Is this right? related to Voice over IP

MACattack

Well another question that is very unclear to me. I hope you could help me with this question I got from the Study guides.

Here's the question:
Which two statements are true of packetization of voice? (Choose two.) (Source: Calculating Bandwidth Requirements)
A) The shorter the packetization period, the smaller the IP packet size.
The longer the packetization period, the smaller the IP packet size.
C) The longer the packetization period, the lower the packet rate.
D) The shorter the packetization period, the lower the packet rate.
E) The longer the packetization period, the lower the codec bandwidth.

As far as I know here is the answer but it is not mentioned on any of the listed above

A higher packetization period results in a larger IP packet size, because of the larger payload (the digitized voice samples). However, a higher packetization period results in a lower packet rate, reducing the IP overhead because of the smaller number of packets that must be generated.


If I have 20 ms ( packetization period ) with packet rate of 1/.02 = 50 pps
If i used code g.711 it will be 160 bytes not included the RTP overhead
If I have 30 ms with packet rate of 1/.02 = 33.33 pps
If i used code g.711 it will be 240 bytes not included the RTP overhead

As mentioend on the book packetization period express in ms
packetization size express in bytes
packet rate express in packet per sec's

This means longer packetization period increase the IP packet right or wrong?

a higher packetization period results in a lower packet rate, reducing the IP overhead because of the smaller number of packets that must be generated.

Okay the above is clear, the more longer the packetizatioin period the less packet rate i will get but the more packetization period the more packetizxation size i get.

NOW my answer is not listed in any of the options.
Can you help me clear this

scheistermeister

A and C are the answers.

This means longer packetization period increase the IP packet right or wrong?

It increases the IP packet payload.

a higher packetization period results in a lower packet rate, reducing the IP overhead because of the smaller number of packets that must be generated.

Okay the above is clear, the more longer the packetizatioin period the less packet rate i will get but the more packetization period the more packetizxation size i get.

Correct

That is this option:

C) The longer the packetization period, the lower the packet rate.

The other correct option is this:

A) The shorter the packetization period, the smaller the IP packet size.

But with A you have more header overhead because you are generating more packets.

EdTheLad

MACattack wrote:

Here's the question:
Which two statements are true of packetization of voice? (Choose two.) (Source: Calculating Bandwidth Requirements)
A) The shorter the packetization period, the smaller the IP packet size.
The longer the packetization period, the smaller the IP packet size.
C) The longer the packetization period, the lower the packet rate.
D) The shorter the packetization period, the lower the packet rate.
E) The longer the packetization period, the lower the codec bandwidth.

Packetization i.e. putting data into packets.
A) The shorter the time allowed putting data into packets the smaller the ip packet.
C) The longer time allowed putting data into packets mean packets are going to be bigger, the bigger packets means less packets will be sent.

MACattack

Yes I am corect A and C but when I check my answer at the last porttion of the module it mentioned B and C.

EdTheLad

No, if you had to ask the question, you were wrong.

scheistermeister

MACattack wrote:

Yes I am corect A and C but when I check my answer at the last porttion of the module it mentioned B and C.

I just checked my book and it does say B and C, but it is retarded. I even found it in the book (I have it in PDF) where it tells the right answer.

MACattack

scheistermeister, you saw it also it did mentioned on the last portion of module.
B and C and actually my answer is A and C

as more voice puts into packets, the larger the payload will be but less ip overhead.

MACattack

The longer the packetization period, the smaller the IP packet size

(20 ms )

---

160 bytes
30 ms

---

240 bytes
40 ms

---

320 bytes

From the above answer for me this is wrong

as packetization period goes larger the size of the packet becomes bigger.
What I know is the smaller the packetization period the less packet size and packet rate will increase.
1/20 * 1000 = 50
1/30 * 1000 = 33.33
1/40 * 1000 = 25
1/50 * 1000 = 20

Which we know that if the packet rate is to high it might cause delay.


The question and answer is so weird.....

EdTheLad

If i want to fill a bucket of water, which of the following is correct?
a) the longer i leave the water running the more water will be in the bucket.
b) the longer i leave the water running the less water will be in the bucket.

Difficulty rating equal to your original question.

ITdude

EdTheLad wrote:

If i want to fill a bucket of water, which of the following is correct?
a) the longer i leave the water running the more water will be in the bucket.
b) the longer i leave the water running the less water will be in the bucket.

Difficulty rating equal to your original question.

Are you implying that he is all wet?