The ATM Cell layer stats table is for the cell layer over a physical line. There is an entry for each SONET, DS3 or DS1 line. The table maintains objects that apply to ATM end-systems, as well as objects that apply only to ATM switches. In all the following descriptions of objects, CLP-0 means Cell Loss Priority = 0, and CLP-1 means Cell Loss Priority = 1. ATM cells with CLP=0 have a higher priority in regard to cell loss than ATM cells with CLP=1. Therefore, during resource congestions, CLP=1 cells are dropped before any CLP=0 cell is dropped. Ingress direction means coming from network to the switch. Egress direction means going from switch to the network.