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Conference noted::atm

Title:atm
Moderator:NPSS::WATERS
Created:Mon Oct 05 1992
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:970
Total number of notes:3630

950.0. "improve BUS performance?" by TKOV51::HAYAKAWA (Kouhei Hayakawa, NPB/MS, Osaka HUB6F) Wed May 21 1997 23:54

I have a question about BUS performance.

Do you have a plan to improve BUS performance of GIGAswitch/ATM?

My customer needs more BUS performance. Because they are
developing a application which uses many multicast frames.
At present BUS performance of GIGAswitch/ATM is 5Mbps.
And BUS uses CBR service as point-to-multipoint VCC.
The bandwidth of the CBR service is 6Mbps. 
(I checked it from console of GIGAswitch/ATM.)
Why does BUS of GIGAswitch/ATM use CBR service?

Regards,
Kohei  

T.RTitleUserPersonal
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950.1NOTED::defctb.hpn.lkg.dec.com::melaragniBill, [email protected]Thu May 22 1997 09:5317
>>>Do you have a plan to improve BUS performance of GIGAswitch/ATM?

Yes, there is. Contact Ranjeet Sundan (NPSS::SUDAN, or [email protected]),
he should be able to give you some info.

>>>Why does BUS of GIGAswitch/ATM use CBR service?

This is the easiest way for the GS/ATM to create a point-to-multipoint link
within the confines of the switch. Our switch implements CBR service using a
schedule table (this table provides very deterministic service -- great for 
CBR traffic). This very same table is also very useful for setting up p-mp
connections because the switch can "schedule" the multiple destination points
and thus will have no contention.

hopes this helps,
bill
950.2Thanks!!!TKOV51::HAYAKAWAKouhei Hayakawa, NPB/MS, Osaka HUB6FThu May 22 1997 21:3324
Thank you for your quick reply.

>>>>Do you have a plan to improve BUS performance of GIGAswitch/ATM?
>
>Yes, there is. Contact Ranjeet Sundan (NPSS::SUDAN, or [email protected]),
>he should be able to give you some info.

	I will contact them.	

>>>>Why does BUS of GIGAswitch/ATM use CBR service?
>
>This is the easiest way for the GS/ATM to create a point-to-multipoint link
>within the confines of the switch. Our switch implements CBR service using a
>schedule table (this table provides very deterministic service -- great for 
>CBR traffic). This very same table is also very useful for setting up p-mp
>connections because the switch can "schedule" the multiple destination points
>and thus will have no contention.

	I can understand clearly. I think the reason is reasonable.
	Do you know that how do the competitors implement BUS of 
	LAN Emulation Server?

	Regards,
	Kohei
950.3NOTED::defctb.hpn.lkg.dec.com::melaragniBill, [email protected]Fri May 23 1997 08:506
Minor clarification: I misspelled Ranjeet's last name:

Ranjeet Sudan
NPSS::SUDAN

bill
950.4Fore and IBMLEMAN::CHEVAUXPatrick Chevaux @GEO, DTN 821-4150Fri May 23 1997 09:257
    .2�	Do you know that how do the competitors implement BUS of 
    .2�	LAN Emulation Server?
    
    I don't know for sure but I've attended presentations by FORE Systems
    (ForeRunner ASX-200 and -1000) and by IBM (8260) advocating the use of
    external LANE servers (Intel-based) for reasons of better performance.
                                     
950.5use external PCWASNT::"[email protected]"Born to be MildWed May 28 1997 11:254
My personal opinion is that high-speed LANE services run best on a 
external PC, one that is running Windows NT.

doug
950.6TKOV51::HAYAKAWAKouhei Hayakawa, NPB/MS, Osaka HUB6FFri May 30 1997 04:4610
>My personal opinion is that high-speed LANE services run best on a 
>external PC, one that is running Windows NT.

I think so. It is good idea.
I know that Interphase's ATM NIC product supports LANE services on
WindowsNT. But I cannot test it because that I don't have it. 
I hope that ATMworks will support LANE services. 

Kohei