5 ring detection services, Ring detection services, M1x22_set_min_inter_ring_gap – Maxim Integrated 73M1822/73M1922 Control Module User Manual
Page 46
73M1822/73M1922 Control Module User Guide
UG_1x22_053
46
Rev. 1.0
6.5 Ring Detection Services
The following services control how the modem manages Ring Detection.
Table 5: Ring Detection Services
Name
Description
Descriptor
Set minimum inter-ring timer value.
Channel
Set min frequency threshold for ring filter.
Channel
Set max frequency threshold for ring filter.
Channel
6.5.1 M1X22_SET_MIN_INTER_RING_GAP
Description
Upon detection of a RGDT interrupt the driver will start a timer with a minimum duration specified by this
IOCTL (default is 150 ms). If no more RGDT interrupts are detected in that time period, then the driver
will attempt to interpret the existing RGDT interrupts (polarity reversal or ring burst). Polarity reversals
and/or ring bursts separated by less than this time period will be considered to be one event and will be
interpreted as such. RGDT interrupts farther apart than this will be interpreted as separate events.
#define M1X22_SET_MIN_INTER_RING_GAP _IOWR(0xA4, 0xE2, unsigned int)
Prototype
int ioctl (
int chan_fd,
int M1X22_SET_MIN_INTER_RING_GAP,
unsigned long param );
Parameters
Data Type
Name
Description
int
chan_fd
Channel descriptor.
int
M1X22_SET_MIN_INTER_RING_GAP
I/O control identifier for this operation.
unsigned long
param
Time in ms.
Return Values
Data Type
Description
int
Always returns 0.