Acterna is the world's largest provider of test and management solutions for optical transport, access and cable networks and the second largest communications test company overall. Acterna is focused entirely on providing instruments, systems, software and services that help customers develop, install, manufacture and maintain their communications networks. ??These tip and ring cables allow the end user to connect to a telephone line via an RJ11 jack or with alligator clips. Alligator clips include jaws, needles and bed of nails.