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Re: [Discuss-gnuradio] bulk or isochron communication with the usrp

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] bulk or isochron communication with the usrp
Date: Sun, 19 Mar 2006 11:54:21 -0800
User-agent: Mutt/1.5.9i

On Sun, Mar 19, 2006 at 01:01:51PM +0100, Stein Erik Ellevseth wrote:
> hi
> I am wondering why bulk communication is used instead of isochronous
> between the usrp and the host.
> isochron communication secure the timing of the received samples but do
> not garantee errorfree information as with bulk (and interrupt)
> communication.
> Isochron communication is (as far as I have understood) also usually used
> in communication with audio and video devices.
> regards
> stein erik ellevseth

(1) iso wasn't well supported by GNU/Linux when we started. (I'm not
    sure of the current status.)
(2) With bulk we get error correction across the USB.
(3) Net throughput is about the same for the two cases.
(4) Bulk seems to be working fine, so we haven't revisited the
    original decision.


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