HPE OfficeConnect 1920S...which software version is running on it? have you checked the Cat. 5E/Cat. 6 Ethernet cable used for uplinking your managed 1920S switch with the unmanaged Netgear (which one? is it Gigabit Ethernet?) switch? have you (Ethernet port related) power savings options enabled somewhere? how is configured your interface 48 with regard to port speed negotiaton and duplex mode?
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