Comtech-ef-data SNM-1002 Manuale Utente

Part Number MN/SNM1002.OM Revision 2 SNM-1002LinkSync Modem Operation and Maintenance Manual

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM viii CHAPTER 3. OPERATION...

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–6 MONITOR&CONTROLCONVOLUTIONALENCODERDIGITALSIGNALPROCESSINGBPFBPFREFERE

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–7 4.3.1 Modulator Specifications Refer to Table 4-1 for modulator specifica

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–8 4.3.2 Theory of Operation The modulator is composed of eight basic subsec

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–9 The two identical digital Nyquist filters are followed by Direct Digital

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–10 4.3.3.1 BPSK Encoding The modulator converts transmitted baseband data in

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–11 4.4 Demodulator A block diagram of the demodulator is shown in Figure 4-

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–12 4.4.1 Demodulator Specifications Refer to Table 4-2 for demodulator speci

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–13 4.4.2 Theory of Operation The demodulator functions as an advanced, dig

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–14 implemented digitally. The DDS performs the function of a VCO in an analo

5–1 Chapter 5. MAINTENANCE This chapter provides the following information: • System checkout • Fault isolation • Module replacement and identif

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM ix CHAPTER 4. THEORY OF OPERATION ...

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–2 5.1.1 Interface Checkout Use the following procedure and the test setup in Figure

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–3 5.1.2 Modulator Checkout Use the following procedure to check out the modulator:

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–4 Table 5-1. Conversion to S/N and Eb/N0 Chart (dB) Code Rate 1/2 Code Rate 3/

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–5 ATTEN10dB2.00 dB/DIVRES BANDWIDTH10.0 kHzRL -49.00 dBmCENTER 70.000 MHz*RB10.0kH

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–6 5.1.3 Demodulator Checkout Use the following procedure to test the demodulator. 1

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–7 WITH NOISEWITHOUT NOISE Figure 5-4. Typical Eye Constellations

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–8 5.2 Fault Isolation The modem’s design allows a technician to repair a faulty mode

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–9 Table 5-2. SNM-1002 Fault Tree MODULATOR FAULTS TX IF OUTPUT OFF T

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–10 Table 5-2. SNM-1002 Fault Tree (Continued) TX INTERFACE FAULTS TX I

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–11 Table 5-2. SNM-1002 Fault Tree (Continued) COMMON EQUIP FAULTS TX

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM x Figures Figure 1-1. SNM-1002 ...

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–12 5.2.2 Faults/Alarms Display General fault, status, and alarm information are indi

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–13 5.2.3.1 Modulator Faults Fault/Alarm Possible Problem and Action IF SYNTHESIZE

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–14 5.2.3.2 Demodulator Faults Fault/Alarm Possible Problem and Action CARRIER DETEC

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–15 5.2.3.3 Transmit Interface Faults Fault/Alarm Possible Problem and Action TX

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–16 5.2.3.4 Receive Interface Faults Fault/Alarm Possible Problem and Action BUFFER

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–17 Fault/Alarm Possible Problem and Action BUFFER CLK PLL Buffer clock phase-l

SNM-1002 LinkSync Modem Revision 2 Maintenance MN/SNM1002.OM 5–18 5.2.3.5 Common Equipment Faults Fault/Alarm Possible Problem and Action BATTERY

A–1 Appendix A. REMOTE CONTROL OPERATION This appendix describes the remote control operation of the SNM-1002 LinkSync™. • Firmware number: FW/6535

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–2 A.2 Message Structure The ASCII character format used requires 11 bit

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–3 A.2.3 Command/Response The command/response portion of the message

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM xi About this Manual This manual provides installation and operation information for the

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–4 A.3 Configuration Commands/Responses A.3.1 Modulator Modulator Freque

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–5 Set Modulator Output Power Level Command: Response: Status: Respo

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–6 A.3.2 Demodulator Set Demodulator Frequency Command: Response:

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–7 IF Loopback Command: Response: Status: Response: <add/IFL_xxx&

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–8 A.3.3 Interface Interface Transmit Overhead Type Command: Response:

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–9 Baseband Loopback Command: Response: Status: Response: <add/BBL

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–10 Transmit Data Phase Command: Response: Status: Response: <add/TD

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–11 System Modem Type Command: Response: Status: Response: <add/S

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–12 A.4 Status Commands/Responses Modulator Config. Status Command:

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–13 DENC_xxx'cr' ILT_xxx'cr' ERF_nnnnn.n'cr&a

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM xii Trademarks Products names mentioned in this manual may be trademarks or registered

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–14 MTDP_4_yyy'cr' (Note 10) MTMD_4_yyyyy'cr' (Note

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–15 Demodulator Config. Status Command: Response: <add/DCS_&apos

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–16 ILT_xxx'cr' ERF_nnnnn.n'cr' BC_xxx'cr'

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–17 Notes: 1. Data is only returned if FLEX MUX PCB (Card Slot #1)

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–18 RXDR_xxxxxx'cr' TOBR_nnnnn'cr' (Note 5) TCCL_n&a

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–19 MTIT_7_yyyyy'cr' (Note 7) MTCP_7_yyy'cr' (Note

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–20 13. Data not returned if RX Channel #3 is disabled or set for AUPC.

