23 U
U
Rack Unit
In its strictest sense, a rack unit (U) is a unit of measure that describes the height of a component mounted in a standard 19-inch rack. One rack unit (1U) is 44.45 mm (1.75 in) high. In this example, a “standard 44U frame” refers to the amount of vertical space occupied by this 19 inch-wide frame, which is 77.0 (1.75 inches x 44) inches high.
UA
ETF User Adaptation Layers
User Agent
UAA
User Authorization Answer (Diameter Cx)
UAC
User Agent Client
UAL
User Application Layer
UAM
Unsolicited Alarm Message
A message sent to a user interface whenever there is a fault that is service-affecting or when a previous problem is corrected. Each message has a trouble code and text associated with the trouble condition.
UAPS
UA Parameter Set
UAR
User Authorization Request (Diameter Cx)
UART
Universal Asynchronous Receiver Transmitter
UAS
User Agent Server
UBA
Unblocked Acknowledgement
UCIC
Unequipped Circuit Identification Code
Unidentified Circuit Identification Code
UCP
Universal Computer Protocol
Protocol used to connect to SMSCs.
UCS-2
2-byte Universal Character Set
UCS-2 coded SMS contains a maximum of 70 characters. It is in use in countries that needs more then the standard 7/8 bit to code their character set. Each character is represented by 2 bytes.
UDA
User-Data-Answer
Sent by a server in response to the User-Data-Request command.
UDM
User Defined Messages
UDP
User Datagram Protocol
UDR
User Data Repository. A logical entity containing user data.
User-Data-Request. A user-identity and service indication sent by a Diameter client to a Diameter server to request user data.
UDRBE
UDR Back End
UDRFE
UDR Front End
UDSA
User Defined Stop Action
UDT
Unitdata Transfer
UDTS
Unitdata Transfer Service
An error response to a UDT message.
UE
User Equipment
UG
User Guide
UHC
Upgrade Health Check
UI
User Interface
UIAS
User Interface Application Side
UID
User ID
UIM
Unsolicited Information Message. A message sent to a user interface whenever there is a fault that is not serviceaffecting or when a previous problem is corrected. Each message has a trouble code and text associated with the trouble condition.
Unified Inventory Management
UIMRD
UIM Redirect
UIS
User In Service
UISC
User Interface Session Control
UITS
User Interface Terminal Side
UL
Underwriters Laboratories
ULA
Update Location Answer
ULP
Upper Layer Protocol
ULR
Update Location Request
UMA
Unlicensed Mobile Access
A technology comparable with the activities of IEEE 802.21. UMA supports roaming and handover between cellular networks, GSM, GPRS, Bluetooth, and 802.11 type WLANs. UMA vendors do not guarantee interoperability.
UMTS
Universal Mobile Telecommunications System
The standard for 3G used by GSM service providers. UMTS includes voice and audio services, for fast data, graphic and text transmissions, along with transmission of moving images and video.
Unchannelized E1
Synchronous E1 High Speed Link
Unchannelized T1
Synchronous T1 High Speed Link
UNI
User-Network Interface
Unique Connection
A connection established that can be deterministically mapped to a Diameter configured connection.
Universal License Key
A license key that works on any OAP. This key is not dependant on the unique host ID of the machine.
UNKN
FNAI class Unknown
Unsolicited Alarm Message (UAM)
See UAM
Unsolicited Information Message
See UIM
Untrusted Network
A Diameter network which has topology information hidden by the Topology Hiding features.
UOS
User Out of Service
UPA
UltraSPARC Port Architecture
User Part Available
UPD
Update
User Datagram Protocol. The User Datagram Protocol is one of the core protocols of the Internet protocol suite. Using UDP, programs on networked computers can send short messages sometimes known as datagrams to one another.
Upgrade
A stage in the lifecycle of a Virtual Network Function (VNF) or a network service (NS) that updates, upgrades, or maintains the VNF or service (support VNF software and/or configuration changes of various complexity).
UPL
User Program Layer
Uplink Set
A pair of egress fabric links used to connect the T5100 platform with the customer. The pair functions as an active/backup high-availability link.
UPLU
User Program Layer Utilities
Upstream
The direction of a particular Diameter message from the Diameter client toward the home server.
Upstream Peer
Diameter Node to which Request messages are forwarded.
UPT
User Part Test
UPU
User Part Unavailable
An MTP3 management message.
URI
Uniform Resource Identifier
An internet protocol element consisting of a short string of characters that conform to a certain syntax. The string comprises a name or address that can be used to refer to a resource.
URK
Unregistered Routing Key
URL
Uniform Resource Locator
USB
Universal Serial Bus
USB Port
Receptacle for flash memory drives on personal computers. On the E5-MDAL card, a flush-mounted USB port used with credit card flash memory drives for upgrade. On the E5-MCAP card, a latched USB port for use with flash memory ”thumb” drives for installation and backup of customer data.
U-SBR
Universal SBR
USDA
User Defined Stop Action
User-Configurable Parameter
A user-configurable parameter is a configuration parameter that can be modified by the operator using a standard user interface. In general, when a user-configurable parameter is modified, the configuration change will take effect immediately without restarting the software, unless specified otherwise.
User Datagram Protocol
The User Datagram Protocol is one of the core protocols of the Internet protocol suite. Using UDP, programs on networked computers can send short messages sometimes known as datagrams to one another.
User Data Repository
See UDR
User Local Time
Local time of a UE that is calculated as an offset from UTC for the location of a UE.
User Local Time Context
Indicates that user local time is to be applied to policy rules.
USIS
User-to-User Indicators
USL
User Systems Language
USM
User Security Management
USR
User-to-User information
USSD
Unstructured Supplementary Service Data
UTC
Coordinated Universal Time
UTF-8
Variable-length character encoding for Unicode that is backward-compatible with ASCII.
Utility
The application that is used by the factory for testing. This application has no use in the field.
UTP
Unit Test Plan
Untwisted Pair