Glossary
GL-6
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
CTM
(Cisco Transport Manager). A Java-based network management tool used to support large networks of Cisco 15000-class 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 SDCC or LDCC. See also LDCC and SDCC.
DCN
Data Communications Network.
DCS
Distributed Communications System.
Default router
If the ONS 15454 must communicate with a device on a network to which the ONS 15454 is not connected, packets are sent
to this router to be distributed.
Demultiplex
To separate multiple multiplexed input streams from a common physical signal back into multiple output streams. Compare
Multiplexing.
Destination
The endpoint where traffic exits an ONS 15454 network. Endpoints can be paths (STS or STS/VT for optical card endpoints),
ports (for electrical circuits, such as DS1, VT, DS3, STS), or cards (for circuits on DS1 and Ethernet cards). See also STS, and
VT.
DRAM
Dynamic Random-Access Memory.
Drop
See Destination.
DS-1
Digital Signal Level One.
DS1-14
Digital Signal Level One (14 ports).
DS1N-14
Digital Signal Level One (N-14 ports).
DS-3
Digital Signal Level Three.
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