Specifications and Cables

This appendix provides system, port, and cabling specifications for the Cisco 831 and SOHO 91 routers.

System Specifications

Table A-1 outlines the system specifications for the routers.

Table A-1 System Specifications 

Description
Design Specification
Physical Dimensions
 

Dimensions (H x W x D)

2.0 x 9.7 x 8.5 in. (51 x 246 x 216 mm)

Weight (does not include desktop power supply)

1.5 lb (0.68 kg)

Environmental Operating Ranges
 

Nonoperating temperature

-4 to 149°F (-20 to 65°C)

Nonoperating humidity

5 to 95% relative humidity

Nonoperating altitude

0 to 15,000 ft (4570 m)

Operating temperature

32 to 104°F (0 to 40°C)

Operating humidity

10 to 85% relative humidity

Operating altitude

0 to 10,000 ft (3000 m)

Router Power
 

AC input voltage

100 to 240 VAC

Frequency

50 to 60 Hz

Power consumption

Maximum of 18W

Voltage

18 VDC


For information on regulatory compliance, refer to the Regulatory Compliance and Safety Information for Cisco 800 Series and SOHO Series Routers document that was shipped with your router.

Warning Ultimate disposal of this product should be handled according to all national laws and regulations.

LAN Port

The Cisco 831 and SOHO 91 routers provide a fixed onboard LAN connection, which has a 10/100-Mbps wire-speed non-blocking switch controller that performs the 10BASE-T/100BASE-T Ethernet switch operation. The automatic medium dependent interface in normal mode (MDI)/medium dependent interface in crossover mode (MDIX) crossover function eliminates the need for crossover cables. Table A-2 provides pinouts for the Ethernet LAN port on the routers.

Table A-2 Ethernet LAN Port

Pin
Function

1

RX+

2

RX-

3

TX+

4

Unused

5

Unused

6

TX-

7

Unused

8

Unused


Console Connector Pinouts

Table A-3 provides pinouts for console connector (for connecting a terminal or PC).

Table A-3 Console Connector Pinouts (RJ-45)

Pin
Function

1

RTS

2

DTR

3

TXD

4

GND

5

GND

6

RXD

7

DSR

8

CTS


The console port is configured as a data communications equipment (DCE) device. The default parameters for the console port are as follows:

•9600 baud

•8 data bits

•No parity

•One stop bit

Cabling Specifications

This section provides specifications for the following Ethernet cables, which you might need to provide:

•Straight-through cable

•Crossover cable

Thanks to the auto-crossover (autosensing) function, both straight-through and crossover cables can be used for the Ethernet LAN port.

Ethernet Cable Specifications

Table A-4 provides the specifications for straight-through and crossover Ethernet cables.

Table A-4 Ethernet Cable Specifications

Type
Category

10BASE-T

Category 3 or 5

100BASE-T

Category 5 or above


Maximum Cable Distance

Table A-5 provides the maximum distance of Ethernet cables that you can use to connect equipment to the router.

Table A-5 Maximum Cable Distance

Cable
Maximum Distance

Ethernet cables

328 ft (100 m)