STARLINE® SG 2000 Telecommunications Optical Node Installation and Operation Manual 4 2 6 IN 7
Caution These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical shock, do not perform any servicing other than that contained in the Installation and Troubleshooting Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel. Special Symbols that Might Appear on the Equipment This is a class 1 product that contains a class IIIb laser and is intended for operation in a closed environment with fiber attached.
Contents Section 1 Introduction Using this Manual ..........................................................................................................................................1-3 Related Documentation ..................................................................................................................................1-3 Document Conventions ..................................................................................................................................
ii Contents Quick Checks - Functional Testing .................................................................................................................3-8 Forward Path ......................................................................................................................................... 3-8 Manual Gain Control .......................................................................................................................3-9 Thermal Control, Model TCU ......................
Contents iii SG2-DFBT/3 Optical Transmitter ..................................................................................................................5-18 SG2-EIFPT Optical Transmitter ....................................................................................................................5-19 DS-SG2-DRT/A Digital Return Transmitter ....................................................................................................5-20 DS-SG2-DRT-2X/A Digital Return Transmitter ........
iv Contents Figure 3-6 JP1 common-powered single or redundant power configuration .......................... 3-7 Figure 3-7 JP1 split-powered redundant power supply configuration ................................... 3-7 Figure 3-8 SG2-75 low-gain output-stage pad-effects chart .............................................. 3-14 Figure 3-9 SG2-87 low-gain output-stage pad-effects chart .............................................. 3-15 Figure 3-10 SG2-* link c/n performance, 77 channels ...................
Contents v Figure 5-23 DS-SG2-DRT-2X/A........................................................................................ 5-22 Figure 5-24 DS-SG2-DRT-2X/A........................................................................................ 5-22 Figure 5-25 DS-SG2-DRT-2X/A cable connector ............................................................... 5-24 Figure 5-26 DS-SG2-DRT-2X/A installed in SG 2000 ........................................................
vi Contents Table A-13 Current requirements ...................................................................................... A-7 Table A-14 SG2-75 performance, with 77 channels ............................................................ A-8 Table A-15 SG2-87 performance, with 94 channels ............................................................ A-8 Table A-16 SG2-87 performance, with 110 channels ..........................................................
Se ction 1 Introduction Motorola’s SG 2000 telecommunications optical node performs light wave-to-RF and RF-to-light wave signal conversions in an optical transmission link. This product is designed to support a wide variety of advanced hybrid-fiber/coaxial network topologies. As broadband communication systems continue to evolve, the demand increases for optical links that carry the signal further into the transport system.
1-2 Introduction Figure 1-2 illustrates an open SG 2000 telecommunications optical node: F i g u r e 1- 2 SG 2 0 00 — o p en -20dB -20dB JXP 1 FWD EQ H FWD EQ H PORT 1 PORT 2 L L ON JXP 2 TCU ADU -20dB +24 V DC MDR JX P A DU ON -20dB JXP 1 FTEC OFF VARILO SSER MAN SG2- IS IS JXP 2 IS REFER TO MANUAL FOR FUSE VALUES IS STATUS MONITOR JXP 3 JXP 4 ADU CAUTION: CONTAINS PARTS ANDASSEMBLIES SUSCEPTIBLE TO DAMAGE BY ELECTROSTATIC DISCHARGE ( ESD) FRB ADU RPM/* JXP 3 -20dB RCVR INPU
Introduction ! Optional LIFELINE™ status monitoring ! User-friendly fiber management ! 60/90 volt powering ! Digital return redundancy capability ! Modular plug-in diplex filters and equalizers ! Custom configuration for unique system requirements 1-3 Using this Manual The following sections provide information and instructions to install, configure, and operate the SG 2000: Section 1 Introduction provides a brief description of the product, identifies the information contained in this manual
1-4 Introduction Document Conventions Before you begin to use the SG 2000, familiarize yourself with the stylistic conventions used in this manual: Bold type Indicates text that you must type exactly as it appears or indicates a default value SMALL CAPS Denotes silk screening on the equipment, typically representing front and rearpanel controls, I/O connections and indicators (LEDs).
Introduction 1-5 Calling for Repairs If repair is necessary, call the Motorola Repair Facility at 1-800-642-0442 for a Return for Service Authorization (RSA) number before sending the unit. The RSA number must be prominently displayed on all equipment cartons. The Repair Facility is open from 7 AM to 4 PM Pacific Time, Monday through Friday. When calling from outside the United States, use the appropriate international access code and then call 526-314-1000, extension 3194, to contact the Repair Facility.
Se ction 2 Overview Designed to be flexible, you can configure the SG 2000 with up to three optical receivers, four independent high-level RF outputs, and two return-path optical transmitters. Multiple receiver and transmitter combinations are available to satisfy split-band or redundancy requirements. The forward passband is extended to 870 MHz to increase channel capacity and support advanced interactive services and global applications.
