Matakuliah
Tahun
Versi
: H0484/Jaringan Komputer
: 2005
: 1/0
Pertemuan 16
Layer Data Link - Lanjutan
1
Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
• Menjelaskan ketentuan baku dan format frame pada
data link layer
2
Outline Materi
• Standards
• Frame format
3
Frame Structure
• In synchronous transmission all transmissions are
in frames
• Single frame format for all data and control
exchanges
• Basic Structures:
– Character Oriented Protocol (COP) - BSC
(Bisynchronous)
– Bit Oriented Protocol (BOP) - HDLC, SDLC
4
Generic Frame Structure (BOP)
5
Bit stuffing and removal
Bit stuffing is the process of adding one extra 0 whenever there
are five consecutive 1s in the data so that the receiver does not
mistake the data for a flag.
6
Data Link Protocols
•
•
•
•
HDLC - High-Level Data Link Control
SDLC - Synchronous Data Link Control
PPP - Point to Point Protocol
Ethernet
HDLC can be considered as the base protocol format
7
High-Level Data Link Control
Frame format for bit-oriented protocols.
8
PPP – Point to Point Protocol
The PPP full frame format for unnumbered mode operation.
9
Protocol stack
Link Control Protocol (LCP)
Authentication Protocols
Network Control Protocol (NCP)
Bit Padding
Digital Signals (DS) Services
10
Encapsulated LCP packet
11
PPP – Point to Point Protocol
12
An example
13