How does an administrator ensure compliance with ITU-T G.114 latency requirements when deploying voice and video applications over routes that include a geostationary satellite?
A.
For voice and video applications over satellite, Cisco recommends using WAN optimization compression, which will save space or time of the transmission. The latency will then be below the recommended latency threshold for voice.
B.
Using G.729 voice codec Instead of G.711 voice codec will reduce the packet size and the latency to stay within the recommended threshold.
C.
The satellite is 35,786 km (22,236 miles) above sea level (from the equator), so an engineer will not get below 150 ms latency in one direction and will need to manage the expectation of the user.
D.
The application will work because it will be below the recommenced latency requirement If an engineer uses compressed headers to speed up the voice packets.
"
For satellite circuits, the expected latency can be in the range of 250 to 900 ms. For example, signals being relayed via geostationary satellites will need to be sent to an altitude of 35,786 km (22,236 miles) above sea level (from the equator) out into space and then back to Earth again. There is nothing an administrator can do to decrease latency in such scenarios because they can do nothing about increasing the speed of light or radio waves. All that can be done to address the effect of latency in these scenarios is to educate the user-base so that realistic performance expectations are set.
"
C
But in Cisco Guide is not explained
"The satellite is 35,786 km (22,236 miles) above sea level (from the equator)" :-)
That question should confuse by text length?
150ms is the key answer...
upvoted 2 times
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10 months, 3 weeks agoCuteRabbit168
11 months, 2 weeks agoDaKenjee
11 months, 1 week ago