STARLINE® SLW2500 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 ..................................................................................................................... 1-3 If You Need Help ..............................
ii Contents Section 4 Installation Splicing Fiber ..................................................................................................................................4-1 Strand Wire Mounting .......................................................................................................................4-3 Coaxial Cables .................................................................................................................................4-5 Fiber Cables ....................
Contents iii Figure 3-1 SLW2500 lid showing major components ............................................................................ 3-1 Figure 3-2 SLW2500 RF chassis ........................................................................................................ 3-2 Figure 3-3 Fuse configuration ........................................................................................................... 3-3 Figure 3-4 AC fuse locations...........................................................
S ec ti on 1 Introduction ® ® Motorola’s STARLINE light-wire telecommunications optical node, Model SLW2500, performs lightwave-to-RF and RF-to-lightwave signal conversions in an optical transmission link. It supports 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 SLW2500 optical node: Figure 1-2 SLW2500 node — open -20dB -20dB TCU M AN FWD EQ H POR T 1 FWD EQ H -20dB L -20dB JXP 1 s JXP 5 FTEC POR T 2 L F1 F2 VARIL OSS ER LPF JXP 2 M AN A UTO s JXP 6 SLW 25- F7 R ESP F5 CAUTION: s LPF JXP 8 s FRB LPF L H JXP 7 s H PF LPF JXP 4 JXP 3 F4 POR T 3 CONTAINS PARTS ANDASSEMBLIES SUSCEPTIBLE TO DAMAGE BY ELECTROSTATIC DISCHARGE ( ESD) LPF FWD INPU T -20dB FWD EQ -20dB R TN 2 R
Introduction 1-3 Using This Manual The following sections provide information and instructions to install, configure, and operate the ™ SLW2500 in an AT&T system: Section 1 Introduction provides a product description, related documentation, the technical help line, and repair/return information. Section 2 Overview describes the functions of the SLW2500 and includes details regarding options and their functions.
1-4 Introduction Calling for Repairs If repair is necessary, call Motorola’s 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 7:00 AM to 4:00 PM Pacific Time, Monday through Friday.
S ec ti on 2 Overview The STARLINE SLW2500 is the newest addition to the next generation of telecommunications optical nodes. It supports evolving fiber-deep networks and meets AT&T’s needs for a single and two-way broadband network application that includes broadcast video, telephony, and data. The forward path is factory-configured with one SG2-LR receiver and four high-level RF outputs. Return-path configuration consists of an SG2-DFBT optical transmitter and SLW25-LPLR return-path receiver.
2-2 Overview Housing The SLW2500 optical node is furnished in an aluminum housing that protects the electronics from weather and dissipates internally generated heat. Figure 2-1 illustrates the SLW2500 housing and provides its dimensions: Figure 2-1 SLW2500 housing dimensions — front and side view 2 4 OUT 6 12.25 8 3 4 7 3 1 21.60 5 10.99 Coaxial cable connections to the housing are made using conventional 5/8 inch × 24 threads per inch, stinger-type connectors.
Overview 2-3 Port Locations Five housing ports provide connection for coaxial cables. Housing Port 2 (OUT) is used only for connection to an external 60 Vac or 90 Vac power supply. Side-by-side connector fittings are limited to .750 inches at Port 1 (IN) and 2 and/or Port 3 (1) and 4 (3). All ports are protected by factory-inserted threaded plugs or plastic cap plugs. Discard these plugs when you install the cable connectors.
2-4 Overview Gaskets Each housing is equipped with a woven-wire RF gasket and a silicone-rubber gasket to provide a seal between the housing base and lid. These gaskets provide efficient ground continuity, RF shielding, and weather protection. Both gaskets must be in place and in good condition to ensure proper operation and protection of the station. The weather gasket should be lightly coated with silicone grease each time the node is opened. Replace this gasket if it becomes damaged or deformed.
Overview 2-5 Power Supply The SLW2500 power supply (SG2-PS) is located in the housing lid to optimize heat transfer and to balance the thermal load between the base and the lid. An umbilical cord connects the SG2-PS to the base. You can power the node from either 60 Vac (LO) or 90 Vac (HI) system power supplies. The unit is shipped from the factory set for 60 Vac powering.
2-6 Overview Forward Path The multiple receiver functionality of the platform accommodates split-band applications. A typical split-band configuration has analog signals in the 54 MHz to 450 MHz band feeding one receiver. Digital transmissions or narrowcast signals are carried between 450 MHz and 870 MHz on another fiber and processed by the second receiver. Figure 2-5 provides a diagram of the signal flow-path through the SLW2500: Figure 2-5 Signal flow diagram 19.
Overview 2-7 A driver-hybrid amplifies the signal to a sufficiently high level to feed up to four power-doubling output stages. These output hybrids use enhanced gallium arsenide (GaAs) types for higher station output at low distortion. Plug-in facilities are available ahead of each output stage for individual equalizer boards. These can be installed to customize the tilt for the various ports. Minus 20 dB directional test points are available at various points in the signal paths of the node.
