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On May 9, 2022, at 1:33 AM, Tomasz Moń <deso...@gmail.com> wrote:
> On Mon, May 9, 2022 at 9:21 AM Guy Harris <ghar...@sonic.net> wrote:
>> On May 8, 2022, at 11:09 PM, Tomasz Moń <deso...@gmail.com> wrote:
>>
>>> Device to device communication is not possible.
>>
>> Is the idea that the topology of USB is a tree, with the host at the root,
>> and only the leaf nodes (devices, right?) are end nodes?
>
> To some degree, yes. Note that the hubs are devices as well.
(So "communication is not possible" in "Device to device communication is not
possible." preferably refers not to sending USB link layer messages from device
to device, but refers to higher protocol layers; otherwise, you wouldn't be
able to plug a disk, network device, keyboard, mouse, etc. into a hub and have
it communicate with a host also plugged into the hub.)
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