Motorola SG 2000 operation manual Manual Control Board, Description Function

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O p e r a t i o n

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Manual Control Board

The SG 2000 manual control board (SG2-MCB) serves to locally control redundancy functions and ingress switch operation if a status monitor is not installed. Figure 3-2 illustrates the MCB board mounted on the main RF board in place of the status monitor. Inputs to the MCB are the received optical power signals from both the A and B receivers, scaled at 1 V/mW.

The MCB board contains two 3-gang, dual-in-line-package (DIP) switches and five screwdriver adjustable potentiometers. Table 5-11 provides descriptions and functions of these user-interface settings:

Table 5-11

MCB user-interface settings

Description

Function

Switch S1-1

Determines whether the primary/redundant reset state occurs at 0.5 dB or

 

1.0 dB more than the defined optical level threshold. This hysteresis or “gap”

 

prevents the automatic switch-over function from “hunting” or switching

 

back and forth if the received optical power remains close to the switching

 

threshold. The factory setting is 1.0 dB.

Switch S1-2

Enables selection of either normal (NORM) or manual override (OVER)

 

operation. In the NORM position, switchover between the primary and

 

secondary optical paths is automatically controlled by the received optical

 

power of the primary receiver. In the OVER position, the selection is

 

performed manually using switch S1-3. The factory setting is NORM.

Switch S1-3

Selects either receiver A (RXA) or receiver B (RXB) as the primary optical

 

receiver when S1-2 is in the NORM position. With S1-2 in the OVER position,

 

S1-3 manually enables either receiver. The factory setting is RXA.

Switch S2-1

Selects standard slaving or cross slaving of the transmitters to the

 

receivers. Set in the standard slaving (STD_SLV ) position, with switch S1-2

 

in the NORM position, transmitter A follows the enable/disable status of

 

receiver A, and transmitter B that of receiver B. Setting S2-1 to cross

 

slaving (CRS_SLV) causes transmitter B to be on when receiver A is

 

enabled and transmitter A to be on when receiver B is enabled. The factory

 

setting is STD_SLV.

Switch S2-2

Controls the status of return transmitter A. If S1-2 is in the OVER position,

 

S2-2 either enables transmitter A (TXA_EN) or disables transmitter A

 

(TXA_DIS). If S1-2 is in the NORM position, then S2-2 enables slaving of the

 

transmitter status to the corresponding receiver (TXA_DIS) or overrides the

 

slaving function enabling the transmitter to be on continuously (TXA_EN).

 

The factory setting is TXA_DIS.

Switch S2-3

Performs the same function for transmitter B as S2-2 performs for

 

transmitter A. The factory setting is TXB_DIS.

Alarm potentiometer

(ALRM) sets the received optical power threshold at which automatic

 

switchover from the primary to the secondary path occurs. It can be set for

 

any power level up to 2.5 mW (+4 dBm). The factory setting is 0.25 V

 

(-3 dBm).

