[ns] Error Model - I am confused!

[user <v43814@yahoo.com>]

Dear all,

I would like to use the 1st order Markov (2 states)
chain as an error model for wireless link in NS
2.1b7a.

In this NS version, I can find

ErrorModel/TwoState
ErrorModel/MultiState (by Jianping Pan)
and
ErrorModel/TwoStateMarkov


What are a differents between them?
The MultiState with spec. case when it has 2 states is
the same as the TwoState model?

In addition, for NS 2.1b4a version, the TwoState had
an error reported by Alhussein A. Abouzeid (you can
find it under "Contributed Code to ns-2" in the NS
homepage).

Having a look at the recent source code, only the
MultiState has been improved but not the TwoState!

Is it means the MultiState has overcome this error and
I can use it with 2 states?

And the last question:

What is the different between lossmodel and
link-lossmodel in terms of packet delay?

Thank you for your time.

Regards,
Vu

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