This picture shows the type of connectors used on the cables that go between the modules.

These connectors are similar to an RJ-11 phone connector, but these are the RJ-45 8-pin connectors... a connector that is much larger and more robust than phone connectors (these large connectors are commonly used in computer network applications).

A significant feature of our cables is that we use a special RJ45 connector that has a snag resistant clip  --notice in the photograph that the clip curls down toward the body of the connector, thus reducing the chance that the clip could snag and break.

Therefore, these connectors last MUCH LONGER than typical RJ45 connectors.