Cisco Systems uBR7200 manual Spectrum Management

Configuring Headend Broadband Access Router Features

Spectrum Management

Per-Modem and per-Host Access Lists

Per-modem and per-host access lists allow Cisco uBR7200 series routers to filter incoming packets from individual hosts or cable modems based on the source MAC or IP address. Access lists can thus be specified on a per-interface or a per-address basis. The packets received from cable modems or individual hosts are filtered based on the cable modem or host from which the packets are received.

You can preconfigure the filters by using the CLI following standard Cisco IOS access list and access group configuration procedures. You can assign these filters to a user or modem by using the CLI or SNMP.

This feature also supports traps to inform the CMTS about the online/offline status of modems.

Basic Wiretap Support

Cisco uBR7200 series routers provide support for a basic wiretap facility for VoIP calls, as required by the United States Federal Communications Assistance for Law Enforcement Act (CALEA). The wiretap facility is based on the MAC address of the cable modem, so it can be used for either data or digitized voice connections.

The feature is controlled by the cable intercept command, which requires a MAC address, an IP address, and a UDP port number as its parameters. When activated, the Cisco uBR7200 series universal broadband router examines each packet for the desired MAC address; when a matching MAC address is found (for either the origination or destination endpoint), a copy of the packet is encapsulated into a UDP packet, which is then sent to the specified server at the given IP address and port.

Inter-Switch Link Bridging on Noncable Interfaces

Inter-Switch Link (ISL) is a Cisco protocol used to interconnect multiple routers and switches and maintain virtual LAN (VLAN) information as traffic passes between routers and switches.

Integrated Time-of-Day Server

Cisco uBR7200 series routers are able to obtain the correct time-of-day (ToD) and respond to (RFC 868) queries from cable modems during the registration process.

Integrated DHCP Server

Cisco uBR7200 series routers offer an integrated DHCP server to simplify the provisioning of cable modems.

Spectrum Management

Due to the nature of CATV technology, upstream noise management is a significant issue. Frequency bands must have a sufficient carrier-to-noise ratio (CNR) and carrier-to-ingress power ratio to support the transmission of quadrature phase-shift keying (QPSK) and quadrature amplitude modulation (QAM)

Cisco IOS Multiservice Applications Configuration Guide

MC-532