Glossary-28
RS449
An Electronics Industry Association recommended standard for the
mechanical characteristics of connectors; introduced as a companion standard
to RS422 and RS423. This specifies two connectors (a 37pin connector and
a 9pin connector); not widely used.
RS530
An Electronics Industry Association recommended standard for the
implementation of standard RS422 or RS423 Driver/Receivers on a 25pin
connector (DB25). This is intended as a replacement for RS449 for most
data services using the same connector as RS232.
Rx, receive
An abbreviation meaning receive or reception.
secondary interconnect link
Also known as a backup link, the link serves as a back up to an interconnect
link in the event of primary interconnect link failure.
server
A local area network node that provides services to other nodes on the LAN.
Servers provide printer access and spooling, file access, gateways, etc.
SF, single frequency
See
tone signalling.
shroud
The part of an Integration unit's stacking connector that is mounted on the
underside of a module.
signaling
A handshaking protocol used between telephone equipment. Includes
supervising (on/off hook line status), alerting (ringing), and call addressing
(dialing) for switched services.
signon character
The first character sent on an autobaudrate circuit. It is used to determine
the data rate.
single dial tone plan
A Universal Voice Module feature that supports PBXtoPBX dialing over the
network. It allows dialing of network extension digits sequentially with PBX
digits without waiting for a dial tone from the distant PBX.
