AS2533 datasheet(7/25 Pages) AMSCO

7 / 25 page

Rev. 7

July 1998

Data Sheet

AS2533...6

The centrex keys are not stored in the RAM, and

subsequently entered digits are buffered in FIFO.

Last Number Redial

LNR is a facility that allows resignalling of the last

manually dialled number without keying in all the digits

again. The LNR is repeatable after each off-hook.

The current content of the RAM is overwritten by new

entries.

A manually entered number is automatically stored in

the LNR RAM. The capacity of the RAM is 31 digits. If a

number greater than 31 digits is entered, the LNR facility

will be inhibited (until new entries < 32 digits) and further

entries will be buffered in FIFO.

Pauses can be inserted by pressing the PS key (not

AS2535).

Post dialled digits, i.e. digits manually entered after LNR

has been invoked, are not stored in RAM but buffered in

FIFO.

Repeat Dialling (not AS2535)

The last manually dialled number can be repeated

without going on-hook by pressing the RP key. If a

called number is engaged, pressing the RP key will

break the line for 1.6 second (to get a new dial tone) and

after a pause the number will be repeated.

The repeat function is enabled when prior to pressing

the RP key, a number has been dialled, and it can be

invoked an unlimited number of times until next on-hook.

During the 1.6 second break the device is in power down

mode to save current.

Recall Function

A recall (R1, R2 or R3 key) activation will invoke a flash

(timed loop break), however, the R1 flash is never

executed in LD mode. R2 and R3 will be executed

independent of the mode.

If recall is the first entry in a digit string, it will be stored

in LNR RAM when digit(s) are entered after the recall.

If the recall key is depressed after a digit string has been

entered or dialled out, the recall will not be stored but

buffered in the FIFO together with subsequently entered

digit.

If pressing the recall key is not followed by digit entries,

the LNR RAM remains intact.

After a recall a 270 ms pause will automatically be

executed.

Memory Keys (not AS2534)

The keys M1 to M12 are direct memory access keys and

the MR key (AS2533/6 only) is used for abbreviated

dialling.

Memory arrangement

AS2533/6 AS2534 AS2535

Storable numbers

Direct memory keys

Indirect memories

In the on chip RAM, numbers can be stored. Each

number can contain up to 21 digits (including pauses).

During programming multiple pauses can be inserted by

pressing the PS (not AS2535) or the LNR key. Each

pause inserted within the first 5 entries will automatically

be terminated after 2 seconds whereas pauses inserted

after location 5 in a digit string will halt dialling and can

be terminated manually by pressing the PS (not AS2535)

or the LNR key. The halt function allows in-dialling to an

extention on a PABX.

Example (45678–123 is stored in M1, where – is a

pause/wait and 123 the extention number):

off-hook, wait for dial tone

press M1 (45678 is dialled out)

await dial tone from called PABX

press PS or LNR (123 is dialled out).

Memory dialling is cascadable. However, the content of

one memory must be dialled out before a new can be

invoked.

Sliding 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.

Example (LNR content 912345, where 9 is access

code):

off-hook, wait for PABX dial tone

press 9 and wait for external dial tone

press LNR (12345 will be dialled out).

Tone Generator

The tone generator incorporates the DTMF tones, 3

basic frequencies for the tone ringer and pacifier tones.

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