CHAPTER 1: GLOSSARY GLOSSARY
MULTINET4 MULTI-PORT SERIAL SERVER & MANAGED SWITCH – INSTRUCTION MANUAL 1–5
RS-232 A popular standard for passing serial binary data point-to-point
between digital systems. Also known as EIA-232. Compare to RS-485.
RS-485 A standard for passing serial data in point-to-point or multipoint
configurations among digital data systems. Also known as EIA-485.
Less common but more versatile than RS-232.
RSA Rivest-Shamir-Adleman key. A two-part key. The private key is kept by
the owner; the public key is published.
RSTP Rapid Spanning Tree Protocol. RSTP is a protocol that prevents loops in
bridged LAN environments. It also provides for fast recovery from link
failures. This product supports RSTP as specified in IEEE 802.1D (2004).
RSVP Resource reSerVation Protocol. One of the communications protocols
of the Internet Protocol Suite. Used to support Quality of Service (QoS)
flows.
RTS/CTS Request to Send/Clear to Send. RS-232 flow control signals sent by
transmitting stations (RTS) and receiving stations (CTS).
RTU Remote Terminal Unit. A device that collects data from data
acquisition equipment and sends it to the main system over a
network.
SA Security Association. In IPSec an SA defines a secure, unidirectional
communication channel between two entities.
SADB Security Association Database. An IPSec database containing security
information specific to particular connections.Compare to SPD.
SFP Small Form-factor Pluggable Transceiver. A full-duplex serial interface
converter that converts electrical signals to optical signals to run over
fiber.
SHA-1 Secure Hash Algorithm 1. A common cryptographic hash function.
SNMP Simple Network Management Protocol. A network monitoring and
control protocol.
SNTP Simple Network Time Protocol.
SPD Security Policies Database. An IPSec database containing security
policies general to the device. Compare to SADB.
SPI Security Parameters Index. A value added to the header in IPSec
tunneling that identifies a session and its encryption properties.
SSH Secure SHell. A network protocol using public key cryptography to
provide secure remote login.
SSL Secure Socket Layer. A cryptographic protocol that creates a secure
data transfer session over a standard TCP connection.
Term Definition
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