A range of security key accessories for RJ45 modular jack connectors has been introduced by the AMP Nectconnect, a business unit of Tyco Electronics.

The connector accessories, which include plugs, jacks and patch cords (with locks at both ends), are designed to physically prevent the use of all RJ45 module jacks without the correct key. 

Each product uses an auto-lock mechanism that locks automatically when it is inserted into the jack. The key is only needed to remove it. Many key variations are available, allowing security control to be implemented independently for each business or department.

The security system can be used with all types of RJ45 (ISO8877 standard) modules, and keys can be made to order. All material used in the security accessories is fully RoHS compliant.

See http://www.tycoelectronics.com