Defines how data is transmitted between devices, from the physical perspective.
Important becase:
- Interoperability
Standards ensure equipment from various vendors can work together seamlessly. - Performance predictability
Engineers can design systems with known performance characteristics. - Troubleshooting
Standardization simplifies diagnostics and problem resolution. - Scalability
Standards enable networks to grow without compatibility issues. - Cost efficiency
Standardized components typically cost less than proprietary solutions.
Common Transmission Media Standards
Copper-Based Standards
- Cat5e/Cat6/Cat6A
TIA/EIA-568 standards for twisted pair cabling that define performance parameters like maximum length (100m), bandwidth (1Gbps to 10Gbps), and crosstalk limits. - RG-6/RG-59
Coaxial cable standards used in cable television and some network applications.
Fiber Optic Standards
- OM3/OM4/OM5
Multimode fiber standards optimized for different wavelengths and distances. - OS1/OS2
Single-mode fiber standards for long-distance transmission up to 10km or more. - G.652/G.655
ITU-T standards that define optical fiber characteristics for telecommunications.
Wireless Standards
- IEEE 802.11ac/ax/be
Wi-Fi standards defining frequencies, modulation schemes, and protocols. - Bluetooth (IEEE 802.15.1)
Short-range wireless standard for personal area networks. - 5G NR (New Radio)
3GPP standard for cellular networks with enhanced data rates and lower latency.
IEEE 802
A crucial family of specifications for local area networks (LANs) and metropolitan area networks (MANs). Developed and maintained by IEEE. Ensure compatibility and interoperability across network devices and technologies.
Specific IEEE 802 Standards
- IEEE 802.1
Covers higher-level interface standards, including bridging, network management, and security protocols. - IEEE 802.3 (Ethernet)
Defines wired Ethernet technology, from physical media specifications to frame formats and access methods. Includes variants like 10BASE-T, 100BASE-TX, 1000BASE-T, and modern 10/40/100 Gigabit Ethernet. - IEEE 802.11 (Wi-Fi)
Specifies wireless LAN protocols across various frequency bands. Encompasses popular versions like 802.11n, 802.11ac, 802.11ax (Wi-Fi 6), and emerging 802.11be (Wi-Fi 7). - IEEE 802.15
Covers wireless personal area networks (WPANs). 802.15.1 formed the basis for Bluetooth, and 802.15.4 underpins technologies like ZigBee and Thread. - IEEE 802.16 (WiMAX)
Defines broadband wireless access for metropolitan area networks.
Structure of IEEE 802 Standards
Each IEEE 802 standard typically addresses specific layers of the OSI model:
- Physical layer (Layer 1)
Defines electrical, mechanical, and procedural interfaces. - Data link layer (Layer 2)
Split into two sublayers: Media Access Control (MAC), which controls how devices gain access to the medium, and Logical Link Control (LLC), which handles flow control and error checking.