Telephone Jacks & Plugs Amphenol Nexus Technologies Telephone Jacks and Plugs are airborne audio connectors that meet MIL-DTL-9177 qualifications. The ruggedized design of these jacks and plugs offers environmental resistance and RFI/EMI protection. Other features of Amphenol Nexus Technologies Telephone Jacks and Plugs include low-level circuit capabilities and high cross-talk resistance.