Could you explain this problem?

I can't understand that solution.
----
[Q]
Consider the queuing delay in a router buffer (preceding an outbound
link). Suppose all packets are L bits, the transmission rate is R bps,
and that N packets simultaneously arrive at the buffer every LN/R
seconds. Find the average queuing delay of a packet.

[A]
This is easy, you just sum up...
L/R + 2L/R + ... + (n - 1)L/R = L(n - 1)/2R
----
Is it right?
Who can explain the solution to me?

"(E-Mail Removed)" <(E-Mail Removed)> writes:

>I can't understand that solution.
>----
>[Q]
>Consider the queuing delay in a router buffer (preceding an outbound
>link). Suppose all packets are L bits, the transmission rate is R bps,
>and that N packets simultaneously arrive at the buffer every LN/R
>seconds. Find the average queuing delay of a packet.

>[A]
>This is easy, you just sum up...
>L/R + 2L/R + ... + (n - 1)L/R = L(n - 1)/2R
>----
>Is it right?
>Who can explain the solution to me?

The first packet has zero delay, the second has L/R delay (the time to send
the first packet) the third as 2L/R ( the time to send the first two
packets), etc. Thus the average delay per packet is the sum of the delays
over the number of packets.

Do you mean actually the answer is L(n - 1) / 2Rn ?

and, thank you for advice...

On 2006-03-15, (E-Mail Removed) <(E-Mail Removed)> wrote:
> I can't understand that solution.
> ----
> [Q]
> Consider the queuing delay in a router buffer (preceding an outbound
> link). Suppose all packets are L bits, the transmission rate is R bps,
> and that N packets simultaneously arrive at the buffer every LN/R
> seconds. Find the average queuing delay of a packet.

This isn't really on-topic for a linux networking newsgroup. Next time,
would you consider posting to a generic networking newsgroup?

--keith

--
kkeller-(E-Mail Removed)
(try just my userid to email me)
AOLSFAQ=http://wombat.san-francisco.ca.us/cgi-bin/fom
see X- headers for PGP signature information

keith, I know it. But, actually I can't find a newsgroup for generic
networking.
If you know the newsgrouop, could you recommend for me?

anyway, I'm sorry to posting here...
Good day~