Which type of standard modular jack has eight positions and eight contacts?

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The type of standard modular jack that has eight positions and eight contacts is indeed the RJ45. This specification is commonly used in networking applications, particularly in Ethernet connections. The RJ45 connector features eight pins which allow it to accommodate the wiring for multiple data transmission channels, effectively providing a robust connection for network communications.

In contrast, the RJ11 and RJ12 connectors are typically used for telephone connections. RJ11 has six positions but only utilizes two or four contacts, making it suitable for standard telephone lines. RJ12 has six positions and utilizes all six contacts, allowing it to support more complex telephone systems but still falls short of the eight contacts required for Ethernet connections. RJ25 is another variant in the RJ family, typically used for multi-line telephone systems; it also has ten positions but not all are utilized for standard connections.

Therefore, the RJ45's design with eight positions and eight contacts is specifically intended to support the high-speed and multi-channel data transfer needed in modern networking environments.

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