Comtech EF Data MIDAS 4 System and Design - Manual (Page 10)

System and Design Manual, Revision 2
Preface viii
Advantages .............................................................................................................................................................2–17
3. THEORY OF OPERATION ............................................................................. 3–1
Transmission Technologies .....................................................................................................................................3–1
Frequency Division Multiple Access.........................................................................................................................3–1
Single Channel Per Channel ......................................................................................................................................3–1
TDM/TDMA .............................................................................................................................................................3–1
Aloha Protocol .........................................................................................................................................................3–2
Slotted Aloha ............................................................................................................................................................3–2
MIDAS Control Channels.......................................................................................................................................3–2
Outbound Control Channel........................................................................................................................................3–2
Inbound Control Channel ..........................................................................................................................................3–3
Bandwidth Management .........................................................................................................................................3–3
Bandwidth Allocation................................................................................................................................................3–3
Example.....................................................................................................................................................................3–4
Bandwidth Pools........................................................................................................................................................3–5
Carrier Power ..........................................................................................................................................................3–6
Traffic Channels ......................................................................................................................................................3–6
LinkSync™...............................................................................................................................................................3–7
Automatic Frequency Control ...................................................................................................................................3–7
Uplink Power Control................................................................................................................................................3–8
Circuit Power Management (Option) ........................................................................................................................3–9
Site Level Call Blocking............................................................................................................................................3–9
AUPC Bw Calculation...............................................................................................................................................3–9
Circuit Setup and Termination ............................................................................................................................3–10
Full Duplex Circuits ................................................................................................................................................3–10
Circuit Setup ............................................................................................................................................................3–11
Circuit Termination .................................................................................................................................................3–12
Point-to-Point Simplex Circuits...............................................................................................................................3–14
Point-to-Multipoint Simplex Circuits ......................................................................................................................3–14
Circuit Setup ............................................................................................................................................................3–14
Circuit Termination .................................................................................................................................................3–16
Circuit Priority and Circuit Preemption .............................................................................................................3–16
Performance ...........................................................................................................................................................3–17
Nominal Call Setup Delay .......................................................................................................................................3–17
Network Size ...........................................................................................................................................................3–17