Diamond Transport System Reference And Installation Manual

Transcript

DT SERIES RECEIVERS 139 140 142 144 Controls, Indicators, and Connectors ............................................................................................................. FRX ............................................................................................................................................................................. 1RRX-D2A ............................................................................................................................................................. 2RRX ......................................................................................................................................................................... 146 146 147 148 Functional Description ............................................................................................................................................. FRX ............................................................................................................................................................................. 1RRX-D2A ............................................................................................................................................................. 2RRX ......................................................................................................................................................................... 149 149 150 151 Automatic Shutdown ................................................................................................................................................ Automatic Shutdown: Break in the Forward Link ........................................................................... Automatic Shutdown: Break in the Return Link ............................................................................... Setting Up Automatic Shutdown .............................................................................................................. 153 154 155 156 Installation ........................................................................................................................................................................ Before You Start ................................................................................................................................................. Tools and Equipment ....................................................................................................................................... Installing the Receiver ....................................................................................................................................... Making the Optical Connection ................................................................................................................. Making the RF Connections ......................................................................................................................... 161 161 162 163 165 168 Setup .................................................................................................................................................................................. Tools and Equipment ....................................................................................................................................... Monitoring and Adjusting the Receiver ................................................................................................. Setting the Optical Alarm Threshold (optional) ............................................................................... Disabling the Alarm ........................................................................................................................................... Checking RF Output and Using the Gain Control Adjustment ............................................... 170 170 171 172 173 174 Removing a Module ................................................................................................................................................... 175 Specifications .................................................................................................................................................................. 176 Diamond Transport Receivers 9 November 2001 137 Receiver Equipment Description ............................................................................................................................................ FRX ............................................................................................................................................................................. 1RRX-D2A ............................................................................................................................................................. 2RRX ......................................................................................................................................................................... Next Chapter Contents 138 9 November 2001 Diamond Transport Receivers Equipment Description Both forward (FRX series) and return (1RRX-D2A and 2RRX series) optical receivers are available for use in the Diamond Transport Shelf. The DT-1RRX-D2A return receiver accepts digital optical input from a TSOT-2AD series transmitter in a TIARRA node. The receiver’s digital-to-analog processor converts the optical input to two analog RF outputs. 