WLAN User Interface
IEEE 802.11 (a/b/g)
27
Operating Manual 1171.5283.12 ─ 18
Remote command:
n.a.
Execute Trigger
This feature is available for Trigger Source Internal only.
Executes trigger manually. A manual trigger can be executed only when an internal
trigger source and a trigger mode other than "Auto" have been selected.
Remote command:
[:SOURce<hw>]:BB:WLAN:TRIGger:EXECute
Clock
Calls the menu for selecting the clock source (see
Chapter 3.6, "Trigger/Marker/Clock
Remote command:
n.a.
3.2
PPDU/Sequence Configuration
In
framed mode
, a frame consists of a PPDU (PLCP protocol data unit) and the idle
time. The data packet on the physical layer is referred to as PPDU. A PPDU consists
of three components; the PLCP preamble, the PLCP header and the PSDU (PLCP ser-
vice data unit), which contains the actual information data (coming from higher layers).
The PLCP preamble and header are used for synchronization and signaling purposes,
and are themselves divided into fields.
The details of the PPDU structure depend on the selected standard or, more precisely,
on the physical layer mode (see below).
In
unframed mode
, the signal can be configured via the "PSDU bit rate" and "PSDU
modulation" parameters, as in the framed mode. However, a preamble or header is not
generated; only a continuous PSDU block is generated, the length of which can be var-
ied by using the "Sequence Length" parameter. There is no restriction of the maximum
PSDU block length to 4095
bytes as in the framed mode. Moreover, the data stream
can be scrambled before the modulation ("Scrambling Mode" parameter).
3.2.1
Standard 802.11a - OFDM
In the upper section of the menu, the parameters of the data part (PSDU) are set. In
the middle section, the parameters of the scrambler and interleaver are set. A graph in
the lower sections illustrates the structure of the PPDU (framed mode) or the unframed
sequence (unframed mode).
●
Framed mode:
PPDU/Sequence Configuration
