AS2574B datasheet(8/24 Pages) AMSCO

8 / 24 page

Data Sheet

AS2574B

Rev. 1

Jan. 1995

DiodeOptions

SystemConsiderations

The device is intended to be used in telephone instru-

ments, that are permanently on-line, i.e. also when on-

hook the circuit is connected to the telephone line, but in

standby mode (idle) and hence only drawing a small

leakage current from the line.

This implementation offers new features like electronic

hook switch and call progress monitoring (on-hook

dialling).

Call progress monitoring (CPM) means pressing the LS

key will switch the telephone on from standby (direct

´wake-up´from keyboard) and will present the dialling

tones via a loudspeaker without lifting the handset.

Furthermore, it is also possible to invoke the CPM by

pressing the LNR, MEM or M1 - 9 when the ACP

(Automatic Call Progress) is activated (diode 5).

Option

Column

Function

No diode

diode

NoP

Number of Pulses

Standard

Digit 1

010

Flash Time

101.2 ms

600 ms

Memory Size

M/B

Make/Break Ratio

33/66 ms

40/60 ms

ACP

Automatic Call Progress

yes

MODE

Default Signalling Mode

ProcedurePrinciples

The procedures for utilizing the features of the device are

optimized out of consideration for the human factor

in order to:

- meet the user´s expectations

- be easy to learn and relearn

- not invoke any automatic functions which the user

doesn’t expect

- protect the user from committing critical errors, e.g.

dialling wrong numbers, deleting stored numbers, etc.

- be consistent, simple and usable.

Columns

Row 5

MODE

ACP

M/B

NoP

The diode options

are scanned by

POR and low to

high transition on

HS.

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