Comtech-ef-data SNM-1001 User Manual

Part Number MN/SNM1001.OM Revision 1SNM-1001Network Control ModemOperation and Maintenance ManualMULTIMEDIA INTEGRATED DIGITAL ACCESS SYSTEM

SNM-1001 Network Control Modem PrefaceRev. 1 ixWarranty PolicyThis Comtech EFData product is warranted against defects in material and workmanshipfor

SNM-1001 Network Control Modem GlossaryRev. 1 g–5ROM Read-Only MemoryRR Receiver ReadyRS Ready to SendRT Receive TimingRTS Request to SendRX Receive (

Glossary SNM-1001 Network Control Modemg–6 Rev. 1Term DefinitionALOHA A satellite access method wherein a remote device transmits data “at will.” Ifan

Rev. 1 i–1IIndex AAC Power, 2–4, 2–8AGC Test Point, 2–4, 2–8AUPC, 5–14BBurst Mode, 1–5, 1–7, 1–9, 4–5, 4–10, 5–8, 5–11CChassis GND, 2–8Clocking Option

Index SNM-1001 Network Control Modemi–2 Rev. 1RReceive Interface Faults, 5–11Remote (J6), 2–6Remote Interface Configuration, 4–10Remote Interface Spec

Preface SNM-1001 Network Control Modemx Rev. 1This page has been intentionally left blank.

Rev. 1 1–11Chapter 1. INTRODUCTIONThis chapter describes the SNM-1001 network control modem, referred to in this manualas “the modem”.1.1 OverviewThe

Introduction SNM-1001 Network Control Modem1–2 Rev. 1Using digital signal processing techniques, it functions as the network control channelmodem for

SNM-1001 Network Control Modem IntroductionRev. 1 1–3 TRANSMITRECEIVETR A NS M I TREC EI VECOM M ONSTO REDPOWER ONTRANSMITTER ONCA RR IE R DE T EC TT

Introduction SNM-1001 Network Control Modem1–4 Rev. 11.2.1 DescriptionThe SNM-1001 is a complete, self-contained unit in a standard 1 Unit (1U) 19”(48

SNM-1001 Network Control Modem IntroductionRev. 1 1–51.4 SpecificationsTable 1-1 and Table 1-2 list the operating specifications of the modem in Burst

Introduction SNM-1001 Network Control Modem1–6 Rev. 1Table 1-2. Continuous Mode SpecificationsGeneral SpecificationsOperating Frequency Range 50 to 1

SNM-1001 Network Control Modem IntroductionRev. 1 1–7Remote Control SpecificationsSerial Interface EIA-232, baud rate is19,200 bit/s.Signals Controlle

Introduction SNM-1001 Network Control Modem1–8 Rev. 1Acquisition performance of the modem is shown in Figure 1-5.Figure 1-5. SNM-1001 Acquisition Per

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-1001 Network Control Modem IntroductionRev. 1 1–9The Bit Error Rate (BER) performance of the modem in Burst mode is shown in Figure 1-6.10-210-110

Introduction SNM-1001 Network Control Modem1–10 Rev. 1This page is intentionally left blank.

Rev. 1 2–12Chapter 2. INSTALLATIONThis chapter contains the following information:• Unpacking• Installation• System options• External connections2.1 U

Installation SNM-1001 Network Control Modem2–2 Rev. 14. Save the packing material for reshipment purposes.5. Inspect the equipment for damage incurred

SNM-1001 Network Control Modem InstallationRev. 1 2–3SN M -1001 N etw orkFigure 2-1. Typical Rack ElevationS N M -1001 N etw ork C ontrol M odem20.10

Installation SNM-1001 Network Control Modem2–4 Rev. 12.3 External Modem ConnectorsConnections between the modem and other equipment are made through

SNM-1001 Network Control Modem InstallationRev. 1 2–52.3.1.1 EIA-422/449 Interface Connector PinoutsThe EIA-422/449 interface is provided on a 37-pin

Installation SNM-1001 Network Control Modem2–6 Rev. 12.3.2 Remote (J6)The remote connector allows the user to interface the Monitor and Control (M&

SNM-1001 Network Control Modem InstallationRev. 1 2–72.3.3 Faults (J7)The fault connector on the modem is used to provide FORM-C contact closures for