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–21 Interface Receive Side Status Command: Response: <add/IRXS_&a

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–22 Corrected BER Command: Response: <add/CBER_'cr' >ad

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–23 Interface Read Error Status Command: Response: <add/IRES_&apos

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM xiii Installation The installation and connection to the line supply must be made in com

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–24 Receive Signal Level Status Command: Response: <add/RSL_'cr

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–25 A.5 Stored Faults Information on stored faults is returned when

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–26 Interface Receive Side Stored Faults Command: Response: <add/IR

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–27 Bulk Consol. Analog Status Command: Response: <add/BCAS_&apos

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–28 Parameter Number Parameter Name (Command Reference) Description

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–29 Bulk Consol. Status (continued) Parameter Number Parameter Na

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–30 Bulk Consol. Status (continued) Parameter Number Parameter Name

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–31 Bulk Consol. Status (continued) Parameter Number Parameter Na

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–32 Bulk Consol. Status (continued) Parameter Number Parameter Name

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–33 Bulk Consol. Status (continued) Parameter Number Parameter Na

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM xiv EMC (Electromagnetic Compatibility) In accordance with European Directive 89/336/EE

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–34 Bulk Consol. Status (continued) Parameter Number Parameter Name

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–35 Bulk Consol. Status (continued) Parameter Number Parameter Na

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–36 (Note 13) 140 p139 = n, where 'n' is '0'

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–37 Bulk Consoli-dated Status Faults Command: Response: <add/BCSF

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–38 Character 'g': Interface transmit side faults character 1

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–39 Character 'm': Interface receive side faults character

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–40 Change Status Command: Response: <add/CS_'cr' >add

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–41 Modem Options/ Misc. Information Command: Response: <add/MOI_

SNM-1002 LinkSync Modem Revision 2 Remote Control Operation MN/SNM1002.OM A–42 State Of Product Command: Response: <add/SOP_'cr&apos

METRIC CONVERSIONS Units of Length Unit Centimeter Inch Foot Yard Mile Meter Kilometer Millimeter 1 centimeter — 0.3937 0.03281

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM xv Warranty Policy This Comtech EF Data product is warranted against defects in material

2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 • 333 • 2200 PHONE 480 • 333 • 2161 FAX

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM xvi This page is intentionally left blank.

1–1 Chapter 1. INTRODUCTION This chapter provides an overview of the SNM-1002 LinkSync Modem, referred to in this manual as “the modem” (Figure 1-1)

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–2 1.2 Mode of Operation The SNM-1002 is an integral component of the MIDAS Network

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–3 Figure 1-3. Typical LinkSync Redundancy 1.2.1 Description The modem contains:

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–4 Figure 1-4. Modular Design The front panel of the modem contains all Monitor a

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–5 Refer to Figure 1-5 for a system block diagram. Figure 1-5. Block Diagram 1.

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–6 1.4 Specifications 1.4.1 Summary Specifications Table 1-1 lists a summary of the

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–7 Table 1-1. Summary Specifications (Continued) Remote Control Specification Sign

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–8 1.4.2 Environmental and Physical Table 1-2. Environmental and Physical Paramete

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–9 1.5.1 BER Threshold The modem will have a programmable BER threshold function. T

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–10 1.6 Typical Spectral Occupancy Figure 1-7. Typical Spectral Occupancy

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–11 1.7 Dimensional Envelope Note: All dimensions are in English units (centermeter

Copyright © Comtech EFData, 2000. All rights reserved. Printed in the USA. Comtech EFData, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.22

SNM-1002 LinkSync™ Modem Revision 2 Introduction MN/SNM1002.OM 1–12 This page is intentionally left blank.

