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questions about rfc2892.


hi,everyone,
    recently I'm reading the rfc2892 and have some questions about it.
1> on page 31

	....
	if ((my_usage < allow_usage) &&
		!((lo_tb_depth > 0) && (fwd_rate < my_usage)) &&
		(my_usage < MAX_ALLOWANCE))
		// true means OK to send host packets
		my_usage_ok = true;
	...
    here I don't understand what "fwd_rate < my_usage" mean?

2> also on page 31

	...
	congested = (lo_tb_depth > TB_LO_THRESHOLD/2);
	...
   why must the TB_LO_THRESHOLD be divided by 2 ?

Thanks a lot!

Hongjie Chai