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Chapter 6
Circuits and Tunnels
sufficient capacity, CTC displays a dialog box asking whether you want to create a tunnel. Before you
create the tunnel, review the existing tunnel availability, keeping in mind future bandwidth needs. In
some cases, you may want to manually route a circuit rather than create a new tunnel.
6.9 Creating DCC Tunnels
SONET provides four data communications channels (DCCs) for network element operations,
administration, maintenance, and provisioning: one on the SONET Section layer and three on the
SONET Line layer. The ONS 15454 uses the Section DCC (SDCC) for ONS 15454 management and
provisioning.
You can use the Line DCCs (LDCCs) and the SDCC (when the SDCC is not used for ONS 15454 DCC
terminations) to tunnel third-party SONET equipment across ONS 15454 networks. A DCC tunnel
end-point is defined by Slot, Port, and DCC, where DCC can be either the SDCC, Tunnel 1, Tunnel 2,
or Tunnel 3 (LDCCs). You can link an SDCC to an LDCC (Tunnel 1, Tunnel 2, or Tunnel 3), and an
LDCC to an SDCC. You can also link LDCCs to LDCCs and link SDCCs to SDCCs. To create a DCC
tunnel, you connect the tunnel end points from one ONS 15454 optical port to another.
Each ONS 15454 can support up to 32 DCC tunnel connections.
you can create.
Table 6-6
DCC
SDCC
Tunnel 1
Tunnel 2
Tunnel 3
Figure 6-15
1/Slot 3/Port 1 and Node 3/Slot 3/Port 1. Each ONS 15454 node is connected by OC-48 trunk cards. In
the example, three tunnel connections are created, one at Node 1 (OC-3 to OC-48), one at Node 2 (OC-48
to OC-48), and one at Node 3 (OC-48 to OC-3).
November 2001
DCC Tunnels
SONET
SONET
Layer
Bytes
Section
D1 - D3
Line
D4 - D6
Line
D7 - D9
Line
D10 - D12 No
shows a DCC tunnel example. Third-party equipment is connected to OC-3 cards at Node
Table 6-6
OC-3
OC-12, OC-48
(all ports)
Yes
Yes
No
Yes
No
Yes
Yes
Cisco ONS 15454 Installation and Operations Guide
Creating DCC Tunnels
shows the DCC tunnels that
6-21
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