AC equipment and spectral scan problem

RouterOS Wireless Networking
1

Hi all,

I am testing the new AC RB921UAGS-5SHPacD and found this:

  MMM      MMM       KKK                          TTTTTTTTTTT      KKK
  MMMM    MMMM       KKK                          TTTTTTTTTTT      KKK
  MMM MMMM MMM  III  KKK  KKK  RRRRRR     OOOOOO      TTT     III  KKK  KKK
  MMM  MM  MMM  III  KKKKK     RRR  RRR  OOO  OOO     TTT     III  KKKKK
  MMM      MMM  III  KKK KKK   RRRRRR    OOO  OOO     TTT     III  KKK KKK
  MMM      MMM  III  KKK  KKK  RRR  RRR   OOOOOO      TTT     III  KKK  KKK

  MikroTik RouterOS 6.15 (c) 1999-2014       http://www.mikrotik.com/

[?]             Gives the list of available commands
command [?]     Gives help on the command and list of arguments

[Tab]           Completes the command/word. If the input is ambiguous,
                a second [Tab] gives possible options

/               Move up to base level
..              Move up one level
/command        Use command at the base level
[admin@MikroTik] > interface wireless spectral-scan range=5200-5300 duration=10 
number=0
failure: this device can not do spectral scan

Of course I’m meaning this error message:
failure: this device can not do spectral scan

Is this a software bug or does this chipset doesn’t support this feature?

Thanks in advance,

When we can expect full functionality of AC products?
When we can expect full functionality of AC products?
RB911G-5HPacD-NB = no spectral scan?
2

:open_mouth:
this is a big problem,
is this true? spectral-scan does not work on ac equipment ?

3

hmm, was it not so that you fist have to print the wireless interfaces?

\intererface wireless pr

and than choose ‘0’ for the spectral scan.

I am not 100% sure but you can at least try this?

4 
  MMM      MMM       KKK                          TTTTTTTTTTT      KKK
  MMMM    MMMM       KKK                          TTTTTTTTTTT      KKK
  MMM MMMM MMM  III  KKK  KKK  RRRRRR     OOOOOO      TTT     III  KKK  KKK
  MMM  MM  MMM  III  KKKKK     RRR  RRR  OOO  OOO     TTT     III  KKKKK
  MMM      MMM  III  KKK KKK   RRRRRR    OOO  OOO     TTT     III  KKK KKK
  MMM      MMM  III  KKK  KKK  RRR  RRR   OOOOOO      TTT     III  KKK  KKK

  MikroTik RouterOS 6.19 (c) 1999-2014       http://www.mikrotik.com/

[?]             Gives the list of available commands
command [?]     Gives help on the command and list of arguments

[Tab]           Completes the command/word. If the input is ambiguous,
                a second [Tab] gives possible options

/               Move up to base level
..              Move up one level
/command        Use command at the base level
[master@MikroTik] > interface wireless 
[master@MikroTik] /interface wireless> print
Flags: X - disabled, R - running 
 0    name="wlan1" mtu=1500 mac-address=XX:XX:XX:XX:XX arp=enabled interface-type=Atheros AR9888 mode=ap-bridge ssid="XX" frequency=auto 
      band=5ghz-a/n/ac channel-width=20mhz scan-list=5100-5500 wireless-protocol=nv2 vlan-mode=no-tag vlan-id=1 wds-mode=disabled wds-default-bridge=none 
      wds-ignore-ssid=no bridge-mode=enabled default-authentication=no default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0 hide-ssid=no 
      security-profile=default compression=no 
[master@MikroTik] /interface wireless> spectral-scan 0 range=5ghz
failure: this device can not do spectral scan
[master@MikroTik] /interface wireless>

Hi, seems that no support spectral-scan

5

OK, that’s no good then. Report it to MT.
Does the normal scan also not work? (I can’t test it, don’t have ac stuff yet…)

6

if I try a freq usage from winbox, my SXT reboots everytime (running 6.20rc10)

7

My RB SXT G-5HPacD ROS v6.19 reboots every time i try to use freq usage too.

8

Same problem with my 911G-5HPacD (aka Netbox5) link. Both devices reboots during freq. usage. Firmware is 3.17 and OS 6.19.
Also “Current tx power” is reporting all zeroes for everything!

In “Registration” under “signal” it only measures classic 6-54mbit rate signals. There are no signal for advanced rates!

9

My all RB SXT ac ROS v6.20rc15 FW3.18.1 same problem - reboots during Freq. Usage, snooper :frowning: the problem is not with you?

10

Though this was supposed to be repaired.. tried it with 6.21.1 and it’s still not working. This really needs to work if the hardware is to be viable

11

I guess only the kernel failures have been fixed with 6.21, no news for spectral scan though..

What's new in 6.21 (2014-Oct-30 12:34):
*) wireless - fixed scanning tool crash for 802.11ac interfaces
*) wireless - fixed Nv2 kernel panic on 802.11ac interfaces
12

Use it all the time… how are we supposed to figure out where to set our channels???

13

These features are simply not supported by the AC wireless chips, software can’t be fixed as the hardware lacks this ability.
Above mentioned Changelog entries apply to Snooper and Scan

14

Hmm, thats not good news :frowning: But as far as I know the well known competitor is saying their AC will have the spectral scan feature so its a bit surprise to me that its not supported by the chipset. Howcome atheros could develop a chipset without this…

15

I will investigate this and will post more details later today

16

Thanks very much Normis :slight_smile:

17

on sxt ac, 6.21.1, fw 3.17, for me scanning and frequency usage works well 4900-6100 just set only-n in wireless band, did not test over AC.
on ac set power to manual, all rates fixed power. does the job. makes it stable witch nv2 for me, link on 500 meters high noise.

18

It looks like we can implement Spectral Scan, but it will take some time. It is on our to-do list

19

Thats great news, thanks very much Normis :slight_smile:

20

Will you also include the TX POWER feature available again for AC?

We also found NV2 to be less stable than the other protocol with Atheros AC ships, up and down a lot.