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It enables operators to reduce backhaul costs by combining multiple traf c types onto a single lower-cost facility and to continue to use legacy interfaces on existing 2G/3G base stations Some microwave equipment manufacturers offer pseudo-wire service in the form of an additional external termination box connected to the microwave radio As IP, MPLS, HFC, and Ethernet are essentially packet-based rather than circuit-oriented transmission technologies, the pseudowire service must emulate the characteristics of circuit-switched connections while utilizing the packet-based infrastructure Pseudo-wire must emulate the transparent nature of circuitswitched connections, both for data and timing, in order to provide compatibility with today s applications, both voice and data, and the customer premise equipment deployed to support them Doing so requires that a number of challenges be met: we must minimize end-to-end latency and ensure QoS, optimize bandwidth utilization, manage jitter and accommodate packet delay variation, maintain clock synchronization between the two endpoints, and maintain time slot ordering and preserve DS0 alignment 20 What is residual BER and what is its importance for the microwave link Very weak signals create many bit errors, and as received signal strength increases, the error rate will fall to a very low level, or error oor This error oor is called the residual bit error rate or residual BER Residual BER measures the combined effect of the digital radio s modulator, transmitter, receiver, and demodulator In essence, it is a single measure of a radio link s hardware quality On the other side, as received power increases, the receiver will ultimately reach an overload point where the error rate again increases quickly 21 What are the consequences of ice buildup on the antenna Ice buildup on antenna elements will result in an increased SWR (impedance mismatch) that will detune a transmitter system, signi cantly reducing its output power Ice can also cause severe transmission line damage, and falling icicles can kill The easiest way to prevent ice buildup is with special antenna heaters or by covering the antenna system with a berglass radome Unfortunately, radomes will increase the wind load on the tower, while antenna heaters can be expensive and affect the antenna radiation pattern
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22 What is the frequency coordination Frequency coordination is a bilateral process that involves the cooperative sharing of technical operating information between parties utilizing the same spectrum In the US, the procedures are based upon the Federal Communications Commission s (FCC) coordination and licensing requirements found in Rule Part 101 (in 1996, the FCC adopted Rule Part 101, which combined the private and common carrier point-to-point frequency bands under one consolidated Rule Part), as well as related industry practices that have evolved over the years The frequency coordination process involves several distinct but interrelated elements: interference analysis, noti cation, and response 23 What is QRSS and is it suf cient to test the T1 circuit Whether public or private, T1 circuits and network equipment must be properly tested and maintained to perform to maximum ef ciency For many T1 transmission systems, the bit error rate tests use the QRSS (quasi-random signal sequence, an imitation of the live traf c) pattern, but it is recommended to use some of the stress test patterns as well Stress patterns will detect B8ZS and AMI mismatch along the T1 circuit, which would not be detected by using just the QRSS test pattern Mixed T1 circuits containing leased lines, ber-optic circuits, and microwave links, and tested end-to-end, should also be tested longterm (over 24 hours) and with the multiple test patterns 24 What is homologation Equipment is very often sold and installed in countries other than country of manufacturing These countries may have different functionality and safety requirements as well as frequency allocations and channeling plans for wireless services (cellular, PCS, microwave, satellite, etc) In order to sell their products in other countries, suppliers must go through a certi cation process (homologation) In many cases, if equipment is approved by the FCC and meets certain minimum requirements, it is considered to be certi ed In some countries, government regulations are used to exclude or delay foreign manufacturers from their markets This is done by requiring suppliers to meet very stringent (and sometimes completely meaningless) requirements and standards and quite often to customize their hardware design While this is not necessarily technically demanding, certi cation and homologation could be a time-consuming process, in some countries taking from a few months to more than a year
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