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Cisco Systems OL-8978-02 manual Power Requirements, Phone Class Required Power W, 55-14

Models: OL-8978-02

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Chapter 55 Configuring a VoIP Network

Configuring VoIP on a Switch

Each port also has a status that is defined as one of the following:

•on—Power is supplied by the port.

•off—Power is not supplied by the port.

•Power-deny—The supervisor engine does not have enough power to allocate to the port, or the power that is configured for the port is less than the power that is required by the port; the power is not being supplied by the port.

•err-disable—The port is unable to provide the power to the connected device that is configured in Static mode.

•faulty—The port failed the diagnostics tests.

These sections provide the information on the IP phone power requirements and management:

•Power Requirements, page 55-14

•Available Power, page 55-15

•Wall-Powered Phones, page 55-15

•Powering Off the Phone, page 55-15

•Phone Removal, page 55-15

•High-Availability Support, page 55-16

Power Requirements

The IP phones may have different power requirements. Table 55-4lists the power requirements for the different classes of IP phones. The supervisor engine initially calculates the power allocation for each port based on the per-port configuration, classification (IEEE only), and default power. When the correct amount of power is determined from the CDP messaging with the Cisco IP Phone, the supervisor engine reduces or increases the allocated power for any ports that are set to Auto mode. The allocated power is not adjusted for ports that are set to Static mode.

For example, the default allocated power is 7 W for a Cisco IP Phone requiring 6.3 W. The supervisor engine allocates 7 W for the Cisco IP Phone and powers it up. Once the Cisco IP Phone is operational, it sends a CDP message with the actual power requirement to the supervisor engine. The supervisor engine then decreases the allocated power to the required amount if the port is set to Auto mode. If the port is set to Static mode, the supervisor engine allocates the wattage that you specified. If the port is set to off, the supervisor engine does not allot any power to the port.

 

 

 

 

Table 55-4

Power Requirements for IP Phones

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Phone Class

 

Required Power (W)

 

 

 

 

 

 

 

 

 

 

 

 

 

Cisco

 

6.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cisco + IEEE

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cisco High Power

15.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Class 0 IEEE

 

15.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Class 1 IEEE

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Class 2 IEEE

 

7.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Class 3

 

15.4

 

 

 

 

 

 

 

 

 

 

 

 

 

Class 4 Refer to Class 0

Reserved

 

 

 

 

 

 

 

 

 

 

 

Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

55-14

 

 

 

 

 

OL-8978-02

 

 

 

 

 

 

 

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Cisco Systems OL-8978-02 manual Power Requirements, Phone Class Required Power W, 55-14
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OL-8978-02 specifications

Cisco Systems OL-8978-02 is a comprehensive training curriculum designed to enhance the skills and knowledge of network professionals seeking to advance their careers in network management and security. This curriculum offers a significant focus on Cisco networking technologies and concepts, ensuring that learners are well-equipped to handle the intricacies of modern network environments.

One of the primary features of OL-8978-02 is its in-depth coverage of foundational networking concepts, which are crucial for effective network administration. The curriculum includes detailed modules on networking fundamentals, such as OSI and TCP/IP models, LAN and WAN architectures, and network protocols. This solid foundation enables learners to understand how different networking components interact and function together, forming the backbone of corporate and enterprise environments.

In addition to foundational knowledge, OL-8978-02 integrates a strong focus on security technologies and practices. Considering the increasing prevalence of cyber threats, the course emphasizes the importance of implementing robust security measures. Participants will learn about firewalls, intrusion prevention systems, VPNs, and other critical security technologies. This focus ensures that learners are prepared to safeguard networks against evolving security threats, a necessity in today’s digital landscape.

Another distinguishing characteristic of the OL-8978-02 curriculum is its emphasis on hands-on experience. The program often includes practical labs and simulations, allowing participants to apply theoretical knowledge in real-world scenarios. This experiential learning approach is pivotal for solidifying skills and boosting confidence in network management tasks.

Furthermore, OL-8978-02 addresses the latest advancements in networking technology, including software-defined networking (SDN) and cloud computing. By introducing emerging technologies, this curriculum ensures that professionals remain ahead of the curve, ready to adapt to the future demands of networking.

Finally, Cisco Systems OL-8978-02 positions itself not only as an educational tool but also as a career catalyst, providing learners with skills that are highly sought after in the IT job market. Upon completion, participants often find themselves well-prepared for various Cisco certifications, which can enhance their employability and professional growth opportunities in a competitive landscape. Through its thorough approach, OL-8978-02 plays a vital role in shaping the next generation of network professionals.