[Cerowrt-devel] Looking for MORE SQM Router Recommendations !

[Jonathan Morton]

> On 17 Mar, 2021, at 3:01 am, David Lang <david at 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