Video Disk Control Protocol: Difference between revisions

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{{Short description|Communication protocol}}

'''Video Disk Control Protocol''' ('''VDCP''') is a proprietary [[proprietary communications protocol]] primarily used in [[broadcast automation]] to control [[hard disk]] [[video server|video servers]]s for [[broadcast television]]. [[VDCP]] was originally developed by [[Louth Automation]] and is commonly called the '''Louth Protocol'''. At the time it was developed, when Hewlett Packard (whose broadcast server division was eventually sold to [[Pinnacle Systems]]) and Grass Valley Group[[Tektronix]] were both bringing to market the first of the VideoFile Servers to be used in the Broadcastbroadcast Industryindustry. They contacted Louth Automation who then designed the [[communications protocol]] basing it on Sony Protocolsprotocols of both the Sony LMS Storage Device and the Sony VTR. The principal work was carried out by Ken Louth andat StanLouth BeckerAutomation.

VDCP uses a tightly coupled master-slave methodology. The controlling device takes the initiative in communications between the controlling devicebroadcast ([[automation)]] device and the controlled device (video disk). VDCP conforms to the [[Open Systems InterconnectInterconnection]] (OSI) reference model.

VDCP is a [[serial communications]] protocol based on [[RS-422]]. It is derived from the [[Sony]] [[9-Pin Protocol]], an industry-standard protocol for control of professional broadcast [[VTR]]s that is used in [[Online editing (video production)|online editing]].

Full details of the protocol are available from [[HarrisImagine Communications Broadcast]]who, aas division of [[Harris Corporation]] whoBroadcast, acquired Louth in [[2000]].

It was largely succeeded by the [[Network Device Control Protocol]].<ref name="q429">{{cite web | title=Harris launches network-based automation protocol for controlling broadcast audio/video devices | website=Digital Broadcasting com | date=2001-02-14 | url=https://www.digitalbroadcasting.com/doc/harris-launches-network-based-automation-prot-0001 | access-date=2025-08-14}}</ref>

In [[2001]] Harris announced the introduction of [[NDCP]], a TCP/IP-based successor for VDCP. Little information on NDCP is readily available, and thus VDCP has remained the de-facto standard.

==External linksReferences==

{{Reflist}}

==External links==

* [http://www.broadcast.harris Harris Broadcast]

* [http://imaginecommunications.com/ Imagine Communications (formerly Harris Broadcast)]

* [http://www.broadcast.harris.com/support/kb/supportdocs.asp?fid=1250 VDCP Protocol Document ]

* [http://www.harris.com//view_pressrelease.asp?act=lookup&pr_id=476 NDCP Launch press release]

[[Category:Broadcast engineering]]

[[Category: Television technology]]

[[Category:Digital television]]

[[Category:VideoTelevision and movie technologyterminology]]

{{tv-tech-stub}}