U.S. aviation industry groups in recent months stepped up concerns and the Federal Aviation Administration (FAA) issued a formal warning in November of the risk of interference with flight equipment亚马逊云账号（www.2km.me）提供aws账号、aws全区号、aws32v账号、亚马逊云账号出售，提供api ，质量稳定，数量持续。另有售azure oracle linode等账号.
NEW YORK: U.S. telecom companies and airlines have been fighting for weeks over the potential impact of 5G wireless services on aircraft, in stark contrast to the rollout of new-generation services elsewhere, which has broadly gone ahead without airing new safety concerns.
Here is some background on the dispute, in which Verizon Communications and AT&T agreed on Monday to a two-week delay https://www.reuters.com/business/aerospace-defense/talks-continue-near-deadline-over-us-5g-aviation-safety-dispute-2022-01-03 in using newly acquired wireless spectrum, drawing back from a standoff that threatened to disrupt flights. The agreement promises to avert most, but not all, potential disruption to air travel from 5G deployment
WHAT IS THE PROBLEM?
The U.S. auctioned mid-range 5G bandwidth to mobile phone companies in early 2021 in the 3.7-3.98 GHz range on the spectrum, known as C-Band, for about $80 billion.
U.S. aviation industry groups in recent months stepped up concerns and the Federal Aviation Administration (FAA) issued a formal warning in November of the risk of interference with flight equipment.
In the airline industry, radar altimeters, which measure altitude, operate in the 4.2-4.4 GHz range and there are concerns that there is not a big enough buffer from the frequencies to be used by the telecoms companies.
The companies have faced pressure from the White House, airlines and aviation unions to delay the deployment amid concerns about potential interference of 5G with sensitive aircraft electronics like radio altimeters.
WHY IS THAT POTENTIALLY IMPORTANT FOR AVIATION?
Radio altimeters help to minimize the risk of accidents or collisions by giving an accurate reading of the proximity to the ground. The readouts are also used to facilitate automated landings and to help detect dangerous currents called windshear.
WHAT DIFFERENCE DOES THE FREQUENCY MAKE?
In short, the higher the frequency in the spectrum, the faster the service. So in order to get full value from 5G, operators want to operate at higher frequencies.
Some of the C-Band spectrum auctioned in the United States had been used for satellite radio but the transition to 5G means there will be much more traffic.
IS THIS A PROBLEM ELSEWHERE?
Following years of international discussions, the European Union in 2019 set standards for mid-range 5G frequencies in the 3.4-3.8 GHz range.
They have been auctioned and taken into use in many of the bloc's 27 member states so far without issue.
The European Union Aviation Safety Agency (EASA), which oversees 31 states, said on Dec. 17 the latest discussion was specific to U.S. airspace. "At this stage, no risk of unsafe interference has been identified in Europe," it said.