
Optical Interface
A component that connects several transmit or receive units.
Optical Time Domain
Reflectometer
A device that sends a very short pulse of light down a fiber optic communication system
and measures the time history of the pulse reflection to measure the fiber length, the light
loss and locate the fiber fault.
orderwire
A channel that provides voice communication between operation engineers or
maintenance engineers of different stations.
OSI
Open Systems Interconnection
OSN
Optical Switch Node
OSPF
Open Shortest Path First
OTDR
Optical Time Domain Reflectometer
OTU
Optical transponder
unit
A device or subsystem that converts the accessed client signals into the G.694.1/G.694.2-
compliant WDM wavelength.
Output optical power
The ranger of optical energy level of output signals.
Overhead
Extra bits in a digital stream used to carry information besides traffic signals. Orderwire,
for example, would be considered overhead information.
A.16 P
Paired slots
Two slots of which the overheads can be passed through by using the bus on the
backplane.
pass-through
The action of transmitting the same information that is being received for any given
direction of transmission.
Path
A performance resource object defined in the network management system. The left end
of a path is a device node whose port needs to be specified and the right end of a path is
a certain IP address which can be configured by the user. By defining a path in the
network management system, a user can test the performance of a network path between
a device port and an IP address. The tested performance may be the path delay, packet
loss ratio or other aspects.
PBS
Peak Burst Size
PC
Personal Computer
PCM
Pulse Code Modulation
PCR
Peak Cell Rate
PDH
Plesiochronous Digital Hierarchy
PDU
PE
A Glossary and Acronyms
OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide
A-22
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 02 (2011-06-30)