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Showing posts from September, 2016

history of telecom

Symbols | Language | Tools Acknowledgement:  to our ancestors, who lived on this planet 2.3 million years ago and invented the first tool, the split stone (which, they used for cutting and scraping meat) [how early human got the idea of consuming plants and flesh?] Fire was discovered. Controlled Fire was invented. technology: ∴ ∵ Talking Drums were used by natives in Africa, New Guinea and South America, Smoke Signals in North America and China. 1642: a nineteen-year-old French boy named Blaise Pascal invented an adding machine for his father, who was a clerk by profession. 1745: Leyden Jar 1760: the force on magnetic poles obeyed an inverse-square law was proposed by Johann Tobias Mayerin. 1762: 'force on electrically charged objects obeys an inverse-square law' was proposed by Henry Cavendish 1772: Warren Hastings became the first Governor-General of India, under him, the East India Company took over revenue collection directly in the Bengal Presiden

computer repairing

OverHeating Do not block the Ventilation Consider Replacing Battery Lower the Brightness End Useless Processes Clean temp, %temp% and Recycle-bin Underclocking the Chipset (through BIOS) Undervolting the CPU (through BIOS) Set your energy plan to "balanced" Remove the Battery. Connect the PC directly to the Mains (ofcourse, through the Adapter) Install  SpeedFan.exe Buy  Air-Can Buy Thermal Paste Buy  Vaccum Cleaner Buy  Cooling Pad Buy  Air-Conditioner  (for Ambience) Buy Emami's Navratna  (for Self) Viruses and Malwares Anti-malware

156.25 bits / 576.92 μsec : 1 Time Slot of GSM

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1 Time Slot = 1 Burst 8 Time Slots = 1 TDMA Frame Tail Bits- Encrypted Data Bits -Stealing Flag Bit-Tng. Sequence(Midamble)-Stealing Flag Bit- Encrypted Data Bits -Tail Bits-Guard Period 156.25 bits / 576.92 μsec : 1 Time Slot of GSM (Burst) or 156.25 bits per 0.57692 millisec or 156.25 bits per 0.00057692 sec 3 hrs. 28 min. 53.76 sec or 12533.76 sec 156.25*8*26*51*2048 = = 3394560000 bits => 3394560000/ or 3.4 Gigabits of data in almost 3.5 hrs. 270.83478 Kilobits of data in one second or GSM burst rate: 270 kbps 1 burst lasts for around half milli-second.  576.92 μsec -----------------> 1 Burst 1000.00 μsec ----------------> ? Bursts ? = 1000.00/576.92 ? = 1.73334258 Bursts or less than 2 bursts per second or less than quarter-to-two bursts per second (<1.75 bursts/sec) Around 2 bursts per second 1 bit duration around 3.7μsec http://www.rfwireless-world.com/Tutorials/gsm-frame-structure.html ----------

CAT5e

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Category 5 cable, commonly referred to as CAT5, is a twisted pair cable for carrying signals (such as data, telephony or/and video). This type of cable is used in structured cabling for computer networks such as Ethernet. The cable standard provides performance of up to 100 MHz and is suitable for... 10BASE-T (TP Ethernet), 100BASE-TX (Fast Ethernet), and 1000BASE-T (Gigabit Ethernet). 10BASE-T is also known as EoTP i.e. Ethernet over Twisted Pair. 10BASE-T The name 10Base-T is derived from several aspects of the physical medium. The 10 refers to the transmission speed of 10 Mbps. The base is short for baseband, which means that only one Ethernet signal is present on the send and/or receive pair (i.e., there is no multiplexing as with broadband transmissions). The T comes from twisted pair. It is the Ethernet wiring standard for 10 Mbps (megabits per second) for a maximum distance of approximately 100 meters per segment over UTP i.e. Unshielded Twisted Pair cables terminated with

