Alcatel-Lucent 1830 PSS-16 Maintenance And Trouble-Clearing User Manual page 719

Glossary
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A minimal, datagram-oriented, transport network protocol above the IP network layer that does
not guarantee data ordering or delivery. Because it is datagram-oriented, each send operation by
the application results in the transmission of a single IP datagram. This contrasts with the
Transmission Control Protocol (TCP) which is byte stream oriented and guarantees the delivery
and ordering of the bytes sent. Because it is a byte stream oriented, a single send operation may
result in a no IP datagrams (buffering), a single IP datagram, or multiple IP datagrams.
user services
Services that the network provider can sell to their customers, such as Ethernet service.
UTC
Coordinated universal time.
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V variable optical attenuator (VOA)
A device used to set the attenuation of the power received over a fiber to a level required by the
receiving equipment.
VCAT
See "virtual concatenation" (p. GL-31)
very short reach (VSR)
A SONET/SDH interface that provides a low-cost interconnection solution of less than 300
meters between routers, switches, and DWDM systems.
virtual concatenation (VCAT)
Defines an inverse multiplexing procedure whereby the contiguous bandwidth is broken into
individual Virtual Containers (VC) at the source transmitter and logically represented in a Virtual
Concatenation Group (VCG). VCG members are transported as individual VCs across the
SONET/SDH network and recombined at the destination VCG receiver. While contiguous
concatenation requires concatenation functionality at each network element, virtual concatenation
do not.
virtual time-slot (VTS)
1830 PSS-1 GBE Edge Device has a fixed assignment of 10 Virtual Time Slots to each line port.
VOA
See "variable optical attenuator" (p. GL-31)
VSR
See "very short reach" (p. GL-31)
VTS
See "virtual time-slot" (p. GL-31)
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1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
for definition.
for definition.
for definition.
for definition.
GL-31