Overhead Circuit Types


The following table shows the overhead circuit types that might appear in the Type column of the Overhead Circuits tab.

Type

Description

User Data - F1

User data channel provisioned on the F1 overhead byte.

User Data - D4-D12

User data channel provisioned on the multiplex section (or Line) DCC channels (D4-D12).

Local Orderwire

Local orderwire circuit.

Express Orderwire

Express orderwire circuit.

DCC Tunnel - D1-D3

DCC tunnel provisioned on the regenerator section DCC channel (D1-D3) to transport traffic from third-party SDH equipment across ONS node networks.

DCC Tunnel - D4-D12

DCC tunnel provisioned on the multiplex section (or Line) DCC channels (D4-D12).

IP Tunnel - D1-D3

IP tunnel on the regenerator section DCC (D1-D3).