PVC: Permanent Virtual Circuit. Virtual circuit that is permanently established.

QoS: Quality of Service. The expected data loss or latency.

remote access: Communication from a remote location or facility through a data link.

remote digital loopback test: This test loops the remote digital receiver output back into the transmitter input.

remote host: The computer receiving the network commands.

RFC: Request for Comments. Documents published by the Internet Engineering Task Force pertaining to Internet protocols and policies.

RIP: Routing Information Protocol. The protocol governing the exchange of routing information.

RJ11: A 6-position jack used with dial networks and telephone sets.

RJ45: An 8-position jack used with programmable dial networks.

router: Protocol-dependent device that connects subnets together. Routers operate at the network layer (layer 3) of the ISO Open Systems Interconnection--Reference Model.

routing table: A table that lists routing paths to enable a node to route traffic to another node in the network.

RS-232:a low-speed, 25-position, DCE/DTE interface.

server: Hardware or software that offers a specific service, such as database management, to a client.

SHDSL: Symmetric High Bit Rate Digital Subscriber Loop. A DSL technology that allows symmetrical transmissions over longer distances. Defined by the G991.2 ITU standard.

SLA: Service Level Agreement. A contract between a service provider and a customer, which guarantees a minimum level or quality of service to the customer.

SMTP: Simple Mail Transport Protocol. A protocol used to transfer e-mail between or among servers.

SNMP agent: An application program that enables communication between a management system and a device.

SNMP trap: A message sent to a SNMP manager to communicate information about changes in the network, such as a device being reset.

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