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Cisco CVA122/CVA122E Hardware Installation Guide
OL-0799-02 (05/2001)
Chapter 3
Installing the Cisco CVA122/CVA122E Cable Voice Adapter
Verifying Installation
Step 6
Using an in-line attenuator, add 3 to 6 dB of attenuation between the cable voice adapter and the CATV
cable input.
Note
The addition of 3 to 6 dB of attenuation simulates the variation found in a cable
network over time and in relation to temperature. If you install a cable voice
adapter at a time of year when the temperature is cooler, this step might not be
necessary.
If you install a cable voice adapter at a time of year when the temperature is
warmer, this step might assist you in determining how the cable voice adapter will
function over time. If the cable voice adapter does not function properly with the
addition of attenuation, you should replace and reconfigure the coaxial cables at
the subscriber site.
Step 7
Reconnect the cable system to the cable voice adapter and recheck the network connection at one of the
PCs. Reload the previous web page or another URL to verify that you can still access the Internet.
Step 8
Disconnect the cable system again by unscrewing the cable connector at the back of the cable voice
adapter.
Step 9
Remove the in-line attenuator from the back of the cable voice adapter.
Step 10
Reconnect the cable system to the cable voice adapter and recheck the network connection at the PC as
in step 7.
VoIP Telephone Connection
If the subscriber has purchased Voice over IP (VoIP) services, use the following procedure to test the
VoIP network by making a telephone call over the cable and IP network:
Step 1
Pick up a telephone connected to one of the cable voice adapter’s voice ports. This signals an off-hook
condition. In response, the cable voice adapter’s voice software issues a dial tone and waits for a
telephone number to be dialed.
If you do not hear a dial tone, the cable voice adapter’s voice ports may be not enabled. Contact your
service provider for assistance.
Step 2
Dial a number for another telephone. This telephone could be one of the other telephones plugged in to
the cable voice adapter, or it could be a telephone on the public telephone switched network (PTSN).
The cable voice adapter turns on the codecs and protocols required to transmit packetized voice and the
call proceeds.
Any call-progress indications and other signals that can be carried in-band (for example, remote phone
ringing) are cut through the voice path as soon as an end-to-end audio channel is up. You either hear the
far end telephone ringing until the caller picks up or you hear a busy signal if the far end telephone is
already in use.
Step 3
When either end hangs up, the call is torn down. The session ends, with each end going idle, waiting
for another off-hook condition.