2-8 Overview SG2-LR Receiver The receiver module, SG2-LR, is designed specifically for high performance in the SLW2500. The SG2-LR receiver uses an integrated optical-hybrid photo-detector for improved RF performance over the entire 54 MHz through 870 MHz passband.
Overview 2-9 Return Path To meet future return-path requirements, you can upgrade the SLW2500 with various optical transmitters to accommodate data and video signal transmission. Signal levels are adjusted in the return path using model JXP-* attenuator pads. Units are typically shipped with a JXP-6 (6 dB) attenuator pad at the input of the transmitter. Optical Return Transmitters Three optical return transmitters are available to meet the needs of most return applications.
2-10 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.
Overview 2-11 Gain Selection To use the gain option selection chart, Figure 2-8, 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. If this intersection is above and to the left of the diagonal standard gain line for the channel loading under consideration, the SLW2500 will give optimum performance with minimum padding.
2-12 Overview Tilt Selection Tilt is factory set to 16 dB.
Section 3 Bench Setup Before you install the SLW2500, it must be set-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.
3-2 Bench Setup Figure 3-2 illustrates the RF chassis with the cover removed indicating the location of major components: Figure 3-2 SLW2500 RF chassis Gain control (MAN ADJ) Driver hybrid MDR board Drive unit selector (AUTO/MAN) TCU Output hybrid port 2 Output hybrid port 1 Return pad Diplex filter Diplex filter s s s s Diplex filter Output hybrid port 3 Flatness board AT&T SLW2500 Installation and Operation Manual s Diplex filter Output hybrid port 4
Bench Setup 3-3 Powering the Node You can conveniently power the SLW2500 by applying 60 Vac or 90 Vac to housing Port 2 (ac port). 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. Figure 3-4 illustrates the ac fuse locations in the RF chassis of the SLW2500.
3-4 Bench Setup CAUTION! Voltages up to 90 Vac are accessible. To avoid shock hazard confirm that no power is applied to the node before removing cover or replacing fuses.
Bench Setup 3-5 Power Supply Settings You can power the SLW2500 from 60 Vac or 90 Vac system supplies. The unit is shipped from the factory set for 60 Vac (LO). If your system uses 90 Vac powering, reposition the suitcase jumper on the dc power supply to the 90 Vac (HI) position to optimize the supply turn-on voltage for the higher input range. Note that no damage results if the jumper is not changed.
3-6 Bench Setup Quick Checks - Functional Testing It is recommended that you perform the procedures presented in the following subsections before you place the SLW2500 in service. Forward Path Figure 3-1 illustrates the location of the forward-path receiver module. To set up the forward-path receiver: 1 Confirm the receiver configuration required. For a broadcast only receiver configuration use position A. For broadcast/narrowcast receivers, use optical receiver A and B positions.
Bench Setup 3-7 Ma n u a l Ga i n Con trol 1 Connect a signal level meter to the FORWARD TEST POINT and tune it to a channel near 550 MHz. 2 Position the drive selector to the MAN position. Figure 3-2 illustrates the location of the AUTO/MAN drive selector. 3 Turn the gain control, MAN ADJ, to maximum (fully clockwise) and then turn it counterclockwise to reduce the output by 3 dB.
3-8 Bench Setup Table 3-2 provides JXP values as a function of the optical input and RF output level. Table 3-2 SLW2500 pad chart Input O u tp u t (d B m V) (d B m) 50 51 52 53 54 55 56 57 58 8 7 0 7 7 0 7 6 0 7 5 0 7 4 0 7 3 0 8 7 0 7 7 0 7 6 0 7 5 0 7 4 0 7 3 0 7 2 0 8 7 0 7 7 0 7 6 0 7 5 0 7 4 0 7 3 0 7 2 0 7 1 0 2.0 Receiver JXP MidMid-stage JXP Output JXPs 1.5 Receiver JXP MidMid-stage JXP Output JXPs 1.0 Receiver JXP MidMid-stage JXP Output JXPs 0.
Section 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 § Placing the unit in service To avoid excess weight and the possibility of damage during installation, the housing is normally mounted before the inclusion of the expensive electronic components.
4-2 Installation CAUTION! 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. WARNING! To avoid possible injury to personnel or damage to the equipment, remove 60/90 volt ac power from the system before you install the node. 3 Assemble the splice enclosure following the instructions furnished with the enclosure. 4 Complete the splicing and installation of the splice enclosure.
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 Figure 4-3 Mounting bracket-rear and side views 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 clamp 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: Figure 4-4 Center conductor length 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. Rotate these bolts away from the cover.
4-6 Installation Fiber Cables To install fiber cables in the lid: 1 Remove the protective port plug from the side of the housing lid and carefully pass the connector ends of the fiber service cable through this port. It is necessary to insert one connector at a time. Be careful not to bend the fiber any more than is necessary. 2 Thread the compression fitting into the port.
Installation 4-7 Figure 4-6 Fiber spool tray Fiber routed to optics modules through fiber tray pegs 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.
