Huawei OptiX OSN 550 Configuration Manual page 468

A Glossary and Acronyms
Transmission Control
Protocol/Internet
Protocol
transparent
transmission
Tray
Tributary loopback
Tributary Protection
Switch
Tributary unit
Tributary Unit Group
TTL
TU
TUG
Tunnel
Type of Service
A.21 U
UART
UAS
UBR
underfloor cabling
UNI
Unprotected
Unprotected sub-
network
A-30
Common name for the suite of protocols developed to support the construction of
worldwide internetworks.
A process during which the signaling protocol or data is not processed in the content but
encapsulated in the format for the processing of the next phase.
A component that can be installed in the cabinet for holding chassis or other devices.
A fault can be located for each service path by performing loopback to each path of the
tributary board. There are three kinds of loopback modes: no loopback, outloop, and
inloop.
A function that uses a standby tributary processing board to protect N tributary
processing boards.
An information structure which provides adaptation between the lower order path layer
and the higher order path layer. It consists of an information payload (the lower order
VC) and a TU pointer which indicates the offset of the payload frame start relative to
the higher order VC frame start.
One or more Tributary Units, occupying fixed, defined positions in a higher order VC-
n payload is termed a Tributary Unit Group (TUG). TUGs are defined in such a way that
mixed capacity payloads made up of different size Tributary Units can be constructed
to increase flexibility of the transport network.
Time To Live
Tributary Unit
See Tributary Unit Group
A channel on the packet switching network that transmits service traffic between PEs.
In VPN, a tunnel is an information transmission channel between two entities. The tunnel
ensures secure and transparent transmission of VPN information. In most cases, a tunnel
is an MPLS tunnel.
A field in an IP packet (IP datagram) used for quality of service (QoS). The TOS field
has 8 bits in length, which is divided into five subfields.
Universal Asynchronous Receiver/Transmitter
Unavailable Second
Unspecified Bit Rate
The cables connected cabinets and other devices are routed underfloor.
See User-to-Network Interface
Pertaining to the transmission of the services that are not protected. The services cannot
be switched to the protection channel if the working channel is faulty or the service is
interrupted, because protection mechanism is not configured.
A sub-network without any protection mechanism. The purpose of such configuration
is to provide the basic data of trail protection for subsequent trail management.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide
Issue 02 (2011-06-30)