Realtek PCIe GBE Family Controller

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Realtek PCIe : Peripheral Component Interconnect-express GBE:  GigaBit Ethernet

ISPs around me

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1. Nextra      2. Tikona 3. TPTL Triple Player Telecom Pvt. Ltd. is a leader in providing Video , Voice and Data (Triple Play) services. 4. Airtel

digital sources to facebook

https://en.wikipedia.org/wiki/Template:Morse_code https://en.wikipedia.org/wiki/Template:Technology https://en.wikipedia.org/wiki/Category:Internet-related_lists https://en.wikipedia.org/wiki/List_of_Internet_exchange_points_by_size https://en.wikipedia.org/wiki/Tier_1_network#List_of_tier_1_networks https://en.wikipedia.org/wiki/Template:Telecommunications https://en.wikipedia.org/wiki/Template:Radio_spectrum https://en.wikipedia.org/wiki/Template:Audio_broadcasting https://en.wikipedia.org/wiki/Template:Electromagnetism https://en.wikipedia.org/wiki/Template:Fundamental_interactions https://en.wikipedia.org/wiki/Template:Branches_of_physics https://en.wikipedia.org/wiki/Template:Natural_science https://en.wikipedia.org/wiki/Template:OSI_model https://en.wikipedia.org/wiki/Template:Multiplex_techniques https://en.wikipedia.org/wiki/Template:Modulation_techniques http://searchnetworking.techtarget.com/ http://www.microwave-link.com/ http://telecomwirelesstesting.
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pixel <---- character <---- (uP or uC) <-------  LVDC electric pulse (copper wires) <-----  light pulse (OFC) <-------- electromagnetic wave (RF coax cable) <--------- radio signal incident at sector antenna Radio signal incident at GSM sector antenna as EM wave EM wave (RF coax cable) Light pulse (OFC) LVDC electric pulse (copper wires) Bits (uP or uC) Character Pixel Radio signal incident at GSM sector antenna as EM wave of a specific frequency^. The antenna picks-up the frequency it has been designed for, and transmit that EM wave to RRU through a RF Co-axial cables  (called as Feeders and Jumpers). This EM wave is then converted* into optical domain and transmits the optical-pulses through Optical-Fiber Cable i.e. OFC into BMU (Baseband Main Unit; Ericsson's Baseband-5216) (fed with -48 DC Volts). The BMU is connected to the core network via a wireless backhaul link (microwave parabolic-dish antenna) [BMU outputs the ] Light pulse (OFC) LVDC el

analog resources to look-out

[Lawrence Harte, Bruce Bramley, Mike Davis] Introduction to GSM- Physical Channels, Logical Channels, Network Functions, and Operation. 3rd Ed. [Bruno Delorme] Antennas and Site Engineering for Mobile Radio Networks [Jyrki T. J. Penttinen] The Telecommunications Handbook: Engineering Guidelines for Fixed, Mobile and Satellite Systems [Haim Mazar (Madjar)] Radio Spectrum Management: Policies, Regulations and Techniques [Ayman ElNashar, Mohamed El-saidny, Mahmoud Sherif] Design, Deployment and Performance of 4G-LTE Networks: A Practical Approach [Juha Korhonen] Introduction to 4G Mobile Communications [André Perez] LTE & LTE Advanced: 4G Network Radio Interface [Trichy Venkataraman Krishnamurthy, Rajaneesh Shetty] 4G: Deployment Strategies and Operational Implications: Managing Critical [Harri Holma, Antti Toskala] LTE for UMTS: Evolution to LTE-Advanced [Ajay R. Mishra] Cellular Technologies for Emerging Markets: 2G, 3G and Beyond [Erik Dahlman, Stefan Parkvall

