GB724852A - Improvements in or relating to party line telephone systems - Google Patents
Improvements in or relating to party line telephone systemsInfo
- Publication number
- GB724852A GB724852A GB12120/53A GB1212053A GB724852A GB 724852 A GB724852 A GB 724852A GB 12120/53 A GB12120/53 A GB 12120/53A GB 1212053 A GB1212053 A GB 1212053A GB 724852 A GB724852 A GB 724852A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- call
- terminals
- private
- party
- 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
- H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
724,852. Party line systems. WESTERN ELECTRIC CO., Inc. May 1, 1953 [May 3, 1952], No, 12120/63. Class 40 (4). The subscribers connected to a party line are provided with an additional private communication channel to which a calling or called subscriber is automatically transferred if the channel is idle, or if it becomes idle during the course of the call. The private channel may be a separate line as shown, or a carrier channel on the party line in the range 10-20 kc. A single private line may be provided for two party lines. In Fig. 1, transfer from the party line 13 to the private line 12 is effected by a slow-release polarized relay 23 located near the subscriber's set. The lines 12, 13 are normally connected at the exchange to switch terminals 27, 28. Assuming that the private line 12 is idle and that subscriber 10 calls or is called over line 13, relay 29 energizes followed by W which (1) connects line 12 to terminals 28 and (2) reverses the current in line 13 to operate transfer relay 23. The current in line 12 holds 23 and operates 30 which shunts out 29 and allows Z to pull up while W remains held. The party line 13 is thus switched to terminals 27 and its connections are such that a second calling or called subscriber remains on that line. But if the call on the private line 12 ends first, the relapse of 30 allows 29 to reoperate and shunt out W, whereupon the second call is transferred to line 12. The second operation of 30 releases Z and restores the line connections to normal. Should the exchange seize line 13 over terminals 27 while there is a call on line 12 over terminals 28, W and Z are held over sleeve 42 in case the existing call is released before the called subscriber in the new call replies. In the case of a revertive call, if the group is idle the caller is at once transferred to line 12 and gets a finder over terminals 28. He dials appropriate digits, and the connector finding terminals 28 busy seizes line 13 over terminals 27 and rings. Upon reply, the line current is reversed in the connector and the called subscriber is transferred to line 12, the call being held by the finder. If an existing call on line 12, terminals 28 is released while the revertive caller is dialling, he is transferred to line 12, terminals 27. The connector therefore seizes line 13 over terminals 28 and rings, the called subscriber being transferred to line 12 upon reply as before. If the connector finds both lines busy on account of a second call in the group, the revertive call can be set up by standard revertive procedure, both subscribers being run when the caller hangs up subscribers being rung when the caller hangs up after hearing busy tone. But if the revertive caller is using the private line, when he hangs up the existing call on the party line is transferred to the private line, and the revertive call is set up on the party line. In a modification, Fig. 2 (not shown), the transfer relay 23 is provided with a holding winding which becomes bridged across the private line 12. It is released by the opening of line 12 by means of a pair of relays (replacing 30) which operate and restore in succession. The line reversing contacts may be controlled directly by relays 29, 30. It is suggested that a community of 250 subscribers might be accommodated on a 100-line exchange having 50 individual lines and 25 two-line groups of the kind described each serving 8 subscribers with selective ringing.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US724852XA | 1952-05-03 | 1952-05-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB724852A true GB724852A (en) | 1955-02-23 |
Family
ID=22107896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12120/53A Expired GB724852A (en) | 1952-05-03 | 1953-05-01 | Improvements in or relating to party line telephone systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB724852A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2425223A (en) * | 2005-03-18 | 2006-10-18 | United Technologists Europe Ltd | Switching apparatus for connection to a five point overvoltage protection socket in an exchange |
-
1953
- 1953-05-01 GB GB12120/53A patent/GB724852A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2425223A (en) * | 2005-03-18 | 2006-10-18 | United Technologists Europe Ltd | Switching apparatus for connection to a five point overvoltage protection socket in an exchange |
GB2425223B (en) * | 2005-03-18 | 2009-03-04 | United Technologists Europe Ltd | Service transfer switch |
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