DeWalt AV200 manual Security Configuration, Adapter Configuration, Trigger

Adapter Configuration

When several traffic flows are sharing the same network, it is sometimes necessary to establish several levels of priority in order to guarantee that bandwidth-sensitive applications like video and telephony function smoothly under network congestion. The traffic classifier is a packet inspector that is able to recognize several patterns in an Ethernet frame, and assign a different priority to each of them. To ensure that the classification is done correctly, there is a trigger mechanism prior to the actual classification. The trigger mechanism is also based on pattern recognition of a given location in each Ethernet packet. The following picture depicts the packet classification mechanism:

Offset

Offset

									Ethernet Packet
Bitmask			Bitmask
Pattern			Pattern 1					Prio 1
		=			=
			Pattern 2					Prio 2
						=
			Pattern 3					Prio 3
	Trigger						=
								Prio 8	26
			Pattern 8				=
				Other				Default Priority

There is one offset, and one bitmask and pattern for the trigger condition. The trig- ger condition is used to make sure that the Ethernet frame contains, for example, an IP frame. To check this condition, the offset must be set to 16 and the bitmask to 0xFFFF. If the resulting pattern is 0x0800, then the Ethernet frame contains an IP packet and the classification can be made to a known field.

There is another offset and bitmask for the classification condition. The resulting value is compared with a set of patterns. If the value matches a given pattern, the packet will be classified with the specified priority. If the value does not match any of the patterns, it will get a default priority.

There is a set of pre-defined criteria which classifies traffic based on the 802.1p field of the Ethernet packet or the TOS field of the IP packet.

3.4.8Security Configuration

The configuration page allows you to change the password. Type your new pass- word and confirm by typing it in a second time. If both fields are left empty, the password will be disabled (the message ‘No password installed’ will be shown). You can turn the password protection back on at any time by simply entering a pass- word, as described above.

Corinex AV200 Powerline Ethernet Wall Mount