(For bridging.) The number of high-priority packets
that will be transmitted for each low-priority
packet. If the value is 0, then low-priority packets
will only be transmitted when there are no packets
in the high-priority queue.
This object only applies to serial ports. Interleaving
will not take affect on non-serial ports and this object
will have the value 0 for those ports.
Note, this object has been deprecated from software versions
7.0 and later.