2RRX Series Return Receivers The 2RRX series return receiver accepts optical signals from the return transmitter at the optical node. The photo-diode inside each receiver converts optical input to RF energy. The 2RRX features two receivers in a single module, which occupies one slot in the Diamond Transport Shelf. Receiver 1RRX Series Next Chapter FRX Series Forward Receivers The FRX series forward receiver accepts optical input and converts it to RF energy. Residing in either a headend or hub sight, this receiver feeds the RF signals either to an RF amplifier and splitter or to an optical transmitter. Diamond Transport Receivers 9 November 2001 139 FRX G ain Powe r T hr esh Figure 60. FRX Series Forward Receiver Module The Diamond Transport FRX is a full bandwidth forward optical receiver for use in hub (OTN) applications. The FRX series forward receiver accepts optical input and converts it to an RF spectrum of signals. The 801-FRX and 803-FRX series forward receivers are functionally identical, but the 803-FRX models accept higher level optical input: • 801-FRX models have an optical input dynamic range of -10 dBm to +1 dBm • 803-FRX models have an optical input dynamic range of 0 dBm to +3 dBm FRX series forward receivers offer nearly distortion-free performance, making them nearly transparent in repeater applications. The receiver’s high-efficiency photo hybrid has excellent carrier-to-noise performance over long links. The FRX is configured in a standard Diamond Transport module chassis, which occupies one slot in the Diamond Transport Shelf. The module supports Philips Automatic Shutdown feature as well as the Philips EMS; both options allow the receiver to communicate with other equipment in the network. Housing: A die-cast aluminum alloy housing protects the FRX receiver's internal circuitry. The housing’s patented fin design provides superior heat dissipation to extend product life and enhance reliability. User test points and adjustments are front-panel accessible. 140 9 November 2001 Diamond Transport Receivers Internal Circuits: Optical signals enter the FRX receiver through a photo hybrid where they are converted to an RF spectrum of signals and amplified. Next, the RF signals are routed through a gain control circuit before leaving the receiver through the connector on the back panel. Back Panel: The back panel of the FRX contains an RF output connector, a connector for network interface capability, and a power connector. Receiver Models The FRX is available in several configurations based on optical input range and connector type: Next Chapter Front Panel: A two-color LED indicates normal operating and optical alarm conditions. An optical input power monitor test point and a -20 dB RF output test point allow you to check input and output levels. Diamond Transport Receivers 9 November 2001 141 1RRX-D2A Figure 61. 1RRX-D2A Series Digital Receiver The DT-1RRX-D2A converts the optical input from a TIARRA node’s TSOT-2AD to two analog RF outputs. The 1RRX-D2A digital return receiver works with a TSOT-2AD series digital return transmitter residing in a TIARRA node. The receiver’s digital-to-analog processor converts optical input to two analog RF outputs. With the TSOT-2AD/ITU module transmitting digital signals on a specific ITU channel to a DT-1RRX-D2A return receiver, you can transport digital optical return signals 100 kilometers, with a 35 dB (HP version) or 25 dB (standard version) link budget that accommodates combining, splitting, and dense wave division multiplexing (DWDM). With DWDM components in the link, you can combine as many as 20 node return signals onto one fiber, thus improving fiber usage. The DT-1RRX-D2A is configured in a standard Diamond Transport module chassis, which occupies one slot in the DT Shelf, and requires the DT-PS/AC3-0200-UNIV R power supply. The module supports Philips Automatic Shutdown feature as well as the Philips EMS; both options allow the receiver to communicate with other equipment in the network. 142 9 November 2001 Diamond Transport Receivers Housing: A die-cast aluminum alloy housing protects the DT-1RRX-D2A receiver's internal circuitry. The housing’s patented fin design provides superior heat dissipation to extend product life and enhance reliability. User test points and adjustments are front-panel accessible. Back Panel: The back panel of the 1RRX-D2A contains an RF output connector, a connector for network interface capability, and a power connector. Models The 1RRX-D2A is available in three bandwidths: 5 MHz to 42 MHz, 5 MHz to 48 MHz and 5 MHz to 65 MHz. DT-1RRX-D_A- _ _/APC- _ _ _ _ Diamond Transport HP = High Performance Single Input Return Receiver Converts Digital Input to Analog Outputs D2A = 2 Analog Outputs Optical Connector Type FC = ferrule connector SC = snap connector Angled Polished Connector Bandwidth 48 = 5 to 48 MHz (filtered to 42 MHz) Diamond Transport Receivers 9 November 2001 143 Receiver Front Panel: A two-color LED indicates normal operating and optical alarm conditions. An optical input power monitor test point and a -20 dB RF output test point allow you to check input and output levels. Next Chapter Internal Circuits: Optical signals enter the 1RRX-D2A receiver through a photo hybrid where they are converted to an RF spectrum of signals and amplified. Next, the RF signals are routed through a gain control circuit before leaving the receiver through the connector on the back panel. 2RRX G ain A Po wer A Po wer B T hr esh A G ain B T hr esh B Figure 62. 2RRX Return Receiver Module The 2RRX series return receiver fits into a Diamond Transport Shelf and receives optical signals from a return transmitter in the network. Two complete receivers occupy one module slot. The 2RRX series return receiver accepts optical signals from the return transmitter at the optical node in a hybrid-fiber coaxial network. The 2RRX receiver supports the automatic shutdown feature as well as the Philips EMS; both options allow the receiver to communicate with other equipment in the network. Housing: A die-cast aluminum alloy housing protects internal circuitry. The housing’s patented fin design provides superior heat dissipation to extend product life and enhance reliability. User test points and adjustments are front-panel accessible; optional adjustments are found on the module's side panel. The back panel of the module housing contains connectors for RF