Chapter 2 Alarm Troubleshooting

Trouble Notifications

Table 2-7 Alarm Type/Object Definition (continued)

NERING

Represents the ring status in the NE

 

 

NE-SYNCH

Represents the timing status of the NE

 

 

OCN

An OC-N line on an OCN card

 

 

STSMON

STS alarm detection at the monitor point (upstream from the cross-connect)

 

 

STSTERM

STS alarm detection at termination (downstream from the cross-connect)

 

 

VT-MON

VT1 alarm detection at the monitor point (upstream from the cross-connect)

 

 

VT-TERM

VT1 alarm detection at termination (downstream from the cross-connect)

 

 

2.4 Trouble Notifications

The ONS 15327 uses standard Telcordia categories to characterize levels of trouble. The ONS 15327 reports alarmed trouble notifications in the CTC Alarms window and Not Alarmed (NA) trouble notifications in the Conditions window. Alarms signify a problem that the user needs to fix, such as an LOS (OC-N) alarm (see page 2-84). Conditions notify the user of an event which does not require action, such as a SWTOSEC condition (see page 2-115)or a MANRESET condition (see page 2-88).

Telcordia further divides alarms into Service-Affecting (SA) and NSA status. An SA failure affects a provided service or the network’s ability to provide service. For example, a TRMT-MISS alarm (see page 2-121)is characterized as an SA failure. TRMT-MISS occurs when the cable connector leading to a DS-1 port on an XTC card is removed. This affects a provided service because traffic switches to the protect card. The HITEMP alarm (see page 2-72)means that the alarm object is hotter than 122 degrees Fahrenheit (50 degrees Celsius). HITEMP is an NSA failure for a single piece of equipment, or an SA failure for the NE. For example, if the HITEMP alarm is raised against a port with an EQPT object, the alarm is NSA because port and card traffic is protected. If the HITEMP alarm is raised against the NE (shelf), however, it is an SA alarm because a high temperature affects the network’s ability to provide service.

2.4.1 Conditions

When an SA failure is detected, the ONS 15327 also sends an AIS condition (see page 2-16)downstream. When the node receives the AIS, the node sends an RFI-L condition (see page 2-101)upstream. AIS and RFI belong in the conditions category and show in the Conditions window of CTC. However, unlike most conditions which are Not Alarmed (NA), Telcordia classifies these conditions as Not Reported (NR).

Both CTC and TL1 report NRs and NAs as conditions when conditions are retrieved. NAs are also reported as autonomous events in TL1 and in the History window of CTC. For a comprehensive list of all conditions, refer to the Cisco ONS 15454 and Cisco ONS 15327 TL1 Command Guide.

2.4.2 Severities

The ONS 15327 uses Telcordia standard severities: Critical (CR), Major (MJ), and Minor (MN). Critical indicates a severe, service-affecting alarm that needs immediate correction. Major is a serious alarm, but the failure has less of an impact on the network. For example, with an LOS (DS-1), a Major alarm, 24 DS-0 circuits lose protection. But with a LOS (OC-N)for an OC-48 card, a Critical alarm, approximately 25,000 DS-0 circuits lose protection.

Cisco ONS 15327 Troubleshooting Guide, R3.4

2-14

March 2004

 

 

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Cisco Systems ONS 15327 manual Trouble Notifications, Conditions, Severities

ONS 15327 specifications

Cisco Systems ONS 15327 is a high-performance optical networking solution tailored for service providers and enterprises looking to enhance their optical communication infrastructure. This versatile platform is recognized for its robust performance, scalability, and flexibility, making it suitable for a wide array of applications ranging from broadband access to metropolitan area networking.

One of the standout features of the ONS 15327 is its ability to handle multiple data types over a single platform. It supports a rich array of protocols, including Ethernet and SONET/SDH, allowing service providers to deliver a diverse portfolio of services to their customers. This multiservice capability simplifies the network architecture, reducing operational complexity and costs.

The ONS 15327 is designed with a modular architecture, which enables operators to customize and scale their network as demand grows. It supports a variety of card options for different media types, wavelengths, and capacity requirements. This modularity not only facilitates straightforward upgrades but also allows for efficient network management.

In terms of technology, the ONS 15327 leverages dense wavelength division multiplexing (DWDM) capabilities to maximize the utilization of available fiber bandwidth. This allows for an impressive increase in transmission capacity without the need for additional fiber installations, making it a cost-effective solution for expanding networks.

Another significant characteristic of the Cisco ONS 15327 is its advanced performance monitoring and management features. Built-in diagnostic tools provide real-time visibility into network performance, enabling prompt identification and troubleshooting of potential issues. This proactive approach to network management enhances service reliability and customer satisfaction.

Security is also paramount in the ONS 15327. The platform integrates various security features and protocols to protect the data traversing the network, ensuring compliance with industry standards and safeguarding sensitive information.

Furthermore, the equipment is designed for easy integration into existing infrastructures. Its compatibility with Cisco’s broader networking solutions allows for seamless interconnection with routers, switches, and other devices, facilitating comprehensive network solutions.

In conclusion, Cisco Systems ONS 15327 stands out as a powerful optical networking platform that combines versatility, scalability, and advanced management features. Its ability to support various protocols and harness optical technologies makes it an essential tool for organizations aiming to optimize their telecommunications infrastructure while minimizing costs and complexity.