38CHAPTER 2: INSTALLING THE SWITCH

Specifying the

3Com’s redundant power solution allows you to use any off-the-shelf

Redundant Power

-48V DC RPS that meets the requirements defined in Appendix C on

System

page 127.

 

 

 

 

 

 

 

For an approved vendor list, more details about purchasing the 3Com

 

recommended RPS, and a full set of requirements go to:

 

 

http://www.3Com.com/RPS

 

 

 

 

 

The 3Com recommended RPS generates -48V DC power using power

 

supply units (or rectifiers). The outputs of the rectifier(s) are connected

 

together so that you can increase the total -48V power available by

 

adding rectifiers. For example, three 1500W rectifiers can provide up to

 

4500W. Hot removal or insertion of a rectifier does not affect the -48V

 

DC output voltage.

 

 

 

 

 

 

Table 14 shows an example of the total power available from several

 

1500W rectifiers.

 

 

 

 

 

 

A minimum of two rectifiers are required for each shelf to provide N+1

 

rectifier redundancy.

 

 

 

 

 

 

Table 14 Power Availability

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rectifiers

 

 

 

 

 

1

2

3

4

5

6

 

 

 

 

 

 

 

 

 

No Rectifier

1500W

3000W

4500W

6000W

7500W

9000W

 

Redundancy

 

 

 

 

 

 

 

N+1 Rectifier

-

1500W

3000W

4500W

6000W

7500W

 

Redundancy

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The unearthed -48V DC power distribution provides the mechanism to connect to the Switch 5500. The distribution consists of several circuit breakers and connection terminals for the positive (common) and negative -48V outputs. Individually connect each Switch 5500 to a circuit breaker terminal.

You can also connect a battery to battery terminals prior to the DC power distribution to provide uninterrupted power and to be protected against the loss of AC mains power.

Page 38
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3Com 5500G-EI, 5500-EI manual Specifying, System, Recommended RPS, and a full set of requirements go to, Power Availability

5500G-EI, 5500-EI specifications

The 3Com 5500-EI and 5500G-EI series are advanced Ethernet switches designed for enterprise networks, catering to the growing demand for high-performance, secure, and scalable networking solutions. These switches are particularly suited for large organizations that require robust management capabilities and high-density connectivity.

One of the key features of the 5500-EI and 5500G-EI models is their modular architecture, which allows businesses to tailor the switch configuration to their specific needs. With options for various interface modules, including Gigabit Ethernet and PoE (Power over Ethernet), these switches can support diverse networking requirements and facilitate the gradual expansion of the network infrastructure.

The Series offers advanced Layer 2 and Layer 3 switching capabilities. Layer 2 features include VLAN tagging, trunking, and Spanning Tree Protocol (STP) to ensure efficient traffic management and network segmentation. On the Layer 3 front, the switches support static routing, RIP, and OSPF, enabling dynamic routing protocols for better traffic flow and load balancing. These features together enhance the performance and reliability of enterprise applications.

Security is another vital aspect of the 3Com 5500-EI and 5500G-EI series. The switches come equipped with robust security features to protect sensitive data and maintain compliance. These include MAC address filtering, access control lists (ACLs), and support for 802.1X authentication. Additionally, the devices support secure management protocols like SNMP v3, which enhances the security of management communications.

The 5500G-EI model stands out with its high-density port offerings, supporting up to 48 ports in a single switch, with an option for stacking to create a unified management platform across multiple switches. This flexibility allows organizations to leverage their existing infrastructure while scaling seamlessly in response to growing demands.

Another notable characteristic is the built-in IPv6 support, which positions the 3Com 5500-EI and 5500G-EI models favorably for future-proofing enterprise networks as the transition to IPv6 continues. This feature ensures that organizations can maintain connectivity as devices increasingly adopt the newer protocol.

In conclusion, the 3Com 5500-EI and 5500G-EI series offer a comprehensive suite of features and technologies designed for high-performance enterprise networking. With modularity, robust Layer 2 and Layer 3 capabilities, enhanced security measures, and a focus on scalability, these switches provide a solid foundation for modern corporate networks, accommodating future growth and technological advancements.