Chapter 7 Circuits and Tunnels

VC-12 Bandwidth

Right-click a node, port, or span on the detailed circuit map to initiate certain circuit actions:

Right-click a unidirectional circuit destination node to add a drop to the circuit.

Right-click a port containing a path-trace-capable card to initiate the path trace.

Right-click a linear multiplex section protection span to change the state of the path selectors in the linear multiplex section protection circuit.

7.3VC-12 Bandwidth

The 15310E-CTX-K9 in the ONS 15310-MA SDH performs port-to-port time-division multiplexing (TDM). The VC low-order path matrix for the 15310E-CTX-K9 has 96 logical VC high-order path ports. All VC-12 multiplexing is achieved through these logical VC high-order path ports. Although the 15310E-CTX-K9 can support up to 2016 VC-12 cross-connects and 1344 bidirectional VC low-order path circuits, the maximum number of VC12s that can be provisioned for Software Release 9.1 and 9.2 is 2016 VC 12 low-order path cross-connects and 1008 bidirectional VC12 low-order path circuits.

To view VC low-order path matrix resource usage, use the Maintenance > Cross-connect > Resource Usage subtabs.

7.4 VC Low-order Path Tunnels and Aggregation Points

To maximize VC-12 cross-connect resources, you can tunnel VC-12 circuits through ONS 15310-MA SDH nodes. VC-12 tunnels do not use VC low-order path matrix capacity at pass-through nodes, thereby freeing the cross-connect resources for other VC-12 circuits.

VC low-order path aggregation points (VAPs) allow you to provision circuits from multiple VC-12 sources to a single VC high-order path destination. Like circuits, a LAP has a source and a destination. The source is the VC high-order path grooming end, the node where the VC-12 circuits are aggregated into a single VC high-order path. The LAP VC high-order path must be an STMn port. VC low-order path matrix resources are not used on the LAP source node, which is the key advantage of VAPs. The LAP destination is the node where the VC-12 circuits originate. Circuits can originate on any ONS 15310-MA SDH card or port.

7.5 DCC Tunnels

Each SDH frame provides four DCCs for network element (NE) Operations, Administration, Maintenance, and Provisioning (OAM&P): one on the SDH Section layer (DCC1) and three on the SDH Line layer (DCC2, DCC3, DCC4). The ONS 15310-MA SDH use the Section DCC (RS-DCC) or Line DCC (MS-DCC) for management and provisioning. When multiple DCC channels exist between two neighboring nodes, the ONS 15310-MA SDH balances traffic over the existing DCC channels using a load-balancing algorithm. This algorithm chooses a DCC for packet transport by considering packet size and DCC utilization. You can tunnel third-party SDH equipment across ONS 15310-MA SDH networks using one of two tunneling methods, a traditional DCC tunnel or an IP-encapsulated tunnel.

Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2

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Cisco Systems 15310-MA manual VC-12 Bandwidth, VC Low-order Path Tunnels and Aggregation Points, DCC Tunnels

15310-MA specifications

Cisco Systems has established itself as a leader in the networking domain, offering a wide array of solutions to meet the needs of modern businesses. Among its impressive product lineup are the Cisco 15310-CL and 15310-MA routers, designed to provide advanced network performance and reliability.

The Cisco 15310-CL is a versatile platform that primarily serves as a carrier-class router aimed at supporting high-speed data and voice services. It is built to handle the demands of large enterprises and service providers, offering a robust design that ensures maximum uptime and performance. One of its standout features is its modular architecture, which enables users to customize their configurations based on specific application needs. This scalability allows for future expansion without the need for a complete hardware overhaul.

Key technologies integrated into the Cisco 15310-CL include high-density Ethernet interfaces and a comprehensive suite of Layer 2 and Layer 3 protocol support. The device is capable of supporting multiple types of connections, including TDM, ATM, and Ethernet. This flexibility makes it an ideal choice for organizations that require seamless migration between various service types. Moreover, with features such as MPLS (Multiprotocol Label Switching) support and advanced Quality of Service (QoS) mechanisms, the router ensures that critical applications receive the necessary bandwidth and low latency required for optimal performance.

In contrast, the Cisco 15310-MA focuses on access solutions, providing a cost-effective entry point for businesses looking to enhance their network capabilities. It is well-suited for smaller offices or branch locations that need reliable connectivity without the expense and complexity associated with larger systems. The device supports a range of access methods and provides essential features like firewall capabilities, VPN support, and comprehensive security measures to protect sensitive data.

Both models benefit from Cisco's commitment to security and manageability, offering features like enhanced encryption protocols and user authentication mechanisms that help safeguard networks against threats. Additionally, they can be managed through Cisco’s intuitive software tools, simplifying configuration and monitoring tasks for IT administrators.

The Cisco 15310-CL and 15310-MA are ideal solutions for businesses seeking to enhance their network infrastructure, ensuring firms can keep pace with evolving technology demands while maintaining a focus on security and performance. Their combination of advanced features, modular capabilities, and robust support makes them valuable assets in the networking landscape.