From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <20061113200431.22314.qmail@web32907.mail.mud.yahoo.com> Date: Mon, 13 Nov 2006 14:04:30 -0600 (CST) From: Brown Dwarf To: BlueZ users MIME-Version: 1.0 Subject: Re: [Bluez-users] Multiple Bluetooth adapters question Reply-To: BlueZ users List-Id: BlueZ users List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1921870059==" Sender: bluez-users-bounces@lists.sourceforge.net Errors-To: bluez-users-bounces@lists.sourceforge.net --===============1921870059== Content-Type: multipart/alternative; boundary="0-446188856-1163448271=:21787" --0-446188856-1163448271=:21787 Content-Type: text/plain; charset=ascii Content-Transfer-Encoding: quoted-printable Hi Albert,=0A Thanks for the quick response. That definitly gives some i= nsight. =0AI am not too much worried about the data speed. But I do care ab= out the connection reliability. =0A=0A>> 100 is pushing it, but if not all = are transmitting, then it should be okay=0A I know 100 may be too much t= o ask, but what do you think would be a resonable number if all are transmi= tting ?=0AA related question is : what would be the behavior when too many = devices are around ? =0A=0ASomewhere I read that BT RF spectrum (2.4 to 2.= 485 GHz) is devivded in to 79 frequency hops.=0ACorrect me if I am wrong he= re : What I understand from this is that only 79 BT devices can be active i= n an area ?=0AWhich approximately gives 10 adapters and 69 client devices .= . does it make sense ??=0A=0A-B=0A=0A=0A=0A----- Original Message ----=0AFr= om: Albert Huang =0ATo: BlueZ users =0ASent: Monday, November 13, 2006 11:33:52 AM=0ASubject:= Re: [Bluez-users] Multiple Bluetooth adapters question=0A=0A=0AYou should = experience "graceful" degradation of performance, as you=0Aincrease the num= ber of colocated transmitting devices. 100 is pushing=0Ait, but if not all= are transmitting, then it should be okay.=0A=0A-albert=0A=0AOn 11/13/06, B= rown Dwarf wrote:=0A>=0A> Hi all,=0A> This may b= e a FAQ, but I could not locate an definit answer.=0A>=0A> I want to what a= re all the implications of having multiple bluetooth=0A> adapters on a mach= ine.=0A> As you might have guessed, I would like to host more than 7 (say 1= 00 ) BT=0A> connections (SPP) at a time. I noticed BlueZ supports upto 16 a= dapters -=0A> which means it can support upto 112 connections at a time ??= =0A>=0A> Anybody ever tried it ?=0A>=0A> In other words, if I have 16 adapt= ers installed on a box and have 100 client=0A> BT devices around, can they = all communicate to one of those 16 adapters at=0A> any time ? I don't know = much about the RF side of the problem, but I am=0A> little concerned about = the fact that BT band-width is small. So can all=0A> those devices resonabi= ly share the narrow frequency space ?=0A>=0A> Any comments or pointers to a= ny tech infomation / articles / resources will=0A> be greatly appreciated.= =0A>=0A> thanks in advance.=0A> -B=0A>=0A> --------------------------------= -----------------------------------------=0A> Using Tomcat but need to do m= ore? Need to support web services, security?=0A> Get stuff done quickly wit= h pre-integrated technology to make your job=0A> easier=0A> Download IBM We= bSphere Application Server v.1.0.1 based on Apache Geronimo=0A> http://sel.= as-us.falkag.net/sel?cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=3D121642=0A>= =0A> _______________________________________________=0A> Bluez-users mailin= g list=0A> Bluez-users@lists.sourceforge.net=0A> https://lists.sourceforge.= net/lists/listinfo/bluez-users=0A>=0A>=0A>=0A=0A---------------------------= ----------------------------------------------=0AUsing Tomcat but need to d= o more? Need to support web services, security?=0AGet stuff done quickly wi= th pre-integrated technology to make your job easier=0ADownload IBM WebSphe= re Application Server v.1.0.1 based on Apache Geronimo=0Ahttp://sel.as-us.f= alkag.net/sel?cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=3D121642=0A__________= _____________________________________=0ABluez-users mailing list=0ABluez-us= ers@lists.sourceforge.net=0Ahttps://lists.sourceforge.net/lists/listinfo/bl= uez-users=0A=0A --0-446188856-1163448271=:21787 Content-Type: text/html; charset=ascii Content-Transfer-Encoding: quoted-printable
Hi Albert,
=0A
    T= hanks for the quick response. That definitly gives some insight.
=0A<= DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times= , serif">I am not too much worried about the data speed. But I do care abou= t the connection reliability.
=0A
 
