position of multiple bluetooth dongles
Hello everybody
Maybe someone knows this:
If two bluetooth dongles are used (a class1 and a class2), could it lead to signal interfereces/problems if they're just above each other and both have to send a lot of data at the same time?
With "right above each other", I mean this:
http://www1.ch2.conrad.com/m/7000_7999/7100/7160/7162/716282_LB_00_FB.EPS.jpg
(dongle cases are removed).
kind regards
Marco
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As there is a very few chance that the use the same frequency at the=20 same time and send the same data, I think (hope?) there is no problem :)
Marco Trudel a =E9crit :
Quoted 4 lines
Hello everybody
=20
Maybe someone knows this:
If two bluetooth dongles are used (a class1 and a class2), could it lea=
d=20
Quoted 5 lines
to signal interfereces/problems if they're just above each other and=20 both have to send a lot of data at the same time?
=20
With "right above each other", I mean this:
http://www1.ch2.conrad.com/m/7000_7999/7100/7160/7162/716282_LB_00_FB.E=
PS.jpg=20
Quoted 11 lines
=20
(dongle cases are removed).
=20
=20
kind regards
Marco
=20
=20
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Quoted 7 lines
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=20
--=20
Gabriel Guillon
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Marcel Holtmann
maintainerHi Gabriel,
Quoted 2 lines
As there is a very few chance that the use the same frequency at the same time and send the same data, I think (hope?) there is no problem :)
this might be one of 1600 per second. It is unlikely that the clock and the device address will be the same.
Regards
Marcel
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BT 1.1 dongles may interference...
BT 1.2 only when comunication with 1.1 devices - 1.2 devices can never=20 interference
Michal
Dne =E8t 10. =FAnora 2005 18:13 Marco Trudel napsal(a):
Quoted 4 lines
Hello everybody
Maybe someone knows this:
If two bluetooth dongles are used (a class1 and a class2), could it lead =
to
Quoted 1 line
signal interfereces/problems if they're just above each other and both ha=
ve
Quoted 4 lines
to send a lot of data at the same time?
With "right above each other", I mean this:
http://www1.ch2.conrad.com/m/7000_7999/7100/7160/7162/716282_LB_00_FB.EPS=
=2Ej
Quoted 7 lines
pg (dongle cases are removed).
kind regards
Marco
Quoted 9 lines
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=2D-=20
S pozdravem
Michal Semler
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Marcel Holtmann
maintainerHi Michal,
Quoted 3 lines
BT 1.1 dongles may interference...
BT 1.2 only when comunication with 1.1 devices - 1.2 devices can never interference
let me correct this. AFH is not for detecting used frequencies of other Bluetooth piconets. It only detects other wireless technologies, because for itself it is already protected by the hopping sequence itself. If it is the same hopping sequence it is the same piconet and thus it really wants to listen to its traffic.
Regards
Marcel
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Hello Marcel
so it's no problem? no mather of the bluetooth version of the dongle? no interference, respectively maybe a couple if thousands in a second? corrected by rfcomm? the distance of two dongles doesn't matter?
regards
Marco
Quoted 20 lines · Marcel Holtmann
Hi Michal,
Quoted 2 lines
BT 1.1 dongles may interference...
BT 1.2 only when comunication with 1.1 devices - 1.2 devices can never interferencelet me correct this. AFH is not for detecting used frequencies of other Bluetooth piconets. It only detects other wireless technologies, because for itself it is already protected by the hopping sequence itself. If it is the same hopping sequence it is the same piconet and thus it really wants to listen to its traffic.
Regards
Marcel
Quoted 11 lines
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Marcel Holtmann
maintainerHi Marco,
Quoted 2 lines
so it's no problem? no mather of the bluetooth version of the dongle? no interference, respectively maybe a couple if thousands in a second?
ask an expert on the baseband level.
Quoted 1 line
corrected by rfcomm?
The error correction is done at the chip level. The ACL link is reliable.
Quoted 1 line
the distance of two dongles doesn't matter?
If the distance is bigger, the chip must request more retransmission. You won't see that in any of the BlueZ layers.
Regards
Marcel
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Hello Michael
thank you a lot for this information.
Another question regarding this topic:
Does it help/make any difference if the two dongles have a distance of ~11cm? Does this lead to equivalent/less interferences?
I have no idea about how radios send out their signals. I could imagine that if they spread their signal and there's another dongle just above the sending one that sends out a signal too, the interference is much worse than if they have a little distance, because the point of the problem is not right at the source.
Will rfcomm ensure the correctness of received data? something like a checksum and automatic retransmission of data if a brocken packet is recognized?
regards
Marco Trudel
Quoted 34 lines · Michal Semler
BT 1.1 dongles may interference...
BT 1.2 only when comunication with 1.1 devices - 1.2 devices can never interferenceMichal
Dne čt 10. února 2005 18:13 Marco Trudel napsal(a):
Quoted 25 lines
Hello everybody
Maybe someone knows this:
If two bluetooth dongles are used (a class1 and a class2), could it lead to signal interfereces/problems if they're just above each other and both have to send a lot of data at the same time?With "right above each other", I mean this:
http://www1.ch2.conrad.com/m/7000_7999/7100/7160/7162/716282_LB_00_FB.EPS.j
pg (dongle cases are removed).kind regards
Marco-------------------------------------------------------
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Safe distance is about 1m. in 1.1 dongles for 10 meters...10 meters for 1.1= =20
for 100 meters.
M.
Dne po 14. =FAnora 2005 7:13 Marco Trudel napsal(a):
Quoted 13 lines
Hello Michael
thank you a lot for this information.
Another question regarding this topic:Does it help/make any difference if the two dongles have a distance of ~11cm? Does this lead to equivalent/less interferences?
I have no idea about how radios send out their signals. I could imagine that if they spread their signal and there's another dongle just above the sending one that sends out a signal too, the interference is much worse than if they have a little distance, because the point of the problem is not right at the source.
Quoted 24 lines
Will rfcomm ensure the correctness of received data? something like a checksum and automatic retransmission of data if a brocken packet is recognized?
regards
Marco TrudelQuoted 16 lines · Michal Semler
BT 1.1 dongles may interference...
BT 1.2 only when comunication with 1.1 devices - 1.2 devices can never interferenceMichal
Dne =E8t 10. =FAnora 2005 18:13 Marco Trudel napsal(a):
Quoted 9 lines
Hello everybody
Maybe someone knows this:
If two bluetooth dongles are used (a class1 and a class2), could it lead to signal interfereces/problems if they're just above each other and both have to send a lot of data at the same time?With "right above each other", I mean this:
http://www1.ch2.conrad.com/m/7000_7999/7100/7160/7162/716282_LB_00_FB.E=
PS
Quoted 17 lines
Quoted 7 lines
Quoted 7 lines
.j pg (dongle cases are removed).
kind regards
MarcoQuoted 9 lines
Quoted 9 lines
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Quoted 9 lines
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=2D-=20
S pozdravem
Michal Semler
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