Glossary
Glossary-8
T-Series Traffic Director Installation, Configuration and Administration Guide
PSN
The Packet-Switched Network. PSN networks use packet-switching technology for the transfer of
data. Also called a PSDN (Packet-Switched Data Network).
PSTN
Public Switched Telephone Network. This is the network referred to when discussing telephone
calls transmitted in the “traditional” way, over regular phone lines. It is also an abbreviation used
to refer to the local phone company. PSTN provides 2-wire analog circuits for voice transmission.
The most common phone line is the dial-up line, or switched circuit, which uses two wires to
connect the customer's phone jack to the phone network.
QoS
Quality of Service. QoS is a measure of performance for a transmission system that reflects its
transmission quality and service availability. QoS also provides bandwidth reservation and limited
packet delays.
RADIUS
Remote Authentication Dial-In User Service. An authentication and accounting system used by
many Internet Service Providers (ISPs) and mobile operators. RADIUS authenticates modem,
ISDN, and wireless device connections and tracks network connection time.
RAN
Radio Access Network. The RAN includes infrastructure components within the cell site and the
central office.
RMON
The IETF Remote Monitoring MIB. This
provides access to information gathered by a
remote probe in order to remotely monitor and troubleshoot network segments.
root account
Privileged account on UNIX systems used exclusively by network or system administrators.
route
Route refers to the action of moving a frame between two layer 2 networks (LANs) using layer 3
protocols such as IP. A routed frame will be modified in a number of ways depending on the layer
3 protocols.
routing protocol
A formula used by routers to determine the appropriate path onto which data should be forwarded.
The routing protocol also specifies how routers report changes and share information with the
other routers in the network that they can reach. A routing protocol allows the network to
dynamically adjust to changing conditions, otherwise all routing decisions have to be
predetermined and remain static.
router
A device that forwards data packets from one local area network (
) or wide area network
) to another. Based on routing tables and routing protocols, routers read the network address
in each transmitted frame and make a decision on how to send it based on the most expedient route
(traffic load, line costs, speed, bad lines, etc.). Routers work at layer 3 in the protocol stack,
whereas bridges and switches work at layer 2.
SEM
Shelf Extension Module.
The Shelf Extension Module (SEM) is a 10-port, 10-Gb Ethernet
switch that replaces the Line Interface Module (
) in an extension shelf. The SEM acts as
a pure Layer 2 switch. It provides Layer 2 connectivity between the LIM in the primary
shelf and the ASMs in the extension shelf. The SEM does not provide load balancing
functionality and can be used only in an extension shelf.
The T3100 extension shelf supports two SEMs for redundancy, with both being active and
capable of passing traffic. Each SEM connects directly (and only) to a corresponding LIM in
the primary shelf. The SEM is managed through the Bytemobile CLI or Web GUI.
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