•rate
•cl_updaterate
•cl_cmdrate

minimum  updaterate 40 
minimum  cmdrate    40    
minimum  rate       10.000  (20% home maximum download rate)
• home network download rate:- 50kbyte/sec (20%)
                             -400kbit/sec  (8/1)

updaterate 50 
cmdrate    50    
rate       15.000  (20% home maximum download rate)
• home network download rate:- 75kbyte/sec (20%)
                             -600kbit/sec  (8/1)

updaterate 75 
cmdrate    75    
rate       20.000  (20% home maximum download rate)
• home network download rate:-100kbyte/sec (20%)
                             -800kbit/sec  (8/1)

updaterate 75 
cmdrate    75
rate       25.000  (20% home maximum download rate)
• home network download rate:- 125kbyte/sec (20%)
               ( 1mbit/sec ) -1000kbit/sec  (8/1)

maximum  updaterate 101
maximum  cmdrate    101   
maximum  rate       25.000  (20% home maximum download rate)
• home network download rate:- 125kbyte/sec (20%)
               ( 1mbit/sec ) -1000kbit/sec  (8/1)

rate 30.000
• home network download rate:- 150kbyte/sec (20%)
             ( 1.2mbit/sec ) -1200kbit/sec  (8/1)

rate 35.000
• home network download rate:- 175kbyte/sec (20%)
             ( 1.4mbit/sec ) -1400kbit/sec  (8/1)

rate 40.000
• home network download rate:- 200kbyte/sec (20%)
             ( 1.6mbit/sec ) -1600kbit/sec  (8/1)

rate 50.000
• home network download rate:- 250kbyte/sec (20%)
               ( 2mbit/sec ) -2000kbit/sec  (8/1)

rate 75.000
• home network download rate:- 375kbyte/sec (20%)
               ( 3mbit/sec ) -3000kbit/sec  (8/1)

rate +75.000
• home network download rate:-+ 375kbyte/sec (20%)
              ( +3mbit/sec ) -+3000kbit/sec  (8/1)

•ex_interp

1 second = 1.000 millisecond (ms)
1.000/updaterate=interp
interp x 1 (ratio1)=ex_interp
interp x 2 (ratio2)=ex_interp (advised)
interp x 3 (ratio3)=ex_interp (advised)
interp x 4 (ratio4)=ex_interp

•Sample:
updaterate 50                 updaterate 75                   updaterate 100          
1.000/50=20                   1.000/75=13.3(3)              1.000/100=10            
20*1=ex_interp 0.020    13.3*1=ex_interp 0.014    10*1=ex_interp 0.010   
20*2=ex_interp 0.040    13.3*2=ex_interp 0.027    10*2=ex_interp 0.020   
20*3=ex_interp 0.060    13.3*3=ex_interp 0.040    10*3=ex_interp 0.030   
20*4=ex_interp 0.080    13.3*4=ex_interp 0.054    10*4=ex_interp 0.040   

•rate
maximum data transfer rate
•cl_updaterate
maximum amount of updates from server to you a second
•cl_cmdrate
maximum amount of updates from you to server a second
•ex_interp
The time span that your computer uses interpolation between the updates from the server. The more updates you get, the more real time connection you get, thus lowering the chances of your computer making the wrong prediction of a players position.