2-2 Overview Port Locations The five housing ports, shown in Figure 2-2, provide connection for coaxial cables. Note that the housing ports are not labeled the same as the ports on the RF chassis. Side-by-side connector fittings are limited to .750 inches at ports 1 and 2 and/or ports 3 and 4. These ports are protected by factory inserted threaded plugs or plastic cap plugs which are discarded when the cable connectors are installed.
Overview 2-3 Gaskets Each housing is equipped with a woven-wire gasket and a silicone-rubber weather gasket between the housing base and lid as shown in Figure 2-3: F i g u r e 2- 3 Hou sin g g a sk et s Weather gasket (silicone rubber) -20dB -20dB JXP 1 FWD EQ FWD EQ H H PORT 1 PORT 2 L L ON JXP 2 TCU ADU -20dB +24 V DC MDR JX P A DU ON -20dB JXP 1 FTEC OFF VARILO SSER MAN SG2- IS IS JXP 2 IS REFER TO MANUAL FOR FUSE VALUES IS STATUS MONITOR JXP 3 JXP 4 ADU CAUTION: CONTAINS
2-4 Overview Power Supply The SG 2000 power supply (SG2-PS2) is located in the housing lid to optimize heat transfer and to balance the thermal load between the base and the lid. For high reliability or redundancy applications, two power supplies can be used. An umbilical cord connects the SG2-PS2 to the lid motherboard (LIDB). A flexible power-distribution design enables you to power the node from any of the four RF ports.
Overview 2-5 Network Monitoring The optional LIFELINE Status Monitoring System (LL-SG2) enables you to monitor the SG 2000 from a headend or a remote location. The transponder consists of a plug-in module mounted on the main RF board. If you do not employ status monitoring and use redundant receivers and/or transmitters, a manual control board (MCB) occupies the same position on the main RF board.
5-80 MHz/108-870 MHz K E M 26 27 28 29 30 31 32 33 DS-SG2-DRT-2x/A-1510c-DFB/SC w/split return DS-SG2-DRT-2x/A-1530c-DFB/SC w/split return DS-SG2-DRT-2x/A-1550c-DFB/SC w/split return DS-SG2-DRT-2x/A-1570c-DFB/SC w/split return DS-SG2-DRT/A-1310-FP/SC DS-SG2-DRT/A-1310-DFB/SC DS-SG2-DRT/A-1550-DFB/SC DS-SG2-DRT/A-1510c-DFB/SC 4 5 6 7 8 9 10 11 SG 2000 Installation and Operation Manual DS-SG2-DRT-2x/A-1530c-DFB/SC w/redundancy split return 19 Bandpass 750 MHz 870 MHz Key 75 87 1 Trunk; 2 Bridger
Overview 2-7 Refer to the current Motorola catalog for option and feature availability. Forward Path The multiple receiver functionality of the platform accommodates split-band and/or redundancy applications. A typical split-band configuration has analog signals in the 52 MHz through 550 MHz band feeding one receiver (C location in Figure 2-6). Digital transmissions or narrowcast signals are carried between 450/550 MHz and 870 MHz on another fiber and processed by the second receiver (A location).
2-8 Overview To assess fiber link status, the optical-power monitor circuit is active at all times (even when the receiver is disabled). An integrated optical bulkhead connector and module link status indicators enhance fiber management and reduce troubleshooting time. The receiver module is fully compatible with the status monitor transponder for remote monitoring of key module and link performance parameters.
Overview 2-9 SG2-LR Receiver The receiver module (SG2-LR) is designed specifically for high performance in the SG 2000. The SG2-LR receiver uses an integrated optical-hybrid photo-detector for improved RF performance over the entire 40 MHz through 870 MHz passband. It is enabled and disabled in response to a signal from the status monitor transponder or manual control board (MCB).
2-10 Overview Analog Return Path Similar to the multiple optical receivers, the dual return-path optical transmitters also have split-return or redundant functionality. In split-return applications two of the four RF return signals are fed to one optical transmitter while the remaining two return signals are fed to the second transmitter. Signal levels are adjusted in each return path using model JXP-* attenuator pads.
Overview 2-11 Figure 2-8 illustrates a functional block diagram of the SG2 transmitter: F i g u r e 2- 8 SG 2 t r an sm it t e r b l o c k d i ag ra m Hybrid current test RF input JXP factory calibration only Thermal compensation Laser diode module Fiber output Optical power test Laser current test Laser bias control SG 2000 Installation and Operation Manual
2-12 Overview Digital Return Path The digital return transmitter series (DS-SG2-DRT*) converts a broadband analog RF return-path signal into digital optical signals with 10-bit resolution. The transmitters used for digital return applications are divided into two families: DS-SG2-DRT/A and DS-SG2-DRT-2X/A. Seven digital return transmitters per family are available to meet the needs of most digital return applications.
Overview 2-13 When configured for redundancy, both return transmitters are normally active and transmit the combined RF return signal simultaneously. In the event of path failure, continuity of service is accomplished at the headend or the receiver site by switching to the alternate or active return fiber. Signal levels are adjusted in each return path using Model JXP-* attenuator pads. Units are shipped with a JXP-5 (5 dB) attenuator pad at the input position of each installed transmitter.
