Cisco ONS 15327 User Documentation page 528

Glossary
Crosspoint
A set of physical or logical contacts that operate together to extend the speech and signal channels in a switching network.
CTAG
Correlation tag. A unique identifier given to each input command by the TL1 operator. When an ONS 15327 or ONS 15454
system responds to a specific command, it includes the command's CTAG in the reply. This eliminates discrepancies about
which response corresponds to which command.
CMS
The previous name of the Cisco Transport Controller (CTC).
CTC
Cisco Transport Controller. A Java-based program that allows a user to provision and manage ONS 15327s and ONS 15454s
using an Internet browser.
CTM
Cisco Transport Manager. A Java-based network management tool used to support large networks of Cisco 15000-class
equipment.
D
DCC
Data communications channel. Used to transport information about operation, administration, maintenance, and provisioning
(OAM&P) over a SONET interface. DCCs can be located in section DCC (SDCC) or line overhead (LDCC).
Demultiplex
Separates multiple multiplexed input streams from a common physical signal back into multiple output streams. See also
Multiplexing.
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 form of fiber optical amplification 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 15327 User Documentation, R3.3
GL-4
June 2002