Glossary

REN (Ringer Equivalence Number) A standard requirement of the FCC for devices such as a telephone or answering machine. The required REN can be found on a label on the bottom of the analog device.

repeater Device that acts as an amplifier. Also known as a Line Extender. This device is needed when the distance between the phone company’s Central Office and your premises exceeds distance or dB loss limits.

RFC (Request for Comment) IETF documents that contain proposed standards and specifications. RFCs can be either approved, or archived as historical recommendations.

RJ-45 connector Standard 8-wire connector for IEEE 802.3 networks and some telephone applications.

router A hardware device that connects two or more networks. A router determines where the destination computer is located, and then finds the best way to get there.

SAPI (Service Access Point Identifier) Part of the address in an ISDN signalling frame. Identifies the service that the signalling frame is intended for.

SDU (Service Data Unit) User data passed through a SAP between the layers of the OSI or a similar model.

signalling An ATM connection procedure that dynamically implements explicit routes through switches to establish a communication link with another station on the network.

S Interface The interface point between an ISDN device and the user premises network termination.

SNMP (Simple Network Management Protocol) A high-level, standards -based protocol for network management, usually used in TCP/ IP networks. An SNMP manager controls and measures the activities of SNMP agents that are embedded in nodes and network devices on the network. SNMP relies on MIBs embedded in the network resources to monitor and control the network.

SPID (Service Profile IDentifier) An alphanumeric string that uniquely identifies the service capabilities of an ISDN terminal. This is an identifier that points to a particular location in the Telco’s central office switch memory where relevant details about the device are stored. Each BRI connection can have up to two SPIDs, one for each B channel.

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