2-14 Overview Level Control The gain of hybrid IC amplifiers varies with temperature. In addition, changes in system channel loading and/or splices in the fiber link can change the level of the received signal. The standard TCU board compensates for anticipated hybrid gain changes by sensing housing temperature and signaling needed changes to the RF attenuator. The ADU board, an optional plug-in module, monitors the amplitude of a selected pilot frequency.
Overview 2-15 Model Description Function SG2-MCB Manual control board This board locally controls the ingress switch and receiver/transmitter A/B redundant switching if the node is not equipped with status monitoring. SG2-SB/* Strand bracket Bracket for hanging a strand mounted node. SG2-PS Power supply Provides the +24 V and +5 V dc supply to the station. It has an extended voltage range and is power-factor corrected.
2-16 Overview Gain Selection Figures 2-9 through 2-13 illustrate SG 2000 gain and tilt selection charts based on frequency and channel load options. To use the gain option selection charts, Figures 2-9 and 2-10, first find the point on the left hand axis that corresponds to the expected optical input power at the node. Move across this horizontal line to the right until it intersects a vertical line corresponding to the desired RF output level.
Overview 2-17 Figure 2-10 illustrates the gain option selection chart for 870 MHz: F i g u r e 2- 10 O p t i ca l in p u t v e r su s 87 0 M Hz ga in 870 MHz Gain Selection 2 Optical input (dBm) 1 0 -1 -2 -3 -4 -5 38 40 42 44 46 48 50 52 Bridger output level (dBmV), 870 MHz equivalent (Trunk output level is 10 dB lower) Lo gain limit, 110 ch Hi gain limit, 110 ch Lo gain limit, 94 ch Hi gain limit, 94 ch Figure 2-10 gives the output level at 870 MHz.
2-18 Overview Tilt Selection To use the tilt selection charts, first determine the system operating bandwidth, either 750 MHz or 870 MHz. Next, determine the desired system channel load either 77, 94, or 110 channels. Use the corresponding bandwidth and channel loading chart to determine the preferred tilt, either low, standard, or high.
Overview 2-19 Figure 2-12 illustrates the tilt selection chart for 870 MHz bandwidth and 94-channel load: F i g u r e 2- 12 Re lat iv e l ev e l d B v e r su s 87 0 M Hz s lop e 9 4 ch ann el s SG2 870 MHz Slope Chart 94 Analog Channels, 220 MHz Digital Relative level, dB 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 50 150 250 350 450 550 650 750 870 Frequency, MHz High Standard Low SG 2000 Installation and Operation Manual
2-20 Overview Figure 2-13 illustrates the tilt selection chart for 870 MHz bandwidth and 110-channel load: F i g u r e 2- 13 Re lat iv e l ev e l d B v e r su s 87 0 M Hz s lop e 1 10 cha nn el s SG2 870 MHz Slope Chart 110 Analog Channels, 120 MHz Digital 14 13 Relative level, dB 12 11 10 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 50 150 250 350 450 Frequency, MHz High Standard Low SG 2000 Installation and Operation Manual 550 650 750 870
Se ct io n 3 Bench Setup Before you install the SG 2000 you must set it up to meet the power and configuration requirements for the node location. Bench set-up and quick check procedures are recommended to ensure proper functioning of all components and simplify field installation. The last two pages of this section provide an SG 2000 activation worksheet for you to record all pertinent setup information.
3-2 Bench Setup Figure 3-2 illustrates the RF chassis with the cover removed indicating the location of major components: Figu r e 3- 2 SG 2 0 00 R F ch as s is Drive unit selector (AUTO/MAN) Gain control (MAN ADJ) Driver hybrid MDR board Forward pad SG2-FE* Output hybrid port 1 Ingress switch or JXP2A Return pad Diplex filter Return pad Diplex filter Ingress switch or JXP2A Output hybrid port 3 Forward pad SG2-FE* Flatness board SG 2000 Installation and Operation Manual Status monitor or MCB ADU or TC
Bench Setup 3-3 Powering the Node You can conveniently power the SG 2000 by applying 60 Vac or 90 Vac to housing port 2. This port is not used for RF purposes. All ports are rated at 15 amperes maximum and are fused with common, blade-type 20-ampere automotive fuses. The 10-ampere fuse protects the dc power supply wiring and can also be used to disconnect ac power from the power supply.
3-4 Bench Setup Table 3-1 identifies and describes the ac fuse options: T able 3- 1 AC f u se s Fuse Function Rating Type F1 This fuse delivers ac power to all ports. It is always required except when power from the ac input (port 2) must be blocked at this location. 20 A, 32 Vdc Auto, plug-in, fast blow F2 This fuse passes ac power to/from port 1. 20 A, 32 Vdc Auto, plug-in, fast blow F3 This fuse passes ac to/from port IN.
