Table Of Contents

Product Overview

Features

Front Panel

LEDs

Back Panel

Router Ports

Switches

Switches on the Back Panel

S/T Termination Switch on the System Board

Product Overview

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The Cisco 811 and 813 routers connect small professional offices or telecommuters over Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) lines to corporate local area networks (LANs) and the Internet. The routers offer multiprotocol routing between LAN and WAN ports.

The ISDN BRI service provided by your telephone service provider offers two bearer channels (B channels) and one data channel (D channel). The B channel operates at 64 kbps and carries user data. The D channel operates at 16 kbps and carries control and signaling information, although it can support user data transmission under certain circumstances.

The Cisco 811 and 813 routers include both the ISDN U and ISDN S/T ports.

The ISDN U interface is a two-wire interface from the telephone switch that supports full-duplex data transfer over a single pair of wires. The Cisco 811 and 813 ISDN U interface supports the data service unit (DSU) feature that is integrated in the routers.

The ISDN S/T interface is a four-wire interface from the telephone switch that supports full-duplex data transfer over two pairs of wires. Telephone service providers typically provide an ISDN S/T interface. The Cisco 811 and 813 ISDN S/T interface supports the connection to an external DSU, from which you can connect a digital telephone and other network devices.

The Cisco 813 router supports data and voice applications. The data applications are implemented through the ISDN port. The voice applications are implemented with ISDN BRI and through the telephone ports.

Figure 1-1 shows an example of a network connected to a Cisco 813 router.

Figure 1-1 Example of a Network Connected to a Cisco 813 Router

Features

Table 1-1 summarizes the features of the Cisco 811 and 813 routers.

Table 1-1 Cisco 811 and 813 Feature Summary 

Feature	Description
10BaseT Ethernet ports	Connects to 10BaseT (10 Mbps) Ethernet networks, compatible with 10/100-Mbps devices.
Console port	Connects to terminal or PC for software configuration using command-line interface and for troubleshooting.
ISDN BRI S/T port	Connects to ISDN S/T network.
ISDN BRI U port	Connects to ISDN U network.
Telephone ports (Cisco 813 only)	Connects to telephone, fax machine, or modem, which are connected to telephone services through ISDN line.
Internal DSU	Eliminates need for an external DSU.
Flash memory	4 MB of Flash memory1 .
Dynamic RAM (DRAM)	8 MB of DRAM2 .
Easily distinguishable ISDN B-channel LEDs	ISDN B-channel LEDs in a different color from other LEDs.
Ease of installation	Color-coded ports and cables to reduce the chance of error.
Cisco IOS software	Supports Cisco IOS software.
Cisco 800 Fast Step application	A basic configuration tool for Windows 95, Windows 98, and Windows NT.
Locking power connector	Locks power connector in place.
Wall-mount feature	Brackets on router bottom provide a way to mount router on wall or vertical surface.

1 An additional 8 MB of Flash memory can be added at the factory or at your site. You can order an upgrade kit and have trained and qualified personnel add the memory. 2 An additional 8 MB of DRAM can be added at the factory or at your site. You can order an upgrade kit and have trained and qualified personnel add the DRAM.

Front Panel

Figure 1-2 and Figure 1-3 show the front panel of the Cisco 811 and 813 routers.

Figure 1-2 Cisco 811 Front Panel

Figure 1-3 Cisco 813 Front Panel

LEDs

Table 1-2 summarizes the function of each LED:

Table 1-2 LED Functions 

LED	Color	Function
OK	Green	On when power is supplied to the router and when the router completes the self-test procedure and begins operating.
PHONE 2, 1	Green	Cisco 813 router only. On when basic telephone service is in use.
ISDN DSU	Green	•On when the internal DSU and the ISDN switch are synchronized. •Blinks when the internal DSU and the ISDN switch are attempting to synchronize.
ISDN LINE	Green	On when the ISDN interface and the ISDN terminal device are synchronized.
ISDN B1	Orange	•Blinks when placing or receiving a call on the first ISDN B channel. •On when a call is connected on the first ISDN B channel.
ISDN B1 RXD	Orange	Blinks when packets are received from the first ISDN B channel.
ISDN B1 TXD	Orange	Blinks when packets are sent from the first ISDN B channel.
ISDN B2	Orange	•Blinks when placing or receiving a call on the second ISDN B channel. •On when a call is connected on the second ISDN B channel.
ISDN B2 RXD	Orange	Blinks when packets are received from the second ISDN B channel.
ISDN B2 TXD	Orange	Blinks when packets are sent from the second ISDN B channel.
ETHERNET 4, 3, 2	Green	Cisco 813 router only: •On when the Ethernet device is connected. •Off when the Ethernet device is not connected. •Blinks when the connection has a problem. See the "Troubleshooting" chapter.
ETHERNET 1	Green	•On when the Ethernet device is connected. •Off when the Ethernet device is not connected. •Blinks when the connection has a problem. Refer to the "Troubleshooting" chapter.
ETHERNET RXD	Green	Blinks when an Ethernet port receives a packet.
ETHERNET TXD	Green	Blinks when an Ethernet port sends a packet.

Back Panel

The back panel of the Cisco 811 and 813 routers contains the router ports and switches. Figure 1-4 shows the back panel of the Cisco 811 router, and Figure 1-5 shows the back panel of the Cisco 813 router.

Figure 1-4 Cisco 811 Router Back Panel

Figure 1-5 Cisco 813 Router Back Panel

Router Ports

Table 1-3 lists the router ports on the back panels of the Cisco 811 and 813 routers:

Table 1-3 Router Ports

Router	Ethernet Ports	ISDN U Ports	ISDN S/T Ports	Telephone Ports
Cisco 811	One	One	One	None
Cisco 813	Four	One	One	Two

Switches

Switches that control router functions are located on the back panels and system boards of the Cisco 811 and 813 routers.

Switches on the Back Panel

Table 1-4 describes the switches located on the back panels.

Table 1-4 Router Switches on the Back Panel 

Switch	Function
TO HUB/TO PC1	Determines the device and cable type that are connected to the ETHERNET 1 port: •Button in—Default setting. Connects to a hub. •Button out—Connects to a PC.
NOR/RVS	Normal/reverse switch. Controls the signals that are sent to the tip and ring wires of the ISDN U interface: •NOR (button in)—Default setting. Tip and ring. •RVS (button out)—Ring and tip.
DSU ON/OFF	Controls the access to the ISDN S/T signals of the integrated DSU module: •ON (button in)—Default setting. S/T signals of the DSU are connected. Used with an ISDN U connection. •OFF (button out)—S/T signals of the DSU are disconnected. Used with an ISDN S/T connection.

1 Settings for this switch assume that you use a straight-through cable. If you are not using a straight-through cable, see Table 3-1 for more information.

S/T Termination Switch on the System Board

The S/T termination dip switch is located on the system board of the
Cisco 811 and 813 routers and is not accessible from outside of the router. Figure 1-6 shows the location of the S/T termination dip switch.

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Warning Only trained and qualified personnel should be allowed to install or replace this equipment.

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Warning Before working on a system that has an on/off switch, turn OFF the power and unplug the power cord.

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Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages.

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Warning Do not work on the system or connect or disconnect cables during periods of lightning activity.

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Figure 1-6 S/T Termination Dip Switch on the Router System Board

The S/T termination dip switch consists of two buttons that work together to control the termination function of the S/T signals:

•OFF (both buttons)—Default setting. ISDN S/T signals are not terminated. Both buttons must be off if termination is not required.

•ON (both buttons)—ISDN S/T signals are terminated. Both buttons must be on for the termination to function.