NENA ENP Study Guide
1. VLF frequency range Very Low Frequencies - 10-30 kHz
2. LF frequency range Low Frequencies - 30-300 kHz
3. MF frequency range Medium Frequencies- 300-3000 kHz
4. HF Frequency Range High Frequency- 3-30 MHz
5. VHF Frequency Range Very High Frequency - 30-300 MHz
6. UHF Frequency Ultrahigh Frequency 300-3000 MHz
Range
7. SHF Frequency Range Super High Frequency 3-30 GHz
8. EHF Frequency Range Extremely High Frequencies 30-300 GHz
9. VHF Low-Band Freq 39-72 MHz
range
10. VHF Low Band Frequencies in this band tend to travel greater distances than those of
a higher frequency, however, there can be interference problems with
atmospheric skip.
11. VHF High Band Frequency band that is typically used by public safety. Preferred by rural
agencies as the signals in this band tend to provide better coverage in
uneaven terrain and wooded areas. 150-170MHz
12. UHF- Ultra High Fre- Frequencies in this band inclide 400, 500, 700, 800 and 900MHz and are
quency typically used by police, fire and ems in day to day operations.
13. Trunked In a _________ radio system, all users share the same radio frequencies.
14. Most conversations Trunked radio systems are efficent use of the spectrum for two basic
are of short duration reasons:
, NENA ENP Study Guide
and not all users need
to access the system
at the same time.
15. 5 watts Portable radios typically transmit___watts.
16. 100 watts Mobile radios may transmit as high as ___watts.
17. Simplex Radio System In this type of radio system, it transmits and recieves on the same frequency.
Does not require any base equipment, but can used with base stations.
Good for short range use. Can be thought of as "walkie-talkie mode". Often
referred to as direct mode
18. Repeater system Allows portable and mobile users to communicate with other users great
distances away. (i.e. 25 miles). Can be large powered base stations with
antenna mounted at least 60 feet in height, or mounted in a vehicle.
19. Repeater system Portable and mobile radios transmit on one frequency, while the base
transmitter, retransmits the signal on another frequency.
20. Talk Around In a repeater system, Simplex channel that uses a base stations transmit
frequency.
21. Satellite or Voted Re- _____ are stragetically placed throughout the coverage area and recieve
ciever the dignal from a portable or mibile with close proximity, then send the
signal, via microwave or landline, to a central controller. The central con-
troller then votes the best audio signaling, and that signal is then passed
to the system and this is what the other radio users hear.
22. Simulcast System System that transmits the message over more than one transmitter on the
same frequency.
23. Analog System that uses the voice's vibration to send the voice to the transmitter.
, NENA ENP Study Guide
24. Digital In this type of system, the voice is converted to a digital signal signal using
a voice coder, or "vocoder".
25. Data signaling Several types of _________ are available on radio systems. Can be as
simple as the radio ID number to short messages, and even remote control
of equipment. (ie. Emergency Buttons).
26. TSP ( telecom- The goal of the ______ is to carry information through a network in the
munications service most efficent way possible, using no more resources than necessary. Gets
provider) the call from point A-B.
27. LATA (Local Access A specific geographic area within which a local TSP may offer either local
and Transport Area) or long distance service.
28. InterLATA Telecommunications services that originate in one LATA and terminate in
another, often considered long distance.
29. Interexchange Carri- Provides services to the public between local exchanges on intra- or inter-
er (IXC or IEC) LATA basis in compliance with Federal regulatory requirements.
30. Local Exchange Refers to the service area provided by an end office.
31. Local Exchange Carri- Provides intraLATA telecommunications within a franchised area.
er (LEC)
32. local loop A connection between a customer premise and a local telephone compa-
ny's central office.
33. Switching The process of connecting the calling party to the called party without the
use of dedicated transport facilities.
34. Central Office (CO) The local service provider building that connects the customers to the
service provider network. Can also refer to a local switching system that
connects lines and trunks.
