General
LAN standard	Ethernet
LAN ports	4 xRJ45
WAN interface	ISDN 1xBRI
a/b ports	2 xRJ11
Console port	RJ45
Flash memory	8 MB
DRAM memory	4 MB
Device status	refurbished

The Cisco 803 is an ISDN router from the 800 series, specifically designed for use in small offices and mobile workstations. It enables the connection of local networks via ISDN links and offers support for Cisco IOS technology, which stands for security, reliability, and scalable network functions. The device features an integrated LAN interface with four RJ45 ports, functioning as an Ethernet hub, as well as a WAN interface with one ISDN-BRI connection (1xBRI) and two RJ11 ports for analog telephones or modems. A console port (RJ45) allows for local configuration and maintenance of the router. The device is available as a used, refurbished unit, and the configuration must be reset to factory defaults before use.

Applications

The Cisco 803 is suitable for small businesses, home offices, and branch structures requiring a cost-effective and secure network connection via ISDN. It supports applications such as secure internet access, virtual private networks (VPNs), Point-of-Sale systems, and the integration of telephones and fax machines via the integrated RJ11 ports. The combination of router functionality and an integrated 4-port Ethernet hub reduces the need for additional networking hardware.

Functions and Equipment in Detail

The device features a flash memory with 8 MB capacity, used for storing firmware and configuration files, as well as a DRAM memory with 4 MB, used during runtime for processing network data and routing tables. The LAN interface supports the Ethernet standard and provides four RJ45 connections that function as a hub to connect multiple end devices within the local network. The WAN interface includes one ISDN-BRI connection (1xBRI), used for data transmission over digital telephone lines, as well as two RJ11 ports suitable for connecting analog telephones, fax machines, or modems. The console port (RJ45) is used for local administration and configuration of the device via a serial connection.

Technology Explained Simply

ISDN technology (Integrated Services Digital Network) enables the transmission of voice, data, and images over digital telephone lines. The 1xBRI connection offers a data transfer rate of up to 144 kbit/s (two B-channels at 64 kbit/s each and one D-channel at 16 kbit/s), with the exact speed depending on the specific network connection. The integrated 4-port Ethernet hub function allows the connection of multiple end devices within the local network, with data transmission occurring via the Ethernet protocol. The use of Cisco IOS technology ensures a flexible and expandable network environment with support for various security and management functions.

Compatibility and Accessories

The Cisco 803 is compatible with ISDN networks and can be connected to analog telephones and fax machines via the RJ11 ports. The LAN ports support standard Ethernet devices such as PCs, printers, or network storage. The console interface requires a corresponding cable (e.g., RJ45-to-DB9) and terminal software for configuration. Devices from the Cisco 800 series can operate with various software feature sets, with the exact functionality depending on the installed IOS version.

Mounting and Installation

The device is designed as a desktop model and can be placed on a table or mounted in a rack, provided the physical mounting is not restricted by the hardware design. Installation requires connecting the LAN ports to end devices in the local network, connecting to the ISDN network via the BRI interface, and connecting telephones or fax machines to the RJ11 ports. Configuration is performed via the console port, and the configuration must be reset to factory defaults before making any settings.

Advantages in Operation

The Cisco 803 offers a compact solution for small networks supporting both data and voice communication over ISDN. The integrated 4-port Ethernet hub function reduces the need for additional hardware. Support for Cisco IOS technology enables flexible network management and advanced security features. The use of a used, refurbished device provides a cost-effective alternative to new equipment, with the requirement that the configuration must be reset before use.