User's Manual

Network features 423
• IP Phone 1120E
• IP Phone 1140E
• IP Phone 1150E
•
IP Phone 1165E
• IP Phone 1210
• IP Phone 1220
• IP Phone 1230
Description
The IEEE 802.1ab Link Layer Discovery Protocol (LLDP) defines a
standard method for Ethernet network devices, such as IP Phones,
switches, and routers to exchange information about their capabilities with
other devices and to store this information in a Management Information
Base (MIB).
LLDP also enables the system administrator to view the entire network
infrastructure.
The Telecommunications Industry Association (TIA) developed the
Link Layer Discovery Protocol (LLDP)-Media Endpoint Discovery
(LLDP-MED) extension of 802.1ab LLDP for VoIP networks, as defined by
ANSI/TIA-1057. This extension enables media devices such as IP Phones,
IP media gateways, IP media servers, and IP media controllers to transmit
and receive media related information.
LLDP provides the following functionality
•
periodic transmission of advertisements containing device information
•
device capabilities and media specific configuration information to
neighbors in the same network
•
implementation of behavioral requirements specified by LLDP-MED
LLDP devices advertise their information by sending Type-Length-Value
(TLV) messages to their neighbors. The TLVs supported in the IP phones
include:
• Basic Management TLV
• IEEE 802.1 Organizationally Specific TLV
• IEEE 802.3 Organizationally Specific TLV
• TIA Media Endpoint Discovery (LLDP-MED) TLV - The
Telecommunications Industry Association (TIA) has developed an
extension to LLDP for VoIP networks. VoIP-related extensions to
Nortel Communication Server 1000
IP Phones Fundamentals
NN43001-368 05.06 30 April 2010
Copyright © 2003-2010 Nortel Networks. All Rights Reserved.
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