1. VLF frequency range Very Low Frequencies - 10-30 kHz
2. LF frequency range Low Frequencies - 30-300 kHz
3. MF frequency range Medium Frequencies- 300-3000 kHz
4. HF Frequency Range High Frequency- 3-30 MHz
5. VHF Frequency Range Very High Frequency - 30-300 MHz
6. UHF Frequency Ultrahigh Frequency 300-3000 MHz
Range
7. SHF Frequency Range Super High Frequency 3-30 GHz
8. EHF Frequency Range Extremely High Frequencies 30-300 GHz
9. VHF Low-Band Freq 39-72 MHz
range
10. VHF Low Band Frequencies in this band tend to travel greater distances than those of
a higher frequency, however, there can be interference problems with
atmospheric skip.
11. VHF High Band Frequency band that is typically used by public safety. Preferred by rural
agencies as the signals in this band tend to provide better coverage in
uneaven terrain and wooded areas. 150-170MHz
12. UHF- Ultra High Fre- Frequencies in this band inclide 400, 500, 700, 800 and 900MHz and are
quency typically used by police, fire and ems in day to day operations.
13. Trunked In a _________ radio system, all users share the same radio frequencies.
14. Most conversations Trunked radio systems are efficent use of the spectrum for two basic
are of short duration reasons:
, NENA ENP Study Guide
and not all users need
to access the system
at the same time.
15. 5 watts Portable radios typically transmit___watts.
16. 100 watts Mobile radios may transmit as high as ___watts.
17. Simplex Radio System In this type of radio system, it transmits and recieves on the same frequency.
Does not require any base equipment, but can used with base stations.
Good for short range use. Can be thought of as "walkie-talkie mode". Often
referred to as direct mode
18. Repeater system Allows portable and mobile users to communicate with other users great
distances away. (i.e. 25 miles). Can be large powered base stations with
antenna mounted at least 60 feet in height, or mounted in a vehicle.
19. Repeater system Portable and mobile radios transmit on one frequency, while the base
transmitter, retransmits the signal on another frequency.
20. Talk Around In a repeater system, Simplex channel that uses a base stations transmit
frequency.
21. Satellite or Voted Re- _____ are stragetically placed throughout the coverage area and recieve
ciever the dignal from a portable or mibile with close proximity, then send the
signal, via microwave or landline, to a central controller. The central con-
troller then votes the best audio signaling, and that signal is then passed
to the system and this is what the other radio users hear.
22. Simulcast System System that transmits the message over more than one transmitter on the
same frequency.
23. Analog System that uses the voice's vibration to send the voice to the transmitter.
, NENA ENP Study Guide
24. Digital In this type of system, the voice is converted to a digital signal signal using
a voice coder, or "vocoder".
25. Data signaling Several types of _________ are available on radio systems. Can be as
simple as the radio ID number to short messages, and even remote control
of equipment. (ie. Emergency Buttons).
26. TSP ( telecom- The goal of the ______ is to carry information through a network in the
munications service most efficent way possible, using no more resources than necessary. Gets
provider) the call from point A-B.
27. LATA (Local Access A specific geographic area within which a local TSP may offer either local
and Transport Area) or long distance service.
28. InterLATA Telecommunications services that originate in one LATA and terminate in
another, often considered long distance.
29. Interexchange Carri- Provides services to the public between local exchanges on intra- or inter-
er (IXC or IEC) LATA basis in compliance with Federal regulatory requirements.
30. Local Exchange Refers to the service area provided by an end office.
31. Local Exchange Carri- Provides intraLATA telecommunications within a franchised area.
er (LEC)
32. local loop A connection between a customer premise and a local telephone compa-
ny's central office.
33. Switching The process of connecting the calling party to the called party without the
use of dedicated transport facilities.
34. Central Office (CO) The local service provider building that connects the customers to the
service provider network. Can also refer to a local switching system that
connects lines and trunks.
