Interlogix NS3502-8P-2S User Manual - Manual (Page 560)

IFS NS3502-8P-2S User Manual
560
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 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 Point-to-Point Protocol (PPP) frames inside Ethernet
frames. It is used mainly with ADSL services where individual users connect to the ADSL
transceiver (modem) over Ethernet and in plain Metro Ethernet networks (Wikipedia).
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.
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