Dantel 49018 Скачать руководство пользователя страница 6

P

AGE

 6

49018-0697 <90-00089>

Clearing

The 49018 can be cleared internally or externally. When

strapped for internal clearing, the digit counter is restored three

seconds after a complete code is received, whether it is valid or

not. When strapped for external clearing, the busy circuit and

the digit counter are restored by a “Power-up Clear”, a “Reset”

input, or by internal decoding a “*”, “#”, or “C” BCD input,

depending on strapping.

Internal Clearing:

 When the  reset strap is IN, the interdigit

timer and reset circuit clears the entire station decoder three

seconds after the last digit is entered, or if three seconds pass

between digits. If the reset strap is OUT, the circuit wil not reset

after the last digit, but will reset if three seconds pass between

digits.

External Clearing:

 Three modes external clearing can be used

to clear or reset the 49018 subassembly:

A reset (ground) is provided from the station or PABX/Trunk

Interface Module (44022 or 44023) at P2-8 or a “Power-up

Clear” at P2-9.

The second mode is provided when the “#” or “*” BCD out-

puts of the supervisory decoder are strapped to the clear and

set outputs. Normally, the “#” is used to set the busy latch

and the “*” will clear the busy latch. This function can be set

to reverse the busy latch operation. The busy latch, when set,

provides a ground at P2-7 and applies a reset pulse through

the busy reset pulse circuit to clear the 49018 and prepare it

to accept the next address. The busy latch remains set until

it is cleared by the xternal reset, “Power-up Clear”, or an

internal BCD output from the supervisory decoder.

The third mode can be used when the “A” and “C” BCD codes

are strapped IN and perform the same functions as described

for the “#” and “*” BCD supervisory decoder outputs.

Power-up Busy

A power-up busy input at P2-12 is provided to set the busy latch

when the power-up signal from the 44020 DTMF Decoder

Module is received. The busy latch may be cleared by external or

internal sources as described above.

Clear Output

A clear output (ground) is applied to the 44022 or 44023 inter-

face modules using P2-10 each time the 49018 is cleared.

Toll Restriction Outputs

A toll restriction output is provided whenever a “0” or “1” BCD

signal is decoded by the supervisory decoder. The “0” or “1”

outputs do not require a reset code. They are applied through

respective buffer drivers at P2-5 or P2-6 to an external device

when toll restriction to a public telephone is desired.

CIRCUIT DESCRIPTION

Содержание 49018

Страница 1: ...ore complete information on electrostatic discharge safety precautions refer to BellcoreTM Technical Reference TR NWT 000870 Copyright 1997 by Dantel Inc Dantel is a registered trademark of Dantel Inc...

Страница 2: ...s Initiation of loopback testing Utilization of and BCD data or A and C BCD data to provide a busy control output and clear output The 49018 subassembly also provides a toll restriction function and a...

Страница 3: ...sy control clear and 0 and 1 digits The outputs are applied to the 44022 Station Interface Module or the 44023 PABX Trunk Interface Module of the 440 CMS or TMS Miniature 10 digit switches on the 4901...

Страница 4: ...IGIT COUNTER FROM BCD BUSS Q1 RING GENERATOR START NOTE SYMBOLS ARE FUNCTIONAL LOGIC ONLY DELAY ENABLE DIGIT SELECT 1 2 3 BUSY RESET PULSE STATION 2 ADDRESS COMPAR ATOR STATION 2 DRIVER INTER DIGIT AN...

Страница 5: ...it count selected by the digit strap option the address in the address buffer latch is compared to the preset address code selected by the miniature 10 digit switches If the code matches the matching...

Страница 6: ...he is used to set the busy latch and the will clear the busy latch This function can be set to reverse the busy latch operation The busy latch when set provides a ground at P2 7 and applies a reset pu...

Страница 7: ...is output is switched to ground through the open collector of Q1 The ground enables the ring generator and the ring ring back interrupt functions The 49018 subassembly is mounted to a 44020 DTMF Decod...

Страница 8: ...OK BUSY TONE RING BACK TONE ALERT TONE RING INTERRUPT RING GEN SUPPLY 31 RING GEN SUPPLY 23 43 21 19 RING GEN ENABLE 12 11 10 9 8 7 5 6 4 3 2 1 16 15 13 22 16 55 3 22 39 26 24 35 23 21 25 31 RING STAR...

Страница 9: ...s to the supervisory decoder and are normally strapped to set and clear respectively the busy latch circuit and station one and two address latches when a 12 button DTMF phone pad is used The A and C...

Страница 10: ...usy with A Reset with C STRAP SETTING OR SWITCH Reset IN Reset OUT Digit 1 Digit 2 Digit 3 S1 S2 S3 S4 S5 S6 SET CLR SET CLR SET A CLR C Installation Verify that the option straps are installed as des...

Страница 11: ...ps are set for system operation reinstall 44020 in shelf and apply power RESULTS Power up Clear resets all 49018 subassembly circuits CKT 1 LED on front panel comes ON Station 1 44022 or 44023 functio...

Страница 12: ...18 0 mA 0 03 BTU Hr 0 62 BTU Hr CMOS 100K ohms to 10 VDC Logic 1 0 0 5VDC ground Logic 0 10 0 5VDC Decoded state is Logic 1 Open Drain 200 mA 21 to 56VDC Logic 1 0 0 5VDC ground Logic 0 10 0 5VDC Dec...

Страница 13: ...49018 0697 90 00089 PAGE 13 NOTES...

Страница 14: ...instrument signed by a duly authorized officer of the Seller and accepted by the Buyer Warranty and remedies on products not manufactured by the Seller are in accordance with warranty of the respecti...

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