This attribute counts the total number of cells containing modem
data received from the interface while the channel was seized. A
CCS channel is always considered to be seized. Cells are considered
to be modem data if a constant energy level above -25 dBmO
is detected for more than 900 ms. An energy level below -36 dBmO
for more than 650 ms is required to detect that the modem is no
longer present.
A cell contains 44 bytes of data from the DS0 channel (5.5 ms).
This flow is measured before compression is performed on the
channel.
This counter wraps to zero after reaching its maximum value.