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.
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
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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