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. | 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. | ||
| Line 23: | Line 23: | ||
* 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 | ||
== | == 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: | ||
| Line 41: | Line 41: | ||
* 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 == | ||
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: | 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 | Aisle 4 | ||
* Line Link Frame (LLF) | * Line Link Frame (LLF) | ||
| Line 52: | Line 53: | ||
* District Link (DL) | * District Link (DL) | ||
* Office Link (OL) | * Office Link (OL) | ||
* Incoming Trunk Test Connector | |||
* Incoming Link (IL) | * Incoming Link (IL) | ||
* Incoming Trunk (100 trunks) | * Incoming Trunk (100 trunks) | ||
| Line 59: | Line 61: | ||
* Terminating Sender Frame (3 MF, 2 FS term senders, total of 5) | * Terminating Sender Frame (3 MF, 2 FS term senders, total of 5) | ||
* Sender Selector equipment | * Sender Selector equipment | ||
* Recorded announcement frame | |||
Aisle | Aisle 3 | ||
* Line Distributing Frame (LDF) | * Line Distributing Frame (LDF) | ||
| Line 71: | Line 74: | ||
* Block Relay Frame (BRF 0) | * Block Relay Frame (BRF 0) | ||
* ANI Number Network Primary (ANI NN) | * ANI Number Network Primary (ANI NN) | ||
* ANI Trunk Frame ( | * ANI Trunk Frame (ANI T) | ||
* ANI Outpulser (ANI OP) | * ANI Outpulser (ANI OP) | ||
* ANI Identifier | * ANI Identifier | ||
| Line 77: | Line 80: | ||
* Terminating Marker | * Terminating Marker | ||
* Terminating Marker Connector | * Terminating Marker Connector | ||
* 100 Line Concentrator | |||
Aisle | Aisle 2 | ||
* 10 Line Concentrator | * 10 Line Concentrator | ||
* Line Insulation Test | * Line Insulation Test (LIT) | ||
* MF Current Supply (MFCS) | |||
* Permanent Signal Holding Trunks | * Permanent Signal Holding Trunks | ||
* Originating Sender Test Relay Rack | |||
* Office Interrupter (OI) | * Office Interrupter (OI) | ||
* Floor Alarm (FLA 100) | * Floor Alarm (FLA 100) | ||
* Emergency Alarm | |||
* CARW Equipment (2 bays) | * CARW Equipment (2 bays) | ||
* Intercepting and Announcement equipment | * Intercepting and Announcement equipment | ||
* Call Data Transmitter (CDT) | * Call Data Transmitter (CDT) | ||
* Billing Data Transmitter (BDT) | * 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]] | ||