Glossary
GL-7
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
DS3-12
Digital Signal Level Three (12 ports).
DS3N-12
Digital Signal Level Three (N-12 ports).
DS3XM-6
Digital Service, level 3 Trans-Multiplexer 6 ports.
DSX
(Digital Signal Cross-Connect Frame). A manual bay or panel where different electrical signals are wired. A DSX permits
cross-connections by patch cords and plugs.
DWDM
(Dense Wave Division Multiplexing). A technology that increases the information carrying capacity of existing fiber optic
infrastructure by transmitting and receiving data on different light wavelengths. Many of these wavelengths can be combined
on a single strand of fiber.
E
EDFA
(Erbium Doped Fiber Amplifier). A type of fiber optical amplifier that transmits a light signal through a section of
erbium-doped fiber and amplifies the signal with a laser pump diode. EDFA is used in transmitter booster amplifiers, in-line
repeating amplifiers, and in receiver preamplifiers.
EFCA
Electrical Facility Connection Assembly.
EFT
Electrical Fast Transient/Burst.
EIA
(Electrical Interface Assemblies). Provides backplane connection points for the DS-1, DS-3, and EC-1 cards.
ELR
Extended Long Reach.
EMC
Electromagnetic compatibility.
EMI
(Electromagnetic Interference). Interference by electromagnetic signals that can cause reduced data integrity and increased
error rates on transmission channels.
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