Installation SNM-1001 Network Control Modem2–8 Rev. 12.3.5 RX IF Input (CP2)CP2 is the receive IF connector. The input impedance is 50Ω (75Ω optional

ii Rev. 1Customer SupportContact the Comtech EFData Customer Support Department for:• Product support or training• Information on upgrading or returni

Rev. 1 3–13Chapter 3. OPERATIONThis chapter describes the front panel operation and clocking options of the modem.3.1 Front PanelThe front panel of th

Operation SNM-1001 Network Control Modem3–2 Rev. 13.1.1 LED IndicatorGeneral modem status and summary fault information are indicated by 10 LEDs on th

Rev. 1 4–14Chapter 4. THEORY OF OPERATIONThis chapter describes the theory of operation for the various PCBs in the modem.4.1 ModulatorThe modem modul

Theory of Operation SNM-1001 Network Control Modem4–2 Rev. 1Table 4-1. M&C Jumper Settings (AS/4973)ConfigurationJumper PositionRedundant Non-Red

SNM-1001 Network Control Modem Theory of OperationRev. 1 4–34.1.1 SpecificationsModulation Type QPSKDigital Data Rate:QPSK, 1/2 Rate 19.2 kbit/sTest M

Theory of Operation SNM-1001 Network Control Modem4–4 Rev. 1From the encoder, the data signal passes through a set of variable-rate digital Nyquistfil

SNM-1001 Network Control Modem Theory of OperationRev. 1 4–54.2 DemodulatorThe modem demodulator converts a QPSK modulated signal of 50 to 180 MHz to

Theory of Operation SNM-1001 Network Control Modem4–6 Rev. 14.2.1 SpecificationsDigital Data Rate:QPSK, 1/2 Rate 19.2 kbit/sSymbol Rate 19.2 ks/sIF Fr

SNM-1001 Network Control Modem Theory of OperationRev. 1 4–7The result is a filtered, digital representation of the received signal. A Costas loopmain

Theory of Operation SNM-1001 Network Control Modem4–8 Rev. 1MICRO-COMPUTERBUSMICROCOMPUTERINTERFACEVITERBI DECODER INCLUDESCHANNEL BER DETECTIONDESCRA

Rev. 1 iiiTable of ContentsCHAPTER 1. INTRODUCTION...1–11.1 Over

SNM-1001 Network Control Modem Theory of OperationRev. 1 4–9Path memory is 80 states in depth. The path with the maximum metric is designated asthe su

Theory of Operation SNM-1001 Network Control Modem4–10 Rev. 14.3.2 Remote Interface SpecificationRefer to Appendix A for the remote interface specifi

SNM-1001 Network Control Modem Theory of OperationRev. 1 4–11Defaults for Continuous ModeModulator Defaults Demodulator DefaultsData Rate A Data Rate

Theory of Operation SNM-1001 Network Control Modem4–12 Rev. 14.4 Digital InterfacesThe modem interface module is a daughter card that plugs onto the d

SNM-1001 Network Control Modem Theory of OperationRev. 1 4–13A clock phase correction circuit is provided which shifts the clock away from the datatra

Theory of Operation SNM-1001 Network Control Modem4–14 Rev. 1The Request To Send (RTS) lines are hardwired by JP11 to the Clear To Send (CTS)lines on

Rev. 1 5–15Chapter 5. MAINTENANCEThis chapter provides the following information:• System checkout• Modulator faults• Module identification• Software

Maintenance SNM-1001 Network Control Modem5–2 Rev. 15.1.1 Modulator CheckoutA typical output spectrum is shown in Figure 5-1. If the output does not r

SNM-1001 Network Control Modem MaintenanceRev. 1 5–35.1.2 Demodulator CheckoutThe input to the demodulator card must be set within the proper frequenc

Maintenance SNM-1001 Network Control Modem5–4 Rev. 1Figure 5-2. Typical Output Spectrum Noise

Preface SNM-1001 Network Control Modemiv Rev. 1CHAPTER 3. OPERATION...

