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Appendix D
Glossary
CTC
Cisco Transport Controller. A Java-based graphical user interface (GUI) that allows operations,
administration, maintenenance, and provisioning (OAM&P) of the ONS 15454 using an Internet
browser.
CTM
Cisco Transport Manager. A Java-based network management tool used to support large networks of
Cisco 15000-class equipment.
CV
code violation
D
DCC
Data Communications Channel. Used to transport information about operation, administration,
maintenance, and provisioning (OAM&P) over a SONET interface. DCC can be located in section DCC
(SDCC) or line overhead (LDCC.)
Demultiplex
To separate multiple multiplexed input streams from a common physical signal back into multiple output
streams. See also Multiplexing.
Destination
The endpoint where traffic exits an ONS 15454 network. Endpoints can be a path (STS or STS/VT for
optical card endpoints), port (for electrical circuits, such as DS1, VT, DS3, STS), or card (for circuits on
DS1 and Ethernet cards).
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.
Cisco ONS 15454 Installation and Operations Guide
D-4
November 2001
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