This entry is valid only when working in rxClk mode. For ACE2002 in case of invalid entry the return value will be 0. For other products in case of invalid entry the return value will be 9999. The valid port number depends on the IO slot no., the installed card type and the port type: outside, inside, SP. * The SP ports will be numbered as follows: - SP port 1 : 1 - SP port 2 : 2 For external ports the convention used will be (for DXC): - first two digits will be: (IO slot number+10) - last one/two digits will be the port number within the card, in odd numbers: port1 = 1 port2 = 3 port3 = 5 etc... Example: port2 of IO slot 11 will be: 213 . For internal ports the convention used will be (for DXC): - first two digits will be: (IO slot number+10) - last one/two digits will be the port number within the card, in even numbers: port1 = 2 port2 = 4 port3 = 6 etc... Example: port2 of IO slot 11 will be: 214 . For Kmux, the port will be according to : Slot*100+Ch. For ACE2002 and LA140, the port will be ifIndex.