multiSwitch – user manual
© TOPEX 2008 165
The RTP protocol does not communicate over a standard TCP or UDP port. The only specification
used is the one about UPD communications being made over an even port, and the higher level
uneven port is used for RTCP communications (RTP Control Protocol).
SCP
– Abbreviation for
Secure Copy
–
SCP
is a safe method for transferring files between a local and
a remote system, using the SSH protocol (Secure Shell).
SCTP
– Abbreviation for
Stream Control Transmission Protocol
– represents a transport level
protocol defined by the IETF Signaling Transport (SIGTRAN) group. As a transport protocol, SCTP
operates like TCP or UDP. Indeed, it provides some services that are similar with TCP - ensuring
reliability or sequential transport for messages, with bottleneck control.
SIP
– Abbreviation for
Session Initiation Protocol
– a protocol proposed as a standard for initiating,
modifying and ending a session that involves multimedia elements such as video, voice, instant
messages, online games and virtual reality. This, along with H.323, is one of the signaling protocols
used for VoIP.
SIP clients frequently use the TCP or UDP port 5060 to connect to IP servers or to other SIP
terminals. First, the SIP protocol is used to initiate and terminate voice or video calls. However, SIP
can be used in any application where an initiation session is required. All voice or video
communication is made separately via transport protocols such as RTP.
SMS
– Abbreviation for
Short Message Service
– involves sending short text messages to/from
mobile phones. The messages must contain only text, without pictures or graphic, and no more than
160 alphanumerical characters. Mobile phone network operators use a separate data channel to send
SMS messages. You can send SMS messages to another mobile subscriber, the operator can send
you various settings via SMS or trading companies can send customized messages for each client.
SNMP
- Abbreviation for
Simple Network Management Protocol
– part of the protocol suite for
internet. SNMP is used in network administration systems, to monitor the peripherals in conditions that
can warrant an administrative attention. It consists of a set of network administration standards,
including application level protocols, a database schema and a data objects set.
SS7
– Abbreviation for
Signaling System 7
– a global telecommunications standard established by
ITU-T. The standard defines the procedures and the protocol through which the elements from the
PSTN (public switched telephone network) exchange information through a digital signaling network in
order to establish wired or wireless calls, routing and control.
The definition that ITU assigned to the SS7 protocol allowed for the development of national standards
such as ANSI (American National Standards Institute) or Bell Communications Research (Telcordia
Technologies), used in North America and ETSI (European Telecommunications Standard Institute),
used in Europe. SS7 represents an architecture for signals to sustain the call establishing, taxing,
routing and data exchange functions of the PSTN public network. It identifies functions performed by a
signaling network and a protocol to activate its performances.
TDM
– Abbreviation for
Time Division Multiplexing
– this is a type of digital multiplexing where two
or more temporal channels are derived from a given frequency specter by intercalating the pulses that
represent bits on different channels.
In some TDM systems, successive pulses represent bytes on successive channels. In other systems,
different channels are switched using the channels from a group of successive temporal pulses (also
known as "time slots"), voice channels in the E1 / T1 systems. The important difference between the
time division multiplexing and packet switching is the fact that time slots are allocated in advance to
different channels.
TUP
– Abbreviation for
Telephone User Part
. Performs the transport of the user's phone message on
the signaling datalink, via signaling units. The signaling information for each message is the signal
data field of the corresponding unit and contains an integer number of bytes. Initially, it contains the
label and one or more signals and/or indications.
VoIP
– Abbreviation for
Voice over IP
. Technology that describes the hardware and software category
that enables human voice calls over internet. Voice signals are converted to data packets which are
then transmitted over public phone networks, avoiding the PSTN network costs. VoIP application can
be used with a microphone and common PC speakers, but they can also be used with IP phones or
VoIP speakers, which provide an experience that is no different from classical telephony. Lately, the
