W91031 データシートの表示（PDF） - Winbond

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コンポーネント説明

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W91031

CALLING LINE IDENTIFIER

Winbond 

Preliminary W91031

CPE goes off-hook

CPE mutes handset & disables keypad

Start Point

CPE sends

Tip/Ring

Alert Signal

ACK

Mark

Note 1

A

B

Note 3

C

D

E

F

Note 6

SLEEP

CPE unmutes handset

and enables keypad

Message

G

H

INTN

...

t

REC

t

ABS

ALGO

FSKE

Note 2

Note 4

Note 5

FCDN

FDRN

...

DCLK

DATA

Data

Figure 9-6. Input and Output Timing of BT Loop State (Off-hook) Data Transmission

A = 40−50 mS

C = ≤ 100 mS

E = 5−100 mS

G = Depends on data length

B = 80−85 mS

D = 65−75 mS

F = 45−75 mS

H ≤ 100 mS

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 use battery power while on-hook.

2. The FSKE pin should be set low to enable the alert tone detector when the dual tone alert signal is expected.

3. The exchange will have already disabled the speech path to the distant customer in both transmission directions.

4. The FSKE may be set high as soon as the CPE has finished sending the acknowledge signal ACK.

5. FSKE should be set low when FCDN has become inactive.

6. In unsuccessful attempts where the exchange does not send the FSK signal, the CPE should disable FSKE, unmute the

handset and enable the keypad after this interval.

- 27 -

Publication Release Date: August 2000

Revision A1

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