SNM-1001 Network Control Modem MaintenanceRev. 1 5–5With NoiseWithout NoiseFigure 5-3. Typical Eye Constellations

Maintenance SNM-1001 Network Control Modem5–6 Rev. 15.1.3 Test PointsThe modem does not have accessible test points. When troubleshooting is required

SNM-1001 Network Control Modem MaintenanceRev. 1 5–75.1.3.2 Demod/M&C/Interface Test PointsTP 3 +5V +5VTP 4 GND GroundTP 11 GND GroundTP 12 SD Se

Maintenance SNM-1001 Network Control Modem5–8 Rev. 15.2 Fault IsolationThe modem has been designed so that a qualified technician may isolate fault co

SNM-1001 Network Control Modem MaintenanceRev. 1 5–9FAULT TREESNM-10011111TX INTFBUFFER UNDERFLOW_BUFFER OVERFLOW RX INTF FLTSBUFFER CLOK ACT

Maintenance SNM-1001 Network Control Modem5–10 Rev. 15.2.1 Modulator Faults5.2.1.1 Continuous ModeFault/Alarm Possible Problem and ActionIF SYNTHESIZE

SNM-1001 Network Control Modem MaintenanceRev. 1 5–115.2.2 Demodulator Faults5.2.2.1 Burst ModeFault/Alarm Possible Problem and ActionIF SYNTHESIZER D

Maintenance SNM-1001 Network Control Modem5–12 Rev. 15.2.5 Common Equipment FaultsFault/Alarm Possible Problem and ActionBATTERY/CLOCK M&C batter

SNM-1001 Network Control Modem MaintenanceRev. 1 5–135.3 Module IdentificationThe modem PCBs each have an assembly number marked on the board. The lat

Maintenance SNM-1001 Network Control Modem5–14 Rev. 17.2.1 3060-1J Added rev-emulation for backward-compatible operation. AddedADPCM option, and chang

SNM-1001 Network Control Modem PrefaceRev. 1 v5.4 Software Versions ...

Rev. 1 A–1AAppendix A. REMOTE CONTROL OPERATIONThis appendix describes the remote control operation of the SNM-1001.• Firmware number: FW/4969-1L and

Remote Control Operation SNM-1001 Network Control ModemA–2 Rev. 1A.1 GeneralRemote controls and status information are transferred via an EIA485 (opti

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–3A.2 Message StructureThe ASCII character format used requires 11 bits/character:• 1 s

Remote Control Operation SNM-1001 Network Control ModemA–4 Rev. 1A.2.3 Command/ResponseThe command/response portion of the message contains a variable

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–5A.3 Configuration Commands/ResponsesA.3.1 ModulatorModulatorFrequencyCommand:Response

Remote Control Operation SNM-1001 Network Control ModemA–6 Rev. 1SetModulatorOutputPower LevelCommand:Response:Status:Response:<add/MOP_snn.n'

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–7A.3.2 DemodulatorSet DemodFrequencyCommand:Response:Status:Response:<add/DF_nnn.nn

Remote Control Operation SNM-1001 Network Control ModemA–8 Rev. 1SweepCenterFrequencyCommand:Response:Status:Response:<add/SCF_snnnnn'cr'

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–9A.3.3 InterfaceTransmitClockCommand:Response:Status:Response:<add/TC_xxx'cr&a

Remote Control Operation SNM-1001 Network Control ModemA–10 Rev. 1InterfaceADPCMProgramCommand:Response:Status:Response:<add/ADP_xxx'cr'&

Preface SNM-1001 Network Control Modemvi Rev. 1FiguresFigure 1-1. SNM-1001 Network Control Modem...

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–11ASYNCTransmitOverheadBaud RateCommand:Response:Status:Response:<add/TOBR_nnnnn&ap

Remote Control Operation SNM-1001 Network Control ModemA–12 Rev. 1InterfaceSD SignalCommandCommand:Response:<add/ISSD_xxx'cr'>add/ISSD

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–13A.3.4 SystemTime OfDayCommand:Response:Status:Response:<add/TIME_hh:mmxx'cr&

Remote Control Operation SNM-1001 Network Control ModemA–14 Rev. 1AUPCNominalPower LevelCommand:Response:Status:Response:<add/NOMP_snn.n'cr&ap

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–15A.4 Status Commands/ResponsesA.4.1 ConfigurationModulatorConfigStatusCommand:Respons

