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Cisco 3725 Hardware Installation Guide - Page 59

DC Wiring Requirements for Cisco 3725 Routers, DC Power, Source, DC Input, Wire Size, Safety Ground

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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. A Cisco 3725 router with a DC-input power supply requires copper wire and crimp-type terminals for the power connections. Table 3-1 summarizes the wiring requirements. Table 3-1 DC Wiring Requirements for Cisco 3725 Routers DC Power Source DC Input DC Input Wire Size Nominal 24/48 24-36 VDC, 9 A, positive or VDC1 negative, single source or dual sources AWG 18 (1.0 mm2) 36-60 VDC, 4 A, positive or negative, single source or dual sources AWG 18 (1.0 mm2) 1. The input voltage tolerance limits for DC power are 18 and 72 VDC. Safety Ground Wire Size Wire Terminal (Lug) AWG 14 (2.0 mm2) Molex part number 19193-0017, or equivalent AWG 14 (2.0 mm2) Molex part number 19193-0017, or equivalent Overcurrent Protection 15 A maximum 15 A maximum 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 Step 3 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. 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 Step 5 Remove the plastic cover from the terminal block. Save it for reinstallation after you finish wiring. 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. OL-2180-08 Cisco 3700 Series Routers Hardware Installation Guide 3-13

Section	Page
Cisco 3700 Series Routers Hardware Installation Guide	1
Contents	3
Preface	7
Objectives	7
Audience	8
Organization	8
Conventions	8
Safety Warnings	9
Related Documentation	14
Obtaining Documentation	16
Cisco.com	16
Ordering Documentation	16
Documentation Feedback	16
Obtaining Technical Assistance	17
Cisco Technical Support Website	17
Submitting a Service Request	17
Definitions of Service Request Severity	18
Obtaining Additional Publications and Information	18
Overview of Cisco 3700 Series Routers	21
Hardware Features	21
Cisco 3725	21
Cisco 3745	22
Modules, Interface Cards, and Memory	23
Memory	24
Interface Numbering	25
Cisco 3725 Interfaces	25
WAN and LAN Interface Numbering	25
Voice Interface Numbering	26
Cisco 3745 Interfaces	27
WAN and LAN Interface Numbering	27
Voice Interface Numbering	28
Power Supply Options	29
Internal –48 V Telephony Power Modules	29
System Specifications	31
Regulatory Compliance	32
Preparing to Install the Router	33
Safety Recommendations	33
Safety with Electricity	34
Preventing Electrostatic Discharge Damage	34
General Site Requirements	35
Power Supply Considerations	35
Site Environment	36
Site Configuration	36
Equipment Racks	36
Installation Checklist	37
Creating a Site Log	38
Inspecting the Router	38
Required Tools and Equipment for Installation and Maintenance	39
Console and Auxiliary Port Considerations	40
Console Port Connections	40
Auxiliary Port Connections	40
Preparing to Connect to a Network	41
Ethernet Connections	41
Token Ring Connections	42
Serial Connections	42
Configuring Serial Connections	42
Serial DTE or DCE Devices	42
Signaling Standards Supported	43
Distance Limitations	43
Asynchronous/Synchronous Serial Module Data Rates	44
ISDN BRI Connections	44
56-K/Switched-56-kbps DSU/CSU Connections	45
Installing the Router	47
Installing Modules, Interface Cards, and Power Supplies	47
Setting Up the Chassis	48
Setting the Chassis on a Desktop	48
Rack-Mounting the Chassis	49
Attaching Brackets to the Cisco 3725 Router	50
Attaching Brackets to the Cisco 3745 Router	52
Mounting the Router in a Rack	53
Installing the Chassis Ground Connection	54
Cisco 3725 Router Ground Connection	55
Cisco 3745 Router Ground Connection	56
Power Connections	57
Connecting Routers to AC Power	58
Connecting Routers to a DC-Input Power Supply	58
Wiring the DC-Input Power Supply in Cisco 3725 Routers	58
Wiring the DC-Input Power Supply in Cisco 3745 Routers	63
Connecting Routers to the Cisco Redundant Power System	66
Connecting WAN, LAN, and Voice Cables	66
Ports and Cabling	66
Connection Procedures and Precautions	67
Connecting to a Console Terminal or Modem	68
Connecting to the Console Port	68
Connecting to the Auxiliary Port	70
Identifying a Rollover Cable	71
Powering Up the Router	72
Checklist for Power Up	72
Front Panel Indicators	72
Power-Up Procedure	73
Configuring the Router	75
Initial Configuration Using SDM	75
Initial Configuration Using the Setup Command Facility	75
Initial Configuration Using the CLI (Manual Configuration)	78
Troubleshooting	81
Solving Problems	82
Troubleshooting the Power and Cooling Systems	82
Environmental Reporting Features	83
Troubleshooting Modules, Cables, and Connections	83
Reading Front-Panel LEDs	84
Reading Rear Panel LEDs	86
Error Messages	88
Recovering a Lost Password	92
Using the ROMMonitor	93
Entering ROM Monitor Mode	93
Enter ROM Monitor Mode by Using the reload Command	94
Enter ROM Monitor Mode by Resetting the Configuration Register	94
ROM Monitor Commands	94
ROM Monitor Syntax Conventions	95
ROM Monitor Command Descriptions	95
Boot Commands in the ROM Monitor	95
Informational Commands in the ROM Monitor	97
Other Useful ROM Monitor Commands	98
Debugging Commands in the ROM Monitor	98
Configuration Register	98
Modifying the Configuration Register in Menu Mode	99
Modifying the Configuration Register by Hexadecimal Entry	99
Recovering Cisco IOS Software Images	100
Description and Options of the xmodem Command	100
Console Requirements	100
Procedure for the xmodem Command	101
Configuration Register	103
Configuration Register Settings	103
Changing Configuration Register Settings	104
Configuring the Boot Field	105
Enabling Booting from CompactFlash Memory	107

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3-13

Cisco 3700 Series Routers Hardware Installation Guide

OL-2180-08

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.

A Cisco 3725 router with a DC-input power supply requires copper wire and crimp-type terminals for

the power connections.

Table 3-1

summarizes the wiring requirements.

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.

Table 3-1

DC Wiring Requirements for Cisco 3725 Routers

DC Power

Source

DC Input

Wire Size

Safety Ground

Wire Size

Wire Terminal (Lug)

Overcurrent

Protection

Nominal 24/48

VDC

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

24–36 VDC, 9 A, positive or

negative, single source or dual

sources

AWG 18

(1.0 mm

)

AWG 14

(2.0 mm

)

Molex part number

19193-0017, or equivalent

15 A

maximum

36–60 VDC, 4 A, positive or