Items and functions?

[ibmed]

Hi,
I've got a qestion about items. Is it possible to change data, that is obtained by agents?
For example, I get an amount of in-bytes on some ethernet card via SNMP agent. But I want to get current interface load. Since there is no such field in SNMP, I need to compute a simple formula: data amount/time between data obtaining.

So, what are the ways to get a load value from the data amount value? Is there a way to use Triggers expressions and functions in Items?

Changing the 'key' field in Item properties is obviously senseless. So is using a 'Multiplier' field, coz there's no obvious way to get a difference between last and previous value of data amount field.

Please, help!.. )

P.S.:
I beg a pardon for any mistakes..

[erisan500]

In the item configuration, change "Store value" from "as is" to "Delta speed per second).


Greetings

[ibmed]

Oh... thanks )
I feel ashamed...