Digital Return Path RF Configuration | Motorola SG 2000 instruction

O p e r a t i o n

5 - 7

4Remove the eight screws that secure the SG2-RPM/C board to the chassis. Remove the SG2-RPM/C board. To assist in removing the SG2-RPM/C board, the handle is cantilevered so that pulling up on the handle extracts the board from the chassis.

5Remove the 5-pin power connector that provided dc power to the SG2-RPM/C board.

6Install the SG2-RPM/S board by reversing the above procedure. Do not re-install the 5-pin power connector as the SG2-RPM/s does not require nor accept it.

Digital Return Path RF Configuration

If you are using a single DS-SG2-DRT/A transmitter, it must be installed in the optical transmitter A position as illustrated in Figure 3-1. A JXP-5A (5 dB) pad is installed in the pad facility at the A transmitter location. A JXP-15A (15 dB) pad must also be installed in the pad facility at the B transmitter location to terminate the signal from the return-path-module combiner board (SG2-RPM/C).

For single return applications, the SG2-LIDB distributes an individual RF signal from the RF chassis to transmitter A. Installing an optional second transmitter (B) provides return redundancy as illustrated in Figure 5-10. Installing a redundant B transmitter also requires that you change the pad at that location to a JXP-5A.

Figure 5-10

DS-SG2-DRT/A redundant return

LID

	TP
Optional
Optional			JXP
transmitter
transmitter
A
A

Transmitter

BJXP

TP

BASE

Status

monitor

SG2-RPM/C

SG2-RPLPF

TP

H

LP filter

Ingress

JXP

L

TP

Bulkhead connector for dc power

SG 2000 Installation and O peration Manual

Image 71

Motorola SG 2000 operation manual Digital Return Path RF Configuration, DS-SG2-DRT/A redundant return

Contents

A R L I N E Special Symbols that Might Appear on the Equipment Contents E r a t i o n Installation Torque Specifications Abbreviations and Acronyms Specification s SG2-LR Tables N t e n t s SG 2000 closed Section SG 2000 open Features include Related Documentation Using this Manual Bold type Document ConventionsIf You Need Help Calling for Repairs Mounting Holes HousingSG 2000 housing dimensions front and side view Port locations Port Locations Gaskets Housing gaskets SG2-PS2 power supply Power Supply Network Monitoring Configuration To suit system requirements the RF chassis cover. notation Forward Path Signal flow diagram E r v i e w SG2-LR Receiver SG2-LR receiver functional diagram Analog return transmitters Analog Return PathAnalog Return Transmitters Model Description JXP SG2 transmitter block diagram Digital return transmitters Digital Return Path DS-SG2-DRT-2X/A Model Description Function Options and AccessoriesOptions and accessories Level Control SG2-FE SG2-SBSG2-PS2 SG2 Optical input versus 750 MHz gain Gain Selection Optical input versus 870 MHz gain 10 illustrates the gain option selection chart for 870 MHz Relative level dB versus 750 MHz slope 77 channels Tilt Selection Relative level dB versus 870 MHz slope 94 channels SG2 870 MHz Slope Chart Analog Channels, 220 MHz Digital Relative level dB versus 870 MHz slope 110 channels SG2 870 MHz Slope Chart Analog Channels, 120 MHz Digital N 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 fitting Installation Mounting bracket-front view Strand Wire Mounting Mounting bracket-rear and side views Center conductor length Coaxial CablesFiber Cables Housing lid and fiber spool tray Fiber spool tray Installation Single Receiver Mode Forward Path RF Configuration Broadband/narrowcast Redundant Receiver ModeBroadband/Narrowcast Mode Redundant receiver Override AB Override Functionality Status monitor/MCB operation Status Monitor/Manual Control Operation Split return Analog Return Path RF ConfigurationRedundant 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 Configuration DS-SG2-DRT-2X/A redundant return DS-SG2-DRT-2X/A split return Removing SG 2000 Optical Modules Installing SG 2000 Optical ModulesSG 2000 Optical Modules SG2 LR Optical Receiver Cleaning the Optical Connector Feature Description 0.3 Test-point voltage versus optical power Wavelength selection jumper Wavelength Selection Jumper SG2 Ifpt Optical Transmitter FeatureDescriptionSG2-IFPT features SG2 FPT Optical Transmitter Transmitter enableSG2-FPT features SG2 Dfbt Optical Transmitter SG2-DFBT features Single red LED that lights if the hybrid current is outside SG2 DFBT/3 Optical Transmitter SG2-DFBT/3 features SG2 Eifpt Optical Transmitter SG2-EIFPT features DS-SG2-DRT/A DS SG2 DRT/A Digital Return Transmitter DS-SG2-DRT/A features Feature DS-SG2-DRT-2X/A DS SG2 DRT 2X/A Digital Return Transmitter DS-SG2-DRT-2X/A features DS-SG2-DRT-2X/A installed in SG DS-SG2-DRT-2X/A cable connector DS-SG2-DRT-2X/A second RF input cable connection SG2-PS Power SupplySG2-PS power supply Parameter Description Status Monitoring Description Function Manual Control Board Through ICS4 Alarm test pointDB test point Potentiometers ICS1 Off Ingress ControlState Description Appendix a Parameter SpecificationTable A-1 SG 2000 optical characteristics Table A-2 Station RF characteristics ParameterSpeci fic ation Parameter Table A-5 SG2-IFPT RF specificationsTable A-6 SG2-FPT RF specifications Table A-8 SG2-DFBT/3 RF specifications Table A-7 SG2-DFBT RF specifications Table A-10 SG2-DRT/A RF specifications Table A-9 SG2-EIFPT RF specifications Table A-11 SG2-DRT-2X/A RF specifications Minimum Optical Model Output Power DBm Option 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 channels Torque Fastener Screw Size Wrench Size In-lbs Ft-lbs MHz DBcDBm DBmV Optical modulation index Return for service authorizationSnap connector National Television Standards Committee Mgbi