output, control signals, and DC power. Internal Circuits: The 2RRX series receiver’s photo-diode converts optical input to RF signals. An RF amplifier circuit amplifies signals before passing them on to a gain control circuit, which sets the RF output signal level. An automatic shutdown circuit monitors incoming optical signals and activates an alarm condition when the input falls below a threshold level. Each receiver has separate optical input and RF output path. Isolation between the receivers in the 2RRX is greater than 65 dB. 144 9 November 2001 Diamond Transport Receivers Front Panel: When illuminated, a two-color LED indicates normal operating and optical alarm conditions. When the LED glows red, optical input power is below the threshold level; when the LED glows green, optical input is above the threshold level. Rear Panel: The rear panel of the receiver module has a connector for DC power, a connector for network monitoring signals, and two connectors for RF output signals. Receiver Models The 2RRX is available with an FC, SC, or E2000 optical connector. Next Chapter Test points—for both optical input and RF output—are front-panel accessible. A gain control adjustment allows control of RF output signal over a 10 dB range. The optical input alarm threshold may also be adjusted from the front of the module. Diamond Transport Receivers 9 November 2001 145 Controls, Indicators, and Connectors FRX Figure 63. FRX Controls, Indicators, and Test Points Controls, indicators, and test points are mounted on the front panel to facilitate monitoring and adjustment. Designation Description Power/Alarm LED Gain Control Adjustment 2-Color LED: Green indicates normal operating condition; red indicates that input is below the alarm threshold. Adjustment for RF output level (up to 6 dB). Input Alarm Threshold Adjust Adjustment for the optical input alarm threshold set point. Optical Input Test Point DC Test point to monitor optical input power. RF Output Test Point -20 dB test point to measure RF output. RF Output Connector Carries RF signals out of the module. DC Power Connector DC power enters through this 10-pin connector. Control Signal Connector Direct connection to the network interface card and to selected lines for manual shutdown feature. 10-position switches for Automatic Shutdown. Set the receiver to send a logic signal to its corresponding forward transmitter using a specific line. 10-position switch used to set the time interval for restart in the event of an automatic shutdown. Factory-set to repeat approximately every 65 seconds. SW1 and SW2 (on side, not shown) SW5 (on side, not shown) 146 9 November 2001 Diamond Transport Receivers 1RRX-D2A Gain Controls Power LEDs Power Connector RF Output A RF Output B RF Output Test Point Figure 64. 1RRX-D2A Controls, Indicators, and Connectors Automatic Shutdown and restart controls are set through the side panel prior to installation. Designation Description Power / Status LEDs Steady Green = Link is locked, and status is OK. Flashing Green = Link is locked, but there are excessive errors. Output shut off. Red = System cannot lock on link. Adjustment for RF output (GainA and GainB) level (up to 12 dB). Gain Control RF Output Test Point Selector RF Output Test Point DC Power Connector Control Signal Connector RF Output Connector SW3 and SW4 (Located on the side of the RX module.) SW5 (Located on the side of the RX module.) Diamond Transport Receivers Switch to toggle between the RF output of receiver A and receiver B for the shared output test point. Shared by receivers A and B. Reads 20 dB down from actual level. The position of the TP Switch determines which receiver is monitored. DC power enters through this 10-pin connector. Direct connection to the network interface card and to selected lines for manual shutdown feature. G-style RF connectors (A/B) that connect to the DT Shelf (RF Out A to Shelf C, and RF Out B to Shelf D). Signals are sent to either another return transmitter (if 1RRX is at a hub site), or used for other headend equipment (if 1RRX is located at the headend). 10-position switches for Automatic Shutdown. Sets the receiver to send a logic signal to its corresponding forward transmitter using a specific line. Factory-set to off (0). 10-position switch used to set the restart interval following an automatic shutdown. Factory-set to off (0). 9 November 2001 147 Receiver RF Output A/B Toggle Switch Next Chapter Control Signal Connector 2RRX Figure 65. 2RRX Controls, Indicators, and Connectors The 2RRX offers controls, indicators, and connectors for both of its receivers (designated as RXA and RXB). Designation Description Power LEDs One 2-Color LED for each receiver (PowerA and PowerB): Green indicates normal operations; red indicates that input is below the alarm threshold. Adjustment for RF output level (up to 6 dB). One for each receiver: GainA and GainB. Adjustment for the optical input alarm threshold set point (factory setting –18 dBm). One for each receiver: ThreshA and ThreshB. DC Test point to monitor optical input power. One for each receiver: Opt TPA and Opt TPB . Switch to toggle between the RF output of receiver A and receiver B for the shared output test point. Shared by receivers A and B. Reads 20 dB down from actual level. The position of the TP Switch determines which receiver is monitored. DC power enters through this 10-pin connector. Direct connection to the network interface card and to selected lines for manual shutdown feature. G-style RF connectors to carry return signals. Signals are sent to either another return transmitter (if 2RRX is at a hub site), or used for other headend equipment (if 2RRX is located at the headend). 