EM Induction :: Faraday :: 1831

1745: Leyden Jar 1780s: Immanuel Kant (Germany), a philosopher who is considered the central figure of modern philosophy. Kant argued that fundamental concepts of the human mind structure human experience, that reason is the source of morality, that aesthetics arises from a faculty of disinterested judgment, that space and time are forms of our sensibility, and that the world as it is "in-itself" is unknowable. 1782: the term “semiconducting” was used for the first time by Alessandro Volta. In 1800, Alessandro Volta (Italy) invented a galvanic battery inspiring Ørsted to think about the nature of electricity and to conduct his first electrical experiments. 1801: Hans Christian Ørsted (Denmark) received a travel scholarship and public grant which enabled him to spend three years travelling across Europe. In Germany he met Johann Wilhelm Ritter  (German), a physicist who believed there was a connection between electricity and magnetism. This made sense to Ørsted since he

induction cooker

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Max. Power Consumption: 2000W i/p: electrical energy (220V-240V/50Hz) o/p: 60ºC to 280ºC from 50 cycles per second of current o 24,000 cycles per second of current 24 kHz alternating current is passed through it coil of copper wire. The current in the spark-coil creates a dynamic magnetic field. ferromagnetic (having a high susceptibility to magnetization; iron, nickel, cobalt and most of their alloys) (the pan should be thicker than the skin depth) the magnetic field induces large eddy currents in the pot. The eddy currents flow through the electrical resistance of the pot to produce heat; the pot then in turn heats its contents by heat conduction. Often a thermostat is present to measure the temperature of the pan. This helps prevent the pan from severely overheating if accidentally heated empty or boiled dry, but also can allow the induction cooker to maintain a target temperature http://sjkelectrical.com.my/products/Philips-Single-Induction-Cooker-HD4902-(Sensor-Touc

IEEE 802.xx.y and "Feb, 1980"

IEEE 802 splits the OSI Data Link Layer into two sub-layers named  Logical Link Control  (LLC) and  Media Access Control  (MAC), so that the layers can be listed like this: Data link layer LLC Sublayer MAC Sublayer Physical layer Name Description Note IEEE 802.1 Higher Layer LAN Protocols active IEEE 802.2 LLC disbanded IEEE 802.3 Ethernet active IEEE 802.4 Token bus disbanded IEEE 802.5 Token ring  MAC layer disbanded IEEE 802.6 MANs  ( DQDB ) disbanded IEEE 802.7 Broadband LAN using Coaxial Cable disbanded IEEE 802.8 Fiber Optic TAG disbanded IEEE 802.9 Integrated Services LAN (ISLAN or isoEthernet) disbanded IEEE 802.10 Interoperable LAN Security disbanded IEEE 802.11 Wireless LAN  (WLAN) & Mesh ( Wi-Fi  certification) active IEEE 802.12 100BaseVG disbanded IEEE 802.13 Unused [2] Reserved for  Fast Ethernet  development [3] IEEE 802.14 Cable modems disbanded IEEE 802.15 Wireless PAN active IEEE 802.15.1 Bluetooth  certification IEEE 802.15.2 IEE

Layers and compatible devices and protocols

--------------------------------------------------------------------------------- Layer 1: PHY Equipments : LAN Repeater, LAN Hub, InfraRed TRX, Bluetooth Protocols : RJ-45, EIA/TIA-232, Ethernet ( IEEE 802.3 ), WLAN ( IEEE 802.11 ), --------------------------------------------------------------------------------- Layer 2.1: MAC Equipments: LAN Switch, Modulator-Demodulator, Protocols: Layer 2.2: LLC Equipments:  LAN Switch, Modulator-Demodulator, Protocols: --------------------------------------------------------------------------------- Layer 3: Network Equipments:  LAN Switch, Modulator-Demodulator, Protocols:

triple deity of network

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Hub | Repeater  : Layer 1 (Physical Layer): Bits Switch | Bridge  : Layer 2 (Data-Link Layer): Frames Router | Gateway:  Layer 3: (Network Layer): Packet ----------------------------------------------------------------------------------------------------------------------------------