I have some queries related to Nexus .

I have some queries regarding Nexus Architecture.
1) We have MSFC and PFC for layer 3 & layer 2 communication in 6500 .
How layer 2 & 3 traffic is been handled in Nexus. Do they have a specific asics. What are those asics ?
2) We have three types of line cards in 6500. Classic /fabric enables/fabric only.
Are all line cards in Nexuas are facbric only. What is the Asic which we use for distributed forwarding in line cards in Nexus as we use DFC in 6500.
Fabric modules in line cards are used for providing wire speed or it has other benefits as well. can i say it is just a kind of constellation bus which we had in 6500.
3) Are there and D bus/R Bus / EOBC on Nexus.
I believ D- bus wont be there as it use fabric. What about the results. Does it use the same LTL index logic to calculate result. I believe it should as it is from same family as it is known as EARL 8.
How does it handle control plane traffic / data and result .
Lets say I have a machine A connected to Module 2 port 1 ( M1 card) and machine B connected to module 3 port 1 on same chassis(7018) .
What will be the whole process which it will follow. Let say layer 2 traffic will be handles by Superman and layer 3 will be handles by Tycho.
if any one can explain me the whole packet flow that would be great.
4) What is the role of Supervisor in Nexus. It has central Arbitar Asic which id some thing diffrent then 6500. VOQ is also handled here. Can we say if we use central Arbitar Asic on line cards ...They will start working as supervisor some what .
Any comments will be appreciated.
Thanks
Namish
3)

1- Nexus used distributed architecture and all the line cards support L3 except the F1 which you need to mix it with M series to get L3 functionality
2- nexus has diffrnet architecure form 65K however new line cards can provide you line speed 10G per port such as F2
3- Nexus uses fabric modules with full mesh channels between these modules and each line card ( provide you much more capacity than 65K for sure )
for packet flow you can find it on cisco.com because it long a bit however in brief:
- Unicast Forwarding Distribution Manager (UFDM) interfaces
between URIBs on supervisor and IP FIB on
I/O modules
- IP FIB process programs forwarding engine hardware on I/Omodules
4- the Unicast Forwarding Distribution Manager and L2 forwarding manager are examples of what is hosted in the SUP
hope this help

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I want to check all functions of PCI 6534.I have read the user manual..I have some memory related questions.Please help me for that.

I want to check all functions of PCI 6534.I have read the user manual..I have some memory related questions.Please help me for that.
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Hi Vishal,
I'll try to answer your questions as best I can.
1) It is definitely possible to preload data to the 32MB memory (per group) and start the acquisition after you have preloaded the memory. There are example programs on ni.com/support under Example Code for pattern generation and the 6534 that demonstrate which functions to use for this. Also, if your PC memory buffer is less than 32MB, it will automatically be loaded to the card. If you are in continuous mode however, you can choose to loop using the on-board memory or you can constantly be reading the PC memory buffer as you update it with your application environment.
2) Yes, your data will automatically be loaded into the card's onboard memory. It will however be transferred as quickly as possible to the DMA FIFO on the card and then transferred to the PC memory buffer through DMA. It is not going to wait until the whole onboard memory is filled before it transfers. It will transfer throughout the acquisition process.
3) Vishal, searching the example programs will give you many of the details of programming this type of application. I don't know you application software so I can't give you the exact functions but it is easiest to look at the examples on the net (or the shipping examples with your software). Now if you are acquiring 512 bytes of data, you will start to fill your onboard memory and at the same time, data will be sent to the DMA FIFO. When the FIFO is ready to send data to the PC memory buffer, it will (the exact algorithm is dependent on many things regarding how large the DMA packet is etc.).
4) If I understand you correctly, you want to know if you waste the other 6 bits if you only need to acquire on 10 lines. The answer to this is Yes. Although you are only acquiring 10 bits, it is acquired as a complete word (16bits) and packed and sent using DMA. You application software (NI-DAQ driver) will filter out the last 6 bits of non-data.
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Mac_fool wrote:
Thanks for your reply!
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Edited by: Pallavi Kakoti on Feb 2, 2012 8:19 AM

Hi
1.Which equipment category do we choose, Q or P?
Ans:
Q is normaly used for Instruments,Lab equipments
P also used for Production/process related equipments needs calibrations often
2.While creating a maintenance plan,which category do we choose, maintenance order or quality maintenance order?
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we can not used maintenance order if it is not linked to inspection type 14.
3.Is it that we can't do a time confirmation before results recording?If I try to do so,I get this message"No open operation recieving confirmation entries for order".
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Hi
1.Which equipment category do we choose, Q or P?
Ans:
Q is normaly used for Instruments,Lab equipments
P also used for Production/process related equipments needs calibrations often
2.While creating a maintenance plan,which category do we choose, maintenance order or quality maintenance order?
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Its all depends on config you have did. if Quality maintenance order should be linked to inspection type.can be used.
we can not used maintenance order if it is not linked to inspection type 14.
3.Is it that we can't do a time confirmation before results recording?If I try to do so,I get this message"No open operation recieving confirmation entries for order".
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You can do time confirmation after result recording, then UD.after UD ,order will be TECOed automaticlay.
4.While I create my maintenance plan,I get this message, a counter could not be defined for the reference object.Why so?
Ans:
Check any measuring counters created for the equipments,
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After UD, system changes the status NPRT for the equipments have PRT view only.
if PRT view maintained in the equipment, system status remains AVLB.
If you dont to use the equipment after UD-Reject,have to go development using user status.
6.Can I create my calibration order manually and assign equipment task list.If so,how?
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Yes. you can
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<a href="/people/michal.krawczyk2/blog/2005/06/28/xipi-faq-frequently-asked-questions"><b>XI / PI FAQ - Frequently Asked Questions</b></a>

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