Cisco 900 Series, C921-4P, C931-4P, C921J-4P Hardware Installation Manual
Hardware Installation Guide for the Cisco 900 Series Integrated
Services Router
Last Modified: 2019-01-11
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CONTENTS
CHAPTER 1
CHAPTER 2
Overview of Cisco 900 Series Integrated Services Routers 1
About Cisco 900 Series Integrated Service Routers 1
Chassis Views 2
LED Indicators 5
Power Supply 6
Specifications of Cisco 900 Series Integrated Services Routers 7
Periodic Inspection and Cleaning 7
Prepare for Router Installation 9
Safety Recommendations 9
Safety With Electricity 9
Prevent Electrostatic Discharge Damage 10
General Site Requirements 10
Site Selection Guidelines 11
Rack Requirements 11
Router Environmental Requirements 12
Power Guidelines and Requirements 12
Network Cabling Specifications 13
Console Port Connections 13
EIA/TIA-232 13
Console Port Considerations 14
Preparing for Network Connections 14
Ethernet Connections 14
Required Tools and Equipment for Installation 14
CHAPTER 3
Install and Connect the Router 17
Hardware Installation Guide for the Cisco 900 Series Integrated Services Router
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Contents
Unpack the Router 17
Set up Router on Desktop, Rack, Shelf, or Wall 17
Rack Mount 18
Attach the Brackets to the Router 18
Mount the Router 19
Wall Mount 21
Mount the Router on Desk or Shelf 24
Mount the Router under a Desk or a Shelf 25
Chassis Grounding 27
Connect Power Cable 28
Connect the Router to a Console 29
Connect to the Serial Port with Microsoft Windows 30
Connect to the Console Port with Mac OS X 30
CHAPTER 4
Connect to the Console Port with Linux 31
Connect WAN and LAN Interfaces 31
Ports and Cabling 32
Connection Procedures and Precautions 32
Configure the Router at Startup 32
ROM Monitor Overview and Basic Procedures 33
ROM Monitor Overview 33
Hardware Installation Guide for the Cisco 900 Series Integrated Services Router
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CHAPTER 1
Overview of Cisco 900 Series Integrated Services
Routers
Cisco 900 Series Integrated Services Routers (ISRs) with Cisco IOS Software are high-performance devices
that are easy to deploy and manage. The routers combine Internet access, comprehensive security, and wireless
services (LTE Advanced 3.0, Wireless WAN and Wireless LAN).
• About Cisco 900 Series Integrated Service Routers, on page 1
• Periodic Inspection and Cleaning, on page 7
About Cisco 900 Series Integrated Service Routers
The Cisco 900 series Integrated Services Routers are the SOHO routers that offer unmatched throughput
levels. They are available in fixed form factors. The Cisco 900 series is best suited for small and midsize
businesses, enterprise branches and as customer premises equipment in managed services environments.
Table 1: Base models of the Cisco 900 series ISR
DSLConsole PortsWAN PortsSwitch PortsModel
None124C921-4P
None124C921J-4P
1114C926-4P
1114C927-4P
1114C927-4PM
None124C931-4P
For more information on the features and specifications of Cisco 900 Series Integrated Services Routers
(ISRs), refer to the Cisco 900 Series Integrated Services Routers datasheet.
Hardware Installation Guide for the Cisco 900 Series Integrated Services Router
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Chassis Views
Chassis Views
Overview of Cisco 900 Series Integrated Services Routers
This section contains front and back panel views of the Cisco 900 Series ISR-showing locations of the power
and signal interfaces, interface slots, status indicators, and chassis identification labels.