10-position switches for Automatic Shutdown. Sets the receiver to send a logic signal to its corresponding forward transmitter using a specific line. SW1 and SW2 used for receiver A, SW3 and SW4 for receiver B. 10-position switch used to set the restart interval following an automatic shutdown. Factory-set to repeat approximately every 65 seconds. Gain Control Input Threshold Adjust Optical Input Test Point RF Output Test Point Toggle Switch RF Output Test Point DC Power Connector Control Signal Connector RF Output Connector SW1, SW2, SW3, and SW4 SW5 148 9 November 2001 Diamond Transport Receivers Functional Description The FRX, 1RRX-D2A, and 2RRX receivers process optical, RF, power, and network monitoring signals. Receiver Next Chapter FRX Figure 66. FRX Functions The photo-hybrid offers excellent C/N performance over long links. Forward Optical Signals: Optical signals enter the receiver through a factory-installed optical connector. The receiver contains a high-efficiency photo-hybrid circuit, which converts the optical signals to RF and amplifies them. Forward RF Signals: RF signals are routed from the amplifier to gain control circuitry, which adjusts the output level within a 6-dB range. Internal circuits compensate for slope and ensure signal flatness. DC Power: DC power enters the receiver through a 10-pin connector on the back panel and is routed to active components. Control Signals: The FRX sends and receives status and control information via an edge-type connector that is used for automatic shutdown and status monitoring. Diamond Transport Receivers 9 November 2001 149 1RRX-D2A Figure 67. 1RRX-D2A Functions The 1RRX-D2A return receiver accepts one optical input and provides two RF output paths. Return Optical Signal Flow: Optical signals enter the receiver through a factory-installed optical connector on the front panel. The optical diode inside the module converts these optical signals to a digital stream. DC Power: DC power (from the DT-PS/AC3-0200-UNIV R power supply) enters the receiver module through a 10-pin power connector and is directed to the module’s active components. Control Signals: Network monitoring signals enter and exit the receiver module through an edge-type connector on the back panel. If status monitoring is in use, the 1RRX-D2A provides device identification (also called the module code). The optional Automatic Shutdown feature also uses the network monitoring connector. See “Automatic Shutdown” for more information. 150 9 November 2001 Diamond Transport Receivers Receiver Next Chapter 2RRX Figure 68. 2RRX Functions The 2RRX module combines two receivers in a single housing, each with its own optical input and RF output path. The two receivers share an RF output test point; users select which of the receivers is tested by setting a toggle switch. Return Optical Signal Flow: Optical signals enter the receiver through a factory-installed optical connector on the front panel. The pin photo-diode inside the module converts these optical signals to RF. Each receiver has an optical input path. Return RF Signal Flow: Return RF signals are routed from the photo-diode to the RF amplifier circuit. Next, the gain control circuit adjusts the signal level for output to the RF cable. Each receiver has its own RF output path. Diamond Transport Receivers 9 November 2001 151 DC Power: DC power enters the receiver module through a 10-pin power connector and is directed to the module’s active components. The 2RRX communicates with network management equipment using SPI bus protocol. Control Signals: Network monitoring signals enter and exit the receiver module through an edge-type connector on the back panel. If status monitoring is in use, the 2RRX provides the following information: • • • • device identification (called the module code), optical input power, threshold alarm set point, and threshold alarm on/off status. The optional Automatic Shutdown feature also uses the network monitoring connector. See “Automatic Shutdown” for more information. 152 9 November 2001 Diamond Transport Receivers Automatic Shutdown Automatic (or “Safety”) Shutdown prevents the transmission of light through severed fiber optic cables. Automatic Shutdown is an active process triggered by a logic signal. Absence of the logic signal does not disable the transmitter, so this module operates normally if no return receiver is in place or Automatic Shutdown is not used. • the transmitter is part of a two-way optical link, • both the return receiver and the transmitter in the link communicate over the same line, and • the return receiver senses an absence of light and sends the necessary logic to the transmitter. To use automatic shutdown, you must set up the receiver(s) before you install the module. If you will not use this feature, skip to “Installing the Receiver” on page 163. Return receivers can shut down transmitters that reside in the same shelf or in different shelves: • For modules in the same shelf, no additional equipment is needed because the Automatic Shutdown logic signals travel from the return receiver to the transmitter via the shelf ’s back panel. • For modules in separate shelves, the logic signal exits the return receiver and travels to the shelf ’s manual shutdown connector on the Diamond Transport shelf ’s back panel. The logic signal passes through a ribbon cable to the correct shelf and then travels through the shelf ’s back panel to the correct transmitter. To carry the logic signal between shelves, install a ribbon cable with a 16-pin connector on each end. Diamond Transport Receivers 9 November 2001 153 Next Chapter Automatic Shutdown is triggered only under the following conditions: Receiver The Automatic Shutdown feature does not require any software; it is hard-wired and available with no additional equipment. The Automatic Shutdown feature is factory-set to OFF. Automatic Shutdown: Break in the Forward Link When the forward link is broken, the following events take place: • no return optical signal is generated at the node • the 2RRX detects the loss of light and generates a logic signal that shuts down the transmitter. Figure 69. Automatic Shutdown: Break in Forward Link The 2RRX detects a break in the forward link and generates a logic signal. Similarly, when the forward link is broken with a 1RRX-D2A in the configuration, the receiver detects the loss of light and generates a logic signal that shuts down the transmitter. Figure 70. Automatic Shutdown: Break in the Forward Link The 1RRX-D2A detects a break in the forward link and generates a logic signal. 