Prerequisites - Cisco uBR905 Installation Manual

Site Requirements

Prerequisites

Before going to a subscriber site to install the Cisco uBR905 cable access router, verify that the
following have been done:
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Cisco uBR905 Router Hardware Installation Guide
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Ensure that a coaxial cable connection is run from the cable TV trunk to the subscriber building or
residence.
Cisco recommends that a dedicated (new) CATV coaxial cable drop be run from
the grounding block directly to the Cisco uBR905 cable access router. If such a
drop is not available, careful qualification of existing cable is often necessary.
Cable ground should be connected to the grounding system of the building or
residence as close to the point of cable entry as practical. For the United States,
refer to the National Electrical Code Section 820-40 guidelines for proper
grounding.
Verify that each subscriber site is characterized at the headend to support upstream transmission
and meets DOCSIS upstream and downstream RF requirements. Observe procedures in the NCTA
Recommended Practises for Measurements on Cable Television Systems. Also see the "CATV
Coaxial Cabling" section on page 2-5.
Some sites specify that high pass filters must be installed on every tap drop that does not carry
upstream data, voice, or IPPV services.
Installing a high pass filter between the Cisco uBR905 router and the headend
prevents the router from connecting to the headend—in this situation, the
provisioning process fails and the router's US LED never comes on.
Ensure that all required headend routing and network interface equipment is installed, configured,
and operational. Ensure that DHCP, Cisco IOS images, and configuration files have been created
and pushed to appropriate servers such that each Cisco uBR905 router, when initialized, can
transmit a DHCP request, receive an IP address, obtain TFTP and ToD server addresses, and
download a configuration file (and updated software image) in compliance with DOCSIS and the
procedures in place for your network.
Verify that all PCs at all subscriber locations meet the minimum computing requirements. See the
"PC Subsystem" section on page 4-8 for procedures to verify TCP/IP and DHCP PC settings when
onsite.
Each service provider will have its own recommendations and requirements for the CPE devices
connected to its network. However, at the very minimum a PC should have a 33 MHz 486 processor
(a 75-MHz Pentium or greater processor is recommended); 16 MB of RAM; Windows for
Workgroups for 486-based PCs and Windows 95 (or higher) for Pentiums; an Internet browser.
The PC must also have an installed Ethernet Network Interface Card (NIC). TCP/IP networking
software must also be installed and DHCP must be enabled. In addition, Internet connectivity must
be set for the Ethernet interface.
This recommendation is for Internet access in general and is not specific to the
Cisco uBR905 cable access router. Other operating systems and hardware
platforms of comparable capability may be supported by your service provider.
Chapter 2 Preparing for Installation
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