Interphase Tech RAS Communications Controller 5536 - Manual (Page 234)

Glossary
214 Interphase Corporation
RS-232 ‹ Universally accepted Electronics Industries Association
standard that defines the signals between data terminal equipment and
data communications equipment. Uses a 25-pin connector; theoreti-
cally limited to distances of 50 feet; functionally identical to standards
V.24/V.28.
RS-422 ‹ Electronics Industries Association standard for balanced
transmission at distances greater than 50 feet. Compatible with V.11.
RTS (request to send) ‹ RS-232 (V.24) control signal, sent from the
data terminal equipment to the data communications equipment on pin
4. Indicates that the DTE has data to transmit. (See
RS-232 .)
Rx ‹ Abbreviation meaning receive, receiver, or reception.
SAPI (Service Access Point Identifier) ‹ Part of the address in an
ISDN signalling frame. Identifies the service that the signalling frame
is intended for.
SDLC ‹ See Synchronous Data Link Control.
Serial transmission ‹ Technique in which each bit of information is
sent sequentially on a single channel. Serial transmission is the normal
mode for data communications. Contrast with parallel transmission.
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.
SDLC ‹ See Synchronous Data Link Control.
SNA ‹ IBM’s Systems Network Architecture. The part of a user-
application network that conforms to the formats and protocols of Sys-
tems Network Architecture. It enables reliable transfer of data among
users and provides protocols for controlling the resources of various
network configurations. The SNA network consists of network acces-
sible units (NAUs), boundary function, gateway function, and interme-
diate session routing function components, and the transport network.
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.