B-50
Appendix B: Glossary
SPID Service Profile IDentifications. A unique identifier used to identify a particular
ISDN line and the service and features that line provides. The SPID is generally
a 10+ digit number that includes the LDN.
Splitter A splitter electronically isolates the lower frequencies of the telephone signal
from the higher frequencies of the DSL signals. Typically, the CO contains the
splitter. Splitters are also used to run dedicated wiring for a DSL signal because
they physically isolate the DSL wiring from the POTS wiring.
SROS Secure Router Operating System. The operating system that allows a user to
configure the ProCurve Secure Router.
SSH Secure SHell. A program/network protocol that allows a user to log into
another computer over a network, execute commands in the remote
machine’s OS, and move files from one machine to another. SSH provides
strong authentication. It secures communications over insecure channels and
can be used when tunneling. For more information on SSH, see the Internet
Draft at http://www.free.lp.se/fish/rfc.txt/.
SSL Secure Sockets Layer. SSL is protocol for securing the transmission of mes-
sages over the Internet. SSL works by using asymmetric keys to encrypt
message data.
SS7 Signaling System 7. SS7 is a type of out-of-band signaling that supports the
call-establishment, billing, routing, and information-exchange functions of the
PSTN. It is used to set up and tear down the vast majority of telephone calls.
ST Connector A fiber-optic cable connector that uses a bayonet plug and socket. The ST
connector was the first de-facto standard connector for most commercial fiber
optic wiring.
Figure G-3. ST connector
Stateful
Inspection
Firewall
A firewall that screens incoming traffic on several OSI layers. The stateful-
inspection firewall monitors each session to make sure that it is legitimate.
Stateful-inspection firewalls also use an advanced packet-filtering technology
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