Chapter 7 Circuits and Tunnels

7.3 Cross-Connect Card Bandwidth

7.3 Cross-Connect Card Bandwidth

The single shelf cross-connect card (SSXC) cross-connect cards perform port-to-port, time-division multiplexing (TDM). The STS matrix has the capacity for 6144 STS terminations. Because each STS circuit requires a minimum of two terminations, one for ingress and one for egress, the SSXC has a capacity for 3072 STS circuits. However, this capacity is reduced at path protection and 1+1 nodes because three STS terminations are required at circuit source and destination nodes and four terminations are required at 1+1 circuit pass-through nodes. path protection pass-through nodes only require two STS terminations.

7.4 DCC Tunnels

SONET provides four data communications channels (DCCs) for network element operations, administration, maintenance, and provisioning: one on the SONET Section layer (DCC1) and three on the SONET Line layer (DCC2, DCC3, DCC4). The ONS 15600 uses the Section DCC (SDCC) for ONS 15600 management and provisioning. An SDCC and Line DCC (LDCC) each provide 192 Kbps of bandwidth per channel. The aggregate bandwidth of the three LDCCs is 576 Kbps. You can tunnel third-party SONET equipment across ONS 15600 networks using one of two tunneling methods, a traditional DCC tunnel or an IP-encapsulated tunnel.

7.4.1 Traditional DCC Tunnels

In traditional DCC tunnels, you can use the three Line DCCs (LDCCs) and the SDCC (when not used for ONS 15600 DCC terminations). A 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, connect the tunnel endpoints from one ONS 15600 optical port to another. Table 7-5lists the DCC tunnels that you can create.

Table 7-5

DCC Tunnels

 

 

 

DCC

SONET Layer

SONET Bytes

 

 

 

DCC1

Section

D1 to D3

 

 

 

DCC2

Line

D4 to D6

 

 

 

DCC3

Line

D7 to D9

 

 

 

DCC4

Line

D10 to D12

 

 

 

When you create DCC tunnels, keep the following guidelines in mind:

•Each ONS 15600 can have up to 64 DCC tunnel connections.

•An SDCC that is terminated cannot be used as a DCC tunnel endpoint.

•An SDCC that is used as an DCC tunnel endpoint cannot be terminated.

•All DCC tunnel connections are bidirectional.

Cisco ONS 15600 Reference Manual, R7.2

7-12

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Cisco Systems ONS 15600 manual Cross-Connect Card Bandwidth, Traditional DCC Tunnels, Sonet Bytes
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ONS 15600 specifications

Cisco Systems ONS 15600 is a highly versatile optical networking platform designed to meet the demands of modern telecommunications and data services. This multiservice edge platform supports various transmission mediums and offers a wide array of features that enable efficient data transport. Ideal for service providers and large enterprises, the ONS 15600 is engineered to provide scalable and reliable optical transport solutions.

One of the notable features of the ONS 15600 is its capability to support multiple protocols, including SONET/SDH, Ethernet, OTN, and legacy TDM services. This flexibility allows users to tailor their networks according to specific service requirements while ensuring interoperability with existing infrastructure. The platform is designed to facilitate seamless service migration, accommodating both legacy and next-generation services.

The modular architecture of the ONS 15600 enhances its scalability. It allows for easy expansion by incorporating additional line cards or interface modules without requiring significant downtime. This modularity ensures that service providers can evolve their networks over time, responding to increasing bandwidth demands and new service offerings with ease.

Incorporating advanced technologies, the ONS 15600 employs Dense Wavelength Division Multiplexing (DWDM), significantly increasing the capacity of fiber networks by allowing multiple signals to be transmitted simultaneously over a single optical fiber. This capability helps to optimize fiber utilization and reduce operational costs. In addition, the platform supports Optical Transport Network (OTN) for improved error detection and correction, contributing to higher reliability and performance.

Another key characteristic of the ONS 15600 is its robust management capabilities. The platform can be managed through Cisco's Optical Networking Manager (ONM), providing a centralized interface for network configuration, monitoring, and troubleshooting. This enhances operational efficiency and minimizes downtime, allowing service providers to focus on delivering quality services to their customers.

The ONS 15600 also prioritizes security, offering various features like encryption and access control to safeguard sensitive data during transmission. With its combination of scalability, flexibility, and security, the Cisco ONS 15600 stands out as a reliable choice for organizations looking to enhance their optical networking capabilities while meeting the evolving demands of the digital landscape. Its commitment to quality and performance makes it a cornerstone of modern optical networks.
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