Both a punch down and crimp tools are used with ethernet cables, however a crimp tool is used to attach an RJ-45 connector.
A modular connector is an electrical connector that was originally designed for use in telephone wiring, but has since been used for many other purposes. Many applications that originally used a bulkier, more expensive connector have converted to modular connectors. Probably the most well known applications of modular connectors are for telephone jacks and for Ethernet jacks, both of which are nearly always modular connectors.
Modular connectors were originally used in the Registration Interface system, mandated …