CentreCOM 3600 Series Hub/Repeaters
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PUNCH-DOWN BLOCK
—The punch-down block is the wiring panel where the
house wiring from the building’s offices terminates. This is where many
10BASE-T hubs would be located. Wiring installers use a special punch-down tool
to insert the UTP wire for data and voice applications.
REPEATER
—A device used to extend the length, topology, or interconnectivity
of the physical medium beyond that imposed by a single segment, up to the
maximum allowable end-to-end trunk transmission line length. Repeaters perform
the basic actions of restoring signal amplitude, waveform and timing applied to
normal data and collision signals.
RJ45
—This connector is a 10BASE-T standard for connecting UTP cabling. It is
inexpensive and easy to install onto UTP cable.
SIGNAL QUALITY ERROR (SQE)
—Also referred to as Collision or Collision
Presence. This occurs when two devices attempt to transmit at the same time,
which is an illegal condition. All ATI transceivers test for SQE.
SIMPLE NETWORK MANAGEMENT PROTOCOL (SNMP)
— SNMP is a
TCP/IP protocol that generally uses the User Datagram Protocol (UDP) to
exchange messages between a management information base and a management
client residing on a network. Since SNMP does not rely on the underlying
communication protocols, it can be made available over other protocols, such as
XNS or DECnet.
SLAVE
— A repeater that behaves as a “dumb” module managed by a Master in
a department concentrator chassis. Slaves operating standalone perform only
simple regeneration and retiming tasks associated with repeating and are not
manageable.
SQE TEST
—Commonly referred to as Heartbeat, is a special 802.3 signal sent by
the MAU to the DTE to test the collision detection function. Some DTE want SQE
and others do not. Repeaters do not want the SQE Test.
STANDALONE
—Repeater operating as a hub on its own; i.e., not a module
among other modules in a department concentrator chassis.
STRAIGHT-THROUGH
—
A type of wiring connection where the pins of one
connector interface with the same pins of another connector. For example, pin
1 of one connector connects to pin 1 of another connector.
SUBSCRIBER CHANNEL (SC) CONNECTOR
—A type of port connection
where the pins connect through a square push-pull mating interface.
SUB MINATURE ASSEMBLY (SMA) CONNECTOR
—A type of port
connection where the pins connect through a threaded attachment interface
. (Also
referred to as an
SM Connector
.)
STRAIGHT TIP (ST) CONNECTOR
—
A type of port connection
where the
pins connect through a bayonet-style interface
.
TCP/IP PROTOCOLS
—A set of protocols for intercomputer communication,
including network level (Internet Protocol), transport level (Transmission Control
Protocol or TCP) and application level protocols (for example, Telnet terminal
emulation). TCP/IP has been used for many years in two country-wide networks,
the ARPANET and MILNET. Recently, TCP/IP has become very popular with
users of a variety of multi-user computer systems and engineering workstations.
Most UNIX computers use TCP/IP over Ethernet as the main intercomputer
networking technology. TCP/IP is also popular among PC users, particularly as a
means of communication with large multi-user computers.
