delay_pool usage

hello ,
 
    i have these networks , specifically over
ethernet(masqueraded with the same proxy server) , serial-connected
networks ( leased lines).
    I'm planning to limit each network their bandwidth consumption to
33kbps but i want them to be able to use our main proxy provided they also
have their own proxy ( pointing to our main proxy as parent proxy)
based on my research, squid is capable of this with it's delay_pool
feature, so i compiled squid the the --enable-delay-pool as option in
configure.
below are the actual delay_pool entries in my squid.conf ... are those
entries correct ? coz i tried it already and network 'uc' can go over the
limit .. why is that ?
my other alternative in mind is to limit the serial with rate-limit since
i'm using cisco 3640 router but i want to try the squid delay_pool feature
and dont want to give anymore load to the router's CPU.

acl intranet src 10.10.10.0/255.255.255.192
acl uc src 202.58.117.160/255.255.255.248
acl qmile src 202.58.117.144/255.255.255.240
delay_pools 3
delay_class 1 1
delay_class 2 1
delay_class 3 1
delay_access 1 allow intranet
delay_access 1 deny all
delay_access 2 allow uc
delay_access 2 deny all
delay_access 3 allow qmile
delay_access 3 deny all
delay_parameters 1 4125/4125
delay_parameters 2 4125/4125
delay_parameters 3 4125/4125

please advise ... the above seem not to work ...

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