Pretty simple.
This is a 10/100/1000 RJ-45 switch.
It will sit as a TOR switch in each rack.
It has 48 RJ-45 10/100/1000 ports and 6 SFP+ 1/10G ports which can be used for uplinks.
The oversubscription is
48*1000 = 48000
6* 10000 = 60000
So as you can see there is NO oversubscription, so no bottle neck.
The two ports on the left are
Console and out of band management .
It always comes with 2 power supplies.
You can choose Port Side to power supply airflow
or
Power supply side to port side exhaust .
Part numbers are.
Rack mounts are
Support
Spare power