AT-MR415T and AT-MR815T Installation Guide
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SIGNAL QUALITY ERROR (SQE) TEST—Signal indicates SQE function is
active. The SQE message is sent by the MAU to the DTE in the presence of a
collision.
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.
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 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 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.
TELCO CONNECTOR— A 50-pin receptacle that plugs into the front of the
hub, enabling cables from external devices to connect to the hub.
TRUNK CABLE—Coaxial cable used for distribution of signals over long
distances throughout a cable system.
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 W. Level 3,
Level 4 and Level 5 UTP cables fit these criteria.