Bench Setup 3-5 Figure 3-4 illustrates the RF chassis cover and lid showing the location of the fuses: Figu r e 3- 4 Fus e lo ca t ion s F1 F4 -20dB -20dB JXP 1 FWD EQ H FWD EQ H PORT 1 PORT 2 L L ON JXP 2 F3 TCU ADU -20dB +24 V DC MDR JX P A DU ON OFF VARILO SSER MAN SG2IS IS F7 JXP 2 IS REFER TO MANUAL FOR FUSE VALUES IS STATUS MONITOR JXP 3 JXP 4 ADU F2 F5 -20dB JXP 1 FTEC CAUTION: CONTAINS PARTS ANDASSEMBLIES SUSCEPTIBLETO DAMAGEBY ELECTROSTATIC DISCHARGE( ESD) F6 FRB
3-6 Bench Setup Note that no damage results if the jumper is not changed. In a 90 Vac system, changing the jumper ensures that the dc supply does not turn on until the proper input voltage level is reached. This prevents excessive loading of the cable plant power supply during turn-on after a power-off situation.
Bench Setup 3-7 Single Power Supply or Commonly Powered Redundant Supplies To activate a single power supply or commonly powered redundant supplies, place jumper JP1 (illustrated in Figure 3-1) on the SG2-LIDB in the vertical position (strand-mount installation). Figure 3-6 illustrates this position. Power supplies #1 and #2 are both connected to the primary ac power feed.
3-8 Bench Setup Quick Checks - Functional Testing It is recommended that you perform the procedures presented in the following subsections before you place the SG 2000 in service. Forward Path Figure 3-1 illustrates the location of the forward-path receiver modules. To set up the forward-path receivers: 1 Confirm the receiver configuration required. For a single receiver configuration use position C. For redundant receivers use optical receiver A and B positions.
Bench Setup 3-9 9 Remeasure the output level. It should be within 1 dB of the preferred level. If necessary, adjust the manual gain control. Check the remaining ports and add JXP pads to bring the outputs to the correct level. 10 Set the gain reserves using one of the following gain control options. Adjust the selected gain control option using the procedure presented in the appropriate subsection below.
3-10 Bench Setup Analog Return Path Figure 3-1 illustrates the location of the return-path transmitter modules. To set up analog return-path transmitters: 1 Confirm the transmitter configuration required. For a single transmitter, use the optical transmitter A position. The redundant transmitter uses the optical transmitter B position. Redundancy options are discussed in Section 5, “Operation.
Bench Setup 3-11 Forward Path Padding The pad values, presented in Table 3-2 or Table 3-3, serve as a starting-point reference for typical installations. While this chart is prepared specifically for 77 channel loading and the low-gain option, the difference for 110 channel loading is approximately 1 to 2 dB less. It may be necessary to select a JXP value 1 dB or 2 dB lower for the receiver output (amplifier input) pad than shown in Tables 3-2 or 3-3.
3-12 Bench Setup T able 3- 2 SG 2 0 00 p ad ch a rt - st and a rd ga in Input dBm/mW 38 39 40 41 42 43 Output dBmV 44 45 46 47 48 49 50 51 52 2.0/1.6 Receiver JXPs Common JXP Output JXPs 3 12 6 3 12 5 3 12 4 3 12 3 3 12 2 3 12 1 3 12 0 3 11 0 3 10 0 3 9 0 3 8 0 3 7 0 3 6 0 3 5 0 3 4 0 1.5/1.4 Receiver JXPs Common JXP Output JXPs 3 11 6 3 11 5 3 11 4 3 11 3 3 11 2 3 11 1 3 11 0 3 10 0 3 9 0 3 8 0 3 7 0 3 6 0 3 5 0 3 4 0 3 3 0 1.0/1.
Bench Setup 3-13 T able 3- 3 SG 2 0 00 p ad ch a rt - h i gh g ai n Input dBm/mW Output dBmV 44 45 46 38 39 40 41 42 43 47 48 49 50 51 52 Receiver JXPs Common JXP Output JXPs NR NR NR NR NR NR NR NR NR NR NR NR NR NR NR Receiver JXPs Common JXP Output JXPs NR NR NR NR NR NR NR NR NR NR NR NR NR NR 3 9 0 Receiver JXPs Common JXP Output JXPs NR NR NR NR NR NR NR NR NR NR NR NR NR 3 9 0 3 8 0 Receiver JXPs Common JXP Output JXPs NR NR NR NR N
3-14 Bench Setup Launch Amplifier Output Stage Padding By definition the launch amplifier is everything between the optical receiver RF output and the node output connector. The launch amplifier output-stage pad-effects charts show the tradeoff, over a range of output levels, between composite triple beat (CTB) and carrier-to-noise ratio (c/n) when pads are inserted ahead of the individual output hybrids.
