This attribute specifies the value of the Type Of Service (TOS) byte
with which packets are updated when this COS treatment is
selected. This attribute is ignored if setTosByte is set to no. The
actual TOS byte of the packet is updated based on the tos and
tosMask attribute using the following formula:
New TOS = ( Original TOS & ~tosMask ) | ( tos & tosMask )
For example:
Original TOS byte: hex 8A (10001010 in binary)
tos attribute: hex 12 (00010010 in binary)
tosMask attribute: hex 3F (00111111 in binary)
The changed TOS byte would be: hex 92 (10010010 in binary).