SA2532KB datasheet(7/21 Pages) SAMES

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SA2532KA/B

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Moving Cursor Procedure

To accommodate easy and uncomplicated redialling

(LNR) behind a PABX, a sliding cursor protocol is

implemented.

If new entries match the previous

RAM contents, pressing the LNR key will dial out

the remaining digits. If there is an error in matching,

the LNR will be inhibited until next on-hook, and the

RAM will contain the new number. In the case of

mixed mode LNR operation the redialling in the

SA2532KA is limited to the LD digits so as to

prevent unauthorised access to banking passwords

etc. The SA2532KB will dial out all digits (i.e. both

the pulse and the DTMF digits) during mixed mode

re-dialling.

DTMF Tones

The DTMF generator provides 7 frequencies,

namely:

Low group

Digit 1-2-3

697Hz

Digit 4-5-6

770Hz

Digit 7-8-9

852Hz

Digit *-0-#

941Hz

High group

Digit 1-4-7-*

1209Hz

Digit 2-5-8-0

1336 Hz

Digit 3-6-9-#

1477Hz

The MF output levels are -6/-8 dBm and the

preemphasis is 2.6dB.

Tone Ringer

The Tone Ringer of the SA2532K incorporates a

Discriminator Circuit and a three tone Melody

Generator.

When a Valid Ring Signal is detected the Melody

generator is activated and creates a ringing signal

comprising

frequencies

(1065Hz),

(1420Hz) and F3 (1734Hz).

These frequencies are repeated in a sequence of 6

time slots constructed by the frequencies

This sequence is repeated 7 times per second.

Ring Frequency Discrimination

The Ring Frequency Discriminator assures that

signals with a frequency between 13 Hz to 70 Hz

are regarded as valid ring signals. When a valid ring

signal is detected, the melody generator is activated

and remains active as long as the ring signal is

present. Once the melody generator has been

started, the ring signal is continuously monitored

and the melody generator is instantly turned on or

off according to the momentary presence of a valid

or invalid ring signal respectively (until next POR of

off-hook).

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