w91030b Winbond Electronics Corp America, w91030b Datasheet - Page 27

• Manufacturer Part Number: w91030b
• Description: Calling Line Identifier
• Manufacturer: Winbond Electronics Corp America

Notes:
1. In a CPE where AC power is not available, the designer may choose to switch over to line power when the CPE goes off-hook and
2. The FSKE pin may be set low to prevent the alert tone, speech or other FSK inband noise decoded by FSK demodulator and
3. The exchange will have already disabled the speech path to the distant customer in both transmission directions.
4. The FSKE should be set high as soon as the CPE has finished sending the acknowledge signal ACK.
5. The FSKE may be set low after the last byte (check sum) has been decoded or FCDN has become inactive.
6. In unsuccessful attempts where the exchange does not send the FSK signal, the CPE should disable FSKE, unmute the
use battery power while on-hook.
give false data when the dual tone alert signal is expected. If the FSKE pin can not controlled by microcontroller, the FSKE pin
must always placed in high state and the microcontroller must give up the FSK decoded data when the FSK signal is not
expected.
handset and enable the keypad after this interval.
Tip/Ring
SLEEP
INTN
ALGO
FSKE
FCDN
FDRN
DCLK
DATA
Figure 9-6. Input and Output Timing of BT Loop State (Off-hook) Data Transmission
Note 1
CPE goes off-hook
A = 40 50 mS
C =
E = 5 100 mS
G = Depends on data length
Start Point
Note 2
Note 3
t
REC
A
100 mS
Alert Signal
B
CPE mutes handset & disables keypad
C
t
ABS
CPE sends
ACK
D
- 27 -
Note 4
Note 6
E
B = 80 85 mS
D = 65 75 mS
F = 45 75 mS
H
Mark
F
100 mS
Preliminary W91030B
Message
Publication Release Date: March 2000
Data
G
...
...
CPE unmutes handset
and enables keypad
Note 5
H
Revision A1