Bench Setup 3-15 80.00 -80.00 75.00 -75.00 70.00 -70.00 65.00 -65.00 60.00 -60.00 55.00 -55.00 50.00 -50.00 45.00 -45.00 40.00 CTB, dBc CNR, dB Figu r e 3- 9 SG 2- 87 low - g ain out p ut - st ag e pad - ef f e ct s ch art CNR-10 CNR-6 CNR-3 CNR-0 CTB-0 CTB-3 CTB-6 CTB-10 -40.00 38 39 40 41 42 43 44 45 46 47 48 49 50 Output Level (Highest Analog), dBmV - 11.
3-16 Bench Setup 57 -66 56 -65.5 55 -65 54 -64.5 53 -64 52 -63.5 51 -63 50 -62.5 49 -62 48 -61.
Bench Setup 3-17 55 -65 54 -64.5 53 -64 52 -63.5 51 -63 50 -62.5 49 -62 48 -61.5 47 -61 46 -60.
3-18 Bench Setup Installing the DS-SG2-DRRB Board Option The SG2 Digital Return Redundancy Board (DS-SG2-DRRB) is a fixed plug-in that only provides the capability for RF redundancy to the input of the (DS-SG2-DRT-2X/A). This boards offers full digital return path redundancy when installed in the SG2 fiber optic node.
Bench Setup 3-19 Figu r e 3- 13 DS -S G2- DR RB bo a rd ins t a ll ed SG2-DRT-2X/A (”B” location) SG2-DRT-2X/A (”A” location) Push handle DS-SG2-DRRB board Push handle 4 Insert the MCX connector terminating cable J1 into RF INPUT B on DS-SG2-DRT-2X/A in the transmitter A location. 5 Insert the MCX connector terminating cable J2 into RF INPUT B on DS-SG2-DRT-2X/A in the transmitter B location.
3-20 Bench Setup Figu r e 3- 14 L o c at i on of J X Ps on E- p a ck Replace 0 dB JXP with 1 dB JXP Replace 0 dB JXP with 1 dB JXP SG 2000 Installation and Operation Manual
Bench Setup 3-21 Figure 3-15 illustrates a complete SG2 lid with the DS-SG2-DRRB board (shaded gray) installed: Figu r e 3- 15 SG 2 lid conf igu r ed w it h t he D S- SG 2- DR RB bo ar d RF INPUT B DANGER DS-SG2-DRRB board SG2000 INPUT A Digital Transmitter STAT US DS- SG2-DRT-2X/A 1310 DFB INPUT B J1 RF INPUT B DANGER J2 SG2000 INPUT A Digital Transmitter STAT US DS- SG2-DRT-2X/A 1310 DFB INPUT B When signals are applied to port in and port 1, they are routed directly to the transmitter
3-22 Bench Setup Installing the Status Monitor Option The model LL-SG2-*/* transponder is available as part of the LIFELINE status-monitoring system. The LL-SG2-*/* transponder continuously monitors node parameters, executes commands, and reports to the polling computer when interrogated. Section 2, “Overview,” provides additional information regarding status-monitoring functions.
Bench Setup 3-23 SG 2000 Activation Worksheet This worksheet is provided as a convenient reference to log pertinent information associated with setting up the SG 2000 node.
3-24 Bench Setup DC powering Is the suitcase jumper on the power pack(s) in the correct position? _____60 V (lo) _____90 V (hi) Is the round, green LED on the main board illuminated? _____ yes _____ no Are the two rectangular green LEDs on each power pack illuminated? _____ 24 Vdc _____ 5 Vdc Voltage reading at 24 Vdc test point? _____ Vdc Voltage reading at 5 Vdc test point? _____ Vdc SG 2000 Installation and Operation Manual
Se ction 4 Installation Installation consists of splicing the six-fiber service cable to the transportation fiber, installing the housing and electronics on the messenger strand, applying power, and placing the unit in service. To avoid excess weight and the possibility of damage during installation, the housing is normally mounted prior to inclusion of the electronic components.
4-2 3 Installation Assemble the splice enclosure following the instructions furnished with the enclosure. CA UT ION! It is important that the connections at the headend be duplicated. If they are different from the above recommendations, follow the scheme used for the headend connections. 4 Complete the splicing and installation of the splice enclosure. Suspend the extra cable from the messenger using locally accepted methods.
Installation 4-3 Strand Wire Mounting Two strand clamps and bolt assemblies are located on a bracket attached to the top of the housing for normal horizontal mounting below the strand.
4-4 Installation F i g u r e 4- 3 M ounting b r ac k et- re a r an d sid e v iew s 6 2 4 7 8 1 5 2 4 1 3 IN OUT 3 To mount the housing to the strand wire: 1 Attach the bracket to the housing using the two 5/16 × 18 bolts. 2 Loosen the 3/8 × 16 strand clamp bolt located on each mounting bracket. 3 Engage the strand in the housing strand clamps. Do not tighten the hex-head bolts at this time.
Installation 4-5 Figure 4-4 illustrates the dimensions of the center conductor: F i g u r e 4- 4 Cen t e r co n d u ct o r l en g t h 1.65"Max. 1.50" Min. There are no surge protectors over the center seizure screws and none should be installed. Adding surge protectors degrades the return loss of the housing port. Coaxial Cables To install coaxial cables in the base: 1 Loosen, but do not remove, the three bolts on top of the housing and the bolt on each side of the housing.
