What cpu is needed for an nstream link to get resonable throughput ?
I have a 700mhz PC is it worth trying to use nstream on this ?
It depends on your notion of reasonable. We’ve got quite a few nstreme (half-duplex) links running on 230 and 532 model router boards, quite slow processors compared to your candidate. They do very nicely for us in their roles, which involve maybe 12-15Mbps maximum traffic. Here’s the rundown on the 112 board, running a wee 175Mhz MIPS and turning in quite a respectable performance.
We are currently using RB532’s with multiple radios and cpu is too high when all radios are working at same time.
From my experience with RB112 for our use it is a bit slow, we are not a wisp and everyone expects to get the max speed out of their exquipment, currently people seem happy with about 1.2MB/sec transfers.
We are trying to get max performance on point to point links over 12km using 5.8GHz. Would you recomend nstream for this or just a normal link ?
Thanks
We’ve got a pretty fair sampling of 5.8 point to point links running anywhere from 20 to 50km using a mixture of 230 and 532 boards and bandwidths of 5-20Mhz. We find that polled Nstreme reduces the jitter in these connections to an insignificant level regardless of the typical traffic loads they support, with latency being on the order of 3-5ms in all conditions. We’ve found our best overall results generally employ exact fit w/maximum frame size. If the link quality will support it polled Nstreme is very nice if you’re neurotic about jitter, no doubt about it (in my mind, anway…).
That being said, a lot of folks here will tell you that for raw throughput in half duplex it’s better not to use nstreme. I guess it depends on the the objectives.
is there any redundacy built into NStream Dual? like if one of the 4 anteannas was to get blown away…does it fall to nstream single? or do we need to do this via scripts / watchdog?
joe
jo2jo,
No, there is no such option in Dual Nstreme.
dbostrom,
Thanks for the feedback, we shall have this link up and running shortly and I will try with and without nstream.
But depending on routing/bridging requirements of the network, I reckon some pretty smart scripts could be written to do this. Re-config the radios into single-radio Nstreme master/slave ignoring the second radio card. Possibly using “loss of connectivity” i.e. pings failing to decide to switch back to Nstreme. And possibly only assuming a manual reset back to Dual Nstreme, i.e. assume it’s a “disaster situation” and manual intervention or repair is required anyhow.
Comments from script gurus would be interesting …
Regards