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MW Tx Overview&Apps

MW Transmission Overview & Applications

QuestionAnswer
What are the main benefits of Microwave transmission? -Quick Deployment of Links -Flexibility & Scalability
Define frequency Number of oscillations per second -- Measured in Hertz (Hz)
Impact of wavelength on MW range and deployment Low Frequency = Long Distances --Rural Areas High frequencies = shorter distances -Urban Areas
Distance range of MW Hop Length Up to 150KM
Typical MW Frequency Range 4-80GHz
Define Duplex Frequency Distance between Tx & Rx frequency
Frequency band is divided into... ...lower band and upper band.
What is Channel Width? Typical range? Frequency bandwidth of a channel. Typical range is from 3.5MHz to 1000MHz.
What are the four traffic interfaces? Which are circuit switched networks and which are packet switched networks? PDH (Circuit) SDH/SONET (Circuit) Ethernet (Packet) ATM (Packet)
Define PDH. What is its ANSI & ETSI data standards? Deployment application? PDH = Plesiochronous Digital Hierarchy (1960s) -ETSI (E1) = 2Mbit/s -ANSI (DS1) = 1.5Mbit/s Deployed in lower capacity, short range capacities.
Define SONET and SDH. What is data stream rate and standard of each? Deployment application? SONET = Synchronous Optical NETworking -ANSI Standard 155Mbit/s (OC-3) SDH = Synchronous Digital Hierarchy -ETSI standard 155Mbit/s (STM-1)
Can a single E1 in SDH signal hundreds of E1's? Can a single STM-1 signal multiple STM-1's? Yes and yes!
What is a Hybrid Radio Link? Hybrid Radio Link can carry all traffic as TDM or Ethernet or a mix of the two.
Advantages of MW Deployment -Short time to Market -Quick Roll-Out -Easy to Expand, Modular -Low Investment (invest as you grow) -Low Operational Costs (install and forget) -Application Independent -Software Controlled Functionality
Timeline for MW Technology 1930's - Start of use for MW as a transmission resource (analog signals) 1970 - MW Links produced at Ericsson. In mid 70's, first digital link Mid 1980's - MW Links premiere in cellular networks 1990's - Digital Mobile Networks & TDM's
What percentage of radio base stations worldwide are connected via microwave? 60%
Microwave Mobile Backhaul Applications -Supporting 2G,3G,4G/LTE -High capacity Fiber ring closure -TDM only transport -Hybrid Transport -All Packet Transport
What is MIMO? MIMO - Multiple Input & Multiple Output --Increases MW capacity using multiple transmitters and multiple receivers.
What are the 3 ways to build a microwave system? 1) All Outdoor 2) All Indoor 3) Split Mounting
Unprotected vs Protected Mode Unprotected Mode = Single point of failure can lead to a complete loss of the connection. Protected Mode = System is redundant.
Name the 4 different subnetworks of a MW Transmission Network 1) Radio Network - MW radio communication to carry traffic, synchronization, and management. 2) Traffic Network - Distribution of traffic from "switching site" to "the last site." 3) Management Network - Supe0 4) Synchronization Network
Define the Radio Network MW subnetwork.
Define the Traffic Network MW subnetwork.
Define the Management Network MW subnetwork.
Define the Synchronization Network MW subnetwork. Transport of synchronization signal from the "Switching site" to transmission equipment and radio base stations.
Created by: glarsen117