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This is the main glossary available in all courses.


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U

U-APSD

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U-APSD an acronym for Unscheduled - Automatic Power Save Delivery (also known as WMM Power Save) is an IEEE 802.11e specification for power management method used for VoWiFi applications, that enables to save power while bidirectional data exchange like RTP streams on VoIP WLAN handsets.

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UC

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UC is an acronym for Unified Communications. It is an umbrella term for an ever evolving set of real time communication functions like chat, presence, call control, video conferencing and collaboration which in combination with unified messaging (fax, sms, voice mail, e-mail) aims to enhance business processes.

wikipedia.ico Unified communications
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UNC Path

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Acronym for Universal Naming Convention. Provides a uniform syntax to describe the name of a network resource such as a file.

In Microsoft Windows, the syntax looks like \\host\share\path\file. host usually denotes the name of a network server. share denotes an entry point to the servers file system that has been made available to network users and path\file is the path to the resource blow that entry point.

For innovaphone boxes that have a WebDAV service (e.g. to provide access to the devices local CF card), you would use the devices ip address as host, drive as share and cf0\dir\file as path, e.g. \\172.16.0.10\drive\cf0\log\LOG0.0.txt.

Uninterruptible Power Supply

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An uninterruptible Power Supply (UPS) provides protection against system outages caused by loss of power. Usually, key components (such as gateways and telephones in a VoIP system) will be powered by PoE from a switch which is in turn secured by an UPS. This makes for a highly available system setup with minimal extra invest in the IT infrastructure.

wikipedia.ico Uninterruptible power supply

UPS

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Acronym for Uninterruptible Power Supply.

URL

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Uniform Resource Locator (URL) specifies where an identified resource is available and the mechanism for retrieving it.

wikipedia.ico Uniform Resource Locator

User to User Information

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User to User Information is an additional signalling information sent from User to User(in contrast to User to Network information) and is provided by User-to-User Signalling supplementary service and is supported by innovaphone in ISDN DSS1, H.225 and SIP.
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