non-HT long training field (802.11a/g) (L-LTF)
The Non-HT Long Training Field (L-LTF) is a training field in the frame of the Null Data Packet( NDP) announcement of 802.11a. Like the Non-HT Short Training Field( L-STF), it has a length of two bytes and a duration of 8 µs. The L-LTF data field has many characteristics of the L-STF field including the transmission criteria that are transmitted in sub-bands.