D-4
Cisco ONS 15454 Installation and Operations Guide
November 2001
AppendixD 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 interfac e. DCC can be located in section DCC
(SDCC) or line overhead (LDCC.)
Demultiplex
To separate multiple multiplexed input streams from a common physical signal b ack into multip le output
streams. See also Multiplexing.
Destination
The endpoint where traffic exits an ONS 15454 network. En dpo in ts c an be a pat h ( STS or STS/V T f or
optical card endpoints), port (for electrical circuits, su ch 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 wher e 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 stra nd of f ibe r.
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 w ith a l aser p ump d iode . EDFA is used in
transmitter booster amplifiers, in-line repeating amp lif ier s, an d in re ceiv er pr ea mpl ifi er s.