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

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

Model

Switch Ports

WAN Ports

Console Ports

DSL

C921-4P

4

2

1

None

C921J-4P

4

2

1

None

C921-4PLTEGB

4

2

1

None

C921-4PLTEAU

4

2

1

None

C921-4PLTEAS

4

2

1

None

C921-4PLTENA

4

2

1

None

C926-4P

4

1

1

1

C926-4PLTEGB

4

1

1

1

C927-4P

4

1

1

1

C927-4PM

4

1

1

1

C927-4PLTEGB

4

1

1

1

C927-4PMLTEGB

4

1

1

1

C927-4PLTEAU

4

1

1

1

C931-4P

4

2

1

None

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.

Chassis Views

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

1

#6-32 Ground screw

2

Power button

3

Reset button

4

Console Port

5

USB2.0 port

6

GE LAN port

7

GE LAN port

8

GE LAN port

9

GE LAN port

10

GE WAN port

11

GE WAN port

12

VPN LED
Figure 2. Cisco C921J-4P - I/O View

1

#6-32 Ground screw

2

Power button

3

12VDC input

4

Reset button

5

System LED

6

VPN LED

7

USB2.0 port

8

GE LAN port

9

GE LAN port

10

GE LAN port

11

GE LAN port

12

GE WAN port

13

GE WAN port

14

Console port

15

Kensington Lock
Figure 3. Cisco C921-4PLTENA- I/O View

1

#6-32 Ground screw

2

4G antenna connector—M1/DIV

3

4G antenna connector—M0/MAIN

4

Power button

5

Reset button

6

Console port

7

USB2.0 port

8

GE LAN port

9

GE LAN port

10

GE LAN port

11

GE LAN port

12

GE WAN port

13

GE WAN port

14

Micro SIM port

15

SIM/ACT LED

16

Micro USB port

17

 VPN LED
Figure 4. Cisco C921-4PLTEAS- I/O View

1

#6-32 Ground screw

2

4G antenna connector—M1/DIV

3

4G antenna connector—M0/MAIN

4

Power button

5

Reset button

6

Console port

7

USB2.0 port

8

GE LAN port

9

GE LAN port

10

GE LAN port

11

GE LAN port

12

GE WAN port

13

GE WAN port

14

Micro SIM port

15

SIM/ACT LED

16

Micro USB port

17

 VPN LED
Figure 5. Cisco C921-4PLTEAU - I/O View

1

#6-32 Ground screw

2

4G antenna connector—M1/DIV

3

4G antenna connector—M0/MAIN

4

Power button

5

Reset button

6

Console port

7

USB2.0 port

8

GE LAN port

9

GE LAN port

10

GE LAN port

11

GE LAN port

12

GE WAN port

13

GE WAN port

14

Micro SIM slot

15

SIM/ACT LED

16

Micro USB port

17

RSSI LED

18

VPN LED
Figure 6. Cisco C921-4PLTEGB - I/O View

1

#6-32 Ground screw

2

4G antenna connector—M1/DIV

3

4G antenna connector—M0/MAIN

4

Power button

5

Reset button

6

Console port

7

USB2.0 port

8

GE LAN port

9

GE LAN port

10

GE LAN port

11

GE LAN port

12

GE WAN port

13

GE WAN port

14

Micro SIM slot

15

SIM/ACT LED

16

Micro USB port

17

RSSI LED

18

VPN LED
Figure 7. Cisco C926-4P- I/O View

1

#6-32 Ground screw

2

Power button

3

12VDC input

4

Reset button

5

System LED

6

USB2.0 port

7

xDSL CD LED

8

DSL port

9

xDSL DATA LED

10

Console port

11

GE WAN port

12

GE LAN port

13

GE LAN port

14

GE LAN port

15

GE LAN port

16

VPN LED
Figure 8. Cisco C926-4PLTEGB - I/O View

1

Antenna

2

Power button

3

12VDC input

4

Reset button

5

System LED

6

Micro USB

7

RSSI LED

8

SIM card slot

9

USB2.0 port

10

xDSL CD LED

11

Antenna

12

DSL port

13

xDSL DATA LED

14

Console port

15

GE WAN Port

16

GE LAN Port

17

GE LAN Port

18

GE LAN Port

19

GE LAN Port

20

SIM/ACT LED

21

VPN LED

22

#6-32 Ground screw
Figure 9. Cisco C927-4P - I/O View

1

#6-32 Ground screw

2

Power button

3

12VDC input

4

Reset button

5

System LED

6

USB2.0 port

7

xDSL CD LED

8

DSL port

9

xDSL DATA LED

10

Console port

11

GE WAN port

12

GE LAN port

13

GE LAN port

14

GE LAN port

