HP PROCURVE 2520 Management And Configuration Manual page 346

Configuring for Network Management Applications
LLDP (Link-Layer Discovery Protocol)
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This section describes how to configure and use LLDP-MED features in the
switches to support VoIP network edge devices (Media Endpoint Devices)
such as:
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Switches Providing Network
Access to LLDP-MED Endpoints
IP Network
Infrastructure
(IEEE 802 LAN)
Figure 13-17. Example of LLDP-MED Network Elements
LLDP-MED Endpoint Support. LLDP-MED on the switches covered in this
guide interoperates with directly connected IP telephony (endpoint) clients
having these features and services:
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Power over Ethernet (PoE) status and troubleshooting support via
SNMP
support for IP telephony network troubleshooting of call quality
issues via SNMP
IP phones
voice/media gateways
media servers
IP communications controllers
other VoIP devices or servers
LLDP-MED Class 1 Generic Endpoints
Such As IP Call Control Devices
LLDP-MED Class 3 End-User IP Communication
Devices Such As VoIP Telephones
able to autonegotiate speed and duplex configuration with the switch
LLDP-MED Class 2 Media Endpoints Such As
Media Gateways, Conference Bridges, and
other Devices Supporting IP Media Streams