154 9 November 2001 Diamond Transport Receivers Automatic Shutdown: Break in the Return Link When the return link is broken, the following events take place: The FRX, 1RRX-D2A, and 2RRX have restart cycles that attempt to reactivate the link once it is restored. • The 1RRX-D2A and 2RRX detect the loss of light and shut down the forward transmitter. • The FRX detects the loss of light and shuts down the Figure 71. Automatic Shutdown—Break in the Return Link The return receiver detects a break in the return link and signals the forward transmitter. The FRX detects the loss of light and shuts down the return transmitter. After shutdown occurs, the return receiver sends a restart signal to the transmitter to check the condition of the link. When it receives an optical signal, the forward receiver signals the 200-TX or TSOT-2AD. Diamond Transport Receivers 9 November 2001 155 Receiver Next Chapter return transmitter. Setting Up Automatic Shutdown In order for the shutdown loop to function, an FRX receiver must be set to shut down a corresponding forward transmitter. Hard-wired communication lines link the receivers to the transmitters. Automatic shutdown is factory-set to Off (0). Automatic shutdown must be set up before you install the receiver module in a shelf. Set the line numbers for the receiver and transmitter as follows: 1. Find the switches on the side of the receiver module. 2. Using a small, non-conducting alignment tool, set the switches to their proper positions (provided in “Switch Settings for Automatic Shutdown” on page 157) by pointing the arrow to the proper setting number. For use with redundant receivers, see “DT-SWITCH DRIVER” on page 247. 156 9 November 2001 Diamond Transport Receivers Switch Settings for Automatic Shutdown NO Auto. Shutdown 1 1 3 2 5 3 7 4 9 5 11 6 13 7 15 8 — **9 2 10 4 11 6 12 8 13 10 14 12 15 14 16 16 (GND) *17 — **18 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 0 0 0 0 0 0 0 0 0 Next Chapter — SW2 SW3 SW4 SW1 (FRX and (1RRX and (1RRX and (FRX and 2RRX RXA) 2RRX RXA) 2RRX RXB ) 2RRX RXB) Receiver Connector Line Pin Number * Line 17 is not connected to the shutdown selector switches. This line provides a ground for shelf connection external to this shelf. ** Do not use lines 9 and 18 if the forward receiver and the transmitter do not reside in the same shelf. 3. Make sure that the corresponding forward transmitter is set to use the same communication line number. See “Transmitters: Installation” starting on page 100. Diamond Transport Receivers 9 November 2001 157 Figure 72. Automatic Shutdown on the FRX Two switches—located on the side of the module—are used to set up Automatic Shutdown on an FRX. Both switches are factory-set to 0. SW5 RestartTimer SW3 SW4 Not used on 1RRX Figure 73. Automatic Shutdown on the DT-1RRX-D2A SW3 and SW4 are used to set up Automatic Shutdown on the DT-1RRX-D2A; both are factory-set to Off. 158 9 November 2001 Diamond Transport Receivers 2 4 8 6 SW1 SW3 SW2 SW4 Figure 74. Automatic Shutdown on the 2RRX The 2RRX has two switches for each of receiver (i.e., four switches total) for setting Automatic Shutdown: Switches 1 and 2 are used with RXA and Switches 3 and 4 are used with RXB. These line-selection switches are factory-set to 0. If the receiver is linked to a transmitter in the same shelf, you’ve finished this procedure. If the receiver is linked to a transmitter in another shelf, connect the shelves by plugging one end of a ribbon cable into the manual shutdown connector on each shelf. Proceed to “Setting the Restart Timer”. Setting the Restart Timer The restart timer is factory-set for a 65-second interval, using position 5 on the switch. If this interval is suitable for your network, proceed to “Installing the Receiver”. If multiple receivers may shut down a single transmitter, only one receiver may be set for reset; set all others to off. Diamond Transport Receivers 9 November 2001 159 Receiver To set the switch, point the arrow to the proper number. This switch is set to 0 or OFF. Next Chapter 0 Figure 75. Setting the Restart Timer SW5 sets the restart interval in the automatic shutdown loop. Set an alternate restart interval as follows: 1. Locate SW5 (through the cover) on the side of the receiver module. (For the 1RRX-D2A, see Figure 73; for the FRX and 2RRX, see Figure 75.) 2. Using a non-conducting alignment tool, set SW5 to the position that corresponds to the desired time interval (accuracy is ±10%). Reset Timer Settings Factory Preset 160 9 November 2001 SW5 Setting Time Interval (seconds) 0 1 2 3 4 5 6 7 8 9 no action 5 20 34 49 65 77 85 92 no action Diamond Transport Receivers Installation This section provides procedures for installing an FRX, 1RRX-D2A, or 2RRX module in the Diamond Transport Shelf, making optical and RF connections, and making any necessary adjustments. Before You Start Review procedures before beginning this installation. Observe the following cautions: • Do not disturb previously installed modules in the Diamond Transport Shelf, especially if fiber is in place. • Be careful not to twist, bend, or pinch fibers when installing and removing modules. • Ensure that the appropriate power supply is installed in the Receiver DT-Shelf. WARNING When powered, optical transmitters generate invisible, high-energy laser beams. Even when the transmitter is not powered, laser beams may be present in the incoming cable. Although you can’t see them, these beams can cause tissue injury, including permanent eye damage. Whenever the optical cable is disconnected from the receiver or patch panel, avoid direct contact with the end of the cable. Be absolutely certain the optical equipment at both ends of the cable is powered off before attempting to clean connectors. CAUTION If installing the HP version of the DT-1RRX-D2A, optical input power must not exceed -8 dBm; excessive optical power damages the photo diode. Diamond Transport Receivers 9 November 2001 Next Chapter If you plan to use automatic shutdown, you must set up the receiver to use this feature before you install the module into the Diamond Transport Shelf. 