Appendix C:
Glossary
NGSME24G4S User Manual | 385
SSH
SSH is an acronym for
S
ecure
SH
ell. It is a network protocol that allows data to be
exchanged using a secure channel between two networked devices. The encryption used by
SSH provides confidentiality and integrity of data over an insecure network. The goal of SSH
was to replace the earlier rlogin, TELNET and rsh protocols, which did not provide strong
authentication or guarantee confidentiality.
SSM
SSM In SyncE this is an abbreviation for Synchronization Status Message and is containing
a QL indication.
STP
S
panning
T
ree
P
rotocol is an OSI layer-2 protocol which ensures a loop free topology for any
bridged LAN. The original STP protocol is now obsolete by RSTP.
SyncE
SyncE Is an abbreviation for Synchronous Ethernet. This functionality is used to make a
network 'clock frequency' synchronized. Not to be confused with real time clock synchronized
(IEEE 1588).
T
is an acronym for
T
erminal
A
cess
C
ontroller
A
ccess
C
ontrol
S
ystem
P
lus. It is a
networking protocol which provides access control for routers, network access servers and
other networked computing devices via one or more centralized servers. provides
separate authentication, authorization and accounting services.
Tag Priority
Tag Priority is a 3-bit field storing the priority level for the 802.1Q frame.
TCP
TCP is an acronym for
T
ransmission
C
ontrol
P
rotocol. It is a communications protocol that
uses the Internet Protocol (IP) to exchange the messages between computers.
The TCP protocol guarantees reliable and in-order delivery of data from sender to receiver
and distinguishes data for multiple connections by concurrent applications (for example, Web
server and e-mail server) running on the same host.
The applications on networked hosts can use TCP to create connections to one another. It is
known as a connection-oriented protocol, which means that a connection is established and
maintained until such time as the message or messages to be exchanged by the application
programs at each end have been exchanged. TCP is responsible for ensuring that a
