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OAM F5 Loopback Test 

An Operational, Administration and Maintenance Function 5 test is used to test the connection between two DSL devices. First, the DSL devices establish a virtual circuit. Then the local device sends an ATM F5 cell to be returned by the remote DSL device (both DSL devices must support ATM F5 in order to use this test).



In computer networking an octet is an 8-bit binary digit (byte).


Original Equipment Manufacturer. This is a designation for companies that manufacture equipment that is then marketed and sold off to other companies under their own names.



The Orthogonal Frequency Division Multiplexing (OFDM) modulation technique divides a digital signal into many separate waves. IEEE 802.11g wireless networks use OFDM to send and receive data at 6 to 54 Mbps. A frequency transmission that separates the data stream into a number of lower-speed data streams, which are transmitted in parallel to prevent information from being lost in transit.



Orthogonal Frequency Division Multiple Access (OFDMA) extends OFDM to allow multiple access on the same channel. WiMAX uses OFDMA to accommodate multiple users in the same channel at the same time.



In the Simple Network Management Protocol (SNMP), an Object IDentifier (OID) is the name of a piece of SNMP data found in an SNMP agent's Management Information Base (MIB). The SNMP agent provides MIB data to the manager, which uses each datum's OID to identify and process it appropriately. OID names use the ASN.1 (Abstract Syntax Notation One) standard and are registered with IANA (the Internet Assigned Numbers Authority).



In a PON, an Optical Line Terminal (OLT) is placed at broadband service provider’s central office, where it receives voice, video, and other data from the service provider’s networking servers. It then converts and transmits this data as light across a fiber optical network, where it is received and translated on the opposite end by one or more Optical Network Units (ONUs). See also ONU and PON.


On-Screen Display

On-Screen Display (OSD) allows you to customize display settings.



In a PON, an Optical Network Unit (ONU) is a fiber optical modem that allows a subscriber or client to receive very high-speed Internet access over an optical network.


ONU MAC Authentication

ONU MAC Authentication allows an OLT to validate an ONU's access and registration to the OLT based on the ONU's MAC address.


ONU Silence Timeout

The time interval (in seconds) in which an OLT allows the failed ONUs to register with it again.


Open Mobile Alliance Device Management

Open Mobile Alliance Device Management (OMA-DM) is a protocol designed to facilitate the remote updating and mangement of mobile devices.


Operator ID

In a WiMAX network, the operator ID identifies the service provider. Subscriber and mobile stations can connect only to base stations broadcasting their service provider's operator ID.


OSI Basic Reference Model

The Open Systems Interconnection Basic Reference Model (OSI Model for short) is a layered, abstract description for communications and computer network protocol design, developed by the ISO (International Organization for Standardization). The OSI Model is sometimes referred to as a seven-layer model.

OSI Level-7 Inspection

Applications such as anti-virus, ADP, IDP, content filter, anti-spam, and application patrol OSI level-7 inspect traffic's IP payload for matches to known patterns in order to identify viruses, anomalies, intrusions, web content, spam, and application types.



OSPF is a link-state protocol designed to distribute routing information within an autonomous system (AS).


OSPF Interface

An OSPF interface is a link between a layer 3 device and an OSPF network.


OSPF Redistribution

Route redistribution is used when routers using RIP routing protocol and/or static routes need to exchange routing information with a switch using the OSPF routing protocol.



OTIST (One-Touch Intelligent Security Technology) allows you to transfer your APs SSID and WEP or WPA-PSK security settings to wireless clients that support OTIST and are within transmission range.


OUI Filter

An OUI (Organizationally Unique Identifier) filter blocks or forwards packets from devices with the specified OUI in the MAC address. The OUI field is the first three octets in a MAC address. An OUI uniquely identifies the manufacturer of a network device.


Outbound Proxy

An outbound proxy receives data requests from a SIP client then passes them on to the real SIP server.


Out-of-Band POTS Signaling

As well as transmitting and receiving voice band data, a VoIP line card can communicate with the subscriber!|s phone using out-of-band signals such as on hook, off hook, and rings.


Out-of-band Management

Out-of-band management means accessing the management interface of a device through a management port. See also Management Port.