A

Bit Error Rate switching threshold

Alternate Current

Add Drop Multiplexer

Alarm Indication Signal (1111...)

Automatic Protection Switching

Administrative Unit

Auxiliary Pattern (1010...)

B

Back-to-back

Battery

Bit Error Ratio

Bi-Directional Loopback Alarm

C

Command Line Interface

Connection less Network Protocol

Central Office

Method for detection of bit errors (ITU-T Rec. G.704)

D

Direct Current

Data Communications Channel

Data Circuit-terminal Equipment

Data Communications Network

Downlink (towards user)

Degraded Laser

Degraded Quality on User Interface

Data Terminal Equipment

E

Equipment Craft Terminal

Engineering Order Wire

Electrical Erase Programmable Read Only Memory

Electromagnetic Compatibility

Erase Programmable Read Only Memory

End System

Errored Seconds

Exchange Termination

European Telecommunication Standards Institute

F

Optical line interface

Electrical 2 Mbit/s interface

Frame Alignment

Failure Condition

Optical Connector

Fabry Perot

Field Programmable Gate Array

File Transfer Protocol

G

Graphical User Interface

H

High Bit Error Rate

High Density Binary Code

High-level Data Link Control

Hardware

I

ICMP

Internet Control Message Protocol

IGMP

Internet Group Management Protocol

IEEE

Institute of Electrical and Electronics Engineers

IP

Internet Protocol

IS

Intermediate System

ISDN

Integrated Services Digital Network

ITU-T

International Telecommunication Union Standardization Bureau

K

Numbering scheme for container in SDH

L

Link Access Procedure on the D channel

Local Area network

Low Bit Error Rate

VT.100 compatible Local Craft Terminal

Laser Diode

Light Emitting Diode

Loss of Frame (BF) Alignment

Local Loop 2/3

Loss of Multiframe Alignment

Loss of Signal

Line Protection Switching

Line Termination Equipment

M

Medium Access

Mediation Device

Multiframe (G.704)

Management Information Base

Multiplex Section

N

Not Connected

Network Element

Network

Network Service Access Point

Network Termination Equipment

Non-Volatile

O

Operating Center

Office Craft Terminal

Optical Distribution Frame

Optical Fibre Digital Line System (Associated LTE, NTE and fibre route)

Optical LOS

Optical Power out of Limit

Optical interface module RX

Open Systems Interconnection

Optical interface module TX

P

Private Automatic Branch Exchange

Personal Computer

Printed Circuit Board

Plesiochronous Digital Hierarchy (ITU-T Rec. G.702)

R

Restricted Access Location

optical receiver

T

Technical Assistance Center

Transport Control Protocol

Telecommunication Industry Association

optical transmitter

W

World Wide Web