On conducted topologies, here are two common ones where ln are variable
attenuator legs.  The asterisk is a butler matrix or splitter/combiner in
the relative center.

A       B
  \     /
l1\   / l2
    \ /
     *
    / \
l3/   \l4
  /     \
C      D

Then the power levels are controlled by variable attenuator legs, giving 4
degrees of freedom.

A       B
  \     /
l1\   / l2
    \ /
     *
     | l5
     *
    / \
l3/   \l4
  /     \
C      D

This immediate above collapses to the star when l5 = 0.  Otherwise l5
separates two BSSIDs as an example.

The matrices are simple, eg. for the star:

1 1 0 0
1 0 1 0
0 0 1 1
0 1 0 1

Bob

On Tue, Nov 7, 2017 at 2:21 AM, Pete Heist <peteheist@gmail.com> wrote:

> I ordered 2x APU2: http://pcengines.ch/apu2c4.htm
>
> With 16GB mSATA SSDs, PSUs, cases and the serial cable I needed, the total
> came to 9097 CZK / 356 EUR / 412 USD.
>
> Happily, the igb Ethernet driver for its i210 NICs does support BQL and
> appears to have hardware timestamping to boot. With three Ethernet ports,
> I’ll get one for management, one for testing and one for PTP time sync
> straight to the other APU.
>
> I’m expecting the CPU PassMark (for what that’s worth) to be around 1100,
> 353 single core. That’s significantly less than other devices I was looking
> at, but at least it’s a quad core, and at this price it’s worth a try.
> Since Jon reported his E-450 (PassMark 769, 431 single core) was capable of
> line-rate GigE, hopefully this will be as well.
>
> When they come I’ll run some benchmarks and report back how it goes…
>
>
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