C H A P T E R 6

Timing

This chapter provides information about Cisco ONS 15310-MA SDH timing. To provision timing, refer to the Cisco ONS 15310-MA SDH Procedure Guide.

Chapter topics include:

•6.1 Timing Parameters, page 6-1

•6.2 Network Timing, page 6-2

•6.3 Synchronization Status Messaging, page 6-2

6.1Timing Parameters

Node Timing parameters must be set for each ONS 15310-MA SDH. Each ONS 15310-MA SDH independently accepts its timing reference from one of three sources:

•The building integrated timing supply (BITS) port on the ONS 15310-MA SDH.

•An STM-N/E1 port on the ONS 15310-MA SDH. The port is connected to a node that receives timing through a BITS source.

•The internal G.813/SMC clock on the CTX card.

You can set ONS 15310-MA SDH timing to one of three modes: external, line, or mixed. If timing is coming from the BITS port, set ONS 15310-MA SDH timing to external. If the timing comes from an STM-N and E1 port, set the timing to line. Typical ONS 15310-MA SDH networks have the following timing configurations:

•One node is set to external. The external node derives its timing from a BITS source wired to the CTX port. The BITS source derives its timing from a primary reference source (PRS) such as a Stratum 1 clock or global positioning satellite (GPS) signal.

•The other nodes are set to line. The line nodes derive timing from the externally timed node through the E1 port and STMN trunk (span) port.

You can set three timing references for each ONS 15310-MA SDH. The first two references are typically one BITS-level sources, or two line-level sources optically connected to a node with a BITS source. The third reference is usually assigned to the internal clock provided on every ONS 15310-MA SDH CTX card. However, if you assign all three references to other timing sources, the internal clock is always available as a backup timing reference. The internal clock is a SETS (G.813) in ONS 15310-MA SDH. If a node becomes isolated, timing is maintained at the SETS level.

The CTC Maintenance > Timing > Report tabs show current timing information for an ONS 15310-MA SDH, including the timing mode, clock state and status, switch type, and reference data.

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

 

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6-1

 

 

 

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Cisco Systems 15310-MA manual Timing Parameters
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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.
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