Panasonic 15000 - Manual (Page 139)

- 139 -
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.