Site Requirements - Cisco CVA122 Hardware Installation Manual

Chapter 2 Preparing for Installation
For safety, periodically check the resistance value of the antistatic strap. The measurement
Caution
should be between 1 and 10 megohm (Mohm).

Site Requirements

Before going to a subscriber site to install the Cisco CVA122/CVA122E Cable Voice Adapter, verify
that the following have been done:
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OL-0799-02 (05/2001)
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 cable drop be run from the
grounding block directly to the Cisco CVA122/CVA122E Cable Voice Adapter. 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 and according
to the local and national electrical regulations (for the United States, see 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 "Cabling"
section on page 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 cable voice adapter and the headend will
prevent the cable voice adapter from connecting to the headend.
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 CVA122/CVA122E Cable Voice Adapter,
when initialized, can transmit a DHCP request, receive an IP address, obtain TFTP and TOD server
addresses, and download a configuration file (and/or updated software image) in compliance with
DOCSIS and the procedures in place for your network.
Ensure that each subscriber site meets the operating requirements specified in the "Site
Requirements" section.
Ensure that all supported equipment at a subscriber site—PCs, telephones, modems, FAX devices,
Ethernet hub, and USB hub—is installed and operational. Ensure telephones at subscriber sites
support touch-tone (DTMF) dialing.
Verify that all PCs at all subscriber locations meet the minimum computing requirements. If using
USB connectivity, verify that the USB driver software has been installed; otherwise, verify that
Internet connectivity is set for the Ethernet interface. See the "PC Subsystem" section on page 4-10
for procedures to verify TCP/IP and DHCP PC settings when onsite.
Cisco CVA122/CVA122E Hardware Installation Guide
Site Requirements
2-3