4-6 3 Installation Carefully dress the excess fiber into the ramp of the fiber spool tray. Wrap the fiber around the spooling cylinder one to two times depending on the length of the fiber. The diameter of the spool tray is matched to the bend radius of the fiber. Also ensure that the fiber is routed under the retaining flanges and through the pegs of the fiber tray for proper routing to the optics modules.
Installation 4-7 4 Connect each fiber by removing the protective boot from the fiber connector, cleaning the connector with pure isopropyl alcohol (99%) using a lint-free wipe, and drying it with filtered compressed air. After cleaning the fiber, insert it into the appropriate receiver or transmitter module. 5 Position the fiber service cable in the compression fitting to provide some slack in the fibers inside the housing. Tighten the compression nut until it bottoms out.
Se ction 5 Operation This section provides information concerning the use of various options and applications required by your system. It may be helpful to refer to Figures 3-1 and 3-2 that illustrate the major components in the SG 2000 lid and RF chassis. Forward Path RF Configuration You can configure the SG2-lid motherboard (LIDB) using three different forward path RF options. Single Receiver Mode If you are using a single optical receiver module (SG2-LR) it must be installed in position C.
5-2 Operation Redundant Receiver Mode Operation in the redundant mode requires the installation of two optical receivers, one in position A and the other in position B. An SG2-ABJ/P jumper board must be plugged into the lid motherboard. Figure 3-1 illustrates the location of this jumper board.
Operation 5-3 AB Override Functionality The AB override switch (jumper JP2, illustrated in Figure 3-1) can be operated in three different positions.
5-4 Operation A Override The SG2-LIDB overrides the status monitor or manual control board signal and activates receiver A as illustrated in Figure 5-5: F i g u r e 5- 5 A o v er r id e +5V JP2 Status monitor signal Receiver enable logic Status Monitor/Manual Control Operation The SG2-LIDB enables the status monitor or manual control board to activate receiver A or receiver B as illustrated in Figure 5-6: F i g u r e 5- 6 St at u s mo n it o r/M CB op e r at io n +5V JP2 Status monitor signal SG 20
Operation 5-5 Analog Return Path RF Configuration If you are using a single optical transmitter, it must be installed in the optical transmitter A position as illustrated in Figure 3-1. 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.
5-6 Operation For upgrading to split return operation, with DS-SG2-DRT-2X/A transmitters installed in positions A and B, the SG2-RPM/C board must be replaced with an SG2-RPM/S board. The main RF chassis must be removed to perform this exchange.
Operation 5-7 4 Remove 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. 5 Remove the 5-pin power connector that provided dc power to the SG2-RPM/C board. 6 Install 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.
5-8 Operation If you are using a single DS-SG2-DRT-2X/A transmitter, it must be installed in the optical transmitter A position. A JXP-5A (5 dB) pad must be installed in the pad facility at the input of both the A and B transmitter locations. With this transmitter, the SG2 is configured with the return path module/split (SG2-RPM/S).
Operation 5-9 SG 2000 Optical Modules The optical modules available for the SG 2000 include: ! SG2-LR — forward path optical receiver ! SG2-EIFPT — isolated Fabry-Perot return transmitter ! SG2-IFPT — isolated Fabry-Perot return transmitter ! SG2-FPT — non-isolated Fabry-Perot return transmitter ! SG2-DFBT and SG2-DFBT/3 — isolated DFB return transmitters ! DS-SG2-DRT/A and DS-SG2-DRT-2X/A — digital return transmitters Designed specifically for use in the SG 2000 node platform, the modules com
5-10 Operation Cleaning the Optical Connector The design of the SG 2000 optical module connector enables you to clean it easily without removing the module from the node. To clean the connector: 1 If necessary, disconnect the service cable from the modules’ optical-connector assembly. Place a dust cover on the service cable connector. 2 Lift the metal tab to release the optical-connector assembly and pull it out of the module.
Operation 5-11 Tables 5-1 and 5-2 provide additional information on the user-related features and output levels of the SG2-LR: T able 5- 1 SG 2- L R f e at u re s Feature Description Optical power test point This test point enables monitoring of the optical power level at the input to the module. The nominal scale factor is 1.0 V/mW. Hybrid current test point This test point enables monitoring the current drawn by the amplifier section of the integrated optical receiver hybrid.
5-12 Operation Optical input l e ve l ( d B m / m W ) TP Volts (1 mW=1 V) Output (dBmV) 77 channels Output (dBmV) 110 channels Comments –2.0/0.6 0.6 21 19 Normal –2.5/0.6 0.6 20 18 Normal –3.0/0.5 0.5 19 17 Normal –3.5/0.5 0.5 18 16 Normal –4.0/0.4 0.4 17 16 Normal –5.2/0.3 0.3 15 13 High level alarm Typical output levels are approximately 2 dB greater than the minimum levels. Optical modulation index (OMI) for 77 channels (per channel): 0.0403.