Remote Control Operation SNM-1001 Network Control ModemA–16 Rev. 1Modulator/CoderConfigProgramStatusCommand:Response:<add/MCP_'cr'>add

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–17Demodulator ConfigStatusCommand:Response:<add/DCS_'cr'>add/DCS_&apos

Remote Control Operation SNM-1001 Network Control ModemA–18 Rev. 1Demod/DecoderConfigProgramStatusCommand:Response:<add/DCP_'cr'>add/D

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–19InterfaceConfigStatusCommand:Response:<add/ICS_'cr'>add/ICS_'cr

Remote Control Operation SNM-1001 Network Control ModemA–20 Rev. 1AutomaticUplinkPowerControl(AUPC)ConfigStatusCommand:Response:<add/ACS_'cr&a

SNM-1001 Network Control Modem PrefaceRev. 1 viiAbout this ManualThis manual provides installation and operation information for the Adaptive Broadban

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–21CommonEquipmentStatusCommand:Response:<add/CES_'cr'>add/CES_'cr

Remote Control Operation SNM-1001 Network Control ModemA–22 Rev. 1CurrentSweepValueCommand:Response:<add/CSV_'cr'>add/CSV_snnnnn'

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–23Bulk ConsolAnalogStatusCommand:Response:<add/BCAS_'cr'>add/BCAS_p1,p

Remote Control Operation SNM-1001 Network Control ModemA–24 Rev. 1Bulk ConsolStatusCommand:Response:<add/BCS_'cr'>add/BCS_p1,p2,p3, .

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–25Bulk ConsolStatus(Continued)ParameterNumberParameter Name(Command Reference)Descript

Remote Control Operation SNM-1001 Network Control ModemA–26 Rev. 1Bulk ConsolStatus(Continued)ParameterNumberParameter Name(Command Reference)Descript

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–27Bulk ConsolStatus(Continued)ParameterNumberParameter Name(Command Reference)Descript

Remote Control Operation SNM-1001 Network Control ModemA–28 Rev. 1Bulk ConsolStatus(Continued)ParameterNumberParameter Name(Command Reference)Descript

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–29ChangeStatusCommand:Response:<add/CS_'cr'>add/CS_x'cr'&apo

Remote Control Operation SNM-1001 Network Control ModemA–30 Rev. 1Where 'pn' is the last parameter returned.ParameterNumberParameter Name(Co

Preface SNM-1001 Network Control Modemviii Rev. 1Reporting Comments or Suggestions Concerning this ManualComments and suggestions regarding the conten

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–31A.4.2 Error PerformanceRaw BER Command:Response:<add/RBER_'cr'>add/R

Remote Control Operation SNM-1001 Network Control ModemA–32 Rev. 1A.5 Stored FaultsInformation on stored faults is returned when requested. If no stor

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–33CommonEquipmentStoredFaultsCommand:Response:<add/CSF_#'cr'>add/CSF_#

Remote Control Operation SNM-1001 Network Control ModemA–34 Rev. 1Bulk ConsolStatusFaultsCommand:Response:<add/BCSF_'cr'>add/BCSF_abcd

SNM-1001 Network Control Modem Remote Control OperationRev. 1 A–35Character 'h': Interface transmit side faults character 2.Bit 6 = 1 always

Remote Control Operation SNM-1001 Network Control ModemA–36 Rev. 1This page is intentionally left blank.

Rev. 1 g–1GGlossary The following is a list of acronyms and abbreviations that may be found in this manual.Acronym/AbbreviationDefinitionΩOhms16QAM 16

Glossary SNM-1001 Network Control Modemg–2 Rev. 1BTU British Thermal UnitBW Backward Alarm or BandwidthBWR Bandwidth RatioCCelsiusC/N Carrier-to-Noise

SNM-1001 Network Control Modem GlossaryRev. 1 g–3DTE Data Terminal EquipmentE&M Ear and MouthEb/N0Bit Energy-to-Noise RatioECL Emitter Coupled Log

Glossary SNM-1001 Network Control Modemg–4 Rev. 1LSB Least Significant BitLSI Large Scale Integration (semiconductors)mmille (10-3)M&C Monitor and