Obsolete Patterns
Many other types of connectors using the XLR type shell exist, with various pin configurations. Most notable are two now obsolete three-pin patterns manufactured by ITT Cannon.
The power Cannon (also called the XLR-LNE connector) had shrouded pins and red insulation, it was intended as a mains power connector, but has been superseded by the IEC 60320 series of connectors and increasingly, more recently, the PowerCon connector developed by Neutrik.
Read more about this topic: XLR Connector
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—Joshua Meyrowitz, U.S. educator, media critic. “The Blurring of Public and Private Behaviors,” No Sense of Place: The Impact of Electronic Media on Social Behavior, Oxford University Press (1985)