Types

• Type I
  Motorola Type I
  Motorola Type I Is the original type of Motorola's Trunked radio system; it is based on Fleets and Subfleets. Each system had a certain number of Fleets assigned, and then each Fleet had a certain number of Subfleets and radio IDs. The distribution of Fleets and Subfleets on a Type I system is...
  
  
• Type II
  Motorola Type II
  Motorola Type II refers to the second generation Motorola Trunked radio systems that replaced fleets and subfleets with the concept of talkgroups and individual radio IDs. There are no dependencies on fleetmaps, therefore there are no limitations on how many radio IDs can participate on a...
  
  
• Type IIi Hybrid
  Motorola Type IIi Hybrid
  A Motorola Type IIi Hybrid system is a type of Trunked radio system that mixes "blocks" of Type I Fleets/Subfleets with Type II talkgroups. In some cases, all radios support Type II, but in some cases, Type I radios might be used exclusively in subfleets while the Type IIs are used exclusively in...
  
  
• Type II SmartZone
  Motorola Type II SmartZone
  SmartZone systems are composed of Type II SmartNet systems that are networked together via microwave or land-line data circuits to provide multi-site wide-area communications. Many large public safety and state agencies use SmartZone systems for wide-area communications...
  
  
• Type II SmartZone OmniLink
  Motorola Type II SmartZone OmniLink
  Type II SmartZone OmniLink is a type of Trunked radio system with multiple sites, providing a broad range of robust system features and utilizing a distributed call processing architecture linking up to four multi-site systems together into one seamless network, supporting up to 192 sites...
  
  
• Type II VOC
  Motorola Type II VOC
  The introduction of Motorola Type II SmartZone introduced the IntelliRepeater. An IntelliRepeater, or IR, site is a bare-bones trunked site which has no database of users or talkgroups. It is simply sophisticated software running on a Quantar repeater. It is meant to be controlled by the Zone...
  
  

Motorola Type I and Type II systems achieve the same thing in a slightly different way. One important distinction between these systems is the amount of data transmitted by each radio when the operator pushes the PTT button. A Type I system transmits the radio's ID, its fleet information, and the subfleet information. A Type II system only transmits the radio's ID.

What’s the difference? In Type I systems, each radio in the trunk group individually transmits its own affiliation. In Type II systems the trunk system maintains a database that determines each radio's affiliation.Another difference between the systems is that Type I systems are arranged in a fleet-subfleet hierarchy. For example, it is possible for a city using a Type I system to designate four fleets, each with eight subfleets. The police department, fire department, utilities group, and city administration could each be a separate fleet. The police might decide to further divide its fleet into subfleets, such as dispatch, tactical operations, detectives, north, south, east and west side patrols and supervisors. All the available police radios would then be assigned to one of the police subfleets, letting the police centralize their communications and control the type of users on a single system. Determining the exact fleet-subfleet hierarchy for a particular area is referred to as fleet map programming.

The disadvantage of a Type I system is that the brief burst of data sent when a user transmits must contain the radio's ID, its fleet information, and the subfleet information as well. This is three times the amount of data a Type II system radio sends. Since the data capacity of Type I systems is limited, and the total amount of data increases with each user, Type I systems usually accommodate fewer users than Type II systems. Nevertheless, Type I systems are still in use.

Digital Voice Types

• ASTRO - proprietary VSELP vocoder
  Vocoder
  A vocoder is an analysis/synthesis system, mostly used for speech. In the encoder, the input is passed through a multiband filter, each band is passed through an envelope follower, and the control signals from the envelope followers are communicated to the decoder...
  
   implemention and IMBE
  IMBE
  Improved multi-band excitation is a proprietary vocoder developed by Digital Voice Systems, Inc. .It is the predecessor of their Advanced Multi-Band Excitation .- External links :*...
  
   vocoder
  Vocoder
  A vocoder is an analysis/synthesis system, mostly used for speech. In the encoder, the input is passed through a multiband filter, each band is passed through an envelope follower, and the control signals from the envelope followers are communicated to the decoder...
  
   implementation for APCO-25 Common Air Interface