Data communication channels
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Data Communication Channels (DCC)
The Data Communication Channels (DCC) are part of the Data Communications
Network (DCN). The channels are used to exchange management data between the
management system and the Network Elements. The channels are also used for
communication between the different Network Elements (for example remote logins).
DCC channels (D1 - D12) are provided by reserved bytes in the regenerator section
(RS) and the multiplexer section (MS) overhead of the STM-N signal.
Transparent DCC
The Transparent DCC Cross-Connect feature allows to transparently pass-through
certain DCC channels which cannot or should not be processed by the system.
Transparent DCC Cross-Connect are to be used when there is a router on one side of
the SDH/SONET network which uses the DCC to transport some IP-based protocol to
a router on the other side of the network. This feature can be used to avoid
interworking with equipment from a different vendor in a common routing domain.
The Transparent DCC Cross-Connect path is transparent. This means that no
processing at all will be done as the data travels along the path. Therefore, the entire
Transparent DCC Cross-Connect path counts as a single hop for the network elements
at the ends of the path.
The Transparent DCC Cross-Connections are completely independent from the
Transmission Cross-Connections. There is no relation between the number of ″normal″
(terminated) DCC channels and the number of Transparent DCC channels. They are
taken from different pools.
Therefore, enabling a ″normal″ (terminated) DCC channel does not reduce the number
of available Transparent DCC channels, and vice versa.
For each DCC channel, Transparent DCC Crossconnection and traditional DCC
processing on the CTL/DCF are mutually exclusive.
Functional requirements
The following functional requirements to the transparent DCC channels:
• the number of bidirectional transparent DCC channels is limited to 25.
• it is possible to use transparent DCC cross-connect for RS-DCC and MS-DCC.
Establishing Transparent DCC Crossconnection
Transparent DCC cross connection are to be established by identification of the two
ports of an NE that are to be cross-connected and the DCC type (RS-DCC or
MS-DCC).
Management communication setup
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365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
4-15
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