Experimental Physics and
Industrial Control System

On 08/12/2016 03:48 PM, Zhang, Dehong wrote:
> Hi Expert Friends,
> 
> 
> Sorry to bother you again.
> 
> 
> Is it possible that the channel access server may send duplicates,
> or re-transmit the same messages?  Specially when congested?

A UDP message or TCP message?

For TCP, any duplication/retransmission due to network congestion should
be handled at the TCP layer, so should be hidden from CA (except for the
added time to receive).

For UDP, yes.  Duplicate packets can happen.

Replies:

Re: Is it possible for channel access to send duplicates? Kasemir, Kay

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Is it possible for channel access to send duplicates? Zhang, Dehong

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