Media Transmisi
Media Transmisi
Pengertian Media Transmisi
• Media transmisi : penghubung fisik antara transmiter danreceiver dalam sistem komunikasi
Faktor Penentu KecepatanData• Bandwith
• Luas atau lebar cakupan frekuensi yg difungsikan oleh sinyal dalam medium transmisi
• Kerusakan Transmisi
• Interferensi (dibungkus)
• Jumlah penerima
Transmission medium and physical layer
Klasifikasi Media Transmisi
1 Guided Media
• Kabel Twisted-Pair
• Kabel Coaxial
• Kabel Fiber-Optic
UTP dan STP
Twisted-pair cable
Table 1 Kategori Kabel UPT (Unshielded Twisted-Pair)
Category Bandwidth Data Rate Digital/Analog Use
1 very low < 100 kbps Analog Telephone
2 < 2 MHz 2 Mbps Analog/digital T-1 lines
3 16 MHz 10 Mbps Digital LANs
4 20 MHz 20 Mbps Digital LANs
5 100 MHz 100 Mbps Digital LANs
6 (draft) 200 MHz 200 Mbps Digital LANs
7 (draft) 600 MHz 600 Mbps Digital LANs
Konektor UTP (RJ45)
UTP performance
Kabel Coaxial
Category Impedance Use
RG-59 75 W Cable TV
RG-58 50 W Thin Ethernet
RG-11 50 W Thick Ethernet
Table 2 Kategori Kabel coaxial
BNC connectors
Performans Coaxial KabelCoaxial
Pembiasan sinar dalam medium optik
Pembiasan berkas sinar dalam Fiber Optis
Mode-mode Perambatan Cahaya( Propagation modes )
Modes Fiber Optic
Tabel 3 Tipe tipe Fiber Optic
Type Core Cladding Mode
50/125 50 125 Multimode, graded-index
62.5/125 62.5 125 Multimode, graded-index
100/125 100 125 Multimode, graded-index
7/125 7 125 Single-mode
Konstruksi Fiber Optic
Warna : patch cord
Jenis Konektor Kabel Fiber-optic
Perfomans Fiber-Optic
2 Unguided Media: Wireless
Radio Waves
Microwaves
Infrared
Spektrum Electromagnetic untuk Komunikasi Wireless
Metode Perambatan (Propagation) Gelombang
Tabel 4 Pembangian Band (Pita frekuensi)
Band Range Propagation Application
VLF 3–30 KHz Ground Long-range radio navigation
LF 30–300 KHz GroundRadio beacons and
navigational locators
MF 300 KHz–3 MHz Sky AM radio
HF 3–30 MHz SkyCitizens band (CB),
ship/aircraft communication
VHF 30–300 MHzSky and
line-of-sightVHF TV,
FM radio
UHF 300 MHz–3 GHz Line-of-sightUHF TV, cellular phones,
paging, satellite
SHF 3–30 GHz Line-of-sight Satellite communication
EHF 30–300 GHz Line-of-sight Long-range radio navigation
Gelombang Transmisi Wireless
Antena Omnidirectional
Gelombang Radio dapat digunakanuntuk komunikasi multicast seperti : radio dan television.
Catatan:
Unidirectional antennas
Microwaves dapat digunakan untukkomunikasi unicast seperti: cellular telephones, satellite networks, danwireless LANs.
Catatan:
Sinyal Infrared dapat digunakan untukkomunikasi jarak dekat (short-range), menggunakan perambatan LOS (line-of-sight )
Catatan: