CBRS CPI Certification question with answers
SAS - -Spectrum Access System
-CBRS - -Citizens Broadband Radio Service
-CPI - -Certified Professional Installer
-FCC - -Federal Communications Commission
-What is the purpose of CBRS? - -CBRS allows a range of RF bandwidth previously
allocated to one licensed user to be shared among many users while maintaining
that low priority users do not interfere with high priority users.
-What RF band does CBRS control? - -3550 MHz - 3700 MHz
-When and by who was CBRS created? - -Created by the FCC in 2015
-What is the CBRS vision? - -150 Mhz of new wireless bandwidth that can be used
for fixed or mobile broadband access.
-What does the SAS do? - -The SAS (Spectrum Access System) monitors all CBRS
clients and receives information from CPI's that allows it to make sure that low
priority users are not interfering with high priority users
-What are the advantages of a shared spectrum? - -Efficiency: lower priority users
are able to use parts of RF spectrum that were previously allocated to a single user
100% of the time even when they weren't being used.
Time To Market: It is very quick and easy for new companies to start using parts of
the CBRS RF spectrum, where it used to take over 10 years to gain possession of
bandwidth.
Cost: It is completely free for a new business to begin using bandwidth, where
companies do have the option to pay for higher priority. Before CBRS it used to cost
billions of dollars to take possession of a range of bandwidth.
-What is an Aggregate Interference Constraint? - -Aggregate Interference
Constraint refers to something that makes sure that interference seen by higher
priority users is kept at a usable and acceptable level.
-Incumbents - -Tier 1 users who were using the CBRS band before the CBRS was
created.
-What kind of architecture does CBRS use and what are the individual parts? - -
CBRS uses a 3-tiered architecture in order to define who has priority over others.
The tiers are:
Tier 1 - Incumbents
Tier 2 - PAL Users
Tier 3 - GAA Users
, -PPA - -PAL Protected Area
-PAL - -Priority Access License
-GAA - -General Authorized Access
-What is the main responsibility of the CPI? - -To make sure that all CBRS
transmitting equipment is correctly registered with the SAS and that all information
being sent to the SAS is accurate.
-What are the 4 main incumbents and what frequency do they operate at? - -
Military ship-borne radar - 3550 to 3650
Military ground based radar - 3550 to 3700
Fixed satellite service earth stations - 3600 to 3700
Wireless broadband services - 3650 to 3700
-What does a PAL cover? - -a PAL covers a single county with CBRS transmitting
devices in it, over a 10 MHz channel.
-What information does the SAS gather from individual devices? - -Location and
Transmitting Information
-CBSD - -CBRS Device
-How does the SAS make sure each device is transmitting without interference? - -
Each CBSD has to contact the SAS in order to obtain permission to transmit. The
SAS uses the information that it gathers from all CBSD's to determine if transmitting
will cause any harmful interference to higher priority users, and grants permission
to transmit once it is sure that no harm will come.
-DP - -Domain Proxy
-What is a domain proxy? - -A domain proxy can be used between CBSDs and the
SAS in order to aggregate multiple CBSD messages or form a bridge between the
SAS and devices that normally would not be able to communicate with the SAS.
-EUD - -End User Device
-Is the SAS a single device? - -The SAS is a paid cloud service that is provided by
multiple different providers known as SAS Administrators
-ESC - -Environmental Sensing Capability
-How does the military take priority of bandwidth and notify the SAS? - -ESC
devices along the coastline notify the SAS when the military is using the spectrum
and the SAS adjusts transmitting information on other devices to account for the
military use.
SAS - -Spectrum Access System
-CBRS - -Citizens Broadband Radio Service
-CPI - -Certified Professional Installer
-FCC - -Federal Communications Commission
-What is the purpose of CBRS? - -CBRS allows a range of RF bandwidth previously
allocated to one licensed user to be shared among many users while maintaining
that low priority users do not interfere with high priority users.
-What RF band does CBRS control? - -3550 MHz - 3700 MHz
-When and by who was CBRS created? - -Created by the FCC in 2015
-What is the CBRS vision? - -150 Mhz of new wireless bandwidth that can be used
for fixed or mobile broadband access.
-What does the SAS do? - -The SAS (Spectrum Access System) monitors all CBRS
clients and receives information from CPI's that allows it to make sure that low
priority users are not interfering with high priority users
-What are the advantages of a shared spectrum? - -Efficiency: lower priority users
are able to use parts of RF spectrum that were previously allocated to a single user
100% of the time even when they weren't being used.
Time To Market: It is very quick and easy for new companies to start using parts of
the CBRS RF spectrum, where it used to take over 10 years to gain possession of
bandwidth.
Cost: It is completely free for a new business to begin using bandwidth, where
companies do have the option to pay for higher priority. Before CBRS it used to cost
billions of dollars to take possession of a range of bandwidth.
-What is an Aggregate Interference Constraint? - -Aggregate Interference
Constraint refers to something that makes sure that interference seen by higher
priority users is kept at a usable and acceptable level.
-Incumbents - -Tier 1 users who were using the CBRS band before the CBRS was
created.
-What kind of architecture does CBRS use and what are the individual parts? - -
CBRS uses a 3-tiered architecture in order to define who has priority over others.
The tiers are:
Tier 1 - Incumbents
Tier 2 - PAL Users
Tier 3 - GAA Users
, -PPA - -PAL Protected Area
-PAL - -Priority Access License
-GAA - -General Authorized Access
-What is the main responsibility of the CPI? - -To make sure that all CBRS
transmitting equipment is correctly registered with the SAS and that all information
being sent to the SAS is accurate.
-What are the 4 main incumbents and what frequency do they operate at? - -
Military ship-borne radar - 3550 to 3650
Military ground based radar - 3550 to 3700
Fixed satellite service earth stations - 3600 to 3700
Wireless broadband services - 3650 to 3700
-What does a PAL cover? - -a PAL covers a single county with CBRS transmitting
devices in it, over a 10 MHz channel.
-What information does the SAS gather from individual devices? - -Location and
Transmitting Information
-CBSD - -CBRS Device
-How does the SAS make sure each device is transmitting without interference? - -
Each CBSD has to contact the SAS in order to obtain permission to transmit. The
SAS uses the information that it gathers from all CBSD's to determine if transmitting
will cause any harmful interference to higher priority users, and grants permission
to transmit once it is sure that no harm will come.
-DP - -Domain Proxy
-What is a domain proxy? - -A domain proxy can be used between CBSDs and the
SAS in order to aggregate multiple CBSD messages or form a bridge between the
SAS and devices that normally would not be able to communicate with the SAS.
-EUD - -End User Device
-Is the SAS a single device? - -The SAS is a paid cloud service that is provided by
multiple different providers known as SAS Administrators
-ESC - -Environmental Sensing Capability
-How does the military take priority of bandwidth and notify the SAS? - -ESC
devices along the coastline notify the SAS when the military is using the spectrum
and the SAS adjusts transmitting information on other devices to account for the
military use.
