Plessey - Revision history

Signal-in-the-box at 00:28, 13 July 2016

2016-07-13T00:28:25Z

Larryc39: Replaced content with "For the article on Plessey, see Automatic Telephone and Electric Co. Ltd."

2015-10-29T18:44:08Z

Replaced content with "For the article on Plessey, see Automatic Telephone and Electric Co. Ltd."

Show changes

Larryc39: /* Controller Types */

2015-10-29T18:42:26Z

‎Controller Types

Larryc39: /* Controllers */

2015-10-29T18:41:57Z

‎Controllers

Larryc39: /* Hardware */

2015-10-29T18:41:15Z

‎Hardware

Larryc39: /* Controllers */

2015-10-29T18:40:44Z

‎Controllers

Larryc39: /* Controllers */

2015-10-29T18:39:30Z

‎Controllers

Larryc39: /* References */

2015-10-29T18:38:19Z

‎References

Larryc39: /* References */

2015-10-29T18:38:03Z

‎References

Larryc39: /* Plessey Takeover */

2015-10-29T18:36:29Z

‎Plessey Takeover

← Older revision		Revision as of 00:28, 13 July 2016
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	For the article on Plessey, see [[Automatic_Telephone_and_Electric_Co._Ltd._(ATM)\|Automatic Telephone and Electric Co. Ltd.]]		For the article on Plessey, see [[Automatic_Telephone_and_Electric_Co._Ltd._(ATM)\|Automatic Telephone and Electric Co. Ltd.]]

← Older revision		Revision as of 18:42, 29 October 2015
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	===Controller Types===		===Controller Types===
		+	====XL9 Computer====
		+	In the 1960’s(?) the commercially-available XL9 computer was developed by subsidiary Plessey Radar (much of the products being designed here being secret or government level product only.) This was used in at least one instance, in Liverpool, to provide city-level traffic light coordination.

	===Detectors===		===Detectors===

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 Bias Linking was the newest system introduced in the 1950’s to allow the flexible progressive system to return some local control to each intersection.  In this setup, each intersection has its own local controller and detector/demand based rule set to control cycle lengths and priority.  All intersections along a route are interconnected to a master controller which regulates the strict phase changes.  Where the bias comes in is where one intersection notices that its current right-of-way is not being utilized, the local controller can choose to accept a detector input, or bias, for an out of phase arterial street before reverting back to the phase change sequence demanded by the master.  Bias Linking also allowed the detector inputs to be ignored, with the right-of-way phase placed in a hold period.  Three separate plans could be stored and used in the interconnected system.  In the event of a local controller losing sync with the master, an alarm was raised at the master station and the local controller would function independently in isolation. <br><br>
 A pedestrian push-button system was offered on the controllers, essentially tying a pushbutton into the actuation system and allocating pedestrians their own phase(s) of traffic along with a WAIT/CROSS NOW signal. <br><br>
 ===Controller Types===

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 == Hardware ==
 <div style="overflow: hidden">
-''This would include any kind of special options for traffic signals as well as mounting hardware including brackets, slipfitters, hangers, bases, etc. ''
+===Ped Buttons===
 </div>

@@ Line 112: / Line 112: @@
 Bias Linking was the newest system introduced in the 1950’s to allow the flexible progressive system to return some local control to each intersection.  In this setup, each intersection has its own local controller and detector/demand based rule set to control cycle lengths and priority.  All intersections along a route are interconnected to a master controller which regulates the strict phase changes.  Where the bias comes in is where one intersection notices that its current right-of-way is not being utilized, the local controller can choose to accept a detector input, or bias, for an out of phase arterial street before reverting back to the phase change sequence demanded by the master.  Bias Linking also allowed the detector inputs to be ignored, with the right-of-way phase placed in a hold period.  Three separate plans could be stored and used in the interconnected system.  In the event of a local controller losing sync with the master, an alarm was raised at the master station and the local controller would function independently in isolation. <br><br>
 A pedestrian push-button system was offered on the controllers, essentially tying a pushbutton into the actuation system and allocating pedestrians their own phase(s) of traffic along with a WAIT/CROSS NOW signal. <br><br>
 </div>

@@ Line 106: / Line 106: @@
 == Controllers ==
 <div style="overflow: hidden">
-''Different type of controllers ''
+March, 1932 – Cornhill, Bishopsgate, Gracechurch, and Leadenhall, London.  First European Electro-Matic intersection is put into service.  The cabinet was placed on the northeast corner of Cornhill at Bishopsgate.  While the controller is long gone the Victorian era building behind it remains, now a Sainsbury Local.<br><br>
 </div>

@@ Line 126: / Line 126: @@
 == References ==
 <div style="overflow: hidden">
-http://www.gracesguide.co.uk/Automatic_Telephone_and_Electric_Co
+http://www.gracesguide.co.uk/Automatic_Telephone_and_Electric_Co<br><br>
-http://www.gracesguide.co.uk/Automatic_Telephone_Manufacturing_Co
+http://www.gracesguide.co.uk/Automatic_Telephone_Manufacturing_Co<br><br>
 “Electro-Matic” Vehicle-Actuated Road Signals, Publication No. 1147, Automatic Telephone & Electric Co. Ltd., 1957

@@ Line 8: / Line 8: @@
 In November of 1911, British Insulated Cables created a business entity known as the Automatic Telephone Manufacturing Co. of Edge Lane, Liverpool to produce automatic telephone exchanges and related equipment.  It will be noted that in 1932, now a subsidiary of International Automatic Telephone Co., Automatic Telephone Manufacturing Company changed their name to Automatic Electric Co.  In 1936, they were absorbed back into the parent corporation, adopting the merged name Automatic Telephone and Electric Co. Ltd.
 ===Plessey Takeover===
-Founded 12th December 1917, Plessey Co. of Marylebone, London was created to produce small mechanical bits and bobs.  They would shift into electronics contract manufacture in the 1920’s before dissolving and reforming themselves as the Plessey Co. on 15th February 1925.
+Founded 12th December 1917, Plessey Co. of Marylebone, London was created to produce small mechanical bits and bobs.  They would shift into electronics contract manufacture in the 1920’s before dissolving and reforming themselves as the Plessey Co. on 15th February 1925.<br><br>
 In 1960 Automatic Telephone and Electric Co. joined in a consortium with Plessey Co. with five other companies to form a holding company, Combined Telephone Holdings, in an unsuccessful attempt to acquire one of the smallest telephone players, Telephone Manufacturing Co., and later in a successful attempt to acquire another of the smallest, Phoenix Telephone and Electric Works.
 Continuing on the trend from 1960, and an eye towards expansion, Plessey ended manufacture of some commercial electronics and focused on shifting from a component manufacturer to a systems provider.  Acquisitions of Automatic Telephone and Electric Co. and Ericsson Telephones Ltd. doubled corporate size and made them Britain’s largest telco manufacturer.  In 1965 these three would be fully combined, furthermore known as Plessey Telecommunications.  Traffic signals would now be only a minor business concern of Plessey, having scores of subsidiary companies and tens of thousands of workers.  Later years would see the designs updated one last time before they lost out to more upstart manufacturers such as Mellor and in later years Siemens and PEEK.
 ===Distributors and Contract Manufacturing ===