Lucent Technologies PacketStar PSAX, User Manual, Page: 390 / 405

255-700-243 Glossary-49
PacketStar
®
PSAX 12-Port Medium-Density DS1 Multiservice Module User Guide , Issue 1 Release 8.0
Glossary
SEL selector. A subfield in the SETUP message part of an ATM
endpoint address domain specific part (DSP), defined by ISO
10589. This is not used for ATM network routing, but by ATM
end systems only.
semipermanent virtual circuit See SPVC.
serial A transmission method that sends each data bit sequentially
on a single channel.
server Any system that maintains and administers files that are used
by independent, client applications. In a client/server archi-
tecture, the server functions as the high-end computer, which
processes data and applications that are shared by all users of
the network. The client is the user’s personal computer that is
used to access the network and run other applications.
service access multiplexer See SAM.
service access point See SAP.
service level interworking See FRF.8
service protocol translation A process that performs segmentation and reassembly (SAR)
to adapt non-native ATM services to ATM-based services and
back again. It ensures that the data stream is mapped to stan-
dard ATM Adaption Layer (AAL) protocols.
service provider A company that offers voice, video, or data access to a net-
work or to another service; for example, to the Internet.
service types A category of data transmission provided by a public data net-
work in which the data signaling rate, the terminal operating
mode, and the code structure, are standardized. Note: Class of
service (service types) are defined in CCITT Recommendation
X.1.
service-specific connection-oriented
protocol See SSCOP.
service-specific convergence sub-
layer See SSCS.
SF superframe. A DS1 framing format is which 24 DSO timeslots
plus a coded framing bit are organized into a frame. This
frame is then repeated 12 times to form the superframe.
SG signaling gateway. A devise that initiates and manages call
setup and release, and then executes call routing in a Signal-
ing System 7 (SS7) configuration. A signaling gateway uses
an Access SS7 Gateway Control Protocol-Q.931+ (ASGCP-
Q.931+) license, and Internet Protocol Device Control (IPDC)
license, or a Q.931+ license. It uses a TCP/IP protocol to carry
control messages back and forth between a Multiservice
Media Gateway.
signaling gateway See SG.
Signaling System 7 See SS7.