161 Tools and Equipment • Receiver (FRX, 1RRX-D2A, or 2RRX) module • Diamond Transport Shelf (mounted in a rack) • appropriate DT series power supply The DT-1RRX-D2A requires DT-PS/AC3-0200-UNIV R. • digital address of the communications line that the receiver will use to shut down a corresponding transmitter (Automatic Shutdown option) • • • • small, non-conducting alignment tool clean connector caps compressed air with an extension tube Philips Fiber-Connect-CLNR-ST stick-type cleaner and a Fiber-Connect-CLNR-RT cloth • optical fiber input connector that mates with the connector installed on the receiver • • • • • 162 spectrum analyzer or suitable substitute optical power meter fiber optic patchcord with appropriate connector RF cable 75-ohm F-type terminator 9 November 2001 Diamond Transport Receivers Installing the Receiver Philips recommends that you unplug the shelf ’s DC power supply before attempting to install a receiver in the DT Shelf; however, modules may be “hot-swapped.” WARNING Use extreme caution if the power to the shelf is on. 1. Lower the fiber management tray by pulling down firmly on the tray’s front panel. The ball pins on the sides of the tray will disengage from the shelf. Leave the tray down until you are finished installing modules. 2. Select an open slot for the receiver module, making sure to leave space for PS series power supply modules. Receiver Do not disturb fibers to installed modules. When the tray swings down, there should be enough slack in the fibers so that they are not pulled. Next Chapter Install a receiver in a rack-mounted Diamond Transport Shelf as follows. Diamond Transport Figure 76. Opening the Fiber Management Tray Before inserting modules, swing the fiber tray down. 3. Hold the receiver module with the fins on the left side. Diamond Transport Receivers 9 November 2001 163 The handle must be in the “release” position to permit the module to slide in fully. 4. Push on the module’s handle (on the finned side) as you insert the module into an open slot in the shelf. The tabs on the base of the handle clamp onto the shelf, ensuring firm power and network interface connections. Figure 77. Installing the Module Push the module in until the tabs clamp onto the shelf. Leave the tray down, and proceed to “Making the Optical Connection.” G ain Po wer T hresh Figure 78. Module Installation Using the handle on the side of the module, slide the receiver into an open slot. 164 9 November 2001 Diamond Transport Receivers Making the Optical Connection Each receiver comes with a factory-installed optical connector in place. The input fiber’s optical connector must match the connector on the receiver module. When powered, optical transmitters generate invisible, high-energy laser beams. Even when the transmitter is not powered, laser beams may be present in the optical cable. Although you can’t see them, these beams can cause tissue injury, including permanent eye damage. Whenever the optical cable is disconnected from the transmitter, receiver or patch panel, avoid direct contact with the end of the cable or optical output. Receiver CAUTION If installing the HP version of the DT-1RRX-D2A, optical input power must not exceed –8 dBm; excessive optical power damages the photo diode. Connect the optical fiber as follows: FC Connector: Turn the threaded collar clockwise to tighten it onto the bulkhead. SC or E2000 Connector: If you don’t hear or feel the connector engage with the bulkhead, gently grasp the boot on the connector and push it into the bulkhead. When properly installed, the connector clicks into position. 1. Power off the transmitter that provides the input to the receiver. (This transmitter may be from the Diamond Link 2100 series, the Diamond Transport 700-TX or 800-TX series, or, if installing the DT-1RRX-D2A, from the TSOT-2AD). 2. Clean the optical connector. 3. Test the optical input’s signal level. a. Attach an optical power meter to the fiber’s connector. b. Power on the optical transmitter (at the headend or node). c. Record the reading for future reference. d. Power off the transmitter. Diamond Transport Receivers 9 November 2001 Next Chapter WARNING Before you begin, make sure the return transmitter’s key switch is off. 165 NOTE If installing the 2RRX, test optical input to both receivers (A and B). Repeat steps 1 through 3. Figure 79. Optical Connectors Align the key and slot, and slide the connector into the bulkhead. (An E-2000 connector works much like a standard snap connector.) 5. If the optical input signal is acceptable, connect the forward fiber to the receiver. Aligning the key on the fiber’s connector with the slot on the receiver’s bulkhead, slide the connector into the bulkhead. 166 9 November 2001 Diamond Transport Receivers 6. Lay fibers in the fiber management tray. If fiber is routed out both sides of the fiber-management tray, do not cross fibers. Figure 80. Fiber Routing One possible fiber-routing method routes all fiber in the same direction. Fiber may also be routed to both left and right as long as fibers do not cross over one another. Use the plastic clamps to secure fibers. (FRX shown.) Receiver Use the plastic clamps mounted inside the tray to hold the fibers loosely in place; make sure you leave enough slack in the fibers so that they are not pulled when you lower the tray. Figure 81. Fiber-Management Clamps Plastic clamps mounted inside the fiber management tray facilitate fiber routing. 