Network modular are also called keystone jack, Modular jack. They can be used in the telephone and network cabling system. You can find them at home, office, shipping mall, almost anywhere. And they are be used in the face plate, patch panel, surface box and so on. 
One side of the module has a female connector for patch-cord connection, the other side of the module has an IDC-type (insulation displacement contact). Normally, we have the RJ11 and RJ45, two kind of female port . And the IDC always be 110 IDC, Krone IDC, Dual IDC and toolless keystone Jack. 
We also welcome OEM keystone Jack for different customers from different country.