Lapisan fisik

	Model lima-lapis TCP/IP
	5. Lapis aplikasi
	DHCP · DNS · FTP · Gopher · HTTP · IMAP4 · IRC · NNTP · XMPP · POP3 · SIP · SMTP · SNMP · SSH · TELNET · RPC · RTCP · RTSP · TLS · SDP · SOAP · GTP · STUN · NTP · (more)
	4. Lapis transpor
	TCP · UDP · DCCP · SCTP · RTP · RSVP · IGMP · (more)
	3. Lapis jaringan/Internét
	IP (IPv4 · IPv6) · OSPF · IS-IS · BGP · IPsec · ARP · RARP · RIP · ICMP · ICMPv6 · (more)
	2. Lapis tumbu data
	802.11 (WLAN) · 802.16 · Wi-Fi · WiMAX · ATM · DTM · Token ring · Ethernet · FDDI · Frame Relay · GPRS · EVDO · HSPA · HDLC · PPP · PPTP · L2TP · ISDN · ARCnet · (more)
	1. Lapis fisik
	Ethernet physical layer · Modems · PLC · SONET/SDH · G.709 · Optical fiber · Coaxial cable · Twisted pair · (more)
	Kotak ieu: tempo • sawala • édit

Modél OSI
7	Lapisan aplikasi
6	Lapisan pidangan
5	Lapisan sési
4	Lapisan angkutan
3	Lapisan jaringan
2	Lapisan tumbu data Sublapisan LLC; Sublapisan MAC;
1	Lapisan fisik

Lapisan fisik (Basa Inggris: physical layer Basa Walanda: fysieke laag) nyaéta hiji hambalan kahiji tina tujuh hambalan model OSI dina jaringan komputer, ogé mangrupa hambalan kahiji tina lima hambalan dina model rujukan TCP/IP. Lapisan ieu ngawangun layanan nu dipaké dina lapisan tumbu data (data link layer).

Artikel ieu keur dikeureuyeuh, ditarjamahkeun tina basa Inggris.
Bantuanna didagoan pikeun narjamahkeun.

The physical layer is the most basic network layer, providing only the méans of transmitting raw bits rather than packets over a physical data link connecting network nodes. No packet héaders nor trailers are consequently added to the data by the physical layer. The bit stream may be grouped into code words or symbols, and converted to a physical signal, which is transmitted over a physical transmission medium. The physical layer provides an electrical, mechanical, and procedural interface to the transmission medium. The shapes of the electrical connectors, which frequencies to broadcast on, what modulation scheme to use and similar low-level paraméters are specified here. An analogy of this layer in a physical mail network would be the roads along which the vans carrying the mail drive.

Physical signaling sublayer

In a local area network (LAN) or a metropolitan area network (MAN) using open systems interconnection (OSI) architecture, the physical signaling sublayer is the portion of the physical layer that:

interfaces with the medium access control sublayer (MAC) which is a part of the Data Link Layer
performs character encoding, transmission, reception and decoding
performs mandatory isolation functions.

Source: from Federal Standard 1037C

List of Physical layer services

The major functions and services performed by the physical layer are:

Bit-by-bit node-to-node delivery
Providing a standardized interface to physical transmission media, including
- Mechanical specification of electrical connectors and cables, for example maximum cable length
- Electrical specification of transmission line signal level and impedance
- Radio interface, including electromagnetic spectrum frequency allocation and specification of signal strength, analog bandwidth, etc.
- Specifications for IR over optical fiber or a wireless IR communication link
Modulation
Line coding
Bit synchronization in synchronous serial communication
Start-stop signalling and flow control in asynchronous serial communication
Circuit mode multiplexing,^[rujukan?] as opposed to statistical multiplexing performed at the higher level
- Establishment and termination of circuit switched connections
Carrier sense and collision detection utilized by some level 2 multiple access protocols
Equalization filtering, training sequences, pulse shaping and other signal processing of physical signals
Forward error correction,^[rujukan?] for example bitwise convolutional coding
Bit-interleaving and other channel coding

The physical layer is also concerned with

Point-to-point, multipoint or point-to-multipoint line configuration
Physical network topology, for example bus, ring, mesh or star network
Serial or parallel communication
Simplex, half duplex or full duplex transmission mode
Autonegotiation

Conto lapisan fisik

Modem jaringan telepon V.92
Lapisan fisik IRDA
Lapisan fisik USB
Firewire
EIA RS-232, EIA-422, EIA-423, RS-449, RS-485
ITU Recommendations: see ITU-T
DSL
ISDN
T1 and other T-carrier links, and E1 and other E-carrier links
10BASE-T, 10BASE2, 10BASE5, 100BASE-TX, 100BASE-FX, 100BASE-T, 1000BASE-T, 1000BASE-SX and other varieties of the Ethernet physical layer
Varieties of 802.11
SONET/SDH
Antarbeunget GSM
Lapisan fisik Bluetooth
Lapisan fisik Wi-Fi IEEE 802.11x
Etherloop
Hybrid Fibre Coaxial

Conto kalengkepan hadwér (titik jaringan)

Note: Physical layer Associated with transmission of unstructured bit stréams over a physical link. Responsible for the mechanical, electrical and procedural characteristics that establish, maintain and déactivate the physical link.

Tempo ogé

Rujukan