KOMUNIKASI DATA

Layer Data Link

Presented by:

Kukuh Nugroho 1

Layer Data Link Fungsi: mengubah data logic menjadi data fisik.

Data Logic

Data Fisik

[email protected]

2

Layer Data Link - Implementasi

[email protected]

3

Enkapsulasi [Flash Back]

Header

Header

Header

DATA

Aplikasi

7

DATA

Transport

4

Network

3

Data Link

2

DATA

DATA

Trailer

 Format header & trailer tergantung dari protokol di layer data link yang digunakan.

[email protected]

4

Protokol di Layer Data Link

Model Referensi OSI

Model Referensi TCP/IP

Contoh Protokol

Layer Aplikasi Layer Presentasi

Layer Aplikasi

SMTP

HTTP

DHCP

OSPF

FTP

Layer Sesi

Layer Transport

Layer Transport

Layer Network

Layer Internet

UDP

TCP

ARP

IP

ICMP

Layer Data Link Layer Data Link

Ethernet

PPP

Frame Relay

Layer Fisik

[email protected]

5

[email protected]

6

Standar Ethernet

Sub-layer Data Link LLC (Logical Link Control)  Sebagai penyambung ke layer atas-nya.  Pengambil data logic.  Di implementasikan dalam bentuk software. MAC (Media Access Control)  Pengubah dari data logic ke fisik.  Penghubung ke media.

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7

Implementasi Ethernet

Syarat terhubung 1

2

media Pilihan NIC

fiber optic

[email protected]

8

Tipe Ethernet

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9

Format Frame Ethernet

Header

  

Data

Trailer

DA (Destination Address)  alamat MAC perangkat pengirim SA (Source Address)  alamat MAC perangkat penerima FCS (Frame Check Sequence)  untuk ngecek apakah frame yang diterima dalam keadaan rusak ataukah tidak?

[email protected]

10

[email protected]

11

FCS (Frame Check Sequence)



FCS  salah satu metode yang digunakan adalah CRC (Cyclic Redundancy Check).



Terminologi CRC  Codeword : data yang dikirimkan  Dataword : data awal sebelum proses pengiriman



Metode CRC  Melakukan proses pembagian antara “codeword” dengan bilangan biner pembagi. Apabila: ∑ bit “dataword” = k bit ∑ bit “pembagi” = n - k + 1 ∑ bit “codeword” = n bit

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12

Encoder dan Decoder CRC

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13

Menentukan Frame Rusak ataukah Tidak ?

Contoh soal

Kabel UTP

PC1

PC2

Diketahui sebuah komputer sedang mengirimkan bit “1001” melalui media kabel UTP. Apabila antara perangkat encoder dan decoder sepakat untuk menggunakan bilangan biner pembagi “1011”, buatlah perhitungan dengan: a. Skenario pengiriman frame tanpa adanya frame yang rusak di sisi perangkat penerima! b. Skenario pengiriman frame dengan tanpa adanya frame yang rusak di sisi perangkat penerima!

[email protected]

14

Menentukan Frame Rusak ataukah Tidak ?

Panduan untuk mengerjakan contoh soal: 1. Operasi pengurangan menggunakan aturan gerbang logika XOR.

2. Jika nilai bit paling kiri dari bilangan biner yang dibagi ‘1’, maka kalikan nilai bilangan biner pembagi dengan nilai bit ‘1’. 3. Jika nilai bit paling kiri dari bilangan biner yang dibagi ‘0’, maka kalikan nilai bilangan biner pembagi dengan nilai bit ‘0’. 4. Jika sisa bagi di sisi perangkat penerima:  “nol” : tidak ada frame yang rusak.  “tidak nol” : ada frame yang rusak. [email protected]

15

16

Temu 8 - Layer Data Link.pdf

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