Cisco ONS 15454 SDH Specifications Page 485

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Glossary
GL-23
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
UID
User Identifier.
Unicast
The communication of a single source to a single destination.
UPSR
(Unidirectional Path Switched Ring). Path-switched SONET rings that employ redundant, fiber- optic transmission facilities
in a pair configuration. One fiber transmits in one direction and the backup fiber transmits in the other. If the primary ring fails,
the backup takes over. See also BLSR.
Upstream
Set of frequencies used to send data from a subscriber to the head end.
UTC
Universal-Time Coordinated.
UTP
Unshielded Twisted Pair.
V
VDC
Volts Direct Current.
Virtual fiber
A fiber that carries signals at different rates and uses the same fiber optic cable.
Virtual ring
Entity in a source-route bridging (SRB) network that logically connects two or more physical rings together either locally or
remotely. The concept of virtual rings can be expanded across router boundaries.
Virtual wires
Virtual wires route external alarms to one or more alarm collection centers across the SONET transport network.
VLAN
(Virtual LAN). Group of devices located on a number of different LAN segments that are configured (using management
software) to communicate as if they were attached to the same wire. Because VLANs are based on logical instead of physical
connections, they are extremely flexible.
VPN
(Virtual Private Network). Enables IP traffic to travel securely over a public TCP/IP network by encrypting all traffic from one
network to another. A VPN uses tunneling to encrypt all information at the IP level. See also Tunneling.
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