Ringing Injection; Table 7: Ringing Characteristics - Alcatel MTK-40131 Datasheet And User Manual

Ringing Injection

The SH POTS chipset is capable of
directly injecting a ringing signal of up
to 50Vrms (sine wave) without the need
for additional external components. The
technique of "balanced ringing" is
used, which allows this large voltage
swing to remain within the technology
limits of the SH LIC device. (Balanced
ringing requires a specific algorithm for
ring-trip detection, which is also imple-
mented by the chipset). The SH POTS
chipset allows the user to program a
DC offset during ringing as well as a
reduced amplitude ringing signal,
should the application require

Table 7: Ringing Characteristics

Parameter Conditions
Fr Ringing frequency
16.66, 20, 25 Hz
50 Hz
SFNr Single-frequency noise, 10 Hz to 4 kHz
Vr Ringing voltage (max), Vbatr=-72V
Dr Ringing distortion, sine mode
30Hz to 132 kHz
Trtd Ring-trip delay, load = 500Ω+4µF
Trtdeb Ring-trip de-bounce time
Trtzc Ring-trip detect zero-cross mask time
Tc Ring-cadence times (active and silent)
IrtH Ring-trip current, high threshold
IrtL Ring-trip current, low threshold
Hrt Ring-trip hysteresis
Notes:
1. Units are periods of the selected ring-
ing frequency. The default values are 1s
on, 3s off with a ringing frequency of
50Hz.
2. These are the default values, after
reset. The max and min ring-trip thresh-
olds can be individually programmed
this. Ringing waveform, frequency,
amplitude and cadence, as well as ring-
trip thresholds, are controlled by the
CODSP device, and are all program-
mable. Ringing cadence can be auto-
matic, with independently programma-
ble ring and pause times, or ringing
can be controlled directly via the GCI
bus. In automatic cadence mode, ring-
ing bursts on both channels can option-
ally be interleaved if simultaneously
active, to avoid peaks in current from
the ringing battery supply.
Min
-1
-2
50
0
1.75
1
6.0
3.5
2
in the range 0 to 63mA(!) nominal. The
ring-trip detect mask time is used to
bridge the zero-crossings of the ringing
signal, and is programmable between
0 and 32 ms in 125µs steps.
3. User-selectable 0 or 30ms. Default is
30 ms.
16
MTK-40131
Max Units
+1 Hz
+2 Hz
-63 dBm
Vrms
5 %
150 ms
30 ms
ms
255 n/n
12.0 mA
9.5 mA
mA
4. Ringing voltage is user programma-
ble from 0 to 70Vp(diff) between the a
and b wires (NB, the ringing battery
voltage must be large enough to encom-
pass this voltage), in 256 steps. The
default is the maximum value. Condi-
tion: Load = Ø mA
Note
4
3
2
1
2
2
2