Network Calculations

[thinboy]

Hi,

I need help with the following calculations i am having trouble with i dont want someone to do them just so me how to work them out they are as follows

• In a given system, IP packets are used to convey speech samples generated by various sources. For each source a sample is generated every 125 microseconds, and the sample is encoded using 8 binary bits. For a bit rate of 13 Mbps, how many sources can be accommodated?
• In a given system, IP packets are used to convey CD quality music samples generated by various sources. The sampling rate at each source is 44 KHz (44000 samples are made per second) and each sample is encoded using 16 binary bits. Assuming the bandwidth to be 100 Mbps, how many sources can be accommodated?

• Calculate the delay associated with the transmission of a packet (15 Kbytes long) from source to destination, with a physical distance

[RevBooter]

alrite dude! hows she going? this is my first reply, losing my virginity, first for everything :P. in my humble opinion... 1 microsecond is one millionth of a second(10−6). if there is 13mbps or 13631488 bits per second, or 13.631488 bits per microsecond... 1703.936 bits transferred in 125 microseconds... or one source.

yeah?! lol... been a while!

is this a masters, or phd question! now way this is undergrad!

[RevBooter]

sorry man one more thing 1 us(microsecond) is the cycle time of 1MHz.

[Banfa]

1 microsecond is one millionth of a second(10−6). if there is 13mbps or 13631488 bits per second, or 13.631488 bits per microsecond... 1703.936 bits transferred in 125 microseconds... or one source.

Unfortunately all of this is correct except the last (highlighted step) which is wrong.

[Banfa]

• In a given system, IP packets are used to convey speech samples generated by various sources. For each source a sample is generated every 125 microseconds, and the sample is encoded using 8 binary bits. For a bit rate of 13 Mbps, how many sources can be accommodated?
• In a given system, IP packets are used to convey CD quality music samples generated by various sources. The sampling rate at each source is 44 KHz (44000 samples are made per second) and each sample is encoded using 16 binary bits. Assuming the bandwidth to be 100 Mbps, how many sources can be accommodated?

The method I would use for this is calculate the bandwidth of the source in bps (or kbps or Mbps). Then having done that you can get the number of sources that can be accommodated by dividing the link bandwidth by the bandwidth per source.

• Calculate the delay associated with the transmission of a packet (15 Kbytes long) from source to destination, with a physical distance

Physical distance is not really relevant to electrical links (OK it is a bit but it is not normally thought of in those terms) it is normal to quantify the speed of link is bps which is not directly related to distanced travelled.

[RevBooter]

thats why you're the admin and im the newbie :P

[thinboy]

Can someone please do the calculations 4 me as they are
Thanks

[Cyberdyne]

Is this a homework question?

Can someone please do the calculations 4 me as they are
Thanks

[thinboy]

Hi,

Is not homework i need them for work

Thanks

[thinboy]

Hi,

Any chance someone could show me how to work each calculation out slowly in steps

Thanks

[Banfa]

It's really not hard, all you have to do is identify the amount of data that is passing in a given amount of time. The convert it to bits per second by multiplying by relevant factors.

Taking the first example

In a given system, IP packets are used to convey speech samples generated by various sources. For each source a sample is generated every 125 microseconds, and the sample is encoded using 8 binary bits. For a bit rate of 13 Mbps, how many sources can be accommodated?

You are told that a source generates an 8 bit sample every 125 microseconds. You need to convert that to bits per second before you compare it with the available bandwidth.

So what factor do you need to use to convert 125 micro seconds to 1 second?

If you times your given bit rate (8 bits per 125 microseconds) by the same factor you will convert it to bits per second.

That is always how you do it, identify how much data you are getting how often, then multiply it by a factor to convert it to bits per second.

[thinboy]

is there any chance someone could do them for me as i really need help

[thinboy]

Hi,

Is there any chance someone could please do these for me as i really need help with them

• In a given system, IP packets are used to convey speech samples generated by various sources. For each source a sample is generated every 125 microseconds, and the sample is encoded using 8 binary bits. For a bit rate of 13 Mbps, how many sources can be accommodated?
• In a given system, IP packets are used to convey CD quality music samples generated by various sources. The sampling rate at each source is 44 KHz (44000 samples are made per second) and each sample is encoded using 16 binary bits. Assuming the bandwidth to be 100 Mbps, how many sources can be accommodated?

Calculate the delay associated with the transmission of a packet (15 Kbytes long) from source to destination, with a physical distance between them of 106 m. The transmission rate is 10 Mbits/s. Assume the propagation speed of the signal in the transmission medium to be 2*10 8 m/s


Thanks

So Much

[thinboy]

Calculations

Hi,

Is there any chance someone could please do these for me as i really need help with them

• In a given system, IP packets are used to convey speech samples generated by various sources. For each source a sample is generated every 125 microseconds, and the sample is encoded using 8 binary bits. For a bit rate of 13 Mbps, how many sources can be accommodated?
• In a given system, IP packets are used to convey CD quality music samples generated by various sources. The sampling rate at each source is 44 KHz (44000 samples are made per second) and each sample is encoded using 16 binary bits. Assuming the bandwidth to be 100 Mbps, how many sources can be accommodated?

Calculate the delay associated with the transmission of a packet (15 Kbytes long) from source to destination, with a physical distance between them of 106 m. The transmission rate is 10 Mbits/s. Assume the propagation speed of the signal in the transmission medium to be 2*10 8 m/s


Thanks

So Much

[Banfa]

Please do not double post your questions.

Please do read this.

Please do attempt your problems yourself first and then post questions about the parts you do not understand.

Banfa
Administrator