Reading through the CLI :
int LineCard 0
connection-mode inline on-failure bypass
VLAN translation ?
decrement Vlan will be decremented on network port and incremented on subscriber port
increment Vlan will be incremented on network port and decremented on subscriber port
So on traffic that is either coming in on either the network side or sub side will get either incremeneted or decremented for vlan translation.
Is there a need to do this ? what scenario are you considering using it in ? if the traffic is bypassed as is shown why you need to further massage it ?