Chapter 1 General Troubleshooting

Circuits and Timing

Table 1-28 DS3 Card Does Not Report AIS-P From External Equipment

Possible Problem

Solution

 

 

The card is functioning

This card terminates the port signal at the backplane so STS AIS-P is not

as designed.

reported from the external equipment/line side.

 

DS-3 cards have DS-3 header monitoring functionality, which allows you to

 

view performance monitoring (PM) on the DS-3 path. Nevertheless, you

 

cannot view AIS-P on the STS path. For more information on the PM

 

capabilities of the DS-3 cards, refer to the Cisco ONS 15327 Procedure

 

Guide.

 

 

1.7.5 OC-3 and DCC Limitations

Symptom Limitations to OC-3 and DCC usage.

Table 1-29describes the potential cause of the symptom and the solution.

Table 1-29 OC-3 and DCC Limitations

Possible Problem

Solution

 

 

OC-3 and DCC have

For an explanation of OC-3 and DCC limitations, refer to the DCC Tunnels

limitations for the

section of the Cisco ONS 15327 Procedure Guide.

ONS 15327.

 

 

 

1.7.6 ONS 15327 Switches Timing Reference

Symptom Timing references switch when one or more problems occur.

Table 1-30describes the potential cause(s) of the symptom and the solution(s).

Table 1-30 ONS 15327 Switches Timing Reference

 

 

Possible Problem

 

Solution

 

 

 

 

 

 

 

 

 

 

 

 

 

The optical or building integrated timing supply

 

The ONS 15327 internal clock operates at a

 

 

(BITS) input is receiving loss of signal (LOS), loss of

 

Stratum 3 level of accuracy. This gives the

 

 

frame (LOF), or AIS alarms from its timing source.

 

ONS 15327 a free-running synchronization

 

 

 

 

accuracy of ± 4.6 ppm and a holdover stability

 

 

The optical or BITS input is not functioning.

 

 

 

 

of less than 255 slips in the first 24 hours or

 

 

 

 

 

 

Synchronization status message (SSM) is set to Don’t

 

 

 

 

3.7 x 10

–7

per day, including temperature.

 

 

Use for Synchronization (DUS).

 

 

 

 

 

ONS 15327 free-running synchronization

 

 

 

 

 

 

SSM indicates a Stratum 3 or lower clock quality.

 

 

 

 

relies on the Stratum 3 internal clock.

 

 

 

 

 

 

The input frequency is off by more than 15 ppm.

 

Use a higher quality Stratum 1 or Stratum 2

 

 

 

 

 

 

The input clock wanders and has more than three slips

 

timing source. This results in fewer timing

 

 

in 30 seconds.

 

slips than a lower quality Stratum 3 timing

 

 

 

 

source.

 

 

 

 

 

 

 

 

A bad timing reference existed for at least two

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

minutes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cisco ONS 15327 Troubleshooting Guide, R3.4

 

 

 

 

 

 

 

 

April 2003

 

 

 

 

 

1-69

 

 

 

 

 

 

 

 

 

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Cisco Systems manual 5 OC-3 and DCC Limitations, ONS 15327 Switches Timing Reference
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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.
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