CMS:Number One Crossbar Switch: Difference between revisions
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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: | 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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== Technical Information == | == Technical Information == | ||
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 1 | |||
* Line Link Frame (LLF) | |||
* Subscriber Sender Link (SSL) | |||
* District Junctor (DJ) - containing 100 junctors | |||
* District Link (DL) | |||
* Office Link (OL) | |||
* 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 | |||
Aisle 2 | |||
* 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 (ANIT) | |||
* ANI Outpulser (ANI OP) | |||
* ANI Identifier | |||
* Service Observing Equipment (SOJ) | |||
* Terminating Marker | |||
* Terminating Marker Connector | |||
Aisle 3 | |||
* 10 Line Concentrator | |||
* Line Insulation Test | |||
* Permanent Signal Holding Trunks | |||
* Office Interrupter (OI) | |||
* Floor Alarm (FLA 100) | |||
* CARW Equipment (2 bays) | |||
* Intercepting and Announcement equipment | |||
* Emergency Alarm | |||
* Call Data Transmitter (CDT) | |||
* Billing Data Transmitter (BDT) | |||
[[Category:Connections Museum Exhibits]] | [[Category:Connections Museum Exhibits]] | ||