Cisco Systems UBR900 specifications Data Operations, Telecommuter

Feature Overview

In firewall mode, the Cisco uBR900 series cable access router provides a high-speed Internet connection for an office’s local network while protecting the computers on the office network from common attacks such as denial of service attacks and destructive Java applets, as well as real-time alerts of such attacks.

The Small Office feature set can be optionally extended with support for IPSec encryption to ensure that the traffic passed over the Internet cannot be intercepted. You can select either standard 56-bit IPSec Network Security encryption or high-security 168-bit Triple Data Encryption Standard (DES) encryption.

Telecommuter

In addition to full DOCSIS 1.0 support and all of the functionality of the Easy IP feature set, the Telecommuter feature set supports IPSec encryption and the Layer 2 Tunneling Protocol (L2TP), which can establish secure high-speed Internet connections between employees’ homes and the office local network.

IPSec is an IP security feature that provides robust authentications and encryption of IP packets for the secure transmission of sensitive information over unprotected networks such as the Internet. You can select either standard 56-bit IPSec Network Security encryption or high-security 168-bit Triple Data Encryption Standard (DES) encryption.

L2TP is an extension of the Point-to-Point Protocol (PPP) that allows computers on different physical networks to interoperate as if they were on the same local area network (LAN). These features are important components for Virtual Private Networks (VPNs).

Note The Telecommuter feature set does not require the firewall feature set because the individual telecommuter has a secure connection to the office network. The office network, however, should implement a firewall for its own connection to the Internet.

Data Operations

Figure 1 illustrates a typical broadband data cable system. Data transmitted to a Cisco uBR900 series cable access router from the service provider’s CMTS shares a 27 or 26 Mbps, 6 MHz data channel in the 88 to 860 MHz range. The Cisco uBR900 series cable access router shares an upstream data rate of up to 10 Mbps on a 200 kHz-wide to 3.2 MHz-wide channel in the 5 to 42 MHz range.

Note End-to-end throughput varies based on the design and loading of network components, the mix of traffic, the processing speed and interface of the host server(s), the processing speed and local Ethernet performance of the subscriber’s computer, as well as other parameters. Since the network can be configured to support multiple levels of service to meet differing market price/performance requirements, the subscriber’s service level agreement also affects throughput. DOCSIS further contains some fundamental performance limitations because standards are designed to give a larger number of customers good performance, rather than permitting a few users to consume the entire capacity.

4Cisco IOS Release 12.0(7)T