Problem to setting throughput value for SMSC group

hai,
 
 I am in a position to control the throughput level of particular SMSC
 connectivity. I found a way from kannel document suggests to use the
 variable "throughput". Even though i am setting that value as 5, but it
 delivering more than five to the SMSC. I tested this scenario with SMSC
 simulators and i found the simulator received nearly 11 requests. 
 
 Following is the smsc group configuration.
 
 #VINOD-SMSC
group = smsc
smsc-id = "VINOD-SMSC"
allowed-smsc-id = "VINOD-SMPP"
smsc = smpp
host = 192.0.200.00
port = 3333
smsc-username = "vinod"
smsc-password = "vinod"
system-type = "VMA"
address-range = ""
transceiver-mode = 1
interface-version = 34
source-addr-ton = 1
source-addr-npi = 1
dest-addr-ton = 1
dest-addr-npi = 1
keepalive = 25
log-level = 0
reroute-smsc-id="HUTCH-SMSC"
reroute = true
flow-control=0
window=1
throughput=1
log-file = "/home/log/kannel/vinod-smsc.log"