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P
P
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 implement the Ethernet
physical layer (IEEE-802.3).
PING
ping 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 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
402 - Glossary
RocketLinx MP1204-XT User Guide: 2000644 Rev. A
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