Table 11-8 Dcc Tunnels; Traditional Dcc Tunnels; Figure - Cisco 15454-DS1-14= - 1.544Mbps Expansion Module Reference Manual

Chapter 11 Circuits and Tunnels

11.5.1 Traditional DCC Tunnels

In traditional DCC tunnels, you can use the three LDCCs and the SDCC (when not used for ONS 15454
DCC terminations). A traditional DCC tunnel endpoint is defined by slot, port, and DCC, where DCC
can be either the SDCC or one of the LDCCs. You can link LDCCs to LDCCs and link SDCCs to SDCCs.
You can also link an SDCC to an LDCC, and an LDCC to an SDCC. To create a DCC tunnel, you connect
the tunnel endpoints from one ONS 15454 optical port to another. Cisco recommends a maximum of
84 DCC tunnel connections for an ONS 15454.
using different OC-N cards.
Table 11-8
Card
OC3 IR 4/STM1 SH 1310
OC3 IR/STM1 SH 1310-8; all
OC-12, OC-48, and OC-192 cards

Figure 11-5

Node 1/Slot 3/Port 1 and Node 3/Slot 3/Port 1. Each ONS 15454 node is connected by OC-48 trunk
(span) 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).
Figure 11-5
From (A)
Slot 3 (OC3)
Port 1, SDCC
When you create DCC tunnels, keep the following guidelines in mind:
•
•
•
•
78-18106-01
DCC Tunnels
shows a DCC tunnel example. Third-party equipment is connected to OC-3 cards at
Traditional DCC Tunnel
Link 1
To (B)
Slot 13 (OC48)
Port 1, Tunnel 1
Node 1
Third party
equipment
Each ONS 15454 can have up to 84 DCC tunnel connections.
Each ONS 15454 can have up to 84 Section DCC terminations.
A SDCC that is terminated cannot be used as a DCC tunnel endpoint.
A SDCC that is used as an DCC tunnel endpoint cannot be terminated.
Table 11-8 shows the DCC tunnels that you can create
DCC SONET Layer
DCC1 Section
DCC1 Section
DCC2 Line
DCC3 Line
DCC4 Line
Link 2
From (A) To (B)
Slot 12 (OC48) Slot 13 (OC48)
Port 1, Tunnel 1 Port 1, Tunnel 1
Node 2
Cisco ONS 15454 Reference Manual, R8.5
11.5.1 Traditional DCC Tunnels
SONET Bytes
D1 - D3
D1 - D3
D4 - D6
D7 - D9
D10 - D12
Link 3
From (A) To (B)
Slot 12 (OC48) Slot 3 (OC3)
Port 1, Tunnel 1 Port 1, SDCC
Node 3
Third party
equipment
11-17