無線網路信號強度疑問?
 

我在家中測試無線網路的信號
測得的值都是-xxdbm
-xx的值越小,信號越強嗎?
因為越靠近AP,信號的dbm越小
如-60dbm>-30dbm

但是我看我的無線網路卡規格都是
-91dBm @ 1Mbps
-89dBm @ 2Mbps
-87dBm @ 5.5Mbps
-86dBm @ 6Mbps
-85dBm @ 9Mbps
-82dBm @ 12Mbps
-80dBm @ 18Mbps
-78dBm @ 24Mbps
-77dBm @ 36Mbps
-76dBm @ 48Mbps
-73dBm @ 54Mbps
使指在小於-73dBm才有54Mbps的速度嗎

可是有時隔兩道牆後,信號只有-20dbm到-12dbm
但是信號格數只剩兩格

可不可以請哪位大大解釋一下

回覆: 無線網路信號強度疑問?
 

1) -30dBm > -60dBm
2) FER(frame error rate) means the ratio of recevied good packets to overall transimit packets

Sensitivity means beyond the limit in spec., the FER > 10% for G mode, FER >8 % for B mode

3) "-20dBm" or "-12dBm" is strong signal level. If there are two walls between AP and user. I think the signal stregth is very weak. So I think this value is unreliable.