Cisco Systems OL-21035-01 manual Where to Go for More Troubleshooting Information

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Chapter 6 Troubleshooting and Maintenance

Where to Go for More Troubleshooting Information

Table 6-2

ATA 187 Troubleshooting (continued)

 

 

 

Summary

 

Explanation

 

 

Loopback condition

A loopback condition can occur when the following conditions are

 

 

met:

 

 

The SW Port Configuration option in the Network

 

 

Configuration menu on the phone is set to 10 Half

 

 

(10-BaseT/half duplex)

 

 

The phone receives power from an external power supply

 

 

The phone is powered down (the power supply is disconnected)

 

 

In this case, the switch port on the phone can become disabled and

 

 

the following message will appear in the switch console log:

 

 

HALF_DUX_COLLISION_EXCEED_THRESHOLD

 

 

To resolve this problem, re-enable the port from the switch.

 

 

 

One-way audio

 

When at least one person in a call does not receive audio, IP

 

 

connectivity between phones is not established. Check the

 

 

configurations in routers and switches to ensure that IP connectivity

 

 

is properly configures.

 

 

Peer to peer image distribution

If the peer to peer image distribution fails, the phone will default to

fails.

 

using the TFTP server to download firmware. Access the log

 

 

messages stored on the remote logging machine to help debug the

 

 

peer to peer image distribution feature.

 

 

Note These log messages are different than the log messages sent

 

 

to the phone log.

 

 

Phone call cannot be established

The phone does not have a DHCP IP address, is unable to register to

 

 

Cisco Unified Communications Manager, and shows a Configuring

 

 

IP or Registering message.

 

 

Verify the following:

 

 

1. The Ethernet cable is attached.

 

 

2. The Cisco CallManager service is running on the Cisco Unified

 

 

Communications Manager server.

 

 

3. Both phones are registered to the same Cisco Unified

 

 

Communications Manager.

 

 

4. Audio server debug and capture logs are enabled for both

 

 

phones. If needed, enable Java debug.

 

 

 

Where to Go for More Troubleshooting Information

If you have additional questions about troubleshooting the ATA 187, several Cisco.com web sites can provide you with more tips. Choose from the sites available for your access level.

ATA 187 Troubleshooting Resources: http://www.cisco.com/en/US/products/hw/gatecont/ps514/tsd_products_support_series_home.html

Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.0

 

OL-21035-01

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Contents Resolving Startup Problems Troubleshooting and MaintenanceChecking Network Connectivity Verifying DNS Settings Symptom ATA 187 Unable to Obtain IP Address Verifying Dhcp Settings ATA 187 Resets UnexpectedlyVerifying Physical Connection Identifying Intermittent Network OutagesChecking Static IP Address Settings Verifying Voice Vlan ConfigurationEliminating DNS or Other Connectivity Errors Troubleshooting ATA 187 Security General Troubleshooting TipsChecking Power Connection Troubleshooting and Maintenance General Troubleshooting Tips Halfduxcollisionexceedthreshold Where to Go for More Troubleshooting InformationCleaning the ATA

OL-21035-01 specifications

Cisco Systems OL-21035-01 refers to a specific product or course pertaining to networking technologies offered by Cisco. While details of OL-21035-01 may allude to various learning modules, let’s explore its primary features, technologies, and characteristics that highlight the significance of Cisco’s offerings in the IT landscape.

At its core, OL-21035-01 encapsulates essential networking principles and is likely part of Cisco's extensive training portfolio focused on solidifying foundational knowledge in networking. One prominent feature includes a comprehensive curriculum that covers advanced routing and switching concepts. This ensures participants are well-equipped to manage and maintain modern network infrastructures, which are critical in today’s connectivity-driven world.

The learning materials may also leverage dynamic teaching methodologies, engaging participants through simulations and practical labs. This experiential learning approach allows individuals to demonstrate proficiency in configuring Cisco routers and switches, troubleshooting network problems, and implementing strategies for optimizing performance.

In terms of technologies, OL-21035-01 aligns closely with modern networking trends such as Software-Defined Networking (SDN), Internet of Things (IoT), and cloud computing. Understanding these technologies is essential as organizations increasingly rely on scalable, flexible, and intelligent network solutions. The program may also delve into Cisco's proprietary technologies like Cisco IOS, which is fundamental for managing network devices.

Another characteristic of OL-21035-01 is its alignment with industry standards and best practices. This ensures that professionals undergoing training are prepared for real-world scenarios they will face while managing enterprise-level networks. Cisco certifications, often obtainable through these courses, are recognized globally and can significantly enhance career prospects.

Additionally, OL-21035-01 stresses the importance of security in networking. Participants learn about robust security protocols, firewall configurations, and strategies to protect networks against cyber threats, ensuring that they remain resilient in the face of growing security challenges.

Lastly, Cisco’s emphasis on continuous learning is mirrored in the iterative nature of its offerings, encouraging IT professionals to stay updated with the latest advancements in technology. Consequently, OL-21035-01 not only serves as a stepping stone in one’s career but also fosters a culture of lifelong learning, vital for navigating the ever-evolving tech landscape.

In summary, OL-21035-01 embodies a holistic approach to networking education, focusing on critical skills development, contemporary technologies, and a robust understanding of security measures necessary for thriving in the IT sector.