Bridge - maximum bandwidth =- short distance

RouterOS General
1

Forgive me if I’m in the wrong place but today is my first day looking at MikroTik.
Background - 1000 hosts on a 100Mb VLAN’ed network with multiple WAN links. We’re moving shortly to a building 100 metres away (currently a big hole in the ground). We will lay fibre to the new building and move equipment item by item as we are a 24/7 operation. I need a wireless backup solution for the day they cut through the fibre. What should I be looking at. I’m in the U.K.

2

Hi there,

Have you considered a laser link?
Will give you the 100Mbps or 1000Mbps dedicated throughput.
(to avoid ‘flames’ from a shameless commercial pitch on laser links on MT’s forum, contact me offline - also in the UK - stephen.patrick@cablefree.co.uk)

Otherwise an RF link, that would be 24Mbps half-duplex from a standard commercial product, or 44Mbps with all the latest MT stack loaded on.
RF links can go an awful lot further distance than laser links.

Stephen

3

with latest 2.8.16 (on 2 ghz celeron platform) we got over 50 mbit/s throughput half-duplex or 25 mbit/s full-duplex with 802.11a-turbo and (single-) nstreme on a 1.5 km link.

has to be proven by further testing, but it seems the right direction…

4

44Mb/s wouldn’t be enough so details of your products have been salted away until there is less of a hole, the cranes are up and I’ve a better idea of line of site.

Thanks.

5

Wow that is really impressive!

We are about to do tests using 1GHz VIA EPIAs, 802.11a.
Do you think our CPUs are fast enough?

  • What CPU usage did you get on 2GHz celerons?
  • What radio cards did you use?


    Stephen
6

i haven’t tried 1ghz CPUs. with 300 mhz throughput is about 10 mbit/s at 100 percent CPU load.

the 2 ghz CPUS had 20 to 50 percent load

Atheros AR5212 (PCI)

7

I’ve got two routerboards using the 100mW Atheros a/b card over a 17.8 mi. link, and am getting 10Mbps at 5.8, on 5805MHz using two 32dB PacWireless dishes. I find that Nstreme or encryption, or 5GHz-turbo just slows things down. I also find that playing with the power levels just degrades performance. The ACK setting is also on automatic.

8

what’s the signal strength that you see?