Cisco ONS 15454 SDH E1-75 Podręcznik - Strona 13
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Chapter 11 Circuits and Tunnels
Table 11-5
DCC
Tunnel 2
Tunnel 3
Figure 11-3
Node 1/Slot 3/Port 1 and Node 3/Slot 3/Port 1. Each ONS 15454 SDH node is connected by STM-16
trunk (span) cards. In the example, three tunnel connections are created, one at Node 1 (STM-1 to
STM-16), one at Node 2 (STM-16 to STM-16), and one at Node 3 (STM-16 to STM-1).
A DCC does not function on a mixed network of ONS 15454 SDH nodes and ONS 15454 nodes. DCC
Note
tunneling is required for ONS 15454 SDH nodes transporting data through ONS 15454 nodes.
Figure 11-3
Slot 3 (STM-1)
Port 1, RSDCC
When you create DCC tunnels, keep the following guidelines in mind:
•
Each ONS 15454 SDH can have up to 84 DCC tunnel connections.
Each ONS 15454 SDH can have up to 84 RS-DCC terminations.
•
An RS-DCC that is terminated cannot be used as a DCC tunnel endpoint.
•
An RS-DCC that is used as a DCC tunnel endpoint cannot be terminated.
•
All DCC tunnel connections are bidirectional.
•
An MS-DCC cannot be used for tunneling if a data DCC is assigned.
Note
78-18119-01
DCC Tunnels
SDH Layer
Multiplex Section
Multiplex Section
shows a DCC tunnel example. Third-party equipment is connected to STM-1 cards at
Traditional DCC Tunnel
Link 1
From (A)
To (B)
Slot 13 (STM-16)
Port 1, Tunnel 1
Node 1
Third party
equipment
STM-1
SDH Bytes
4 Ports
D7 to D9
No
D10 to D12
No
Link 2
From (A)
To (B)
Slot 12 (STM-16)
Slot 13 (STM-16)
Port 1, Tunnel 1
Port 1, Tunnel 1
Node 2
Cisco ONS 15454 SDH Reference Manual, R8.5
11.4.1 Traditional DCC Tunnels
STM-4,
STM-16,
8 Ports
STM-64
Yes
Yes
Yes
Yes
Link 3
From (A)
To (B)
Slot 12 (STM-16)
Slot 3 (STM-1)
Port 1, Tunnel 1
Port 1, RSDCC
Node 3
Third party
equipment
11-13