user manual

Configuring Headend Broadband Access Router Features
Spectrum Management
MC-532
Cisco IOS Multiservice Applications Configuration Guide
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)