Appendix A
Acronyms
137
A LLDP frame contains multiple TLVs For some TLVs it is configurable if the switch shall include the TLV in the LLDP
frame. These TLVs are known as optional TLVs. If an optional TLVs is disabled the corresponding information is not
included in the LLDP frame.
OUI
OUI is the organizationally unique identifier. An OUI address is a globally unique identifier assigned to a vendor by
IEEE. You can determine which vendor a device belongs to according to the OUI address which forms the first 24 bits
of a MAC address.
PCP
PCP is an acronym for Priority Code Point. It is a 3-bit field storing the priority level for the 802.1Q frame. It is also
known as User Priority.
PD
PD is an acronym for Powered Device. In a PoE system the power is delivered from a PSE ( power sourcing
equipment ) to a remote device. The remote device is called a PD.
PHY
PHY is an abbreviation for Physical Interface Transceiver and is the device that implements the Ethernet physical
layer (IEEE-802.3).
PING
Ping (Packet InterNet Grouper) is a program that sends a series of packets over a network or the Internet to a
specific computer in order to generate a response from that computer. The other computer responds with an
acknowledgment that it received the packets. Ping was created to verify whether a specific computer on a network or
the Internet exists and is connected.
Ping uses Internet Control Message Protocol (ICMP) packets. The PING Request is the packet from the origin
computer, and the PING Reply is the packet response from the target.
PoE
PoE is an acronym for Power Over Ethernet. Power over Ethernet is used to transmit electrical power, to remote
devices over standard Ethernet cable. It could for example be used for powering IP telephones, wireless LAN Access
Points (AP), IP cameras and other equipment, where it would be difficult or expensive to connect the equipment to
main power supply.
Policer
A policer can limit the bandwidth of received frames. It is located in front of the ingress queue.
POP3
POP3 is an acronym for Post Office Protocol version 3. It is a protocol for email clients to retrieve email messages
from a mail server.
POP3 is designed to delete mail on the server as soon as the user has downloaded it. However, some
implementations allow users or an administrator to specify that mail be saved for some period of time. POP can be
thought of as a "store-and-forward" service.
An alternative protocol is Internet Message Access Protocol (IMAP). IMAP provides the user with more capabilities
for retaining e-mail on the server and for organizing it in folders on the server. IMAP can be thought of as a remote file
server.
POP and IMAP deal with the receiving of e-mail and are not to be confused with the Simple Mail Transfer Protocol
(SMTP). You send e-mail with SMTP, and a mail handler receives it on your recipient's behalf. Then the mail is read
using POP or IMAP. IMAP4 and POP3 are the two most prevalent Internet standard protocols for e-mail retrieval.
Virtually all modern e-mail clients and servers support both.
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