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List of terms
Nortel Multiservice Switch 7400/15000/20000
Terminology
NN10600-005 7.2S1 Standard
PCR7.2 and up March 2006
Copyright © 2006, Nortel Nortel Confidential
uplink
An uplink is a logical link representing the connectivity from a border node to
an upnode. Uplinks are the basis for horizontal links between nodes.
upnode
An upnode is the node that represents a border nodes’s outside neighbor in
the common peer group. It must be a neighboring peer of one of the border
node’s ancestors.
usage parameter control (UPC)
A traffic management strategy that enforces traffic characteristics at network
access points. UPC evaluates a connection’s traffic characteristics based on
the traffic descriptor parameters for that connection, and discards or tags non-
conforming cells.
user datagram protocol (UDP)
A simple datagram protocol. UDP is layered directly above the Internet
protocol (IP). This protocol does not provide for acknowledging packets or
error checking. It has a high data rate but is unreliable for accurately delivering
packets.
user-to-network interface (UNI)
1 The frame relay service is provided through a standard interface between
the user device and the network, called the user-to-network interface. For
more information, see the document NN10600-900 Nortel Multiservice
Switch 7400/15000/20000 Frame Relay Technology Fundamentals.
2 An interface between ATM user equipment and ATM network equipment.
UTC
See Coordinated Universal Time (UTC) (page 35).
UTP
Unshielded twisted pair (a type of cable).
UTP
See universal trunk protocol (UTP) (page 138).
V.11
A ITU-T standard that specifies electrical signal levels for data interfaces. V.11
is used by many physical interfaces such as V.36, V.37, RS-449, and X.21.
Nortel Multiservice Switch system V.11 FP provides an X.21 physical
interface.
V.35
A standard ITU-T DCE-DTE physical interface for data communication.