The Strowger step-by-step systemMusa Ibrahim2208100047

Ingat?

•Switching•Evolusi Teknologi Switching

▫Manual switching▫Electromechanical switching

Step-by-step (Strowger switch)

Perkembangan Switching

•Fungsi switching dilakukan secara manual oleh manusia (operator)

• Privacy tidak terjaga

Kelemahan Manual Switching

Strowger Exchange• The first

automatic exchange

• A mechanical exchange

• Ditemukan oleh Almon Brown Strowger (1839 – May 26, 1902)

• Disebut juga dengan nama Step-by-step exchange

• Tidak perlu ada operator▫ Perlu perangkat

pendial

Strowger switch• A 100 line

Strowger switch:▫ Tiap user punya selector masing-

masing▫ Tidak ada

concentrators▫ mahal

Two motion selector

Source:M. P. Clark, Networks and Telecommunications Design and Operation – 2nd Edition, John Wiley & Sons Ltd, pp. 93, 1997.

Strowger two-motion selector

Uniselector

Source:M. P. Clark, Networks and Telecommunications Design and Operation – 2nd Edition, John Wiley & Sons Ltd, pp. 90, 1997.

Strowgeruni-selector

Uni-selector:

Prinsip kerja

0987654321

0987654321

0987654321

0987654321

1st 2nd 3rd Final

A

B

C

Group Selector

sentral

Register-translator-senders

•Menerima dan menyimpan digits•ISD (international subscriber dialling)

Distribution Frames

•MDF (main distribution frame)•IDF (intermediate distribution frame)•TDF (trunk distribution frame)

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