W91031 データシートの表示（PDF） - Winbond

部品番号

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

Tip/Ring

CAS

CPE sends

ACK

Mark

Note 1

SLEEP

A

B

C

D

E

Note 5

INTN

tREC

tABS

ALGO

CPE unmutes handset

and enables keypad

Message

F

G

...

FSKE

FCDN

Note 2

Note 3

Note 4

FDRN

DCLK

DATA

...

Data

Figure 9-4. Input and Output Timing of Bellcore Off-hook Data Transmission

A = 75−85 mS

C = 55−65 mS

E = 58−75 mS

G ≤ 50 mS

B = 0−100 mS

D = 0−500 mS

F = Depends on data length

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. The CPE has

the capability to disable the CAS detection by setting FSKE always high during the on-hook state.

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

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

5. For unsuccessful attempts where the end office does not send the FSK signal, the CPE should disable FSKE, unmute the

handset and enable the keypad after this interval has elapsed.

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Publication Release Date: August 2000

Revision A1

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