one side show: associated and second side show: no carrier

Hello all,
 
first of all I would like to thank Sam L. and others how helped with
80211ieee and atheros driver. Your work in last months is great !
 
With new ath_hal in source in RELENG_6 I decided to buy 2 new Wistron WNC
CM10 with MAC chip AR5414A to connect 2 nodes with distance 3,5 km.
 
My problem is associated or not.
 
One side where is hostap show this:
 
# ifconfig ath1 list sta
ADDR               AID CHAN RATE RSSI IDLE  TXSEQ  RXSEQ CAPS ERP
00:0b:6b:XX:YY:ZZ    1  108   6M   33  180   1200     16 E      0 WME

RSSI=33, okay 33-95 = -62 dBm
 
A datasheet for CM10 said for receive sensitivity:
-85dBm_at_6Mbps
-67dBm_at_54Mbps
 
So theoretically the client should work with 6-54 Mbps/s without any
difference, because the RF signal is enough to associate even at 54Mbps/s.
 
Now go to client side, and what it show:
 
ifconfig -v ath0
 
ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::20b:6bff:fe2a:c78e%ath0 prefixlen 64 scopeid 0x2
        inet 10.40.64.18 netmask 0xfffffffc broadcast 10.40.64.19
        ether 00:0b:6b:XX:YY:ZZ
        media: IEEE 802.11 Wireless Ethernet OFDM/6Mbps mode 11a
        status: no carrier
        ssid PtP channel 108 (5540) bssid 00:00:00:00:00:00
        authmode OPEN privacy OFF deftxkey UNDEF powersavemode OFF
        powersavesleep 100 txpowmax 37 txpower 63 rtsthreshold 2346
        mcastrate 1 fragthreshold 2346 pureg protmode OFF wme burst
        roaming AUTO bintval 100
        AC_BE cwmin  4 cwmax 10 aifs  3 txopLimit   0 -acm ack
              cwmin  4 cwmax 10 aifs  3 txopLimit   0 -acm
        AC_BK cwmin  4 cwmax 10 aifs  7 txopLimit   0 -acm ack
              cwmin  4 cwmax 10 aifs  7 txopLimit   0 -acm
        AC_VI cwmin  3 cwmax  4 aifs  2 txopLimit  94 -acm ack
              cwmin  3 cwmax  4 aifs  2 txopLimit  94 -acm
        AC_VO cwmin  2 cwmax  3 aifs  2 txopLimit  47 -acm ack
              cwmin  2 cwmax  3 aifs  2 txopLimit  47 -acm

ifconfig ath0 list ap
 
SSID            BSSID              CHAN RATE  S:N   INT CAPS
PtP          00:0b:6b:XX:YY:ZZ  108   54M 24:0   100 E    WME

It said "no carrier".
 
RF signal on client side is lower, okay but 24-95 is -71dBm so it is enough
signal strength to associate to AP at the minimum 6 Mbps/s.
 
But it does not work. Any operation at both side like ifconfig ath0 down and
up do not help me.
 
How can hostap side say: "yes I see my client, it is accossiated to me with
this mac", and client say: "yes I see my ap, but I could not associate to
ap, even if I should associate to ap" ???
 
Any help is very appreciated.
 
P.S.: ath_hal, ath driver and ath sample rate is compiled to my custom
kernel.