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DM9801
1M Home Phoneline Network Physical Layer Single Chip Transceiver
44
Preliminary
Version: DM9801-DS-P02
March 20, 2000
DM9801 1M Framing
Figure 21
DM9801 Symbol Waveform
All DM9801 symbols are composed at the transmitter of a
silence interval and a pulse formed of an integer number
of cycles (CYCLES_PER_PULSE) of a frequency square
wave (CENTER_FREQUENCY) that has been filtered
with a bandpass filter. Data is encoded in the same time
interval from the preceding pulse.
The DM9801 pulse parameters are shown below.
Parameter
Value
Tolerance
Unit
CENTER_FREQUENCY
7.5
500 PPM
MHz
CYCLES_PER_PULSE
4
Cycle
DM9801 1M time intervals are expressed in Tine Interval
Clock (TIC) units. One TIC is defined as 7/(60E6) seconds
or approximately 116.67 nano-seconds (ns).
Access ID Intervals
The DM9801 1M frame begins with an Access ID interval
which is composed of eight equally spaced subintervals
termed AID symbols 0 through 7. (refer to figure 21 above)
An Access ID symbol is 129 TICs long. Transmit timing is
shown in figure 22 below. Timing starts at the beginning of
each AID symbol and ends at TIC = 129.
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