Motorola SG 2000 operation manual SG2 DFBT/3 Optical Transmitter, SG2-DFBT/3 features

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O p e r a t i o n

SG2 - DFBT/3 Optical Transmitter

The SG2-DFBT/3 is an isolated distributed feedback (DFB) return path optical transmitter used in the SG 2000 node platform. It has a nominal optical output power of 2.0 mW and is used in conjunction with an AM-RPR, AM-OMNI-RPR/2, or other similar return-path optical receiver.

Figure 5-19 illustrates the SG2-DFBT/3:

Figure 5-19

SG2-DFBT/3

SG2000
Transmitter
LASER	O	F	SG2-DFBT/3
LASER	N	A
CURRENT		U	ASSEM BLED
(1 V/A)		L	IN MEXICO
		T

Table 5-6 provides information on the user-related features of the SG2-DFBT/3:

Table 5-6

SG2-DFBT/3 features

FeatureDescription

Optical power test point This test point enables monitoring of the optical output level of the module. The nominal scale factor is 1.0 V/mW. The optical power test-point voltage is between 0.945 V through 1.055 V (optical power of 0.945 mW through 1.055 mW) when the module is enabled under normal operating conditions. Note that the optical power test point does not track changes in optical power due to the laser tracking error.

Laser current test point This test point enables monitoring of the current drawn by the laser diode. The nominal scale factor is 1.0 V/A. The laser current test point voltage is between 5 mV through 110 mV (laser current of

5 mA through 110 mA) when the module is enabled under normal operating conditions. The laser current is expected to vary widely with changes in temperature, but should always remain between the limits.

Transmitter enable	A green LED that provides visual indication of the transmitter’s
	enable status.
Fault indicator	A single red LED that lights if the hybrid current is outside the
	normal operating range, the laser output power is below normal
	limits, or the laser current is above normal limits. Because the laser
	output requires a short period of time to stabilize, it is acceptable
	for the fault indicator to illuminate during the stabilization interval
	(approximately 2 seconds). Note that the module must be enabled
	for the fault indicator to function.

SG 2000 Installation and O peration Manual

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Contents A R L I N E Special Symbols that Might Appear on the Equipment Contents Installation E r a t i o nSpecification s Torque Specifications Abbreviations and AcronymsSG2-LR Tables N t e n t s Section SG 2000 closedFeatures include SG 2000 openUsing this Manual Related DocumentationIf You Need Help Document ConventionsBold type Calling for Repairs SG 2000 housing dimensions front and side view HousingMounting Holes Port Locations Port locationsHousing gaskets GasketsPower Supply SG2-PS2 power supplyConfiguration Network MonitoringTo suit system requirements the RF chassis cover. notation Signal flow diagram Forward PathE r v i e w SG2-LR receiver functional diagram SG2-LR ReceiverModel Description Analog Return PathAnalog Return Transmitters Analog return transmittersSG2 transmitter block diagram JXPDigital Return Path Digital return transmittersDS-SG2-DRT-2X/A Level Control Options and AccessoriesOptions and accessories Model Description FunctionSG2 SG2-SBSG2-PS2 SG2-FEGain Selection Optical input versus 750 MHz gain10 illustrates the gain option selection chart for 870 MHz Optical input versus 870 MHz gainTilt Selection Relative level dB versus 750 MHz slope 77 channelsSG2 870 MHz Slope Chart Analog Channels, 220 MHz Digital Relative level dB versus 870 MHz slope 94 channelsSG2 870 MHz Slope Chart Analog Channels, 120 MHz Digital Relative level dB versus 870 MHz slope 110 channelsN 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 Service cable connection and compression fitting Splicing FiberInstallation Strand Wire Mounting Mounting bracket-front viewMounting bracket-rear and side views Fiber Cables Coaxial CablesCenter conductor length Housing lid and fiber spool tray Fiber spool tray Installation Forward Path RF Configuration Single Receiver ModeRedundant receiver Redundant Receiver ModeBroadband/Narrowcast Mode Broadband/narrowcastAB Override Functionality OverrideStatus Monitor/Manual Control Operation Status monitor/MCB operationRedundant return Analog Return Path RF ConfigurationSplit return RF chassis and location of the SG2-RPM/C or SG2-RPM/S board Digital Return Path RF Configuration DS-SG2-DRT/A redundant returnDS-SG2-DRT-2X/A split return DS-SG2-DRT-2X/A redundant returnSG 2000 Optical Modules Installing SG 2000 Optical ModulesRemoving SG 2000 Optical Modules Cleaning the Optical Connector SG2 LR Optical ReceiverFeature Description Test-point voltage versus optical power 0.3Wavelength Selection Jumper Wavelength selection jumperSG2-IFPT features FeatureDescriptionSG2 Ifpt Optical Transmitter SG2-FPT features Transmitter enableSG2 FPT Optical Transmitter SG2-DFBT features SG2 Dfbt Optical TransmitterSingle red LED that lights if the hybrid current is outside SG2-DFBT/3 features SG2 DFBT/3 Optical TransmitterSG2-EIFPT features SG2 Eifpt Optical TransmitterDS SG2 DRT/A Digital Return Transmitter DS-SG2-DRT/AFeature DS-SG2-DRT/A featuresDS SG2 DRT 2X/A Digital Return Transmitter DS-SG2-DRT-2X/ADS-SG2-DRT-2X/A features DS-SG2-DRT-2X/A cable connector DS-SG2-DRT-2X/A installed in SGSG2-PS power supply SG2-PS Power SupplyDS-SG2-DRT-2X/A second RF input cable connection Status Monitoring Parameter DescriptionManual Control Board Description FunctionPotentiometers ICS1 Alarm test pointDB test point Through ICS4State Description Ingress ControlOff Table A-2 Station RF characteristics Parameter SpecificationTable A-1 SG 2000 optical characteristics Appendix aParameterSpeci fic ation Table A-6 SG2-FPT RF specifications Table A-5 SG2-IFPT RF specificationsParameter Table A-7 SG2-DFBT RF specifications Table A-8 SG2-DFBT/3 RF specificationsTable A-9 SG2-EIFPT RF specifications Table A-10 SG2-DRT/A RF specificationsMinimum Optical Model Output Power DBm Table A-11 SG2-DRT-2X/A RF specificationsOption Watts ac Amps Power @90V @60V @52V @44V Table A-15 SG2-87 performance, with 94 channels Channels Link Launch SystemTable A-14 SG2-75 performance, with 77 channels Table A-16 SG2-87 performance, with 110 channelsTorque Fastener Screw Size Wrench Size In-lbs Ft-lbs DBmV DBcDBm MHzNational Television Standards Committee Return for service authorizationSnap connector Optical modulation indexMgbi