User's Manual

26
3.1.3 VLAN CoS (Class of Service)
VLAN CoS is the IEEE802.1p standard with added traffic class expediting and dynamic multicast filtering
to the IEEE 802.1D standard. The CoS value is to specify the priority queue used for specified class if it is
supported by the switch. The administrator can assign a different CoS value for media (RTP) and signal
(SIP) packets.
The priority level and value are described in the table below:
Priority Acronym Traffic Types
0 (lowest) BK Background
1 BE Best Effort
2 EE Excellent Effort
3 CA Critical Applications
4 VI Video, < 100 ms latency and jitter
5 VO Voice, < 10 ms latency and jitter
6 IC Internetwork Control
7 (highest) NC Network Control
3.2 LLDP
The Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol in the Internet Protocol
Suite used by network devices for advertising their identity, capabilities, and neighbors on an IEEE 802
local area network, principally wired Ethernet.
For switches which support LLDP advertising, it can also configure VLAN ID to the connected host.
Both the LAN port and the WAN port of the color screen phones support VLAN settings to authenticate or
differentiate the network. Oppositely, the common phone cannot.