Rx level is the measure of power what we get at the recieving end.
Rx level value is different for every different application
e.g In microwave link it is between -30dBm to -60dBm n this is planned accordingly.
whereas the RSL of a GSM handset of the GSM antenna (BTS End) is between -70dBm to -120 dBm or something like this value where the GSM system operates
this value is the measure of power so, this value should be there or this is the operating ranges in different different applications.
another word is Rx Quality this is the other name for BER i.e Bit Error Rate, so BER defines the Rx quality. it means that lower the %ge of BER better the Rx quality.
thanx