Interphase Tech iSPAN 5535 PRI - Manual (Page 160)

Glossary
140 Interphase Corporation
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 pro-
posed standards and specifications. RFCs can be either approved, or
archived as historical recommendations.
RJ-45 connector ◆ Standard 8-wire connector for IEEE 802.3 net-
works 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 imple-
ments 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, stan-
dards-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.