Planet GS-5220 User Manual page 431

O
OAM
OAM is an acronym for Operation Administration and Maintenance. It is a protocol described in ITU-T Y.1731 used to
implement carrier Ethernet functionality. MEP functionality like CC and RDI is based on this.
Optional TLVs.
An LLDP frame contains multiple TLVs. For some TLVs it is configurable if the switch includes the TLV in the LLDP
frame. These TLVs are known as optional TLVs. If an optional TLV is disabled the corresponding information is not
included in the LLDP frame.
OUI
OUI is the organizationally unique identifier. An OUI address is a globally unique identifier assigned to a vendor by
IEEE. You can determine which vendor a device belongs to according to the OUI address which forms the first 24 bits
of an MAC address.
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.
User's Manual of GS-5220 PoE Series Managed Switch
431