User manual

Glossary

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 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 connect to the same pins of another connector. For example,

pin 1 of one connector connects to pin 1 of another connector.

TCP/IP PROTOCOLS—A set of protocols for inter-computer

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 inter-computer networking technology.

TCP/IP is also popular among PC users, particularly as a means of

communication with large multi-user computers.

TELCO CONNECTOR—A 50-pin receptacle that plugs into the front of

the hub, enabling cables from external devices to connect to the hub.

THICK ETHERNET—See 10BASE5

THIN ETHERNET—See 10BASE2

TRUNK CABLE—The trunk coaxial cable system.

UNMANAGED MODULE—A repeater that behaves as a “dumb” repeater

in a department concentrator chassis (i.e., without a Master). It performs

simple repeating tasks like packet retiming and regeneration, but is not

managed.

UNSHIELDED TWISTED PAIR (UTP)—A cable used in 10BASE-T

wiring that consists of at least two twisted pairs of 22 to 26 AWG wire. The

pairs should have at least 3 twists per foot and have an impedance of 100 Ω.

Level 3 and Level 4 UTP cable generally fits these criteria.