Cisco Catalyst 9400 Series Installation Note page 18

Support and Restrictions
7
The number of ports available on a single switch
18
• Can be installed in any non-supervisor module slot.
• Ensure that the chassis power supply configuration supports the PoE budget adequately. Use
the Cisco Power Calculator
requirements for a specific PoE configuration.
• Some legacy Cisco powered devices (like 7910, 7940, 7960 IP phones and AP350 wireless
access points) are incompatible with Type 4 Power Supply Equipments (PSEs), as defined
in the IEEE 802.3bt standard. If connected, the PSE reports a 'Tstart' or 'Imax' fault with
each periodic attempt at providing power to the powered device. For continued use of these
legacy Cisco powered devices, connect them to Cisco PoE+/UPOE PSEs.
• C9400-LC-48H module is supported only on Cisco IOS XE Release 16.12.1 and later releases.
Before inserting the module, ensure that the device software is Cisco IOS XE Release 16.12.1
or a later release.
Before downgrading the software on the device from Cisco IOS XE 16.12.1 to earlier releases,
ensure that you remove the C9400-LC-48H module.
for power budgeting estimates and to determine power supply