Comtech EF Data CDM-760, Installation And Operation Manual

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Table of Contents Revision 4
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760/CD-CDM760
xv
APPENDIX L. DYNAMIC PREDISTORTION (DPD) OPTION............................................................. L–1
L.1 Overview ............................................................................................................................ L–1
L.1.1 What is Dynamic Predistortion (DPD)? ..................................................................................... L–2
L.1.2 Predistortion ............................................................................................................................. L–3
L.1.3 Crest Factor Reduction (CFR) .................................................................................................... L–5
L.2 DPD – Operational Requirements ........................................................................................ L–6
L.3 DPD – Operational Recommendations ................................................................................. L–7
L.4 DPD Link Design .................................................................................................................. L–7
L.4.1 Commissioning and Deployment .............................................................................................. L–8
L.4.1.1 Local DPD Commissioning and Deployment ..................................................................... L–8
L.4.1.2 Remote DPD Commissioning and Deployment................................................................. L–9
L.4.1.3 Example Results .............................................................................................................. L–10
L.5 DPD – Specifications ......................................................................................................... L–11
L.6 Other Considerations ........................................................................................................ L–12
L.6.1 DPD and DoubleTalk
®
Carrier-in-Carrier
®
................................................................................ L–12
L.6.2 DPD and Adaptive Coding and Modulation (ACM) ................................................................. L–12
L.6.3 DPD and Automatic Uplink Power Control (AUPC) ................................................................. L–12
L.6.4 DPD Latency ............................................................................................................................ L–12
2B
FIGURES
Figure 1-1. CDM-760 Advanced High-Speed Trunking Modem ................................................................ 1–1
Figure 1-2. CDM-760 Dimensional Envelope ............................................................................................ 1–4
Figure 1-3. CDM-760 Front Panel View ..................................................................................................... 1–5
Figure 1-4. CDM-760 Rear Panel View ...................................................................................................... 1–6
Figure 1-5. 70/140 MHz Input Level vs. Symbol Rate ............................................................................. 1–12
Figure 1-6. L-Band Input Level vs. Symbol Rate ...................................................................................... 1–12
Figure 2-1. Unpack and Inspect the Shipment .......................................................................................... 2–1
Figure 2-2. Install the Unit Into a Rack Enclosure ..................................................................................... 2–3
Figure 2-3. Install the Optional Rear Support Brackets Kit ....................................................................... 2–4
Figure 2-4. Install the Optional Bearingless Rack Slide Set ....................................................................... 2–6
Figure 3-1. Coaxial Connector Examples ................................................................................................... 3–1
Figure 3-2. D-Subminiature Connector Examples ..................................................................................... 3–3
Figure 3-3. CDM-760 Cabling Connections ............................................................................................... 3–4
Figure 3-4. Typical SFP Module Installation ............................................................................................ 3–10
Figure 3-5. PIIC Data Interface Slots ....................................................................................................... 3–11
Figure 3-6 Install a PIIC Data Module ...................................................................................................... 3–11
Figure 3-7. Optional High-Speed Packet Processor ................................................................................ 3–12
Figure 3-8. Chassis Ground Interface ...................................................................................................... 3–13
Figure 3-9. AC Power Interface ............................................................................................................... 3–14
Figure 3-10. Apply AC Power to the unit ................................................................................................ 3–14
Figure 3-11. Replace the AC Fuses .......................................................................................................... 3–15