Question: what is the difference between long preamble and short preamble?
Answer: Long preamble is mostly used by legacy systems and has a sync of 128 bits where as short preamble has sync of 56 bits. SFD in both cases remains same at 16 bits. ... But support of short preamble is optional for 802.11b devices. Short preamble is enabled by default but disabled per SSID.