Glossary

AAL

ATM Adaptation Layer

ABN

Area Border Node

ABR

Area Border Router

ADM

Add-Drop Multiplexer

AIS

Alarm Indication Signal

AIS-L

Alarm Indication Signal—Line

AIS-P

Alarm Indication Signal—Path

AP

Access Point

APD

Avalanche Photo Diode

APS

Automatic Protection Switching

AS

Autonomous System

ASBR

Autonomous System Border Router

ASE

Amplifier Spontaneous Emission

ASON

Automatic Switched Optical Network

ATM

Asynchronous Transfer Mode

AU-n

Administrative Unit—level n

AUG

Administrative Unit Group

BER

Bit Error Rate

BLSR

Bidirectional Line Switched Ring

BGP

Border Gateway Protocol

BIP

Bit Interleaved Parity

BITS

Building Integrated Timing Supply

CLNP

Connectionless Network Protocol

CMIP

Common Management Information Protocol

CO

Central Office

CORBA

Common Object Request Broker Architecture

CP

Connection Point

CRC

Cyclic Redundancy Check

CR-LDP

Constraint Routed Label Distribution Protocol

DCN

Data Communications Network

DFB

Distributed Feed Back

DHCP

Dynamic Host Configuration Protocol

DNHR

Dynamic Non-Hierarchical Routing

DS-n

Digital Signal—level n

DTL

Designated Transit List

DWDM

Dense Wavelength Division Multiplexing

EDFA

Erbium Doped Fiber Amplifier

EGP

Exterior Gateway Protocol

EMS

Element Management System

E-NNI

Exterior Network-Network Interface

E/O

Electrical to Optical

EOS

End of Sequence

ERO

Explicit Route Object

ESF

Extended Superframe

ES-IS

End System to Intermediate System

FCS

Frame Check Sequence

FEC

Forwarding Equivalency Class

GbE

Gigabit Ethernet

GFP

Generic Framing Procedure

GMPLS

Generalized Multi Protocol Label Switching

GPS

Global Positioning System

HDLC

High-level Data Link Control

HEC

Header Error Check

HOVC

Higher-Order Virtual Concatenation

IETF

Internet Engineering Task Force

IGP

Interior Gateway Protocol

I-NNI

Interior Network-Network Interface

IP

Internet Protocol

IS-IS

Intermediate System to Intermediate System

ISO

International Standards Organization

ISP

Internet Service Provider

ITU-T

International Telecommunication Union—Telecommunications standardization sector

LAN

Local Area Network

LAP-D

Link Access Procedure—D

LAPS

Linear Automatic Protection Switching

LC

Link Connection

LCP

Link Control Protocol

LDP

Label Distribution Protocol

LEC

Local Exchange Carrier

LED

Light Emitting Diode

LIH

Logical Interface Handle

LMP

Link Management Protocol

LOF

Loss of Frame

LOP

Loss of Pointer

LOS

Loss of Signal

LOH

Line Overhead

LOVC

Lower-Order Virtual Concatenation

LSA

Link State Advertisement

LSP

Label Switched Path

LSR

Label Switching Router

LTE

Line Terminating Equipment

MEMS

Micro-Electro-Mechanical Systems

MFI

Multi-Frame Indicator

MIB

Management Information Base

MPLS

Multi Protocol Label Switching

MS

Multiplex Section

MSOH

Multiplex Section Overhead

MTBF

Mean Time Between Failures

MTTR

Mean Time To Repair

NCP

Network Control Protocol

NE

Network Element

NMS

Network Management System

NNI

Network-Network Interface

NUT

Non-preemptible Unprotected Traffic

OA

Optical Amplifier

OC-n

Optical Carrier—level n

O/E

Optical to Electrical

OEO

Optical-Electrical-Optical

OIF

Optical Interworking Forum

OOF

Out Of Frame

OOO

Optical-Optical-Optical

OOK

On-Off Keying

OSI

Open Systems Interconnection

OSPF

Open Shortest Path First

OXC

Optical Cross-connect

PDH

Plesiochronous Digital Hierarchy

PDL

Polarization-Dependent Loss

PDU

Protocol Data Unit

PHY

Physical (layer)

PIN

Positive Intrinsic Negative

PLI

Payload Length Indicator

PLR

Physical Layer Regenerator

PMD

Polarization Mode Dispersion

P-NNI

Private Network-Network Interface

POH

Path Overhead

POP

Point of Presence

POS

Packet over SONET/SDH

PPP

Point-to-Point Protocol

PRS

Primary Reference Source

PSTN

Public Switched Telephone Network

PTE

Path Terminating Equipment

PXC

Photonic Cross-Connect

QOS

Quality of Service

RCD

Routing Control Domain

REI

Remote Error Indicator

RDI

Remote Defect Indicator

RIP

Routing Information Protocol

ROW

Right of Way

RRO

Record Route Object

RS

Regenerator Section

RSOH

Regenerator Section Overhead

RSVP

Resource Reservation Protocol

RSVP-TE

RSVP with Traffic Engineering extensions

RTNR

Real Time Network Routing

SAAL

Signaling ATM Adaptation Layer

SCM

Sub-Carrier Multiplexing

SDH

Synchronous Digital Hierarchy

SLA

Service Level Agreement

SNC

Subnetwork Connection

SNMP

Simple Network Management Protocol

SOH

Section Overhead

SONET

Synchronous Optical Network

SPE

Synchronous Payload Envelope

SPF

Shortest Path First

SRLG

Shared Risk Link Group

SSCOP

Service Specific Connection Oriented Protocol

STE

Section Terminating Equipment

STM-n

Synchronous Transport Module— level n

STS-n

Synchronous Transport Signal— level n

TCM

Tandem Connection Monitoring

TCP

Termination Connection Point; Transmission Control Protocol

TCTE

Tandem Connection Terminating Equipment

TDM

Time Division Multiplexing

TE

Traffic Engineering

TL1

Transaction Language 1

TTP

Trail Termination Point

TU-n

Tributary Unit—level n

TUG-n

Tributary Unit Group—n

UDP

User Datagram Protocol

UML

Unified Modeling Language

UNI

User-Network Interface

UPSR

Unidirectional Path Switched Ring

VC

Virtual Container; Virtual Concatenation

VCG

Virtually Concatenated Group

VT-n

Virtual Tributary—level n

VTG

Virtual Tributary Group

WDM

Wavelength Division Multiplexing