=0A
= >> 100 is pushing it, but if not all are transmitting, then it should= be okay
=0A
    I know 100 may be t= oo much to ask, but what do you think would be a resonable number if all ar= e transmitting ?
=0A
A related question is : what would = be the behavior when too many devices are around ?
=0A
=  
=0A
Somewhere I read  that BT RF spectrum (2.4 to= 2.485 GHz) is devivded in to 79 frequency hops.
=0A
Correct = me if I am wrong here : What I understand from this is that only 79 BT devi= ces can be active in an area ?
=0A
Which approximately gives = 10 adapters and 69 client devices .. does it make sense ??
=0A
-B
=0A


 
=0A----- Original Message ----
From: Albert Huang <albert@csail.mi= t.edu>
To: BlueZ users <bluez-users@lists.sourceforge.net>
S= ent: Monday, November 13, 2006 11:33:52 AM
Subject: Re: [Bluez-users] Mu= ltiple Bluetooth adapters question

=0A
You should experience "gr= aceful" degradation of performance, as you
increase the number of coloca= ted transmitting devices.  100 is pushing
it, but if not all a= re transmitting, then it should be okay.

-albert

On 11/13/06,= Brown Dwarf <brown_drf@yahoo.com> wrote:
>
> Hi all,
= >      This may be a FAQ, but I could not = locate an definit answer.
>
> I want to what are all the implic= ations of having multiple bluetooth
> adapters on a machine.
> = As you might have guessed, I would like to host more than 7 (say 100 ) BT> connections (SPP) at a time. I noticed BlueZ supports upto 16 adapte= rs -
> which means it can support upto 112 connections at a time ??>
> Anybody ever tried it ?
>
> In other words, if I= have 16 adapters installed on a box and have 100 client
> BT devices= around, can they all communicate to one of those 16 adapters at
> any time ? I don't know much about the RF side of the = problem, but I am
> little concerned about the fact that BT band-widt= h is small. So can all
> those devices resonabily share the narrow fr= equency space ?
>
> Any comments or pointers to any tech infoma= tion / articles / resources will
> be greatly appreciated.
>> thanks in advance.
> -B
>
> -----------------------= --------------------------------------------------
> Using Tomcat but= need to do more? Need to support web services, security?
> Get stuff= done quickly with pre-integrated technology to make your job
> easie= r
> Download IBM WebSphere Application Server v.1.0.1 based on Apache= Geronimo
> http://sel.= as-us.falkag.net/sel?cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=3D= 121642
>
> _______________________________________________
> Bluez-users mailin= g list
> Bluez-users@lists.sourceforge.net
> https://= lists.sourceforge.net/lists/listinfo/bluez-users
>
>
>= ;

------------------------------------------------------------------= -------
Using Tomcat but need to do more? Need to support web services, = security?
Get stuff done quickly with pre-integrated technology to make = your job easier
Download IBM WebSphere Application Server v.1.0.1 based = on Apache Geronimo
http://= sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D120709&bid=3D263057&da= t=3D121642
_______________________________________________
Bluez-= users mailing list
Bluez-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-users
=0A


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