The advantages of smaller PDUs(Protocol Data Units), are mentioned below:
1. The communications network may not be able to send/receive such size of block data. Like, ATM network allows blocks only of 53 octets, whereas Ethernet allows blocks of 1526 octets.
2. Error detection can be done quickly if the PDU is small and can be quickly re-transmitted if necessary.
3. The buffer of the receiver will not be busy for a continuous long time.
4. In shared systems, data can be sent to shared devices without delaying much.
5. There is CLOSURE, so the network can check situations and restart/recovery operations if needed.
