Cisco ONS 15454 SDH Spécifications Page 254

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Glossary
GL-24
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
VT
(Virtual Tributary). A structure designed for the transport and switching of sub-DS3 payloads. See also Tributary.
VT1.5
Virtual Tributary that equals 1.544 Mbps.
VT layer
The VT layer or electrical layer occurs when the SONET signal is broken down into an electrical signal.
W
W
Watts.
WAN
Wide Area Network.
Working card
A card that is provisioned as an active, primary card. Traffic cards in a protection pair are provisioned as working or protect
See also Protect card.
X
XC
Cross Connect
XCVT
Cross Connect Virtual Tributary.
X.25
Protocol providing devices with direct connections to a packet-switched network.
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