calc_usecs_unicast_packet
tt += calc_usecs_unicast_packet(sc, size, sn->rates[ndx0].rix,
tt += calc_usecs_unicast_packet(sc, size,
tt += calc_usecs_unicast_packet(sc, size,
tt += calc_usecs_unicast_packet(sc, size,
calc_usecs_unicast_packet(sc, 1600, sn->rates[x].rix,
calc_usecs_unicast_packet(sc, size,