2–1 Chapter 2. INSTALLATION This chapter provides unpacking and installation instructions, and a description of external connections information. C

SNM-1002 LinkSync Modem Revision 2 Installation MN/SNM1002.OM 2–2 2.2 Installation The modem arrives fully assembled from the factory. After unpac

SNM-1002 LinkSync Modem Revision 2 Installation MN/SNM1002.OM 2–3 Figure 2-1. Installation of the Mounting Bracket

SNM-1002 LinkSync Modem Revision 2 Installation MN/SNM1002.OM 2–4 2.2.1 Typical Single-Thread Cable Installation Note: Cables may be procured fr

SNM-1002 LinkSync Modem Revision 2 Installation MN/SNM1002.OM 2–5 Item No. Cable Description From To 1 Comtech EF Data Supplied FASTCOM Card

SNM-1002 LinkSync Modem Revision 2 Installation MN/SNM1002.OM 2–6 Figure 2-3. Typical Redundant Wiring Schematic

SNM-1002 LinkSync Modem Revision 2 Installation MN/SNM1002.OM 2–7 2.3 Rear Panel Connections The rear panel connectors provide all necessary ext

SNM-1002 LinkSync Modem Revision 2 Installation MN/SNM1002.OM 2–8 2.3.1 Remote Connector and Pinouts (J6) The remote connector is a 9-pin female

SNM-1002 LinkSync Modem Revision 2 Installation MN/SNM1002.OM 2–9 2.3.5 External Reference (CP3) CP3 is a BNC connector for an external referen

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM ii Network Customer Support The Network Customer Support Plan identifies the steps to be f

SNM-1002 LinkSync Modem Revision 2 Installation MN/SNM1002.OM 2–10 This page is intentionally left blank.

3–1 Chapter 3. OPERATION 3.1 Front Panel Note: Front panel operation of the LinkSync modem is only required for initial installation for setting the

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–2 3.1.1 LED Indicators The 10 LEDs on the front panel indicate: • General modem summ

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–3 3.1.2 Front Panel Keypad The front panel keypad permits local operation of the mode

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–4 3.2 Menu System Use the Main menu in Figure 3-3 as a quick reference for accessing t

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–5 3.3 Front Panel Menu SELECTCONFIGURATIONMONITORFAULTS/ALARMSSTORED FLTS/ALMSUTILITY

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–6 Note: The following menus tree shows the modem functions available for an SNM-1002 L

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–7 3.4.1.1 CONFIGURATION:MODULATOR CONFIGURATION MODULATOR To view the modem’s conf

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–8 3.4.1.1.2 MODULATOR:TX-IF FREQENCY TX-IF FREQUENCY 70.000000 MHz Displays the mod

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–9 3.4.1.1.5 MODULATOR:SCRAMBLER SCRAMBLER ON Displays the scrambler status, either

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.om CustomerMidas Network is functioningproperly?Level One Contact is notifiedAuthorized Fa

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–10 3.4.1.1.7 MODULATOR:CARRIER MODE CARRIER MODE NORMAL-MODULATED Displays the carr

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–11 3.4.1.2 CONFIGURATION:DEMODULATOR CONFIGURATION DEMODULATOR 3.4.1.2.1 DEMODULATOR

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–12 3.4.1.2.3 DEMODULATOR:DESCRAMBLER DESCRAMBLER ON Displays the descrambler status

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–13 3.4.1.2.6 DEMODULATOR:IF LOOP BACK IF LOOP BACK OFF Displays the IF loop back s

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–14 SWEEP RANGE 60000 HZ Displays the overall travel of the sweep width range during

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–15 3.4.1.3 CONFIGURATION:INTERFACE CONFIGURATION INTERFACE 3.4.1.3.1 INTERFACE:TX C

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–16 3.4.1.3.2 INTERFACE:TX CLOCK PHASE TX CLOCK PHASE INVERT Programs the TX cloc

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–17 3.4.1.3.4 INTERFACE:BUFFER CLOCK BUFFER CLOCK RX (SATELLITE) Programs the inter

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–18 3.4.1.3.6 INTERFACE:B-BAND LOOP BACK B-BAND LOOP BACK OFF Programs the modem fo

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–19 3.4.1.3.7 INTERFACE:BUFFER SIZE BUFFER SIZE 0 (BYPASS) Sets the size of the bu

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM iv See the Comtech EF Data website at http://www.comtechefdata.com for contact information

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–20 LOOP TIMING OFF The SCT output will become phase-locked to the RX satellite cloc

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–21 FUNCTION SELECT MONITOR 3.4.2.1 MONITOR:RAW BER RAW BER NO DATA Displays the c

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–22 RECEIVE SIGNAL -60.0 DBM Displays the current receive signal level. Range: -25.

