Chapter 3 Installing the Router

Power Connections

DC Wiring Requirements for Cisco 3725 Routers

Warning This product relies on the building’s installation for short-circuit (overcurrent) protection. Ensure that the protective device is rated not greater than:

15A, 60VDC. Statement 1005

Caution Dual sources with opposite-polarity grounding damage equipment.

ACisco 3725 router with a DC-input power supply requires copper wire and crimp-type terminals for the power connections. Table 3-1summarizes the wiring requirements.

Table 3-1

DC Wiring Requirements for Cisco 3725 Routers

 

 

 

 

 

 

 

 

 

DC Power

 

DC Input

Safety Ground

 

Overcurrent

Source

DC Input

Wire Size

Wire Size

Wire Terminal (Lug)

Protection

 

 

 

 

 

 

Nominal 24/48

24–36 VDC, 9 A, positive or

AWG 18

AWG 14

Molex part number

15 A

VDC1

negative, single source or dual

(1.0 mm2)

(2.0 mm2)

19193-0017, or equivalent

maximum

 

sources

 

 

 

 

 

 

 

 

 

 

 

36–60 VDC, 4 A, positive or

AWG 18

AWG 14

Molex part number

15 A

 

negative, single source or dual

(1.0 mm2)

(2.0 mm2)

19193-0017, or equivalent

maximum

 

sources

 

 

 

 

 

 

 

 

 

 

1. The input voltage tolerance limits for DC power are 18 and 72 VDC.

Wiring Procedure for Cisco 3725 Routers

To connect a Cisco 3725 router to a DC power source, perform the following steps:

Step 1 Remove power from the DC circuit. To ensure that power is removed from the DC circuit, locate the circuit breaker for the DC circuit, switch the circuit breaker to the OFF position, and tape the circuit-breaker switch in the OFF position.

Tip Secure all power cabling when installing this unit to avoid disturbing field-wiring connections.

Step 2 Strip the wires to the appropriate length for the terminals. The strip length is 1/8 to 3/16 inch (3 to 5 mm) for Molex number 19193-0009 and for AMP number 324159-0 terminals.

Step 3 Crimp the terminals to the power input and safety ground wires.

Warning When stranded wiring is required, use approved wiring terminations, such as closed-loop or spade-type with upturned lugs. These terminations should be the appropriate size for the wires and should clamp both the insulation and conductor. Statement 1002

Step 4 Remove the plastic cover from the terminal block. Save it for reinstallation after you finish wiring.

Step 5 Connect the DC power input wires to the terminal block as shown in Figure 3-16. To avoid interference with the on/off switch, organize the wires downward from the terminal block.

Cisco 3700 Series Routers Hardware Installation Guide

 

OL-2180-08

3-13

 

 

 

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Cisco Systems 3700 Series manual DC Power DC Input, Source DC Input Wire Size Wire Terminal Lug Protection

3700 Series specifications

Cisco Systems 3700 Series routers are a pivotal part of Cisco's portfolio, designed for medium to large enterprises aiming to deliver secure and efficient networking capabilities. Introduced as a versatile solution, these routers provide a comprehensive blend of performance, scalability, and investment protection.

One of the standout features of the Cisco 3700 Series is its modular architecture, allowing organizations to customize their router according to specific needs. This modularity supports various modules for different functions, including voice, data, and video, making the 3700 Series an ideal choice for converged networking environments. Administrators can enhance functionality through an array of WAN and voice interface cards that adapt as the organization's needs evolve.

The 3700 Series is built on Cisco's IOS (Internetwork Operating System), ensuring robust and high-quality performance. It supports advanced routing protocols including EIGRP, OSPF, and BGP, facilitating efficient data transmission across diverse environments. This versatility helps organizations implement sophisticated multi-site connectivity and enables reliable performance in complex network scenarios.

Security is a paramount concern in modern networking, and the Cisco 3700 Series delivers with features such as integrated firewall services, VPN support, and intrusion detection capabilities. These security measures protect sensitive data and ensure secure communication between remote sites—critical in today’s cyber landscape.

Another key characteristic of the 3700 Series is its support for Quality of Service (QoS), which prioritizes time-sensitive traffic such as voice and video. By ensuring that critical applications receive the bandwidth they require, organizations can maintain the quality of service that their users expect.

Moreover, the Cisco 3700 Series is designed with redundancy in mind. Features like dual power supplies and hot-swappable fan trays enhance reliability and uptime, which are crucial for mission-critical applications.

Furthermore, energy efficiency is an increasingly important consideration in network design. The Cisco 3700 Series adheres to modern energy standards, helping reduce the overall carbon footprint while supporting high-performance capabilities.

In summary, the Cisco Systems 3700 Series routers stand out for their modularity, advanced routing capabilities, robust security features, and energy efficiency, making them an optimal choice for enterprises that not only need performance but also flexibility and reliability in their networking solutions. As businesses continue to evolve and adapt, the Cisco 3700 Series is a dependable partner in their connectivity journey, ensuring they can meet current demands while preparing for future challenges.