7. Return the fiber management tray to its upright position. The ball pins on the sides of the tray will engage with the shelf. You have finished making the optical connection. Proceed to “Making the RF Connections”. Diamond Transport Receivers Next Chapter Fiber may be routed in one direction (as shown) or out both sides. 9 November 2001 167 Making the RF Connections RF output connector(s) are located on the rear panel. Connect the RF cable as follows: Connect the RF cable to the outside rear of the DT Shelf, not directly to the receiver module. 1. Find the RF output connector(s) on the rear panel of the Diamond Transport Shelf: a. The FRX connects to the output connector labeled C in Figure 82. b. The 1RRX-D2A and 2RRX use the two output connectors labeled C (for RXA) and D (for RXB) in Figure 83. 2. Connect the RF (RG-59) cable to the appropriate RF output connector(s) on the rear (outside) of the Diamond Transport Shelf. Proceed to “Setup Procedures.” BA C K V IEW A- A-B A-B C- C-D A-B C-D 8 A-B C-D 9 A-B C- 7 6 -B C-D -D A-B C-D 5 -D 4 3 2 Figure 82. FRX RF Connection Connect RF cable to this connector on the back of the FRX. 168 9 November 2001 Diamond Transport Receivers BA C K VIEW A-B A-B C- C-D C-D 9 8 7 6 -B -D -D -D -D C- C- C- C-D -B -B -B A- A- A- A-B 5 4 3 2 Next Chapter A- Receiver Figure 83. 1RRX and 2RRX RF Connections Both the 1RRX and 2RRX require two RF connections. Diamond Transport Receivers 9 November 2001 169 Setup Once you’ve installed a receiver module into the shelf and have made the RF and optical connections, you are ready to activate the receiver and make any necessary adjustments. Specifically, you will: • monitor the receiver using the front panel LEDs and test points, • adjust the optical input alarm threshold (optional), • check the RF output level, and • adjust the RF output level with the gain control. Tools and Equipment • shelf-mounted receiver installed in a link • system design map showing link loss numbers and forward transmitter output level • • • • • • 170 1310 nm or 1550 nm (ITU) optical signal source optical attenuator optical power meter voltmeter spectrum analyzer or signal strength meter non-conducting alignment tool 9 November 2001 Diamond Transport Receivers Monitoring and Adjusting the Receiver The front panel of the FRX and 2RRX receivers offer power indicators, gain control adjustments, optical input alarm threshold adjustments, and optical and RF test points. This section describes how to monitor and adjust a receiver using these controls, indicators, and test points. • The FRX offers a 6 dB adjustment range. • The 1RRX offers a 10 dB adjustment range. • The 2RRX offers a 10 dB adjustment range. Optical Alarm Threshold Adjust (THRESH) Use this adjustment to change the threshold set point from the factory-set value: • The FRX is factory-set at –8 dBm. • The 2RRX is factory-set at –18 dBm. NOTE The 1RRX-D2A does not require (or offer) optical alarm threshold adjustment. Optical Power Monitor Test Point (OPT TP) This input test point allows you to check the optical input power to the receiver. Use this in conjunction with the alarm threshold adjustment mentioned above. RF Output Test Point A –20 dB test point lets you check the RF output signal level. Use this test point to help you adjust the RF gain control. Diamond Transport Receivers 9 November 2001 171 Receiver Gain Control The gain control potentiometer on the receiver’s front panel allows you to adjust the RF output level. Turning the control to the right, or clockwise, will increase the output level; turning it to the left will decrease the level: Next Chapter Power Indicator (PWR) The two-color LED on the front panel of the receiver is green when the receiver is operating normally and red when the optical input power falls below the threshold. Setting the Optical Alarm Threshold (optional) Depending on the expected input level, you may want to adjust or disable the input alarm threshold. The instructions in this section apply to the FRX and 2RRX only; the 1RRX-D2A does not require (or offer) optical alarm threshold adjustment. Either an actual signal source or an alternate 1310 nm or 1550 nm optical signal source may be used to change factory settings for the Optical Alarm Threshold: • The FRX is factory-set at –8 dBm. • The 2RRX is factory-set at –18 dBm. If you will be using the actual input fiber as your signal source, test it with an optical power meter before adjusting optical alarming. Use the system design to determine the input level to a receiver, and set the threshold accordingly. Adjust optical alarming as follows: 1. Connect the optical signal source to an optical attenuator with connectors that match the one on the receiver. 2. Connect the other end of the optical attenuator's fiber to the receiver's connector. 3. Ensure that the power source for the Diamond Transport Shelf is connected. Power on your optical signal source. 4. Using a voltmeter, test the voltage (at OPT TP) and convert the voltage to dBm. 5. Adjust the optical attenuator until the voltage you read (and the equivalent dBm) is at the desired threshold level. Optical Receiver Input Test Point Conversions Calculate other optical levels as follows: • for 1310 nm: dBm=10 log VDC • for 1550 nm: dBm=10 log (VDC x0.869) 172 Optical Input Level Measured at 1310 nm Measured at 1550 nm +3 dBm +2 dBm +1 dBm 0 dBm –1 dBm –2 dBm –3 dBm –4 dBm –5 dBm –6 dBm +2.0 VDC +1.6 VDC +1.25 VDC +1.0 VDC +0.79 VDC +0.63 VDC +0.5 VDC +0.4 VDC +0.32 VDC +0.25 VDC +2.3 VDC +1.85 VDC +1.45 VDC +1.15 VDC +0.91 VDC +0.73 VDC +0.58 VDC +0.46 VDC +0.36 VDC +0.29 VDC 9 November 2001 Diamond Transport Receivers 6. Using a non-conducting alignment tool, turn the threshold adjust counterclockwise very slowly and carefully until the power LED for the receiver just turns red. Note: If you continue to turn the threshold adjust, or turn it too fast, the level will be inaccurate. 