heading H4K A call discriminator comprises a first input for receiving dialled digits from an exchange register, a second input for receiving class of service (COS) of an exchange inlet and/or outlet, a first analyser for receiving a predetermined number of the initial digits from the first input to determine the number of digits necessary for complete analysis of a call, a switch connected to the first input and controlled by the first analyser to select digits for further analysis and to route them to a second analyser and a comparator for comparing the COS from the second input with an output of the second analyser to produce a barring signal when a prohibited call is requested. In the embodiment, Fig. 1, the dialled digits are received in the discriminator by amplifiers and decoders AD from an exchange register. The first two dialled digits, routed through switch GA and decoder CBI are used to address a memory M 1 together with an input NE which indicates if the call is internal or external. Each word of memory M 1 is split into three parts: Z 1 , code controlling switch GA, Z2, code for COS and Z3, code for the number of digits to be analysed. The outputs of Z1 and Z2 are connected to a register RG1 and the outputs of Z3 are connected to a comparator CC which also receives the position of the last digit dialled through inputs NC and gives an output which clocks Register RG 1 through gate P2 which is also connected to an input T2, enabled at a time t2. Register RG 1 is reset to zero at a time t1 through T 1. The outputs of register RG 1 control switch GA and a second analyser which analyses three dialled digits as described below. The three digits, not necessarily the first three, are chosen by switch GA activated by a control signal from register RG 1 and are used to address a memory M2 which stores codes corresponding to geographic areas or for internal calls corresponding to the kind of service required. Each word is divided into two parts, one for internal and one for external calls. The selection of the half word to be used is effected by switch AI1, controlled by register RG1. The outputs of switch All are temporarily stored in a register RG2. The COS and barred access codes are received on inputs CA, IN respectively through switch AI2 and are used together with some outputs of register RG1 to address a memory M3 which has two parts the first containing data to be compared with that of memory M2 i.e. kinds of calls allowed and the second code numbers of various firms connected to the exchange. The outputs of memory M3 are compared with the data stored in register RG2 through a comparator comprising gates PE1-8 and P8 whose output A indicates if a call is to be allowed or barred. In the case where a leased (tie) line is used a further comparison is made, before the comparison described above, to determine whether the subscriber asking for the leased line belongs to the firm leasing the line.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7514831A FR2311461A1 (en) | 1975-05-13 | 1975-05-13 | DISCRIMINATION PROCESS AND DISCRIMINATOR NUMBERING DEVICE |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1501596A true GB1501596A (en) | 1978-02-15 |
Family
ID=9155146
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19086/76A Expired GB1501596A (en) | 1975-05-13 | 1976-05-10 | Call discriminator and method of call discrimination |
Country Status (8)
Country | Link |
---|---|
BE (1) | BE841322A (en) |
DE (1) | DE2620066A1 (en) |
FR (1) | FR2311461A1 (en) |
GB (1) | GB1501596A (en) |
IE (1) | IE42685B1 (en) |
IT (1) | IT1074160B (en) |
NL (1) | NL7605140A (en) |
SE (1) | SE7605351L (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1989011768A1 (en) * | 1988-05-16 | 1989-11-30 | Australian Telecommunications Corporation | Class marking apparatus for use in telephone exchanges |
-
1975
- 1975-05-13 FR FR7514831A patent/FR2311461A1/en not_active Withdrawn
-
1976
- 1976-04-30 BE BE1007354A patent/BE841322A/en unknown
- 1976-05-06 DE DE19762620066 patent/DE2620066A1/en not_active Withdrawn
- 1976-05-10 GB GB19086/76A patent/GB1501596A/en not_active Expired
- 1976-05-11 SE SE7605351A patent/SE7605351L/en unknown
- 1976-05-12 IE IE1009/76A patent/IE42685B1/en unknown
- 1976-05-12 IT IT23177/76A patent/IT1074160B/en active
- 1976-05-13 NL NL7605140A patent/NL7605140A/en not_active Application Discontinuation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1989011768A1 (en) * | 1988-05-16 | 1989-11-30 | Australian Telecommunications Corporation | Class marking apparatus for use in telephone exchanges |
Also Published As
Publication number | Publication date |
---|---|
BE841322A (en) | 1976-11-03 |
NL7605140A (en) | 1976-11-16 |
IT1074160B (en) | 1985-04-17 |
IE42685B1 (en) | 1980-09-24 |
SE7605351L (en) | 1976-11-14 |
DE2620066A1 (en) | 1976-12-02 |
FR2311461A1 (en) | 1976-12-10 |
IE42685L (en) | 1976-11-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |