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CMS:Number One Crossbar Switch: Difference between revisions

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== Installation and Service Life ==
== Installation and Service Life ==
The Vermont 1XB was originally cut over on March 1 1942. Over 100 Western Electric workers worked to build the switch, which replaced the Vermont/Kenwood manual office that had served the residential neighborhoods around the University of Washington up to that point. <nowiki>[[citation needed]]</nowiki>
The Vermont 1XB was originally cut over on March 1 1942. Over 100 Western Electric workers worked to build the switch, which replaced the Vermont/Kenwood manual office that had served the residential neighborhoods around the University of Washington up to that point. {{citation needed}}


Initially cut over with 15,908 stations, it grew over its lifetime as the number of subscribers in the neighborhood increased. A point of interest for the museum is that our founder, [[CMS:Herb H. Warrick, Jr.|Herb H. Warrick, Jr.]] was a switchman in this office in its early years.
Initially cut over with 15,908 stations, it grew over its lifetime as the number of subscribers in the neighborhood increased. A point of interest for the museum is that our founder, [[CMS:Herb H. Warrick, Jr.|Herb H. Warrick, Jr.]] was a switchman in this office in its early years.
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In 2016 volunteers Sarah Autumn and æstrid Smith learned that some No. 1 Crossbar equipment was available from collector [[Jim Day]] in [[Jim's warehouse|his warehouse]] in West Haven, CT. This equipment had been salvaged from the Coney Island 6 exchange on Avenue U in Brooklyn, NY. Sarah and æstrid traveled to West Haven and retrieved two SD-25013-01 Full Selector terminating senders, and one SD-25012-01 subscriber's sender, which were driven back to Seattle in a minivan. Volunteers Les Anderson, Colin Slater, æstrid Smith and Sarah Autumn installed the terminating senders in 2017, and made the [https://www.youtube.com/watch?v=3WcrVZsbz6M first phone call to the 1XB from the Panel] in the same year. In the following years, three more terminating senders, and two more subscriber senders were brought back from Jim Day's warehouse to Seattle and installed in the machine.
In 2016 volunteers Sarah Autumn and æstrid Smith learned that some No. 1 Crossbar equipment was available from collector [[Jim Day]] in [[Jim's warehouse|his warehouse]] in West Haven, CT. This equipment had been salvaged from the Coney Island 6 exchange on Avenue U in Brooklyn, NY. Sarah and æstrid traveled to West Haven and retrieved two SD-25013-01 Full Selector terminating senders, and one SD-25012-01 subscriber's sender, which were driven back to Seattle in a minivan. Volunteers Les Anderson, Colin Slater, æstrid Smith and Sarah Autumn installed the terminating senders in 2017, and made the [https://www.youtube.com/watch?v=3WcrVZsbz6M first phone call to the 1XB from the Panel] in the same year. In the following years, three more terminating senders, and two more subscriber senders were brought back from Jim Day's warehouse to Seattle and installed in the machine.


In 2019-2021 the switch underwent major rewiring and upgrades. This work was performed entirely by Sarah Autumn, much of it during the 2020 COVID-19 pandemic. These upgrades were a major overhaul that required taking the switch out of service for a long period of time. Effectively rebuilding the entire machine's topology from scratch, this work increased the call capacity of the 1XB to its theoretical maximum, and fully integrated it with the other switches in the museum, and with our Asterisk box ''[[CMS:Kercheep|kercheep]]'', and the [[CMS:Call simulator|call simulator]].
In 2019-2021 the switch underwent major rewiring and upgrades. This work was performed entirely by Sarah Autumn, much of it during the 2020 COVID-19 pandemic. These upgrades were a major overhaul that required taking the switch out of service for a long period of time. Effectively rebuilding the entire machine's topology from scratch, this work increased the call capacity of the 1XB to its theoretical maximum, and fully integrated it with the other switches in the museum, and with our Asterisk box ''[[CMS:Kercheep|kercheep]]'', and the [[CMS:Panel gen|call simulator]].


