Subject: [Capwap] 回复:Re: Proposed Resolution to :One issue, please discuss: I suggest some change for "11.9.18. IEEE 802.11 Tx Power"

From: zhaoyujin 31390 <[email-masked]>
Date: Fri, 06 Oct 2006 09:14:10 +0500

Hi Margaret & Dorothy:

  DBm can be used, but DBm units is not universal as mM. Because defferent device maybe defines different DBm level, CAPWAP is difficult to track this difference.

Regards
Michael

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----- 原邮件 -----
发件人: Dorothy Stanley <[email-masked]>
日期: 星期五, 十月 6日, 2006 上午3:14
主题: Re: [Capwap] Proposed Resolution to :One issue, please discuss: I suggest some change for "11.9.18. IEEE 802.11 Tx Power"

> Margaret,
> 
> dBm units could also be used. This message element, and the TX Power
> Level use mW, the TX Power Level to correspond with the 802.11 MIB
> definitions, which use mW units.
> 
> Dorothy
> 
> On 10/5/06, Margaret Wasserman <[email-masked]> wrote:
> >
> >
> > Hi All,
> >
> > This request is based on the assumption that the WTP's power level
> > will actually be set in dBm.  If that is true, why not use dBm (or
> > centi-dBm) as the unit for this attribute, instead of mW (or 0.1 
> mW)?>
> > Margaret
> >
> > On Oct 5, 2006, at 12:34 PM, Dorothy Stanley wrote:
> >
> > > All,
> > >
> > > The proposed resolution to the 11.9.18 comment is: Accept the
> > > commenters suggestion, change
> > >
> > >
> > >    From "Current Tx Power:  This attribute contains the transmit
> > > output power in mW."
> > >    to   "Current Tx Power:  This attribute contains the transmit
> > > output power in 0.1mW."
> > >
> > >
> > > Comments welcome,
> > >
> > > Thanks,
> > >
> > > Dorothy
> > >
> > > On 9/25/06, zhaoyujin 31390 <[email-masked]> wrote: Section
> > > 11.9.18 has following discripiton, I suggestion some change
> > >
> > >    From "Current Tx Power:  This attribute contains the transmit
> > > output power in mW."
> > >    to   "Current Tx Power:  This attribute contains the transmit
> > > output power in 0.1mW."
> > >
> > > The reason is: normally WLAN will use dbm. The conversion between
> > > dbm and mw can not satisfy this TLV requirement. If capwap
> > > transimit one mw value, the device can't precise get corresponding
> > > dbm.
> > >
> > >   For example
> > >          1 dbm<----->1.3mw  ----> 1mw
> > >          2 dbm<----->1.6mw  ----> 2mw
> > >          3 dbm<----->2.0mw  ----> 2mw
> > >
> > >   This time, if capwap transmits 2 mw, system doesn't know it is
> > > 2dbm or 3 dbm.
> > >
> > > The following is suggestion:
> > >   For example
> > >          1 dbm<----->1.3mw  ----> 13mw
> > >          2 dbm<-----> 1.6mw  ----> 16mw
> > >          3 dbm<----->2.0mw  ----> 20mw
> > >
> > > Thanks
> > > Michael
> > >
> > > >   The Tx power message element value is bi-directional.  When
> > > sent by
> > > >   the WTP, it contains the current power level of the radio in
> > > >   question.  When sent by the AC, it contains the power 
> level the
> > > WTP
> > > >   MUST adhere to.
> > > >
> > > >        0                   1                   2             
>      3
> > > >        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 
> 7 8
> > > 9 0 1
> > > >       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
> +-+-+-
> > > +-+-+
> > > >       |    Radio ID   |    Reserved   |        Current Tx
> > > Power       |
> > > >       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
> +-+-+-
> > > +-+-+
> > > >
> > > >   Type:  1041 for IEEE 802.11 Tx Power
> > > >
> > > >   Length:  4
> > > >
> > > >   Radio ID:  An 8-bit value representing the radio to configure.
> > > >
> > > >   Reserved:  MUST be set to zero
> > > >
> > > >   Current Tx Power:  This attribute contains the transmit output
> > > power
> > > >      in mW.
> > >
> > > This e-mail and attachments contain confidential information from
> > > HUAWEI, which is intended only for the person or entity whose
> > > address is listed above. Any use of the information contained
> > > herein in any way (including, but not limited to, total or partial
> > > disclosure, reproduction, or dissemination) by persons other than
> > > the intended recipient's) is prohibited. If you receive this e-
> mail> > in error, please notify the sender by phone or email
> > > immediately and delete it!
> > >
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