Glossary of terms


Abbreviation Usage Meaning
Border Gateway Protocol version 4  Dynamic Routing Protocol
Customer Premises Equipment  
Dark Fiber  
Domain Name System
DRRL Digital Radio Relay Line
DS1 Digital Signal 1
DS3 Digital Signal 3
DVB-C Digital Video Broadcasting – Cable
DVB-S Digital Video Broadcasting – Satellite
DWDM Dense Wavelength Division Multiplexing
EoSDH Ethernet over SDH
EPL Ethernet Private Line
EVC Ethernet Virtual Connection =VLAN-id
EVPL Ethernet Virtual Private Line
EVPN Ethernet Virtual Private Network
HDPE High-Density PolyEthylene  Synthetic material used for cable tubes production
IRU Irrevocable Right of Use
ISO International Standardization Organization
LAN Local Area Network
LL Leased Line
MAN Metropolitan Area Network
MSP Multiplex Section Protection
MS-SPRings Multiplex Section Shared Protection Rings
MTTR Mean Time to Recover
MTU Maximal Transmission Unit
NRC Non Recurring Charge
ODF Optical Distribution Frame
OSI Open System Interconnect 7 layer model
PON Passive Optical Network
PoP Point of Presence
QoS Quality of Service
ROADM Reconfigurable Optical Add Drop Multiplexor
SDH Synchronous Digital Hierarchy
SFP Small Form-factor Pluggable
SLA Service Level Agreement
SM Single Mode  
SNCP Sub Network Connection Protection
SONET Synchronous Optical Networking
TT Trouble Ticket
UNI User Network Interface
UTP/FTP Unshielded/Foiled Twisted Pair
VC Virtual Circuit
VLAN-id Virtual LAN identifier (=EVC)
WDM Wavelength Division Multiplexing