On 17 Mar, 2021, at 3:01 am, David Lang <david@lang.hm> wrote:
This is using the compute module, that does not have any on-board ports
Actually, the CM4 brings the on-board GigE interface out to the connector pins via a suitable PHY. All that is needed is a magjack on the carrier. What this particular carrier does is to provide a *twin* magjack, wire the appropriate CM4 pins to half of it, and wire the other half to a LAN7800 USB-to-GigE adapter. The latter is then wired up to the CM4 via a 4-port USB hub chip, so there are also three USB ports (one on a header, two as physical ports).
All but the cheapest of the CM4 models also include a single-channel, dual-band wifi/BT chip. This requires only an antenna to make it an austere but probably usable AP. For better performance, a multi-channel wifi adapter could be plugged into the USB header, and the cheapest CM4 "Lite" would probably then be sufficient.
- Jonathan Morton
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