Section 5 Operation This section provides information concerning the use of various options and applications required by AT&T. It may be helpful to refer to Figures 3-1 and 3-2 that illustrate the major components in the SLW2500 lid and RF chassis.
5-2 Operation F ea tu re D es c rip ti on Receiver enable A green LED that provides visual indication of the receiver’s enable status. Fault indicator A red LED that illuminates when the module is enabled but the hybrid current is outside the normal operating range. Optical power status A green LED that is ON when the optical power is within the recommended operating range (refer to Table A-4).
Operation 5-3 SG2-DFBT Optical Transmitter The SG2-DFBT is an isolated distributed feedback (DFB) return path optical transmitter used in the SLW2500 node platform. It has a nominal optical output power of 1.0 mW and is used in conjunction with an AM-RPR, AM-OMNI-RPR/2, or other similar return-path optical receiver.
5-4 Operation SLW25-RPLR Return-Path Laser Receiver The SLW25-RPLR is a return-path optical receiver used in the SLW2500 node platform. It is used in conjunction with a Motorola AM-Blazer, AM-OMNI-LM*, AM-OMNI-ALM, MegaStar, or other similar optical transmitter.
Operation 5-5 Table 5-5 SLW25-RPLR output levels T y p i c a l O u tp u t (d B mV) dBm/mW T est Point (volts) 45.0 2.0/1.6 1.6 43.0 1.0/1.3 1.3 41.0 0.0/1.0 1.0 39.0 −1.0/0.8 0.8 37.0 −2.0/0.6 0.6 35.0 −3.0/0.5 0.5 Configuration The following subsections describe your options in preparing the SLW2500 for service in the distribution system.
5-6 Operation Wa velength 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.
Operation 5-7 CAUTION! CAUTION! Do not pull the optical connector out more than two inches from the casting wall. If you pull the connector out too far, you must disassemble the module and respool the fiber. 7 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.
5-8 Operation Cleaning the Optical Connector The design of the SLW2500 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 module’s 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.
Ap p en d i x A Specifications Specifications for the SLW2500 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 Table A-3 lists the general characteristics for the SLW2500 node: Table A-3 General characteristics Pa ra meter Sp ecifications AC input voltage 44 Vac through 110 Vac quasi-squarewave AC bypass current 15 A Hum modulation –70 dB @ 15 A bypass current Operating temperature –40°C through +60°C (–40°F through +140°F) Housing dimensions 21.6”(L) × 10.6”(W) × 11.0”(D), (without bracket) Weight Minimum 36 lbs./maximum 42 lbs.
Specifications A-3 Table A-5 lists the RF performance specifications for the SLW25-RPLR laser transmitter: Table A-5 SLW25-RPLR 1 2 Pa ra meter Sp ecification Optical input power range-recommended –4.0 dBm to +2.0 dBm Optical input power-maximum recommended1 3 dBm Optical input return loss 40 dB minimum RF passband 5 MHz through 300 MHz Gain at 40 MHz2 19.5 dB minimum Flatness 1 dB P-V maximum Tilt –0.5 dB to +1.
A-4 Specifications Table A-7 lists the current requirements for various options and the two platforms available in the SLW2500: Table A-7 Current requirements O p tion Wa tts AC p ower Amp s @90V Amp s @60V Amp s @52V Amp s @44V Basic- platform (one-way, single receiver, GaAs) 92.72 1.37 2.06 2.38 2.81 Additional receiver-split band or RPLR 8.96 0.13 0.20 0.23 0.27 Return transmitter 9.84 0.15 0.22 0.25 0.
Specifications A-5 Table A-9 lists nominal distortion and c/n performance for the SLW-87 with a load of 94 channels: Table A-9 SLW-87 performance, with 94 channels 94 Ch a n n el s Lin k La u n c h Sys tem C/N 49 68 49 CTB –56 –68 –54 CSO –64 –55 –52 Link: SG2-LR w/ALM9, 94 ch, 20km Loss budget 9.
Ap p en d i x B Tor q u e S p eci f i ca ti on s Torque specifications are valid for all models of the SLW2500 node. T o rq u e Fa s ten e r Sc r ew Si ze W r en ch Siz e I n - lb s Ft- lb s Strand clamp/pedestal mounting 5/16-18 1/2 inch 120-144 10-12 Housing/lid closure 5/16-18 1/2 inch 48-72 4-6 Port plugs 5/8-24 1/2 inch 25-40 2.1-3.3 Seizure #8-32 3/16 inch 11-12 .9-1 Chassis (E-pack) #10-32 5/16 inch 18-22 1.5-1.8 Chassis cover #6-32 ¼ inch 15-17 1.3-1.
Abbreviations and Acronyms The abbreviations and acronyms list contains the full spelling of the short forms used in this manual.
Abbreviations and Acronyms-2 RIN relative intensity noise RSA return for service authorization SC snap connector TCU thermal control unit V volt AT&T SLW2500 Installation and Operation Manual
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