NENA ENP EXAM FULLY SOLVED – COMPLETE EXAM
STUDY GUIDE 2026/2027 WITH VERIFIED
ANSWERS | NEWEST VERSION. A+
Public Safety Land Mobile radio (LMR) is licenced by who?
The Federal Communications Commission (FCC)
In a radio system, voice is converted into what?
Electrical Energy (Waves)
Band
A small section of the spectrum of radio communications frequencies
What is a radio channel?
Pairs of Frequencies
Who assigns radio channels?
The FCC
VHF
30-300 MHz
UHF
300-3000MHz
VHF Low Band
39-72MHz
VHF Low Band
travels greater distances than high frequencies. There may be
interference or atmospheric skip
VHF High Band
,150-170 MHz
VHF High Band
Often used by rural agencies, provide better coverage in uneven terrane
like wooded areas.
The process by which 911 calls/messages are routed to the appropriate
PSAP based on the caller's location information
Default Routing
The capacity to route a 911 call to a designated PSAP when the incoming
911 call cannot be selectively routed due to an ANI failure or other cause.
Alternate Routing
The capability of touring 911 calls to a designated alternate location if all
911 trunks to a primary PSAP are busy or out of service.
Tandem to Tandem
Inter-Selective Router calling is often used to transfer calls between
PSAPS that are served by separate selective routers
Dual Tandems
When a single PSAP is served by two or more separate selective routers
Area Code
Number Plan Area (NPA) is indicated by the first three digits of a 10-digit
phone number
Area Code Split
A solution to provide additional phone numbers by splitting an area code
into two geographically different area codes
Area Code Overlay
,A solution to provide additional phone numbers by offering a new area
code in the same geographic area. This creates the possibility that two
phones in the same room could have two different area codes.
N-1-1 Codes
The FCC administered "service codes" that provide dedicated functions.
Does not override preexisting state or local use
Centralized Automatic Message Accounting (CAMA)
originally designed for automatic toll-call billing systems. This is the basis
for ANI in 911 systems
Computer Telephony Integration (CTI)
puts telephone instrument features on a computer, so user can dial and
control telephone system from a computer screen instead of a traditional
telephone set
Private Branch Exchange (PBX)
a full featured telephone switch interconnecting many telephones
(extensions) in a large enterprise or campus
ANI/ALI Controller
Typically located in the back room or equipment room at the asap site.
Terminates the 911 trunks and decodes ANI information, queries the ALI
database using the ANI and options ALI response. Delivers ANI/ALI
information to the operator equipment at the position that actually
answers the call
ANI Controller
Decodes the CAMA MF signaling arriving on the 911 trunk. It is the
interface to the 911 trunk
ALI Controller
uses ANI to query the ALI database server.
Private Switch ALI (PS/ALI)
, provides the 911 ALI system with information provided by the PBX
operator concerning the location of PBX private line telephones
Full or Partial loss of service to a PSAP
an interruption or break in the communication links causes the full or
partial loss of service to a PSAP as a result of failure in the
communications equipment or the cutting of a telecommunications cable
Loss of a PSAP Facility
Results when the facility housing the PSAP is destroyed or so severely
damaged that the operation of the PSAP is not possible. This can also
result from the threat of such action or from an event that requires
evacuation of personnel from the building
Isolation of Central Office
Occurs when the links between the central office serving a PSAP and the
remainder of the communications network are inturrupted
Isolation of an End Office
Occurs when an end office that feeds the 911 broken system has its
communication links to the tandem or selective router broken
Loss of central office
occurs when the communications equipment located within the central
office fails as a result of malfunction, water damage, fire, etc.
Loss of tandem switch
results in the loss oc call routing and ANI service
Loss of database management system
can result from the failure of any of the computers serving the system;
interruption of cable links between the data systems and ALI nodes; or
damage to the building housing th dbms
Emergency Services IP Network (ESInet)
STUDY GUIDE 2026/2027 WITH VERIFIED
ANSWERS | NEWEST VERSION. A+
Public Safety Land Mobile radio (LMR) is licenced by who?
The Federal Communications Commission (FCC)
In a radio system, voice is converted into what?
Electrical Energy (Waves)
Band
A small section of the spectrum of radio communications frequencies
What is a radio channel?
Pairs of Frequencies
Who assigns radio channels?
The FCC
VHF
30-300 MHz
UHF
300-3000MHz
VHF Low Band
39-72MHz
VHF Low Band
travels greater distances than high frequencies. There may be
interference or atmospheric skip
VHF High Band
,150-170 MHz
VHF High Band
Often used by rural agencies, provide better coverage in uneven terrane
like wooded areas.
The process by which 911 calls/messages are routed to the appropriate
PSAP based on the caller's location information
Default Routing
The capacity to route a 911 call to a designated PSAP when the incoming
911 call cannot be selectively routed due to an ANI failure or other cause.
Alternate Routing
The capability of touring 911 calls to a designated alternate location if all
911 trunks to a primary PSAP are busy or out of service.
Tandem to Tandem
Inter-Selective Router calling is often used to transfer calls between
PSAPS that are served by separate selective routers
Dual Tandems
When a single PSAP is served by two or more separate selective routers
Area Code
Number Plan Area (NPA) is indicated by the first three digits of a 10-digit
phone number
Area Code Split
A solution to provide additional phone numbers by splitting an area code
into two geographically different area codes
Area Code Overlay
,A solution to provide additional phone numbers by offering a new area
code in the same geographic area. This creates the possibility that two
phones in the same room could have two different area codes.
N-1-1 Codes
The FCC administered "service codes" that provide dedicated functions.
Does not override preexisting state or local use
Centralized Automatic Message Accounting (CAMA)
originally designed for automatic toll-call billing systems. This is the basis
for ANI in 911 systems
Computer Telephony Integration (CTI)
puts telephone instrument features on a computer, so user can dial and
control telephone system from a computer screen instead of a traditional
telephone set
Private Branch Exchange (PBX)
a full featured telephone switch interconnecting many telephones
(extensions) in a large enterprise or campus
ANI/ALI Controller
Typically located in the back room or equipment room at the asap site.
Terminates the 911 trunks and decodes ANI information, queries the ALI
database using the ANI and options ALI response. Delivers ANI/ALI
information to the operator equipment at the position that actually
answers the call
ANI Controller
Decodes the CAMA MF signaling arriving on the 911 trunk. It is the
interface to the 911 trunk
ALI Controller
uses ANI to query the ALI database server.
Private Switch ALI (PS/ALI)
, provides the 911 ALI system with information provided by the PBX
operator concerning the location of PBX private line telephones
Full or Partial loss of service to a PSAP
an interruption or break in the communication links causes the full or
partial loss of service to a PSAP as a result of failure in the
communications equipment or the cutting of a telecommunications cable
Loss of a PSAP Facility
Results when the facility housing the PSAP is destroyed or so severely
damaged that the operation of the PSAP is not possible. This can also
result from the threat of such action or from an event that requires
evacuation of personnel from the building
Isolation of Central Office
Occurs when the links between the central office serving a PSAP and the
remainder of the communications network are inturrupted
Isolation of an End Office
Occurs when an end office that feeds the 911 broken system has its
communication links to the tandem or selective router broken
Loss of central office
occurs when the communications equipment located within the central
office fails as a result of malfunction, water damage, fire, etc.
Loss of tandem switch
results in the loss oc call routing and ANI service
Loss of database management system
can result from the failure of any of the computers serving the system;
interruption of cable links between the data systems and ALI nodes; or
damage to the building housing th dbms
Emergency Services IP Network (ESInet)
