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| Two channels, one transmission queue? |
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| mqdogsbody |
 Posted: Thu Nov 29, 2012 9:31 am Post subject: Two channels, one transmission queue? |
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Acolyte
Joined: 01 Jun 2010
Posts: 71
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In our wonderfully unpoliced environment someone has set up a new SDR channel that appears to use the same XMITQ as the "official" SDR channel.
I am curious as to what the effect of this will be. Is it OK, because each MCA will reliably pull off and transmit a batch of messages? Or will chaos ensure? What about sequence numbers, for instance?
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| mqjeff |
| Posted: Thu Nov 29, 2012 9:35 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| Only one channel will be able to start - the first one to try. |
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| exerk |
| Posted: Thu Nov 29, 2012 9:40 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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A SDR channel opens its XMITQ exclusively so whichever channel starts first will get lock on it. As to which channel starts will depend on whether the channel is set for triggering, and the TRIGDATA value of the XMITQ if triggering is set. Attempting to start the 'other' channel will result in failure of that channel (with appropriate error messages) and the effects of multiple-channel-single-xmitq on sequence numbers etc. I would expect to be the same as it would be if a channel is deleted/redefined - I haven't tested this so it's supposition on my part.
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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| fjb_saper |
| Posted: Thu Nov 29, 2012 8:31 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| exerk wrote: |
| A SDR channel opens its XMITQ exclusively so whichever channel starts first will get lock on it. As to which channel starts will depend on whether the channel is set for triggering, and the TRIGDATA value of the XMITQ if triggering is set. Attempting to start the 'other' channel will result in failure of that channel (with appropriate error messages) and the effects of multiple-channel-single-xmitq on sequence numbers etc. I would expect to be the same as it would be if a channel is deleted/redefined - I haven't tested this so it's supposition on my part. |
There is zero effect on sequence numbers. Each channel has it's own sequence numbers. The advantage of multiple channels one xmitq, is if you have multiple routes to the same destination. If each of those routes shares the same xmitq, only one can be up at a time. Howerver the destination should then always be available. (Shut down chl A, start chl B).
Have fun 
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| mqdogsbody |
| Posted: Fri Nov 30, 2012 3:51 am Post subject: |
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Acolyte
Joined: 01 Jun 2010
Posts: 71
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| fjb_saper wrote: |
| There is zero effect on sequence numbers. Each channel has it's own sequence numbers. |
That's good to know. So, it's not bad.
| fjb_saper wrote: |
| The advantage of multiple channels one xmitq, is if you have multiple routes to the same destination. |
... and may even be good.
| fjb_saper wrote: |
| Have fun |
I am going to try to get the bogus (as I see it) channel deleted. And also to try to appeal for a bit more policing. It's all very well for my boss to say it's not our job but when the brown stuff hits the rotary ventilation device the support algrothm is "call Dogsbody"!
Thanks all for the info.
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| exerk |
| Posted: Fri Nov 30, 2012 5:50 am Post subject: |
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Jedi Council
Joined: 02 Nov 2006
Posts: 6339
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| fjb_saper wrote: |
| exerk wrote: |
| A SDR channel opens its XMITQ exclusively so whichever channel starts first will get lock on it. As to which channel starts will depend on whether the channel is set for triggering, and the TRIGDATA value of the XMITQ if triggering is set. Attempting to start the 'other' channel will result in failure of that channel (with appropriate error messages) and the effects of multiple-channel-single-xmitq on sequence numbers etc. I would expect to be the same as it would be if a channel is deleted/redefined - I haven't tested this so it's supposition on my part. |
There is zero effect on sequence numbers. |
Thank you for the clarification.
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
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