stlc3040 STMicroelectronics, stlc3040 Datasheet - Page 28

• Manufacturer Part Number: stlc3040
• Description: Subscriber Line Interface Codec Filter, Cofislic
• Manufacturer: STMicroelectronics

STLC3040
bit (CR7 Register). The Hook state is anyway
sent upstream.
Returned Information on upstream GCI channel:
Figure 11: V
Through this procedure the ring functionality in-
cluding several effects, HV device, protect resis-
tor, battery voltage etc, can be evaluated.
6.1.10. TEST MODE D (TST-PTTX)
800Hz tone is sent to 2-wire. This pseudo TTX
signal (800Hz) requires C/I.5 bit (TIM) set to 0.
Shaping functions are disabled. The internal win-
dow detector is enabled as for Test Mode 7.
Measured line current gives information about
amplitude of generated pseudo TTX and conse-
28/49
Operating Mode:
B Filter:
Z Filter:
Rx Path:
Tx Path:
X, Gx:
KD:
DC Synthesis:
TTX:
Internal Tone
Generation in Rx:
Hook detection
I
High Pass Filters:
LIM
1.
2. CR2.4 (OKRNG)
3. CR2.7(XVA) = 1 means measurement has
Modulated if TMM = 1 in CR2 Register.
Connecting a known impedance across the line
and considering the programmed Ring level
(CR9 register), a window detector, as for Test
7, allows to monitor if the signal at PCM en-
coder input is in the correct range.
V RDC
:
settled.
OKRNG = 1 means that ring amplitude is
within the accepted range see fig. 11.
50
I
t
PAUSE
RING
R
larity.
6
DC
RDC
BURST
RING
Tx GAIN
sign depending on Battery Po-
THE WINDOWS DETECTOR
Ring
Off
Off
Off
Functional
Programmable
Programmable (Suggested
max value to avoid saturation
= 800h)
Off
Not applicable
Not applicable
As in Ring Mode
Off
Controlled by CR1.1 and
CR11.1
PEAKS "MEASURED" BY
RING AMPLITUDE
VRDC Sign depending
on Battery Polarity
D95TL207A
quently about the functionalities of TTX genera-
tion circuitry. 800Hz frequency is used instead of
standard 12KHz/16KHz, because 12KHz or
16KHz would be cut out by filters in Tx path.
Returned Information on TXB1 channel:
6.1.11. TEST MODE E (TST-TTXFILT)
Purpose of this test is to check the functionality of
the TTX filter.
A TTX signal at 12kHz or 16kHz superimposed to
a 1KHz tone, enabled by CR1.4, is sent to the
line.
Returned Information on upstream GCI channel:
OKTTX says that programmed TTX level has
been caught up.
OKTON set to 1 indicates that 1kHz tone has not
been compressed by the superimposed TTX sig-
nal. In this case the TTX filter properly works.
Operating Mode:
B filter:
Z filter:
Rx Path:
Tx Path:
R, X, GR, Gx:
KD:
DC Synthesis:
TTX:
Internal Tone
Generation in Rx:
Hook detection:
I
High Pass Filters:
Operating Mode:
B Filter:
Z Filter:
Tx Path:
Rx Path:
R, X, GR, GX
KD:
Lim
1.
2. CR2.5 (OKTTX)
3. CR2.6 (OKTON)
4. CR2.7(XVA) = 1 means measurement has
50
I
t
:
settled.
50
R
I
t
AC
R
AC
G
TX
Tx GAIN
Active
Programmable
Programmable
Functional
Functional
Programmable
Programmable (suggested
max value to avoid saturation
= 800h
Functional
800Hz with programmable
amplitude
1KHz Available
As in active
Functional
Controlled by CR1.1 and
CR11.1
Active
Programmable
Programmable
Functional
Functional
Programmable
Programmable (suggested
max value to avoid saturation
= 800h