Netopia 4741 2a4na User Guide
Voice Configuration 7-3
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Selecting Port Configuration displays the Por t Configuration screen.
Echo cancellation is set to Yes by default. With echo cancellation set to Yes, the device auto-detects
whether or not the connecting device (a telephone, a modem, or a fax machine) requires echo cancellation
(fax machines and modems automatically cancel echoes).
whether or not the connecting device (a telephone, a modem, or a fax machine) requires echo cancellation
(fax machines and modems automatically cancel echoes).
For ordinar y telephone handsets, echo cancellation should be set to Yes (turned on) to eliminate echoes
on the voice line. Toggling a por t to No forces echo cancellation to be disabled. If you want to disable echo
cancellation, toggle this item to No. You can enable or disable echo cancellation for each por t on the
Netopia 4741.
on the voice line. Toggling a por t to No forces echo cancellation to be disabled. If you want to disable echo
cancellation, toggle this item to No. You can enable or disable echo cancellation for each por t on the
Netopia 4741.
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The Compression type is normally set at the voice gateway. It is visible for informational purposes, to
ascer tain that the provisioning on the voice gateway is in sync with the Netopia 4741.
ascer tain that the provisioning on the voice gateway is in sync with the Netopia 4741.
LES stands for Loop Emulation Ser vice, an increasingly popular standard among ATM voice gateway
manufacturers.
manufacturers.
If the voice gateway is LES-compliant, a pop-up menu allows you to choose between G711 - PCM 64K and
G726 - ADPCM 32K. Your ser vice provider must supply you with the correct provisioning information. The
reason is that in those gateway types the voice gateway expects this type of provisioning to be done prior
to making any voice calls.
G726 - ADPCM 32K. Your ser vice provider must supply you with the correct provisioning information. The
reason is that in those gateway types the voice gateway expects this type of provisioning to be done prior
to making any voice calls.
If the voice gateway is not LES-compliant, the pop-up menus are not available, and these fields are for
information only.
information only.
Once you have made your settings for each voice por t, press Escape to return to the Voice Configuration
menu.
menu.
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Select Voice Coding and press Return. From the pop-up menu choose the voice coding method you will be
using. The default is mu-law, which is the standard 8-bit, 8 kHz, mono format intended primarily for the
requirements of voice in Nor th America. You can also choose a-law, a more common audio format outside
Nor th America.
using. The default is mu-law, which is the standard 8-bit, 8 kHz, mono format intended primarily for the
requirements of voice in Nor th America. You can also choose a-law, a more common audio format outside
Nor th America.
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If your ser vice provider is using an LES-compliant voice gateway, an LES Profile Number option becomes
Port Configuration
Port 1 Echo Cancellation Enabled: Yes
Compression is G711 - PCM 64K
Port 2 Echo Cancellation Enabled: Yes
Compression is G711 - PCM 64K
Port 3 Echo Cancellation Enabled: Yes
Compression is G711 - PCM 64K
Port 4 Echo Cancellation Enabled: Yes
Compression is G711 - PCM 64K
Compression is G711 - PCM 64K
Port 2 Echo Cancellation Enabled: Yes
Compression is G711 - PCM 64K
Port 3 Echo Cancellation Enabled: Yes
Compression is G711 - PCM 64K
Port 4 Echo Cancellation Enabled: Yes
Compression is G711 - PCM 64K
Return/Enter accepts * Tab toggles * ESC cancels.