Hi Alex?? you mean that maybe i need an ATM switch to creat the ring topology how can i implement it? can you give more detail info on it? Regards Li ????????????????????: >From:Alex Zeffertt <ajz at cambridgebroadband.com> >Reply-To: >To: <slowforce at zju.edu.cn> >Subject: Re: ATM issue: one Host Four Nodes > >On Thu, 5 Sep 2002, wrote: > > >In each NODE set up 1 terminated VC, and 3 switched VCs (using the >atm-860.o specific /proc/net/atm/switch interface). > >here's an example of how to set up a switched VC from 0.0.32 to 0.0.32 >using the atm-860.o driver: > >echo add 0.0.32 0.0.32 1000 cbr > /proc/net/atm/switch > > ^ ^ ^ ^ > from-VC to-VC PCR TT > >See http://mpc860sar.sourceforge.net for the source code. > >Alex > >BTW: If you're board only has one PHY then you need an ATM switch in the >middle to create the ring topology. If it's multi PHY then you will need >to modify the atm-860.o driver because it doesn't support this yet. (I >think that multi-PHY is only available on MPC862s anyway....) > >> >> Hi all, >> We just have such a system to build. >> ________ >> | | >> RX | ATM |_TX____________________________ >> |---------------------------->| HOST | | >> | | | | >> | |______| | >> | | >> | ________ ________ ________ ________ | >> | | | | | | | | | | >> | TX | ATM | RX TX| ATM | RX TX| ATM | RX TX| ATM | RX | >> |------| NODE |<------| NODE |<-------| NODE |<------| NODE |<------| >> | | | | | | | | >> |______| |______| |______| |______| >> A B C D >> It's used to perform high speed data acqusition. >> ATM HOST -- a pc with an ATM card >> ATM NODE -- MPC860 with linux-2.4.4 >> >> The ATM HOST is responisble for sending controlling information to ATM NODEs >> and receiving data from each NODEs. >> The ATM NODE is responsible for performing data acqusition. >> >> As the diagram show,ATM NODEs are connected one after another. >> we use one VPI/VCI to identify one ATM NODE, so if the ATM HOST send the >> control message to ATM NODE D, the message will touch ATM NODE A??B??C >> first, >> then ATM NODE D. In order to improve the system capacity and efficiency, >> the ATM NODE A??B??C should ignore this message(not parse it) and send it >> to the next node, in another words, this message should be bypassed in low >> level(e.g. PHY level) by ATM NODE A??B??C. How can i get this point? >> Any advice will be greatly appreciated! >> Best Regards! >> Li >> >> >> > >
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