Chapter 1 General Troubleshooting

1.1 Network Troubleshooting Tests

•1.9 CTC Operation Troubleshooting—Provides troubleshooting procedures for Cisco Transport Controller (CTC) login or operation problems.

•1.10 Circuits and Timing—Provides troubleshooting procedures for circuit creation and error reporting as well as timing reference errors and alarms.

•1.11 Fiber and Cabling—Provides troubleshooting procedures for fiber and cabling connectivity errors.

•1.12 Power and LED Tests—Provides troubleshooting procedures for power problems and lists LED behavior.

1.1Network Troubleshooting Tests

Use loopbacks and hairpins to test newly created circuits before running live traffic or to logically locate the source of a network failure. Both the ONS 15310-CL and ONS 15310-MA allow electrical, optical, and Ethernet loopbacks:

•For the ONS 15310-CL, the 15310-CL-CTX controller card contains DS-1, DS-3, EC-1, and OC-3 or OC-12 optical ports which can be loopbacked. The CE-100T-8 Ethernet cards can be loopbacked, but the ML-100T-8 Ethernet card cannot support this function.

•For the ONS 15310-MA, the CTX2500 controller card contains OC-N ports that can support optical loopbacks. The DS1-28/DS3-EC1-3 card and DS1-84/DS3-EC1-3 card support electrical loopbacks. The CE-100T-8 Ethernet card supports loopbacks, but the ML-100T-8 card does not.

1.1.1Facility Loopback

A facility loopback tests a card’s line interface unit (LIU) and related cabling. After applying a facility loopback on a port, use an optical or electrical test set, as appropriate, to run traffic over the loopback. A successful facility loopback isolates the card LIU or the cabling plant as the potential cause of a network problem.

Caution Before performing a facility loopback on any port, make sure there are at least two data communications channel (DCC) paths to the node where the card is installed. A second DCC provides a nonlooped path to log into the node after the loopback is applied, thus enabling you to remove the facility loopback.

Ensuring a second DCC is not necessary if you are directly connected to the node containing the loopback port.

Caution A facility loopback applies to an entire facility and not to an individual circuit. Exercise caution when using loopbacks on an OC-N port carrying live traffic because this traffic can be interrupted.

Note In CTC, the facility loopback is sometimes called a “facility (line)” loopback to indicate the direction that the loopback signal travels, that is, toward the span.

Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0

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Cisco Systems ONS 15310-CL, ONS 15310-MA manual Network Troubleshooting Tests, Facility Loopback
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ONS 15310-CL, ONS 15310-MA specifications

Cisco Systems has long been a leader in networking and telecommunications technology, and among its impressive lineup of products, the Cisco ONS 15310 series stands out as an essential solution for optical networking. This series includes models such as the ONS 15310-MA, ONS 15310-CL, and ONS 15310-CA, each designed to meet the diverse needs of service providers and enterprises seeking to enhance their optical transport networks.

The Cisco ONS 15310-MA is an advanced multi-service platform designed for metropolitan area networks. It facilitates the seamless transport of data, voice, and video over optical networks. One of its main features is its ability to support a variety of interfaces, including Ethernet, SONET/SDH, and Wavelength Division Multiplexing (WDM), allowing users to integrate multiple services into a single platform. Additionally, the ONS 15310-MA supports advanced traffic management and Quality of Service (QoS) features to prioritize critical applications and ensure consistent performance.

The ONS 15310-CL variant is tailored for more specific applications, providing enhanced capabilities aimed at delivering carrier-grade services. It features a robust architecture that accommodates high-capacity traffic without compromising reliability. This model emphasizes low power consumption and a compact design, making it suitable for deployment in space-constrained environments. The ONS 15310-CL also supports a wide range of optical interfaces, making it highly flexible for various network configurations.

In terms of technologies, the Cisco ONS 15310 series leverages Optical Transport Network (OTN) capabilities, providing high efficiency and greater bandwidth utilization. OTN technology enables efficient error correction and adds resilience to the network through its built-in protection mechanisms. Furthermore, the series supports seamless integration with existing IP/MPLS networks, creating a cohesive infrastructure as organizations evolve their networking requirements.

One of the defining characteristics of the ONS 15310 series is its focus on scalability. Network operators can start with a modest deployment and gradually expand capacity as demand grows. This adaptability is complemented by Cisco's comprehensive management and monitoring tools, providing operators with real-time insights into network performance and facilitating proactive management.

In conclusion, the Cisco ONS 15310-MA and ONS 15310-CL models represent sophisticated solutions for modern optical networks. With their versatile features, advanced technologies, and robust design, they empower service providers and enterprises to build resilient, high-capacity networks that meet the demands of today’s data-driven world.
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