== Notable Equipment ==
== Notable Equipment ==
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* 10- and 100-line concentrating frames
* 10- and 100-line concentrating frames
* Line Insulation Test frame
* Line Insulation Test frame
* ANI frames
* [[ANI]] frames
* Both old and new-style subscriber's senders
* Both old and new-style [[subscriber's senders]]
* Recorded Announcement frame from a Crossbar Tandem
* Recorded Announcement frame from a Crossbar Tandem
* Kercheep, the computer, and various digital and carrier equipment
* [[CMS:Kercheep|Kercheep]], the computer, and various digital and carrier equipment


== Trunks In and Out ==
== Trunking ==
The 1XB has a complex trunking pattern that includes both first-choice and alternate routes. It also decides on call routing via class of service based on which sender is serving your call. This pattern is possibly the most complex and diverse of any of the museum's switches. Trunks include, but are not limited to:
The 1XB has a complex trunking pattern that includes both first-choice and alternate routes. It also decides on call routing via class of service based on which sender is serving your call. This pattern is possibly the most complex and diverse of any of the museum's switches. Trunks include, but are not limited to:


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* to [[CMS:Kercheep|Kercheep]], with ANI/CAMA (537)
* to [[CMS:Kercheep|Kercheep]], with ANI/CAMA (537)
* to the [[CMS:3ESS (Electronic Switching System)|3ESS]] (830)
* to the [[CMS:3ESS (Electronic Switching System)|3ESS]] (830)
* to the [[CMS:DMS-10|DMS-10]] via [[CMS:Kercheep|kercheep]]


== Technical Information ==
== Technical Information ==
[todo]
The configuration of the No. 1 Crossbar at the museum is minimal, when compared to its active service life. The switch has one of the following of each frame:
 
Aisle 4
 
* Line Link Frame (LLF)
* Subscriber Sender Link (SSL)
* District Junctor (DJ) - containing 100 junctors
* District Link (DL)
* Office Link (OL)
* Incoming Trunk Test Connector
* Incoming Link (IL)
* Incoming Trunk (100 trunks)
* Terminating Sender Link (TSL)
* Number Group Connector (NGC)
* Line Junctor Connector (LJC)
* Terminating Sender Frame (3 MF, 2 FS term senders, total of 5)
* Sender Selector equipment
* Recorded announcement frame
 
Aisle 3
 
* Line Distributing Frame (LDF)
* Originating Marker (OM)
* Originating Marker Connector (OMC)
* Subscriber Sender (2x SD-27810-01, 3x SD-25012-01, total of 5 senders)
* Misc RR
* Office Junctor Grouping Frame (OJGF)
* ANI Trouble Ticketer
* Block Relay Frame (BRF 0)
* ANI Number Network Primary (ANI NN)
* ANI Trunk Frame (ANI T)
* ANI Outpulser (ANI OP)
* ANI Identifier
* Service Observing Equipment (SOJ)
* Terminating Marker
* Terminating Marker Connector
* 100 Line Concentrator
 
Aisle 2
 
* 10 Line Concentrator
* Line Insulation Test (LIT)
* MF Current Supply (MFCS)
* Permanent Signal Holding Trunks
* Originating Sender Test Relay Rack
* Office Interrupter (OI)
* Floor Alarm (FLA 100)
* Emergency Alarm
* CARW Equipment (2 bays)
* Intercepting and Announcement equipment
* Call Data Transmitter (CDT)
* Billing Data Transmitter (BDT)
* Tandem Crossbar Ring Marker
Aisle 1 (Test Aisle)
 
* ANI Identifier-Outpulse and Trunk Test Frame (ANI TST)
* Incoming Trunk Test Frame (ITT)
* Terminating Sender Test Frame (TST)
* Terminating Trouble Indicator (TTI)
* Originating Trouble Indicator (OTI)
* Outgoing Trunk Test Frame (OGT)
* Outgoing Trunk Test jack panel (OGT JK)
* Sender Make Busy Frame (SMB)
* Originating Sender Test Frame (OST)
* District Junctor Test Frame (DJ TST)
 
[[Category:Connections Museum Exhibits]]
[[Category:Connections Museum Exhibits]]
Retrieved from "https://wiki.connections.museum/w/CMS:Number_One_Crossbar_Switch"