Abstract: A network interface unit includes an interface module for translating messages transmitted between one of a family of different types of service delivery units. Each type of service delivery unit provides a network service that is different than the network service provided by the other types of service delivery units in the family. The service delivery unit connected to the network interface unit processes messages received in a first format. The network interface unit thus includes a medium module configured to process data for transmission between the given medium and the service delivery unit, and the interface module. The medium module transmits messages toward the service delivery unit in a second format. The interface module is configured to receive messages transmitted between the medium module and the service delivery unit. The interface module is configured to translate messages from the second format to the first format.

Abstract: A network apparatus having a chassis with an external network data port and a removable electronic module coupled to the network data port through an internal data port when the removable electronic module is present in the chassis. The chassis may also provide power, radio frequency (RF), data bus, and other types of electrical and data connections to the electronic module through the use of additional internal ports. The apparatus may additionally be connected to others via a data bus, and be included as part of a rack-mounted system. The electronic module may be inserted and removed from the chassis while electrical power is applied to the chassis.