Tulang punggung (backbone)

Topologi Pohon adalah kombinasi karakteristik antara topologi bintang dan topologi bus.

Topologi ini terdiri atas kumpulan topologi bintang yang dihubungkan dalam satu topologi bus sebagai jalur tulang punggung atau backbone.

Komputer-komputer dihubungkan ke hub, sedangkan hub lain di hubungkan sebagai jalur tulang punggung.

Topologi jaringan ini disebut juga sebagai topologi jaringan bertingkat.

Topologi ini biasanya digunakan untuk interkoneksi antar sentral dengan hierarki yang berbeda.

Untuk hierarki yang lebih rendah digambarkan pada lokasi yang rendah dan semakin keatas mempunyai hierarki semakin tinggi.

Topologi jaringan jenis ini cocok digunakan pada sistem jaringan komputer.

Pada jaringan pohon, terdapat beberapa tingkatan simpul atau node.

Pusat atau simpul yang lebih tinggi tingkatannya, dapat mengatur simpul lain yang lebih rendah tingkatannya.

Data yang dikirim perlu melalui simpul pusat terlebih dahulu.

Misalnya :

Untuk bergerak dari komputer dengan node-3 kekomputer node-7 seperti halnya pada gambar, data yang ada harus melewati node-3, 5 dan node-6 sebelum berakhir pada node-7.

Keunggulan jaringan pohon seperti ini adalah, dapat terbentuknya suatu kelompok yang dibutuhkan pada setiap saat.

Sebagai contoh, perusahaan dapat membentuk kelompok yang terdiri atas terminal pembukuan, serta pada kelompok lain dibentuk untuk terminal penjualan.

Adapun kelemahannya adalah, apabila simpul yang lebih tinggi kemudian tidak berfungsi, maka kelompok lainnya yang berada dibawahnya akhirnya juga menjadi tidak efektif.

Cara kerja jaringan pohon ini relatif menjadi lambat.

Menurut J.Joel, topologi ini menggunakan banyak kabel dan di Backbone [Kabel terbawah] merupakan pusat dari topologi ini.

11 Replies to “Tulang punggung (backbone)”

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