@leogz 

HI and thank you for your reply, but even the main Deco dos not geve me good speed now is less than 150 win I very cloos to main Dico. My pc connect to rawter by ether net and it gev me full speed, and as I Mansion before I get SNR more than 38db. but the prablem from main deco. 

@Hisham_A You make speed test via Ethernet? Try this, put ethernet cable on slave deco and make it, this is a real backhaul speed between slave and other deco. Remeber wifi clients can be slow than cable tests. 

After valid cable tests in all slaves repeat via wifi. 

@leogz 

hi 

test resault as fallw:

1- pc conected by etharnet to raoter direct ===============================> speed full 520 Mbb

2- Pc conected by etharnet to Main Deco that conected to Raoter by etharnet ====> speed 92 Mbb

3- pc conected by etarnet to Slave Deco that conected to Main Deco wirless =====> Speed 89 Mbb

4- Pc conected to Main Deco by WiFi ==================================> Speed 73

5 Pc conected to Slave Deco By WiFi ==================================> Speed 71

so from the resault i can sae the Main Deco have praplem geting full speed from Raoter. Why?

@Hisham_A you can check if you main Deco was connected and 1000mbps not 100mbps on Router, i think auto-negotiation fail with router and limit your connection to 100mpbs to main deco. Due this you got always below 100mbps on Deco network. If your router have option to force negotiation , force 1000mpbs @ deco port. Make no sense this speeds on main deco. 

Which cable you use on main deco to link on main router? Cable provide by deco kit? Cat 5/5e or 6?

Take a look on wifi of slave deco , you have less than 15% speed loss , really accepted loss speed on wifi backhaul

leogz wrote

Which cable you use on main deco to link on main router? Cable provide by deco kit? Cat 5/5e or 6?

@leogz  i use Cat 6

@Hisham_A Change Deco port and router port ! Which model is your router?

leogz wrote

@Hisham_A Change Deco port and router port ! Which model is your router?

@leogz 

I changed the port but nothing changed. my Router is Huawei DG8245W2-10

leogz wrote

@Hisham_A Change Deco port and router port ! Which model is your router?

@leogz 

leogz wrote

@Hisham_A Change Deco port and router port ! Which model is your router?

@leogz  

i think its becouse of the firmware min is 1.3.2 and i can't upgraed it gev me i have the latest firmware.