SG 2000 Installation and O peration Manual

Page 90 Page 92
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Page 90 Page 92
Contents A R L I N E Special Symbols that Might Appear on the Equipment Contents E r a t i o n InstallationTorque Specifications Abbreviations and Acronyms Specification sSG2-LR Tables N t e n t s SG 2000 closed SectionSG 2000 open Features includeRelated Documentation Using this ManualIf You Need Help Document ConventionsBold type Calling for Repairs SG 2000 housing dimensions front and side view HousingMounting Holes Port locations Port LocationsGaskets Housing gasketsSG2-PS2 power supply Power SupplyNetwork Monitoring ConfigurationTo suit system requirements the RF chassis cover. notation Forward Path Signal flow diagramE r v i e w SG2-LR Receiver SG2-LR receiver functional diagramAnalog return transmitters Analog Return PathAnalog Return Transmitters Model DescriptionJXP SG2 transmitter block diagramDigital return transmitters Digital Return PathDS-SG2-DRT-2X/A Model Description Function Options and AccessoriesOptions and accessories Level ControlSG2-FE SG2-SBSG2-PS2 SG2Optical input versus 750 MHz gain Gain SelectionOptical input versus 870 MHz gain 10 illustrates the gain option selection chart for 870 MHzRelative level dB versus 750 MHz slope 77 channels Tilt SelectionRelative level dB versus 870 MHz slope 94 channels SG2 870 MHz Slope Chart Analog Channels, 220 MHz DigitalRelative level dB versus 870 MHz slope 110 channels SG2 870 MHz Slope Chart Analog Channels, 120 MHz DigitalN c h S e t u p G u r e 3 2 0 0 0 R F c h a s s i s W e r i n g t h e N o d e Fuse Functi o n Rati ng Ype W e r S u p p l y S e t t i n g s Illustrates the location of the LO-HIjumper Single Power Supply or Commonly Po wered Redundant Supplies I c k C h e c k s F u n c t i o n a l T e s t i n g N u a l G a i n C o n t r o l Analog Retu rn Path R w a r d P a t h P a d d i n g B l e 3 2 0 0 0 p a d c h a r t s t a n d a r d g a i n B l e 3 2 0 0 0 p a d c h a r t h i g h g a i n G u r e 3 N k P e r f o r m a n c e G u r e 3 1 N c h S e t u p Install i n g t h e D S S G 2 D R R B B o a r d O p t i o n G u r e 3 1 S G 2 D R R B b o a r d Install e d G u r e 3 1 C a t i o n o f J X P s o n E p a c k Digital Transmitter Install i n g t h e S t a t u s M o n i t o r O p t i o n 2 0 0 0 a c t i v a t i o n W o r k s h e e t DC powering Splicing Fiber Service cable connection and compression fittingInstallation Mounting bracket-front view Strand Wire MountingMounting bracket-rear and side views Fiber Cables Coaxial CablesCenter conductor length Housing lid and fiber spool tray Fiber spool tray Installation Single Receiver Mode Forward Path RF ConfigurationBroadband/narrowcast Redundant Receiver ModeBroadband/Narrowcast Mode Redundant receiverOverride AB Override FunctionalityStatus monitor/MCB operation Status Monitor/Manual Control OperationRedundant return Analog Return Path RF ConfigurationSplit return RF chassis and location of the SG2-RPM/C or SG2-RPM/S board DS-SG2-DRT/A redundant return Digital Return Path RF ConfigurationDS-SG2-DRT-2X/A redundant return DS-SG2-DRT-2X/A split returnSG 2000 Optical Modules Installing SG 2000 Optical ModulesRemoving SG 2000 Optical Modules SG2 LR Optical Receiver Cleaning the Optical ConnectorFeature Description 0.3 Test-point voltage versus optical powerWavelength selection jumper Wavelength Selection JumperSG2-IFPT features FeatureDescriptionSG2 Ifpt Optical Transmitter SG2-FPT features Transmitter enableSG2 FPT Optical Transmitter SG2 Dfbt Optical Transmitter SG2-DFBT featuresSingle red LED that lights if the hybrid current is outside SG2 DFBT/3 Optical Transmitter SG2-DFBT/3 featuresSG2 Eifpt Optical Transmitter SG2-EIFPT featuresDS-SG2-DRT/A DS SG2 DRT/A Digital Return TransmitterDS-SG2-DRT/A features FeatureDS-SG2-DRT-2X/A DS SG2 DRT 2X/A Digital Return TransmitterDS-SG2-DRT-2X/A features DS-SG2-DRT-2X/A installed in SG DS-SG2-DRT-2X/A cable connectorSG2-PS power supply SG2-PS Power SupplyDS-SG2-DRT-2X/A second RF input cable connection Parameter Description Status MonitoringDescription Function Manual Control BoardThrough ICS4 Alarm test pointDB test point Potentiometers ICS1State Description Ingress ControlOff Appendix a Parameter SpecificationTable A-1 SG 2000 optical characteristics Table A-2 Station RF characteristicsParameterSpeci fic ation Table A-6 SG2-FPT RF specifications Table A-5 SG2-IFPT RF specificationsParameter Table A-8 SG2-DFBT/3 RF specifications Table A-7 SG2-DFBT RF specificationsTable A-10 SG2-DRT/A RF specifications Table A-9 SG2-EIFPT RF specificationsTable A-11 SG2-DRT-2X/A RF specifications Minimum Optical Model Output Power DBmOption Watts ac Amps Power @90V @60V @52V @44V Table A-16 SG2-87 performance, with 110 channels Channels Link Launch SystemTable A-14 SG2-75 performance, with 77 channels Table A-15 SG2-87 performance, with 94 channelsTorque Fastener Screw Size Wrench Size In-lbs Ft-lbs MHz DBcDBm DBmVOptical modulation index Return for service authorizationSnap connector National Television Standards CommitteeMgbi
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