This chapter defines the data connectivity provided by the 5GS (Protocol Data Unit [PDU] Sessions, PDU Session continuity modes, traffic offloading, etc.).
Protocol data units (PDUs) -- packets exchanged between peer entities in the same layer. Service data units (SDUs) -- packets handed to a lower layer by an upper layer. A PDU is typically a SDU with an additional header or trailer that carries information needed by that layer's protocol.
The MAC layer supports the functions such as connecting the upper layer with the lower layer, transferring data and controlling radio resource. The MAC layer is composed of a HARQ entity, a multiplexing/de-multiplexing entity, a logical channel prioritization entity, and a control entity.
The 5G Session Management Function (SMF) is a fundamental element of the 5G Service-Based Architecture (SBA). The SMF is primarily responsible for interacting with the decoupled data plane, creating updating and removing Protocol Data Unit (PDU) sessions and managing session context with the User Plane Function (UPF).
Certified Associate in Project Management (CAPM)® certification holders are now required to earn professional development units (PDUs) to maintain their certification every three years.
Is this certification worth it? YES, according to statistics from the PMI itself, a certified PMP could experience a 20% paycheck increase. That is also my personal experience when I got certified. Other project managers have also admitted that the ROI you get after getting a PMP certification makes it worthwhile.
Do PDUs provide surge protection? Rack surge protectors distribute power from a single source to multiple devices but are not strictly PDUs. They are designed for use with equipment that needs to be guarded against voltage spikes and surges but does not require battery backup.
PDUs merely distribute power. They do not generate it. UPSs are essentially backup batteries in the server rack. They provide backup power in the event of an outage and complete protection against power quality problems.
To install the Rack PDU using the toolless mounting method, install it in the rear of the NetShelter® VX or SX Enclosure, in the cable channel directly behind the rear vertical mounting rails. To install the Rack PDU using the mounting brackets, install it on a vertical mounting rail on your rack or enclosure.
In general, UPS systems have surge suppression already and you can just use a PDU without surge suppression if you need additional outlets.