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–23 FUNCTION SELECT FAULTS/ALARMS The Faults/Alarms menu is accessible from the Func

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–24 3.4.3.1 FAULTS AND ALARMS:MODULATOR MODULATOR +-------- IF SYNTHESIZER Modulat

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–25 3.4.3.3 FAULTS AND ALARMS:TX INTERFACE TX INTERFACE --------- TX DROP Not Appli

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–26 3.4.3.4 FAULTS AND ALARMS:RX INTERFACE RX INTERFACE --------- BUFFER UNDERFLOW

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–27 3.4.3.5 FAULTS AND ALARMS:COMMON COMMON --------- BATTERY/CLOCK Battery or cl

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–28 3.4.4 FUNCTION SELECT:STORED FLTS/ALMS FUNCTION SELECT STORED FLTS/ALAMS The mo

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–29 3.4.4.1 STORED FLTS/ALMS:MODULATOR MODULATOR X STORED TIME/DATE (FAULT

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.om Contact the Comtech EF Data Network Test and Field Support for: • System level Network

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–30 TX INTERFACE X STORED TIME/DATE (FAULT LABEL) --------- TX DROP (N

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–31 RX INTERFACE X STORED TIME/DATE (FAULT LABEL) --------- BUFFER UNDERF

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–32 COMMON X STORED TIME/DATE (FAULT LABEL) --------- BATTERY/CLOC

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–33 3.4.5 FUNCTION SELECT:UTILITY FUNCTION SELECT UTILITY The Function Select Utilit

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–34 3.4.5.1 UTILITY:MODULATOR UTILITY MODULATOR 3.4.5.1.1 MODULATOR: ASSIGN TRANSMIT

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–35 3.4.5.1.3 MODULATOR:MODULATOR TYPE MODULATOR TYPE INTELSAT OPEN Transmi

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–36 3.4.5.1.5 MODULATOR:TX BPSK ORDERING TX BPSK ORDERING STANDARD Transmi

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–37 3.4.5.2.1 DEMODULATOR:ASSIGN RECEIVE FILTERS ASSIGN RECEIVE FILTERS R

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–38 Decoder type selection. Select VITERBI or SEQUENTIAL decoder type. Note

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–39 19.200 KSPS Status only. Selects RX Symbol Data rate, with 4.800 to 25

SNM-1002 LinkSync™ Modem Revision 2 Preface MN/SNM1002.OM vi This page is intentionally left blank.

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–40 RS422 Displays the TX interface type RS-232, RS-422, or V.35. 3.4.5.3.4

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–41 T1 FRAMING STRUCTURE: G.704 E1 FRAMING STRUCTURE: G.704

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–42 TX data phase relationship. Use this option to select NORMAL or INVERT f

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–43 3.4.5.4 UTILITY:SYSTEM UTILITY SYSTEM 3.4.5.4.1 SYSTEM:TIME/DATE TIME:

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–44 3.4.5.4.3 SYSTEM:REMOTE ADDRESS REMOTE ADDRESS 1 The current modem addr

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–45 3.4.5.4.6 SYSTEM:YEAR DISPLAY YEAR DISPLAY 2 - DIGIT Selects the displa

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–46 3.4.5.4.9 SYSTEM:SELF TEST SELF TEST AUTO Select OFF, AUTO, or RUN. A

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–47 FPGA FIRWARE FW/NNNNNN-DDR Displays the FPGA module firmware version.

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–48 EXT AGC: MIN PWR 10.0 VOLTS Sets the AGC voltage for a receive signal

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–49 UTILITY MODEM TYPE 3.4.5.5.1 MODEM TYPE:MODEM TYPE MODEM TYPE CUSTOM

vii Table of Contents CHAPTER 1. INTRODUCTION...

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–50 3.4.5.5.2 MODEM TYPE:MODEM EMULATION MODEM EMULATION DISABLED Selects

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–51 Notes: 1. Programming a current version (default) allows all features and options

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–52 3.4.5.5.5 MODEM TYPE:CARD #1 TYPE (NOT INSTALLED) 3.4.5.5.6 MODEM TYPE:CARD #2 TY

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–53 3.4.5.5.10 MODEM TYPE:CONFIGURATION CODE - MODEM CONFIGURATION CODE - MODEM

SNM-1002 LinkSync Modem Revision 2 Operation MN/SNM1002.OM 3–54 Thi

4–1 Chapter 4. THEORY OF OPERATION 4.1 LinkSync™ LinkSync™ is a unique MIDAS feature providing: • Automatic Frequency Control (AFC) • Uplink Power

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–2 The AFC process consists of three steps: 1. Removing the receive offset

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–3 4.1.2 Uplink Power Control Uplink Power Control at the MIDAS Controller

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–4 4.2.1 Theory of Operation The M&C card is composed of the following s

SNM-1002 LinkSync Modem Revision 2 Theory of Operation MN/SNM1002.OM 4–5 The heart of the M&C card is the Dallas 80C310 microcontroller operat