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Product Overview
This chapter describes the Cisco CVA122/CVA122E Cable Voice Adapter and its interaction with the
Cable Modem Termination System (CMTS)—the cable system headend equipment that provides
Internet (TCP/IP) connectivity for subscribers over the cable broadband infrastructure. The chapter
provides physical and functional overviews of the Cisco CVA122/CVA122E Cable Voice Adapter.
Cisco CVA122/CVA122E Cable Voice Adapter Description
This section provides an overview of the Cisco CVA122/CVA122E Cable Voice Adapter, its hardware,
and its basic operation:
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Introduction
The Cisco CVA122 Cable Voice Adapter and Cisco CVA122E Cable Voice Adapter function at the most
basic level as a cable modem—a modulator/demodulator that provides high-speed network access on
the cable television system to residential subscribers. The two models are based on
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Unless otherwise indicated, all information in this manual applies to both the
Note
Cisco CVA122 and Cisco CVA122E Cable Voice Adapters.
OL-0799-02 (05/2001)
Introduction
Initial Power-On and Provisioning
Data Operations
Voice Operations
The Cisco CVA122 Cable Voice Adapter is based on the Data-Over-Cable Service Interface
Specifications (DOCSIS), a standard developed with service providers to ensure that any
DOCSIS-certified cable modem can interoperate with any bidirectional, DOCSIS-qualified CMTS.
The DOCSIS standard supports the North American National Television Systems Committee
(NTSC) channel plan, with 6 MHz channel widths, a downstream range of 88 to 860MHz, and an
upstream range of 5 to 42 MHz.
The Cisco CVA122E Cable Voice Adapter is based on the European Data-Over-Cable Service
Interface Specifications (EuroDOCSIS), which is almost identical to the DOCSIS standard, except
that it supports the European Phase Alternating Line (PAL) and Systeme Electronique Couleur
Avec Memoire (SECAM) channel plans, with 8 MHz channel widths, a downstream range of 88 to
860MHz, and an upstream range of 5 to 65 MHz.
C H A P T E R
Cisco CVA122/CVA122E Hardware Installation Guide
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Table of Contents
Troubleshooting
