Protocol analysis
R&S
®
RTE
694User Manual 1326.1032.02 ─ 20
Polarity
Defines the polarity ("Normal" or "Inverted") of the data signal. This setting is only avail-
able in 10BASE-T.
Remote command:
BUS<m>:ETHernet:POLarity on page 1649
Thresholds
Sets the threshold value for the digitization of each signal line. If the signal value on the
line is higher than the upper threshold, the signal state is high. Otherwise, if the signal
value is below the lower threshold, the signal state is considered low.
"Thresholds"
Enter the values directly: upper threshold in the upper field, lower
threshold in the lower field.
"Full autoset"
Starts software algorithms for determining the signal threshold levels
and bitrate.
"Preset thresh-
olds"
Either sets individual voltages by selecting "Manual", or sets the vol-
tages to one out of four pre-defined levels:
●
10BASE-T (0 meters):
±
1.25
V
●
10BASE-T (100 meters):
±
750
mV
●
100BASE-TX (0 meters):
±
500
mV
●
100BASE-TX (100 meters):
±
350
mV
The "Preset" levels depend on:
●
The Ethernet variant
●
The distance from the transmitter. "0 meters" represents "voltage
at transmitter" and "100 meters" represents "voltage at the maxi-
mum cable length", according to the standard.
When any non-predefined threshold is set, the "Preset" value auto-
matically changes to manual (without affecting anything else).
"Auto thresh-
olds"
Executes the measurement of reference levels and sets the thresh-
olds to the middle reference level of the measured amplitude.
"Couple
thresholds"
Couples threshold settings between upper and lower threshold.
Remote command:
BUS<m>:ETHernet:THReshold:HIGH on page 1650
BUS<m>:ETHernet:THReshold:LOW on page 1650
BUS<m>:ETHernet:PRESet on page 1650
BUS<m>:SETReflevels on page 1421
BUS<m>:FAUToset on page 1421
Bit rate
Defines the transmission speed setting for the data signal:
●
10BASE-T: default bit rate 10 Mbps
●
100BASE-TX: default bit rate 125 Mbps
In both variants, the permitted bit rates range from 10 kbps to 150 Mbps. Switching the
variant adjusts the bit rate, independent of the previous setting.
Remote command:
BUS<m>:ETHernet:BITRate on page 1651
Ethernet 10BASE-T and 100BASE-TX (option R&S
RTE-K8)
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