15

GE LAN port

16

VPN LED
Figure 10. Cisco C927-4PM - I/O View

1

#6-32 Ground screw

2

Power button

3

12VDC input

4

Reset button

5

System LED

6

USB2.0 port

7

xDSL CD LED

8

DSL port

9

xDSL DATA LED

10

Console port

11

GE WAN port

12

GE LAN port

13

GE LAN port

14

GE LAN port

15

GE LAN port

16

VPN LED
Figure 11. Cisco C927-4PLTEGB - I/O View

1

Antenna

2

Power button

3

12VDC input

4

Reset button

5

System LED

6

Micro USB

7

RSSI LED

8

SIM card slot

9

USB2.0 port

10

xDSL CD LED

11

Antenna

12

DSL port

13

xDSL DATA LED

14

Console port

15

GE WAN Port

16

GE LAN Port

17

GE LAN Port

18

GE LAN Port

19

GE LAN Port

20

SIM/ACT LED

21

VPN LED

22

#6-32 Ground screw
Figure 12. Cisco C927-4PMLTEGB - I/O View

1

Antenna

2

Power button

3

12VDC input

4

Reset button

5

System LED

6

Micro USB

7

RSSI LED

8

SIM card slot

9

USB2.0 port

10

xDSL CD LED

11

Antenna

12

DSL port

13

xDSL DATA LED

14

Console port

15

GE WAN Port

16

GE LAN Port

17

GE LAN Port

18

GE LAN Port

19

GE LAN Port

20

SIM/ACT LED

21

VPN LED

22

#6-32 Ground screw
Figure 13. Cisco C927-4PLTEAU - I/O View

1

Antenna

2

Power button

3

12VDC input

4

Reset button

5

System LED

6

Micro USB

7

RSSI LED

8

SIM card slot

9

USB2.0 port

10

xDSL CD LED

11

Antenna

12

DSL port

13

xDSL DATA LED

14

Console port

15

GE WAN Port

16

GE LAN Port

17

GE LAN Port

18

GE LAN Port

19

GE LAN Port

20

SIM/ACT LED

21

VPN LED

22

#6-32 Ground screw
Figure 14. Cisco C931-4P - I/O View

1

#6-32 Ground screw

2

Power button

3

Reset button

4

Console port

5

USB2.0 port

6

GE LAN port

7

GE LAN port

8

GE LAN port

9

GE LAN port

10

GE WAN port

11

GE WAN port

12

VPN LED

LED Indicators

The following figures and table summarize the LED indicators that are located in the bezel or chassis of the 900 series.

Figure 15. LED Indicators on Ethernet SKUs- I/O Side

1

 Power LED

2

 LAN LED

3

 LAN LED

4

 LAN LED

5

LAN LED

6

WAN LED

7

WAN LED

8

VPN LED
Figure 16. LED Indicators on DSL SKUs- I/O Side

1

 System LED

2

 xDSL CD LED

3

 xDSL DATA LED

4

 WAN LED

5

LAN LED

6

LAN LED

7

LAN LED

8

LAN LED

9

VPN LED
Figure 17. LED Indicators on 4G LTE SKUs- I/O Side

1

 Power LED

2

 LAN LED

3

 LAN LED

4

 LAN LED

5

LAN LED

6

WAN LED

7

WAN LED

8

SIM/ACT LED

9

VPN LED

10

RSSI LED

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

Port

LED Color

Description

SYS

OFF

System is off

Blink

Boot up phase or in ROM Monitor mode

Steady on

Normal operation

Amber(steady)

Thermal trip

Amber(blink)

ROMMON code signing verification failure

VPN OK

Green

At least one VPN session is active

OFF

VPN not connected

LAN

 Green(Solid)

LAN connection is established.
Green (Blinking)

Data transmission is happening on the link.

OFF

LAN is not connected

WAN

Green(Solid)

WAN link is established

Green (Blinking)

Data transmission is happening on the link.

OFF

WAN link is not connected.

DSL CD

OFF

Shut

Green(Blinking)

Training, or no shut and cable disconnected.

Green (solid)

Trained

DSL Data

OFF

Shut

Green(Blinking)

TX/RX Data

RSSI

Green (Solid)

Signal > –60 dBm

Very strong signal

Yellow

60dBm > Signal > -75dBm

Strong signal

Yellow(blinking)

75dBm > Signal > -90dBm

Fair signal

OFF

Signal < –90 dBm

Unusable signal

SIM

OFF

No SIM

Steady on

SIM present in slot

Blink

TXD/RXD data

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

  • 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.