Planet GS-5220 Series User Manual page 558

PHY is an abbreviation for Physical Interface Transceiver and is the device that implement the
Ethernet physical layer (IEEE-802.3).
PING
is a program that sends a series of packets over a network or the Internet to a specific computer in
Ping
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.
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.
PPPoE
PPPoE is an acronym for Point-to-Point Protocol over Ethernet. It is a network protocol for encapsulating
User's Manual of GS-5220 LCD Series
558