Chapter 2 Preparing for Installation

Power Connection Guidelines for DC-Powered Systems

Power Connection Guidelines for DC-Powered Systems

This section provides the basic guidelines for connecting the Catalyst 4500 E-series switch compatible DC-input power supplies to the site power source or AC power shelf:

All power connection wiring should conform to local and national codes.

DC (–) and DC return (+) terminals are evaluated for use with 1/0 AWG wire (1400W DC supply only).

The ground terminal is evaluated for use with 6 AWG wire (10 AWG for the multi-input power supply).

DC (–) and DC return (+) wire lugs shall not exceed 0.83 inches in width (0.378 inches for the multi-input power supply).

For DC power cables, we recommend that you use commensurately rated, high-strand-count copper wire cable. Connection to the DC-input power supply requires one earth ground cable, one source DC (–), and one source DC return (+). The length of the cables depends on your switch location.

These cables are not available from Cisco Systems. They are available from any commercial cable vendor.

The color coding of the source DC power cable leads depends on the color coding of the site DC power source. Typically, green or green and yellow indicate that the cable is a ground cable. Because there is no color code standard for source DC wiring, you must ensure that the power cables are connected to the DC-input power supply terminal block in the proper (+) and (–) polarity. In some cases, the source DC cable leads might have a positive (+) or a negative (–) label. This label is a relatively safe indication of the polarity, but you must verify the polarity by measuring the voltage between the DC cable leads. When making the measurement, the positive (+) lead and the negative

(–) lead must always match the (+) and (–) labels on the DC-input power supply terminal block.

Calculating DC Input Current

Complete power usage tables are in the Catalyst 4500 Series Module Installation Guide. To calculate the DC input current needed for data and inline power applications, use the following steps (the example shows the DC input current requirement in a Catalyst 4503-E with a Supervisor Engine II and two WS-X4306-GB modules, and assumes a DC input voltage of -48 VDC):

Step 1 Add the power requirement for each component in your system.

Catalyst 4503-E uses 54 W

Supervisor Engine II+ uses 147 W

WS-X4306-GB uses 2 X 47 = 94 W

Total DC input power = 295 W

Step 2 After the entries for all components have been added together, divide that number by the DC input voltage to determine the DC input current.

Input current = 295 W/48 VDC = 6.14 A for data only.

Step 3 to Step 5 are for applications requiring inline power. If your configuration does not include inline power devices, the DC input current is the result of Step 2.

Step 3 If you want to add an inline-capable module (WS-X4148-RJ45V) with 10 inline devices (such as IP Phones) to your system, calculate the DC output power sent to inline devices.

Catalyst 4500 E-Series Switches Installation Guide

 

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Cisco Systems 4500 E-Series manual Power Connection Guidelines for DC-Powered Systems, Calculating DC Input Current

4500 E-Series, WSUPOE12VPSPL specifications

Cisco Systems has long been at the forefront of networking technology, consistently delivering innovative products that shape the future of digital communication. Among its extensive range of offerings, the WSUPOE12VPSPL and the Catalyst 4500 E-Series stand out as exemplary solutions tailored for businesses seeking robust, scalable, and versatile network infrastructure.

The WSUPOE12VPSPL is a 12-port Power over Ethernet (PoE) switch that provides significant advantages for organizations looking to streamline their operations. It is designed to deliver power and data over a single cable, reducing the clutter of additional power supplies and cords. This efficiency not only simplifies deployment but also enhances the flexibility to place devices anywhere within the network environment, making it an ideal choice for powering IP phones, wireless access points, and surveillance cameras.

Main features of the WSUPOE12VPSPL include its ability to deliver up to 15.4 watts of power per port, supporting up to 12 PoE devices simultaneously. This capability is especially beneficial in environments where power outlets are scarce or where devices are located in non-traditional locations. With a rugged design suitable for various operational contexts, it ensures reliable performance even under demanding conditions.

When integrated within the Catalyst 4500 E-Series switches, organizations can leverage advanced technologies that enhance overall network performance and security. The Catalyst 4500 E-Series is known for its modularity, allowing businesses to expand their networks as required. Its architecture supports high throughput, advanced QoS features, and extensive Layer 2 and Layer 3 capabilities, ensuring efficient data handling and management.

Moreover, the Catalyst 4500 E-Series can integrate with Cisco’s digital network architecture and software-defined networking (SDN), facilitating automation and better visibility through tools such as Cisco DNA Center. This allows IT administrators to efficiently manage network resources, monitor performance, and implement security policies with ease.

In terms of operational intelligence, the integration with analytics tools enables organizations to gain insights into traffic patterns, user behaviors, and application performance, thus empowering data-driven decision-making.

Overall, the Cisco WSUPOE12VPSPL and the Catalyst 4500 E-Series offer a powerful combination of features, technologies, and characteristics that make them indispensable to modern networking. They cater to the demands of diverse business environments, ensuring reliability, flexibility, and scalability as organizations continue to evolve in an increasingly digital landscape.