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Sidewinder G2 6.1.1 Administration Guide - Glossary of Technical ...

Sidewinder G2 6.1.1 Administration Guide - Glossary of Technical ...

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Creating Multimedia Application Defenses<br />

Required—Select this option to allow only the codecs required by<br />

H.323 for compliance.<br />

Required + Low Bandwidth Audio—Select this option to allow the<br />

required H.323 codecs as well as low bandwidth options.<br />

Required + All Audio—Select this option to allow all H.323 codecs<br />

except the codecs that allow video.<br />

Required + All Audio + Video—Select this option to allow all available<br />

H.323 codecs.<br />

Custom—Select this option to specify which codecs you want to<br />

allow. To allow a codec, select the appropriate check box. A check<br />

mark appears in the corresponding check box when a codec is<br />

allowed.<br />

Select All—Click this button to select all <strong>of</strong> the H.323 codecs (all<br />

codecs will be selected).<br />

Deselect All—Click this button to deselect all <strong>of</strong> the H.323 codecs<br />

(all codecs will be deselected).<br />

Note: If you select an option other than Custom and then make modifications to the<br />

selected codecs, the Custom option will automatically become selected.<br />

The following list provide an example <strong>of</strong> codecs commonly used by<br />

Micros<strong>of</strong>t’s NetMeeting:<br />

G.711—The G.711 codec options can transmit audio at 48, 56, and<br />

64 kB per second (kBps). Select this codec for audio that is being<br />

passed using high speed connections.<br />

G.723—The G.723 codec options determine which format and<br />

algorithm will be used for sending and receiving voice<br />

communications over a network. This codec transmits audio at 5.3<br />

and 6.3 kBps, which will reduce bandwidth usage.<br />

H.261—The H.261 codec will transmit video images at 64 kBps<br />

(VHS quality). Select this codec for video that is being passed<br />

using high speed connections.<br />

H.263—The H.263 codec determines which format and algorithm<br />

will be used to send and receive video images over a network.<br />

This codec supports common interchange format (CIF), quarter<br />

common interchange format (QCIF), and sub-quarter common<br />

interchange format (SQCIF) picture formats. It is also a good match<br />

for Internet transmission over low-bit-rate connections (for<br />

example, a 28.8 kBps modem).<br />

Configuring Application Defenses 6-37

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