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Secure Sockets Layer (SSL) — A protocol used by web servers and Web browsers that
creates a uniquely encrypted channel for private communications over the public Internet.
Session Announcement Protocol (SAP) — Used by source devices (encoders or
servers) in conjunction with SDP to publicize the availability of a stream to decoders and
players. Devices using SAP periodically broadcast session description information on an
industry standard multicast address and port. When received by remote clients, these
announcements can be used to facilitate the viewing of streams, eliminating the need for
user configuration.
Session Description Protocol (SDP) — This protocol is used to describe streaming
media initialization parameters. It covers session announcement, session invitation, media
type and format, and other forms of multimedia session initiation (as defined in RFC 2327).
SDP does not deliver media itself. It simply details the stream parameters and how the
stream will be started.
Simple Instruction Set (SIS) — A set of commands developed by Extron that allows for
RS-232, USB, and TCP / IP control of certain Extron products. A command is sent from
the control device to the product (using a minimal number of characters) and a response is
received from the product and shown on the display of the control device.
Simple Network Management Protocol (SNMP) — An application-layer protocol that
facilitates the exchange of management information between network devices. This protocol
collects (and configures) information from network devices (such as servers, hubs, switches,
and routers) on an Internet Protocol (IP) network.
Static IP address — An IP address specifically assigned to a device or system in a
network configuration. This type of address requires manual configuration of the network
device or system and can only be changed manually or by enabling
DHCP
(see page 110).
Stop bits — The bit or bits transmitted that signal the end of a character. Typically set to 1.
Streaming media (stream) — Multimedia that is constantly received by (and normally
presented to) an end-user while being delivered by a streaming provider. Internet television is
a commonly streamed medium.
Switch — A network switch enables communication between devices in a network by
routing data between ports at the data link layer (layer 2 of the OSI model). A managed
switch can be configured to transmit data only to the specific device for which the data was
intended.
Telnet port — Most controllers support Telnet and use port 23 as the communication port
to receive or issue commands.
Transmission Control Protocol (TCP) — A protocol developed for the Internet that
provides reliable end-to-end data packet delivery from one network device to another.
Transmission Control Protocol/Internet Protocol (TCP/IP) — The communication
protocol of the Internet. Computers and devices with direct access to the Internet are
provided with a copy of the TCP/IP program to allow them to send and receive information
in an understandable form.
Time To Live (TTL) — A value that specifies the remaining number of router hops multicast
traffic can make between routed domains. The TTL value is decremented automatically by
each router.
TMDS — Transition Minimized Differential Signaling. An all-digital video transmission
standard developed by Silicon Image, Inc. TMDS is the core technology used in DVI and
HDMI.
Transport Streams (TS) — A form of media wrapper which uses MPEG-2 transport
stream headers. The MPEG-2 transport headers contain information about the media.
The SME is compatible with transport streams that contain H.264 encoded video and
AAC encoded audio. Transport streams containing MPEG-2 video and AC3 audio are not
supported.
SME 211 • Reference Information
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