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NODE CENTER

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Function. NCs serve as an access point for LENs, SENs, RAUs, and system control centers-2 (SCC-2s). Each NC operates as an automatic switching point that receives traffic and routes it to other switches through flood search. The NC site contains two shelters, one for switching and one for operations, four LOS(V)3 multichannel terminals, one local RAU, and a node management facility (NMF). See Figure 3-3.

Connectivity. Most NC traffic is passed between the NC switch and the four LOS(V)3 multichannel radio assemblages. Each LOS(V)3 passes three digital transmission groups (DTGs) multiplexed into one multiplex DTG (MDTG) to the NC switch. The NC switch also can cable directly to two SENs, a RAU, and an SCC-2. In addition to the LOS assemblages, the NC connects to multichannel TACSAT/tropospheric scatter (TROPO) systems, or allied subscribers. Twenty-four local telephones are available for NC personnel.

Node Management. The NMF contains a workstation, an intercom, a DNVT, a digital voice orderwire (DVOW), a mapboard, and workspace. The workstation has a monitor and keyboard, and it communicates with the SCC-2 to update NC/LEN status and to receive operational messages and directives. The NMF does not have a printer. It accesses the operations shelter's printer.

Nomenclature

• SWITCH: AN/TTC-47
  --SWITCHING GROUP: ON/306/TTC-47
  --OPERATIONS GROUP: OL/413/TTC-47
  
• MULTICHANNEL LOS: AN/TRC-190(V)3 (4 ea.)
  
• SHF RADIO: AN/GRC-224 (2 ea.) OPERATIONAL IN NC SW
  
• GENERATORS: PU-751 5kW (5 ea.), PU-753 10kW (2 ea.)
  
• NODE MGT FACILITY: AN/TSQ-154
  
• RAU: AN/TRC-191

Technical Information

• BIT RATE: 1024 kbps
  
• PACKET SWITCH CONNECTIONS: 1 IEEE 802.3 LAN, 2 DIAL UP x.25 HOST
  
• CHANNELS USED: 56 VOICE; 4 PACKET SW; 2 OVERHEAD; 64 TOTAL

Figure 3-3. Typical NC configuration.

The Standard Integrated Command Post System (SICPS) tent is used in conjunction with the NMF to make up the operations center. It contains the basic equipment and charts from the NMF. Figure 3-4 shows a typical operations center layout and Figure 3-5 shows a typical node operations board.

Figure 3-4. Nodal operations.

Figure 3-5. Typical node operations board.

Continue with Chapter 3
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Index