Streaming Media Supplement sa2150 and sa2250

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ASF.
(Applies to WMT) ASF stands for Active Streaming Format. A container format for multiple streams of
synchronized media; a Microsoft proprietary specification. ASF is the format for streaming media files with the
extensions.asf,.wma and.wmv.
ASX.
(Applies to WMT) A Microsoft proprietary specification. The format of the WMT metafile, a text file
which contains the URL for an ASF file on an origin Windows Media server. The WMT metafile (ASX file)
may have the extension.asx,.wax or
.wvx
.
Cache.
A system that stores copies of documents near their users, and provides fast access to them, on an
internet.
CDS.
Content Delivery Suite (CDS) is an application from HP that permits administrators to replicate and
synchronize the delivery of all types of content across network servers and caches. CDS provides a means to
preload streaming media files and to make scheduled updates to the cache.
Child.
Node closer to the client in a hierarchical deployment. Child and parent communicate directly. See
“Parent” .
Control protocol.
Protocol that a streaming media format uses to set up and control sessions between client
and origin server. The control channel is one of the two channels needed for media streaming, the other being
the data channel. Relies on an underlying transport protocol, usually TCP. See “Data transfer protocol” .
Clustering.
See “Management-only clustering” and “Full clustering” .
Data transfer protocol.
Protocol that a streaming media format uses to actually stream media data. The data
channel is one of the two channels needed for media streaming, the other being the control channel. The data
transfer protocol itself relies on an underlying transport protocol, usually UDP. See “Control protocol” .
Downstream.
The host closer to the client or consumer of the content. See “Upstream” .
Explicit proxy caching.
Where the client browser is explicitly configured to direct its requests to the proxy
cache. Since the client knows about the proxy cache, the proxy cache is not transparent to the client; so, explicit
proxy caching is also called non-transparent proxy caching. See “Transparent proxy caching” .
Forward proxy caching.
Proxy caching of whatever content is requested by a particular population of web
clients. May be transparent or explicit. See “Reverse proxy caching” .
Full clustering.
Besides sharing configuration information, a Media-IXT cluster distributes its cache across its
nodes, creating a single, virtual object store.
Fully Qualified Domain Name.
A host on the Internet must have a Fully Qualified Domain Name. For
example, somehost.somedomain.com is the FQDN of the host somehost in the domain somedomain
that is within the.com domain.
Hierarchical live splitting.
When a hierarchical deployment of Media-IXT performs live splitting.
Hierarchy.
Two or more Media-IXTs Media-IXTs between client and content. One Media-IXT in the path
between client and content is a single level hierarchy.
Host-embedded filename.
(applies to WMT) The media content URL after Media-IXT has rewritten it. Has
the form:
mms://TRAFFIC_SERVER/ink/rhHTTPHOST/MMSHOST/PATH
In a forward proxy deployment, the host-embedded filename is returned to the client by Media-IXT, as part of
the rewritten WMT metafile. A downstream Windows Media Player client or Media-IXT requests a host-
embedded filename on the MMS port of Media-IXT. See “Media content URL” .
Live content.
Content is live when the origin server has its own internal playlist, and begins playing clips
according to times determined by that playlist; or is streaming content as the content is being encoded (whether
the encoder’s source is really live, like a video camera, or prerecorded, like a video clip being played by another
system). See “On-demand content” .
Glossary