ZyXEL Communications MGS3600-24F User Manual page 374

F M A A
RONT ATTER PPENDIX
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.
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 com-
puter 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 adminis-
trator 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 prev-
alent Internet standard protocols for e-mail retrieval. Virtually all modern e-mail clients and servers support both.
MGS3600-24F/XGS3600-26F/XGS3600-28F A-16 U ' G
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