Operation 5-13 Wavelength Selection Jumper The SG2-LR can be used with either 1310 nm or 1550 nm transmitters. An internal wavelength selection jumper optimizes the optical power test point and optical power status indicator calibration for the system wavelength. Note that the jumper has no effect on the optical-to-RF performance (gain, flatness, slope) of the module. The wavelength selection jumper is factory-set and provides optimum calibration in a 1310 nm system.
5-14 7 Operation To verify the position of the optical connector assembly, lift the metal tab and attempt to remove the optical connector assembly from the module casting. The connector assembly should slide out easily. If not, remove the sheet metal cover and verify the position of the optical connector assembly. Release the metal tab and snap the optical connector assembly back into place. CA UT ION! Do not pull the optical connector out more than two inches from the casting wall.
Operation 5-15 Feature Description Transmitter enable A green LED that provides visual indication of the transmitter’s enable status. Fault indicator A single red LED that lights when 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.
5-16 Operation Feature Description Transmitter enable A green LED that provides visual indication of the transmitter’s enable status. Fault indicator A single red LED that lights when 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.
Operation 5-17 Feature Description 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.
5-18 Operation 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.
Operation 5-19 SG2-EIFPT Optical Transmitter The SG2-EIFPT is an enhanced, isolated, Fabry-Perot return-path optical transmitter designed for use in the SG 2000 node platform. It has a nominal optical output power of 1 mW and can be used in conjunction with an AM-RPR, AM-OMNI-RPR/2, or other similar return path optical receiver.
5-20 Operation DS-SG2-DRT/A Digital Return Transmitter The DS-SG2-DRT/A is an SG2 return transmitter that digitizes a single analog 5 MHz-42 MHz return-path signal to produce a 1.6 Gbps data stream. This data stream is then routed to a digital laser for transmission to a corresponding digital return receiver. The transmitter can be configured with a digital laser wavelength that is applicable to the required link length.
Operation 5-21 Table 5-8 provides information on the user-related features of the DS-SG2-DRT/A transmitters: T able 5- 8 DS -S G2- DRT / A f e atu r es Feature Description Test point A This test point enables monitoring of the RF level at the input to the A/D. It measures −20 dB from the A/D input level. Input A The transmitter has a digitally controlled attenuator that adjusts for varying input levels.
5-22 Operation DS-SG2-DRT-2X/A Digital Return Transmitter The DS-SG2-DRT-2X/A is an SG2 return transmitter that digitizes two independent analog 5 MHz-42 MHz return-path signals to produce two 1.25 Gbps data streams. These two data streams are then multiplexed to create a 2.5 Gbps data stream. This data stream is then routed to a digital laser for transmission to a corresponding digital return receiver.
Operation 5-23 Table 5-9 provides information on the user-related features of the DS-SG2-DRT-2X/A: T able 5- 9 DS -S G2- DRT -2 X / A f e atu re s Feature Description Test point A and B These test points enable monitoring of the RF level at the input to the A/D. It measures −20 dB from the A/D input level. Input A and B The transmitter has a digitally controlled attenuator that adjusts for varying input levels.
5-24 Operation Figure 5-25 illustrates the DS-SG2-DRT-2X/A cable connector: F i g u r e 5- 25 D S - S G 2- D R T - 2 X / A c a bl e co n n e ct o r Figure 5-26 illustrates the DS-SG2-DRT-2X/A installed in the SG 2000 with completed fiber connections: RF INPUT B SG 2000 Installation and Operation Manual DANGER F i g u r e 5- 26 DS - S G 2- DRT - 2 X / A i n st a ll ed i n SG 2 0 00 SG2000 INPUT A Digital Transmit ter STATUS DS-SG2-DRT-2X/A 1310 DFB INPUT B
Operation 5-25 Figure 5-27 provides greater detail of the DS-SG2-DRT-2X/A second RF input cable connection to the LIDB. This cable connects the other half of the split return to the DS-SG2-DRT-2X/A. F i g u r e 5- 27 D S - S G 2- D R T - 2 X / A s e co n d R F i n p u t ca b l e co n n e ct i o n Transmitter to node service cable Second RF input cable SG2-PS Power Supply The DS-SG2-DRT-2X/A requires the SG2-PS power supply rather than the SG2-PS2 power supply.
5-26 Operation Status Monitoring Table 5-10 identifies and describes the status monitor provisions built into the SG 2000 platform: T able 5- 1 0 Rep or t in g an d c o n t ro l p ro v i s io n s Parameter Description Power supply voltage Converts the +24 V and +5 V outputs from power supply #1 and #2 to a scaled dc voltage that is referenced to ground. Power supply presence A digital indication that is used to detect the presence of power supply #1 and #2.
Operation 5-27 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.
5-28 Operation Description Function Alarm test point (ALRM TP) provides access for measuring the cross-over optical level threshold. 3 dB test point (3 dB TP) is used to measure the optical power of the primary receiver. Measurements at this test point are 3 dB less than the actual value. Potentiometers ICS1 through ICS4 Control the attenuation of the ingress control switches (ICS) when they are installed in the return paths of the RF output ports.
