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LGB5128A User Manual
242
PING
ping is a program that sends a series of packets over a network or the Internet to a
specific computer 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 the 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.
Private VLAN
In a private VLAN, communication between ports in that private VLAN is not permitted. A
VLAN can be configured as a private VLAN.
PTP
PTP is an acronym for Precision Time Protocol, a network protocol for synchronizing the
clocks of computer systems.
Q
QCE
QCE is an acronym for QoS Control Entry. It describes QoS class associated with a
particular QCE ID.
There are six QCE frame types: Ethernet Type, VLAN, UDP/TCP Port, DSCP, TOS, and
Tag Priority. Frames can be classified by one of 4 different QoS classes: “Low,” “Normal,”
“Medium,” and “High” for individual applications.
QCL