int use; /* number of ports that use this interface */
int l1link; /* down(0) or up(1) */
int l2link; /* down(0) or up(1) */
+ int los, ais, rdi, slip_tx, slip_rx;
int channels;
char busy[256]; /* if port is idle(0) busy(1) */
unsigned long port[256]; /* current port */