Operation 5-29 Ingress Control The SG 2000 platform incorporates electronic ingress control switching enabling operators to choose one of three options for troubleshooting noise sources. A maximum of four switches, (one ingress switch per RF port) can populate the RF amplifier. Figure 3-2 illustrates their location on the RF chassis.
Append ix A Specifications Specifications for the SG 2000 are valid over the given bandpass and operating temperature range listed in this section. The current catalog may contain additional information not provided below.
A-2 Specifications Parameter Specification Flatness over passband ±0.75 dB, all ports Operational tilt (standard) 750 MHz:10 dB ±1 dB (low),12.5 dB ±1 dB (standard), 14 dB ±1 dB (high) 870 MHz: 9 dB ±1 dB (low), 11.
Specifications A-3 Table A-5 lists the RF performance specifications for the SG2-IFPT laser transmitter: T able A- 5 SG 2- I F PT RF sp e cif i c at i o n s Parameter Specification Nominal RF input impedance 75-ohms RF passband 5 MHz to 65 MHz Flatness (peak to valley) 1.00 dB maximum RF input return loss 18 dB minimum Recommended total input power +15 dBmV Carrier to noise ratio 9 dB link, 35 MHz BW 40 dB minimum, +25±5°C and 36.5 dB minimum from –40°C to +60°C.
A-4 Specifications Table A-7 lists the RF performance specifications for the SG2-DFBT laser transmitter: T able A- 7 SG 2- D FBT R F sp ec if i cat io n s Parameter Specification Nominal RF input impedance 75-ohms RF passband 5 MHz through 200 MHz Flatness (peak to valley) 1.
Specifications A-5 Table A-9 lists the RF performance specifications for the SG2-EIFPT laser transmitter: T able A- 9 SG 2- EI F PT RF sp e cif i cat io n s Parameter Specification Nominal RF input impedance 75-ohms RF input passband 5 MHz through 65 MHz Flatness (peak to valley) 1.00 dB maximum RF input return loss 18 dB minimum Recommended total input power +15 dBmV Optical output power 1 mW (1 dBm), nominal Carrier to noise ratio 9 dB link, 35 MHz BW 36.
A-6 Specifications Table A-11 lists the RF performance specifications for the SG2-DRT-2X/A digital return transmitter: T able A- 1 1 SG 2- D RT - 2 X/ A R F sp ec if i c at i o n s Parameter Specification Nominal RF input impedance 75-ohms RF passband 5 MHz through 42 MHz Flatness (peak to valley) ±0.
Specifications A-7 Table A-13 lists the current requirements for various options and the two platforms available in the SG 2000: T able A- 1 3 Cu rr ent req u i r em en t s Option Watts ac pow er Amps @90V Amps @60V Amps @52V Amps @44V Silicon Module D, F Module C, E, G Module B 82.48 69.36 56.24 1.22 1.03 0.83 1.83 1.54 1.25 2.11 1.78 1.44 2.50 2.10 1.70 Gallium Arsenide (GaAs) Module D, F Module C, E, G Module B 92.72 77.04 61.36 1.37 1.14 0.91 2.06 1.71 1.36 2.38 1.98 1.57 2.81 2.
A-8 Specifications Table A-14 lists distortion and c/n performance for the SG2-75 with a load of 77 channels: T able A- 1 4 SG 2- 75 p erf o r m an ce , w it h 77 c h a n n el s 77 Channels Link Launch System C/N 52.3 64/65 52.0 CTB –67 –67 –61 CSO –62 –67 –61 Link: SG2-LR w/ALM9, 77ch, 20km Loss budget 9.0 dB Output level (550 MHz), 44.0 dBmV/ch Output level (50 MHz), 38.
Append ix B To r q u e S p e c i f i c a t i o n s Torque specifications are valid for all models of the SG 2000 node. Torque Fastener Screw Size Wrench Size In-lbs Ft-lbs N-m Strand clamp/pedestal mounting 5/16-18 1/2 inch 120-144 10-12 13.6-16.3 Housing/lid closure 5/16-18 1/2 inch 144 12 16.3 External/internal port plugs 5/8-24 1/2 inch 25-40 2.1-3.3 2.8-4.5 Seizure screw #8-32 3/16 inch 11-12 0.9-1.0 1.2-1.4 Hybrid #6-32 Phillips 15-17 1.2-1.4 1.7-1.
Abbreviations and Acronyms The abbreviations and acronyms list contains the full spelling of the short forms used in this manual.
Abbreviations and Acronyms-2 NTSC National Television Standards Committee OMI optical modulation index P-V Peak-to-valley pA picoampere RF radio frequency RIN relative intensity noise RSA return for service authorization SC snap connector TCU thermal control unit V volt VCXO Voltage controlled crystal oscillator XO Crystal oscillator SG 2000 Installation and Operation Manual
481740-001 12/01 MGBI
