# 4.4 iRSSoverlaoding
The following graphics presents the input parameters to activate when the overloading mechanism is to be simulated.
**Figure 107: Activation of the overloading feature in SEAMCAT**
The overloading mask is expressed in power (dBm) versus frequency offset (MHz) and is defined as a function in SEAMCAT.
**Figure 108: Setting of the overloading mask in SEAMCAT**
The filtering of the receiver is expressed in power (dB) versus frequency offset (MHz) and is defined as a function in SEAMCAT (see Figure 109). It is set by default to a constant value of zero.
Note that if the blocking attenuation mode in user-defined and the overloading feature have been selected, then a consistency check will remind you that the actual blocking response and the receiver filter are the same element and they should not be accounted twice.
**Figure 109: Example of filling the Rx filter function**
When a simulation is run the following results are extractable (see Section 12.3.4 for further details)
As an example, this means that for the following overloading mask presented in Figure 3 with a victim frequency of 908 MHz and an interfering frequency of 900 MHz, the delta frequency (i.e. frequency offset) is -8 MHz with an overloading treshold of -8.5 dB and a Rx filter value of 9 dB. This can be found from the log file as shown below in Figure 110.
[](https://wiki.cept.org/uploads/images/gallery/2026-04/HSGBixvqvMZCbAPP-image.png)
**Figure 110: Output from logfile**