View source for Very-high-density cable interconnect

{{Short description|68-pin connector used for SCSI}}
{{Refimprove|date=March 2020}}
[[File:SCSI external VHDCI 01.jpg|thumb|A VHDCI connector.]]
A '''very-high-density cable interconnect''' ('''VHDCI''') is a 68-pin connector that was introduced in the SPI-2 document of [[SCSI]]-3.<ref>{{Cite web|url=https://flylib.com/books/en/4.55.1.80/1/|title=SCSI-3|last=|first=|date=|website=|archive-url=|archive-date=|access-date=2021-06-14}}</ref> The VHDCI connector is a very small connector that allows placement of four wide SCSI connectors on the back of a single PCI card slot. Physically, it looks like a miniature [[Micro ribbon|Centronics]] type connector. It uses the regular 68-contact pin assignment. The male connector (plug) is used on the cable and the female connector ("receptacle") on the device.

==Other uses==
Apart from the standardized use with the SCSI interface, several vendors have also used VHDCI connectors for other types of interfaces:

* [[Nvidia]]: for an external [[PCI Express]] 8-lane interconnect, and used in [[Nvidia Quadro Plex|Quadro Plex]] [[Visual Computing System|VCS]] and in [[Nvidia Quadro#For business NVS|Quadro NVS 420]] as a [http://www.nvidia.com/object/product_quadro_nvs_420_us.html display port connector]
* [[ATI Technologies]]: on the [[FireMV]] 2400 to convey two [[Digital Visual Interface|DVI]] and two [[Video Graphics Array|VGA]] signals on a single connector, and ganging two of these connectors side by side in order to allow the FireMV 2400 to be a low-profile quad display card. The [[Radeon X1950 XTX]] Crossfire Edition also used a pair of the connectors to grant more inter-card bandwidth than the PCI Express bus allowed at the time for [[ATI Crossfire|Crossfire]].
* [[AMD]]: Some Visiontek variants of the [[Radeon HD 7000 series|Radeon HD 7750]] use a VHDCI connector alongside a Mini [[DisplayPort]] to allow a 5 (breakout to 4 [[HDMI]]+1 mDP) display [[Eyefinity]] array on a low profile card. VisionTek also released a similar [[Radeon HD 5000 series|Radeon HD 5570]], though it lacked a Mini DisplayPort.
* [[Juniper Networks]]: for their 12- and 48-port 100BASE-TX PICs (physical interface cards). The cable connects to the VHDCI connector on the PIC on one end, via an [[RJ21|RJ-21]] connector on the other end, to an RJ-45 [[patch panel]].
* [[Cisco]]: 3750 [[Cisco Catalyst#Stackwise|StackWise]] stacking cables
* [[National Instruments]]: on their high-speed digital I/O cards.[http://www.ni.com/digital-instruments/]
* [[AudioScience]] uses VHDCI to carry multiple analog [[balanced audio]] and digital [[AES3|AES/EBU]] audio streams, and clock and [[General-purpose input/output|GPIO]] signals.<ref>{{cite web | url=https://audioscience.com/internet/products/cables/datasheet_bob1038.pdf | title=BOB1038 datasheet | publisher=AudioScience }}</ref>

==See also==
*[[SCSI connector]]

==References==
{{Reflist}}

[[Category:Electrical signal connectors]]
[[Category:Analog video connectors]]
[[Category:Digital display connectors]]
[[Category:Networking hardware]]
[[Category:SCSI]]

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