PA-4E1G-120 is a chassis-mounted processor-card based port adapter for use within a range of data communications (gateway and router) chassis supplied by Cisco Systems. The PA-4E1G-120 port adapter is a product that, when used with the VIP2 cards, provides all of the hardware and software to allow connection of Cisco's chassis to digital leased-line circuits (point to point) using CCITT (ITU-T) recommendation G.703 operating protocols at speeds up to 2 Mbps. The PA-4E1G-120 port adapter is fully transportable between compatible host chassis. The choice of each compatible chassis has no effect on capabilities, functionality, or performance of the PA-4E1G-120 port adapter.