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RADIO ACCESS UNIT

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Function. The RAU gives each mobile subscriber secure, wireless access to the ACUS. Subscribers within the RAU's 15-kilometer range use their MSRTs to connect to the MSE network through the RAU. The RAU receives the transmissions and passes them to the NC switch. See Figure 3-9.

Nomenclature

• RAU: AN/TRC-191 (1 ea.)
  
• MULTICHANNEL LOS: AN/TRC-190(V)1 (1 ea. IF REMOTED)
  
• GENERATORS: PU-751 5kW (2 ea.)

Technical Information

• BIT RATE: 256 kbps
  
• CHANNELS USED: 8 VOICE; 1 GLU; 1 DSVT; 6 UNUSED; 16 TOTAL

Figure 3-9. Typical RAU configuration.

Deployment. RAUs are used in two configurations. In a local RAU, the RAU assemblage is collocated with the NC and connects to the NC switch by cable. A remote RAU can be up to 40 kilometers away from the NC connected by an LOS(V)1 at the RAU site.

Remote RAU teams deploy alone; consequently, the team must be well briefed on both the friendly maneuver and the enemy situation. RAU teams must understand routes, rally points, casualty evacuation procedures, decontamination data, and early warning (air) procedures. The team chief must maximize use of terrain, vegetation, or buildings for concealment and maintain constant security. RAU teams require constant threat updates and must be quickly moved if necessary. Movement should be planned in detail to prevent fratricide. These same considerations apply to an LOS(V)3 radio when being used as a relay.

Users. A RAU can support customers within a 15- kilometer radius. Each RAU has eight radios that allow eight subscribers to talk simultaneously, although as many as 50 can share the same RAU. Three RF levels (16W, 3W, and .5W) are delivered to the antenna. The RAU selects the lowest working output automatically. Affiliation is the process by which subscribers enter and identify their location within the network. The subscriber affiliation is obtained by keying 8R followed by the three-digit personal code and seven-digit directory number. Successful affiliation results in the subscriber receiving a dial tone and the ability to initiate and receive telephone calls. Once a subscriber initially affiliates into the network with their MSRT, their affiliation is maintained automatically as they move from one RAU's range to another.

BSO's should advise their users, when they are moving from one RAU footprint to another, they will lose their telephone call and must reestablish it.

System planners and managers analyze terrain to select the best RAU location before deployment. Dead spots should be briefed to the unit and subordinate units during the rehearsal for an operation. Additionally, high and low terrain that assist or mask the possible execution of MSRT or FM operations should be highlighted so that the terrain can be used to its maximum advantage.

Careful consideration for density of subscribers and maximum amount of traffic must be used in determining the planning ranges of RAUs.

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