Gino,
That seems to be the only configuration that meets the requirement.� The way I
see it, in a traditional FDD system you would license an XPIC pair of
frequencies, say 11075 H/V at point A and 11565 H/V at point B.� Assuming an
820 running 256QAM you might get 500mbps per
polarity per direction, for a two-way aggregate of 2gpbs.� You would have
licensed 160MHz at each end of the system, for a system efficiency of
2gbps/320MHz = 6 b/s/hz.
If you operate a B11 on the same pair of frequencies, you have to use
their FD mode which a typical PCN claims will deliver 736mbps.� It would seem
that this can be viewed as a two-way aggregate rate, because the radios still
take turns transmitting as in a true TDMA system.� So, the
system efficiency here is 736mbps/320MHz = 2.3 b/s/hz -- below the requirement
of 3 b/s/hz.
�
If you switch the B11 to the normal TDMA mode you will need to transmit
on the same frequency from each end of the link.� So, in addition to licensing
11075 H and V transmitting from point A, you also need to license 11075 H and V
transmitting from point B, which adds another 160MHz at each
end. The PCNs show this configuration giving 1.47gbps (again assumed to be an
aggregate figure due to the TDMA mode).� This is an efficiency of
1.47gbps/640MHz = 2.3 b/s/hz again.� However, because you have licensed two
frequency pairs, each site can also transmit and receive on the unused
11565 H and V frequencies.� If you do this then you get 2*1.47gbps/640MHz = 4.6
b/s/hz.� This seems to be the only valid configuration, but does this take two
radios at each end, or just one?
Mike Black
Black & Associates
727-773-9016
---------------------------- Original Message ----------------------------
Subject: Re: [AFMUG] B11
From: "Gino Villarini" <[email protected]>
Date: Wed, August 3, 2016 3:38 pm
To: "Animal Farm" <[email protected]>
--------------------------------------------------------------------------
> but the radio tx in both channels in the both polarites in both ends ...
>
> On Wed, Aug 3, 2016 at 1:31 PM, Eric Kuhnke <[email protected]> wrote:
>
>> No, it is just as spectrally efficient as any 256QAM radio... One 80 MHz
>> "low" channel in both polarities and one 80 MHz "high" channel in both
>> polarities, as a typical FDD band plan such as you would use with a
>> configuration with 2 dishes, 2 orthomode transducers and 4 radio heads
>> (each radio operating in a single polarity) in a 2+0 configuration.
>>
>> You're arriving at the figure of 320 MHz by counting everything twice.
>>
>> On Wed, Aug 3, 2016 at 10:28 AM, <[email protected]> wrote:
>>
>>> We haven't had the pleasure of coordinating a B11 link yet, but they
>>> certainly seem to be popular based upon the number of PCNs we are
>>> seeing. So, a dumb question hopefully based upon a simple misunderstanding
>>> of the numbers: I don't see how this meets the FCC minimum efficiency
>>> standards for wide channels at 11GHz:
>>>
>>> 80MHz channels x H and V = 160MHz, but with high/low pairing you double
>>> this? to 320MHz occupied per end? So, to meet the 3 b/s/hz requirement at
>>> 11GHz your symmetrical throughput would need to be >= 960mbps. What am I
>>> missing?
>>>
>>> Mike Black
>>>
>>> Black & Associates
>>>
>>> 727-773-9016
>>>
>>>
>>> ---------------------------- Original Message ----------------------------
>>> Subject: Re: [AFMUG] B11
>>>
From: "Jaime Fink" <[email protected]>
>>> Date: Tue, August 2, 2016 4:49 pm
>>> To: "SmarterBroadband" <[email protected]>
>>> "[email protected]" <[email protected]>
>>> --------------------------------------------------------------------------
>>>
>>> > The PHY is 1733 Mbps aggregate, so depending on the chosen window
>>> sizes, the top real world TCP speeds we’ve seen are between 1200-1300
>>> Mbps
>>> aggregate (75/25 or 50/50 mode), or 600-650 Mbps symmetric (50/50).
>>> >
>>> > For 11 GHz this assumes high/low pairing of 80 MHz and both
>>> polarizations coordinated.
>>> >
>>> > Jaime Fink • Mimosa<http://www.mimosa.co> • CPO & Co-Founder
>>> >
>>> >
>>> > On August 2, 2016 at 1:34:31 PM, SmarterBroadband (
>>> [email protected]<mailto:[email protected]>) wrote:
>>> > Can the B11 do 1Gbps Symmetrical?
>>> > If not what is best Symmetrical?
>>> > Thanks
>>> >
>>> >
>>> >
>>>
>>
>>
>
