CBRS Exam Questions & Answers
PAL - Priority Access License
PPA - PAL Protected Area
SAS - Spectrum Access System
TPA - Training Program Administrator
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 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 are the differences and similarities between Category A and B CBSDs? - Category A:
- only requires CPI installation if the CBSD cannot determine its own location
- Can be used indoors
- Can be used outdoors if it is below the height limit
- Has a transmit power limit of 20 dBm/MHz and 30dBm/10MHz
, Category B:
- Always requires CPI installation
- Cannot be used indoors
- does not have an outdoor height limit
- Has a transmit power limit of 37 dBm/MHz and 47dBm/10MHz
Both:
- Cannot be used on moving objects
- Must communicate with the SAS
What are the main antenna parameters that you should know? - Azimuth, downtilt, gain and
beamwidth
What are the three defined air interfaces and what do they mean? - E_UTRA - LTE Coverage
CAMBIUM_NETWORKS - Proprietary Cambium Waveform
4G_BBW_SAA_1 - IEEE 802.16e
what are the two currently defined measurement capabilities? -
RECIEVED_POWER_WITHOUT_GRANT - CBSD can perform measurements before getting a grant.
RECIEVED_POWER_WITH_GRANT - CBSD can perform measurements while using a current grant.
What are the types of parameters provided to the SAS by the CBSD? - 1. Required
2. Optional
3. REG-Conditional
What does a PAL cover? - a PAL covers a single county with CBRS transmitting devices in it, over a 10
MHz channel.
PAL - Priority Access License
PPA - PAL Protected Area
SAS - Spectrum Access System
TPA - Training Program Administrator
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 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 are the differences and similarities between Category A and B CBSDs? - Category A:
- only requires CPI installation if the CBSD cannot determine its own location
- Can be used indoors
- Can be used outdoors if it is below the height limit
- Has a transmit power limit of 20 dBm/MHz and 30dBm/10MHz
, Category B:
- Always requires CPI installation
- Cannot be used indoors
- does not have an outdoor height limit
- Has a transmit power limit of 37 dBm/MHz and 47dBm/10MHz
Both:
- Cannot be used on moving objects
- Must communicate with the SAS
What are the main antenna parameters that you should know? - Azimuth, downtilt, gain and
beamwidth
What are the three defined air interfaces and what do they mean? - E_UTRA - LTE Coverage
CAMBIUM_NETWORKS - Proprietary Cambium Waveform
4G_BBW_SAA_1 - IEEE 802.16e
what are the two currently defined measurement capabilities? -
RECIEVED_POWER_WITHOUT_GRANT - CBSD can perform measurements before getting a grant.
RECIEVED_POWER_WITH_GRANT - CBSD can perform measurements while using a current grant.
What are the types of parameters provided to the SAS by the CBSD? - 1. Required
2. Optional
3. REG-Conditional
What does a PAL cover? - a PAL covers a single county with CBRS transmitting devices in it, over a 10
MHz channel.
