Smartphones and the calls, videos, apps, cloud storage and the countless other uses they provide us are dependent on the quality of the cellular connections in our homes, offices, restaurants, cars and everywhere else we go. These connections are reliant on the cell towers which empower us to do all of these things, and when connections break down due to massive crowds, like those at a sports game, Distributed Antenna Systems (DAS) boost the signals. Ensuring the connection with cell towers and DAS are essential for continuous service, as both serve as foundations of our digital society.
Testing the towers and DAS requires skilled technicians to perform the tower tests. Technicians perform specific tests methods on the cellular data networks, such as PIM testing, cable & antenna analysis and carrier-approved cell fiber tests. Towers also require antenna alignment to direct signals. These tests help the integrity of the signal and quality of the components.
How Do Cell Towers Work?
We rely on cell towers, also known as cell sites, for almost every type of communication in our society. Cell towers transfer information and data through fiber optic cables, in most cases, which lead to the antenna at the tower’s apex. Tower can be separated into two distinct types, with very differing ranges of bandwidths.
- RF Cell Towers
- An RF cell tower is mounted with three antennae, each covering a 120° angle to maximize both signal coverage and communication with other towers. These are the standard cell sites.
- Microwave Cell Towers
- A microwave cell tower concentrates its signal into a single beam and locks on to a very distant tower, which simultaneously is locking on to the first tower, until their signals are synchronized. Data is then shared back and forth. The powerful bandwidth a microwave antenna generates allows for the transfer of data over long distances.
What is a DAS?
A Distributed Antenna System, or DAS, is an array of antenna nodes spread over a defined area to both amplify and aggregate cellular signals. Facility owners choose to replace a single high power antenna with a grouping of low power antennas in order to compensate for blind spots in coverage, distant cell towers or signal-blocking materials. A DAS will also lead to a wider signal bandwidth, which means faster data speeds. To test the connection speed of a DAS, technicians analyze the fiber optic cables that connect each antenna node with the instruments discussed below.
PIM, or passive intermodulation, is a byproduct of loose contact between inconsistent metal surfaces channeling a current, especially cell tower or DAS fiber cables as they transmit data. This conductive contact generates meddlesome PIM signals, which interfere with intentional RF transmissions. PIM analyzers, then, test for PIM by performing distance-to-PIM tests and discovering the source of the network performance failure while verifying the quality copper or fiber cables. See all available equipment…
Cable & Antenna Analysis
Cable and Antenna Analyzers, or Sweepers, measure VSWR / return loss, cable loss, insertion loss and distance-to-fault for copper cables. Commonly, a technician may choose to run a sweeper over the copper cable section of a tower above the long lines of fiber and simply replace the copper section, which can save costs in comparison to renting a PIM analyzer. See all available equipment…
Cell Fiber Testing
Cell fiber test kits are wireless carrier-approved bundles of fiber testing equipment which include OTDRs and other testing devices like visual fault locators, optical power meters and fiber inspection scopes. These all-in-one kits allow technicians to verify fiber cables with instruments approved by carriers like Verizon. See all available equipment…
Intended for use with cell towers, not DAS, antenna alignment tools ensure a tower’s antenna are directed towards the next tower and connected with the network. Carriers like Verizon, AT&T and Sprint require antenna alignment tools to optimize the link reliability of their towers, especially for long-range microwave towers. See all available equipment…
Other Test Equipment
ATEC carries an extensive inventory of cellular network equipment which consists of other equipment used at cell site and for other types of cellular network testing like:
Find out more about Cellular Network equipment.
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