Figure 1: Cisco C921-4P- I/O View
Power button2#6-32 Ground screw1
Figure 2: Cisco C921J-4P - I/O View
Console Port4Reset button3
GE LAN port6USB2.0 port5
GE LAN port8GE LAN port7
GE WAN port10GE LAN port9
VPN LED12GE WAN port11
Power button2#6-32 Ground screw1
Hardware Installation Guide for the Cisco 900 Series Integrated Services Router
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Reset button412VDC input3
VPN LED6System LED5
GE LAN port8USB2.0 port7
GE LAN port10GE LAN port9
Overview of Cisco 900 Series Integrated Services Routers
Figure 3: Cisco C926-4P- I/O View
Chassis Views
GE WAN port12GE LAN port11
Console port14GE WAN port13
Kensington Lock15
Power button2#6-32 Ground screw1
Figure 4: Cisco C927-4P - I/O View
Reset button412VDC input3
USB2.0 port6System LED5
DSL port8xDSL CD LED7
Console port10xDSL DATA LED9
GE LAN port12GE WAN port11
GE LAN port14GE LAN port13
VPN LED16GE LAN port15
Power button2#6-32 Ground screw1
Reset button412VDC input3
USB2.0 port6System LED5
DSL port8xDSL CD LED7
Console port10xDSL DATA LED9
Hardware Installation Guide for the Cisco 900 Series Integrated Services Router
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Chassis Views
Overview of Cisco 900 Series Integrated Services Routers
GE LAN port12GE WAN port11
GE LAN port14GE LAN port13
VPN LED16GE LAN port15
Figure 5: Cisco C927-4PM - I/O View
Power button2#6-32 Ground screw1
Figure 6: Cisco C931-4P - I/O View
Reset button412VDC input3
USB2.0 port6System LED5
DSL port8xDSL CD LED7
Console port10xDSL DATA LED9
GE LAN port12GE WAN port11
GE LAN port14GE LAN port13
VPN LED16GE LAN port15
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Power button2#6-32 Ground screw1
Console port4Reset button3
GE LAN port6USB2.0 port5
Overview of Cisco 900 Series Integrated Services Routers
LED Indicators
The following figures and table summarize the LED indicators that are located in the bezel or chassis of the
900 series.
Figure 7: LED Indicators on Ethernet SKUs- I/O Side
LED Indicators
GE LAN port8GE LAN port7
GE WAN port10GE LAN port9
VPN LED12GE WAN port11
Figure 8: LED Indicators on DSL SKUs- I/O Side
LAN LED2Power LED1
LAN LED4LAN LED3
WAN LED6LAN LED5
VPN LED8WAN LED7
xDSL CD LED2System LED1
WAN LED4xDSL DATA LED3
LAN LED6LAN LED5
LAN LED8LAN LED7
VPN LED9
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Power Supply
Overview of Cisco 900 Series Integrated Services Routers
The following table summarizes the LED indicators that are located in the chassis of the Cisco ISR 900 series
routers.
Table 2: LED Indicators for Cisco ISR 900 Series Routers
DescriptionLED ColorPort
System is offOFFSYS
Blink
Amber(blink)
GreenVPN OK
Green(Solid)LAN
Green (Blinking)
Green(Solid)WAN
Green (Blinking)
Boot up phase or in ROM Monitor
mode
Normal operationSteady on
Thermal tripAmber(steady)
ROMMON code signing
verification failure
At least one VPN session is active
VPN not connectedOFF
LAN connection is established.
Data transmission is happening on
the link.
LAN is not connectedOFF
WAN link is established
Data transmission is happening on
the link.
WAN link is not connected.OFF
Power Supply
The product power specifications for external power supply units are as follows:
• AC input voltage: Universal 100 to 240 VAC
• Frequency: 50 to 60 Hz
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OFFDSL CD
Green(Blinking)
Shut
Training, or no shut and cable
disconnected.
TrainedGreen (solid)
ShutOFFDSL Data
TX/RX DataGreen(Blinking)
Overview of Cisco 900 Series Integrated Services Routers
Specifications of Cisco 900 Series Integrated Services Routers
• Maximum output power: 18W or 30W depending on the SKU
• Output voltage: +12VDC for system power
Specifications of Cisco 900 Series Integrated Services Routers
For specifications on the Cisco 900 Series ISRs, refer to the Cisco 900 series Specifications document.
Periodic Inspection and Cleaning
We recommend to periodically inspect and clean the external surface of the router to minimize the negative
impact from environmental dust or debris. The frequency of inspection and cleaning is dependent upon the
severity of the environmental conditions, but we recommend a minimum once in every six months. Cleaning
involves vacuuming router air intake and exhaust vents.
Note
Sites with ambient temperatures consistently above 25°C and with potentially high levels of dust or debris
might require periodic preventative maintenance cleaning.
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Periodic Inspection and Cleaning
Overview of Cisco 900 Series Integrated Services Routers
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