7. Power off the signal source and remove the optical attenuator. 8. Connect the actual signal source to the receiver. Disable the alarm function as follows: 1. Disconnect the optical input. The alarm LED turns red. 2. Turn the alarm threshold adjustment counterclockwise until the LED turns green. 3. Clean and reconnect the optical fiber. If the alarm is disabled, the alarm LED remains green. Diamond Transport Receivers 9 November 2001 173 Next Chapter If you disable the receiver’s alarm feature, the LED will remain green at all times. Before disabling the alarm, be sure that this is the condition you want your system to display. Receiver Disabling the Alarm Checking RF Output and Using the Gain Control Adjustment If you just finished adjusting your input alarm threshold (for FRX or 2RRX only), make sure to remove the optical attenuator and to connect the fiber. Turn off the optical transmitter that supplies input to the receiver. Check and, if necessary, adjust the RF output level as follows: 1. Ensure that the power source for the Diamond Transport Shelf is plugged in. 2. Power on the transmitter that supplies input to the receiver. NOTE: When checking output on the 2RRX, ensure that the toggle switch is set to the appropriate receiver. 3. Using a spectrum analyzer, test the RF output level at the –20 dB test point. 4. If the RF output is correct for your design, you are finished with this procedure. If you need to adjust the RF output, continue to step 5. 5. Using a non-conducting alignment tool, turn the gain control adjustment slightly to change the signal level. Note: Turning the gain control clockwise increases the signal level; turning it counterclockwise decreases the level. 6. Use the test point to re-check your output. Go back to step 5 if the level is not correct. IMPORTANT If checking the output of the 2RRX, repeat steps 2 through 6 for the second receiver. Make sure to change the position of the RF toggle switch. End of Procedure. 174 9 November 2001 Diamond Transport Receivers Removing a Module All links powered by the transmitter will go out of service when the transmitter is off. Remove a receiver from the Diamond Transport Shelf as follows: 1. Power OFF the transmitter that sends optical signals to the receiver. 2. Unplug the fiber from the front panel of the receiver. 4. Find the handle on the finned side of the module. Move the handle slightly to the left (around the locking mechanism); then, pull the handle toward you to disengage the connectors on the module’s rear panel. Slide the module out of the shelf. 5. When finished removing modules, return the fiber management tray to the upright position. The ball pins on the sides of the tray will engage with the shelf. Figure 84. Removing a Module Use the handle to release the receiver from the shelf. Diamond Transport Receivers 9 November 2001 175 Receiver CAUTION Do not pull on the optical connector bracket when removing a receiver module. Next Chapter 3. Pull down firmly on the fiber management tray to lower it. Be sure that there is enough slack in the fibers so that they will not be pulled tight. Specifications FRX Notes DT 801-FRX Optical Input Wavelength Range Optical Input Dynamic Range Fiber Type Connector Type (APC) Electrical Bandwidth RF Output Level (minimum) 700-TX or 800-TX with 77 NTSC channels @ –3 dBm into FRX 700-TX or 800-TX with 77 NTSC channels@ +3dBm into FRX 800-TX with 128 NTSC channels @ –3 dBm into FRX 800-TX with 128 NTSC channels, @ +3dBm into FRX Frequency Response Flatness—typical (maximum) Level Adjustment Range (from maximum RF output) Impedance Return Loss—typical (minimum) RF Test Point (relative to RF output level) Distortions Status Monitoring Received Optical Power Power Supply Indicator Received Optical Power Alarm Alarm Threshold Adjust Power Consumption (maximum) Environmental/Mechanical Operating Temperature Storage Temperature Dimensions (Height x Width x Depth) Weight a DT-803-FRX 1200 – 1600 –10 to +1 0 to +3 9/125/900 FC, SC, E2000 Units nm dBm microns 45 – 862 a, b a, b c c MHz ≥ +15 — — ≥ +23 ≥ +13 — — ≥ +21 ±0.5 (±0.75) 0 to –6 75 16 (15) –20 ±1.0 dBmV dBmV dBmV dBmV dB dB ohm dB dB 1.0 green LED red LED +1 to –8 13 mW/V d a, e f 32 to 122 0 to 50 –40 to +140 –40 to +60 4.75 x 1.81 x 14 12.1 x 4.6 x 35.6 3.5 1.59 dBm W °F °C °F °C in cm lb kg All specifications are subject to change without notice. a. These specifications apply when the FRX is fed by a 1310 nm transmitter. b. RF level obtained when using 700 or 800C series optical transmitters. RF level into transmitters for 77 NTSC channels is +15 dBmV per channel; RF level into transmitters for 128 NTSC channels is +13 dBmV. When using 800E and 800G series transmitters, the RF level into transmitters for 77 NTSC channels is +19 dBmV per channel; RF level into transmitters for 128 NTSC channels is +17 dBmV. c. From maximum RF level to 6 dB below maximum. d. The FRX contributes minimally to link distortions when used with PBN forward transmitters at recommended optical input power levels. e. For 801-FRX, with +1 dBm to –10 dBm dynamic range and ±0.5 dB and accuracy at 25°C, ±1.0 dB accuracy from 0°C to 50°C. For 803-FRX, with +3 dBm to 0 dBm dynamic range and ±0.5 dB and accuracy at 25°C, ±1.0 dB accuracy over 50°C. See “Optical Receiver Input Test Point Conversions” on page 172 f. The alarm threshold adjustment—factory-set to –8 dBm, ±1.0 dB—is located on the front panel. 176 9 November 2001 Diamond Transport Receivers DT-1RRX Notes DT-1RRX-D2A Units 1200 to 1600 nm –10 to –28 dBm 9/125/900 microns Optical Specifications Input Wavelength Range Optical Input Range Fiber Type Optical Connector Type (APC) SC or FC RF Outputs MHz +45 dBmV 5 to 42 MHz, 5 to 65 MHz ± 1.0 dB 5 to 48 MHz ± 1.5 dB ± 1.0 0 to -12 dB dB 75 Ω RF Output Level (maximum) Frequency Response Flatness (peak-to-valley) a b Frequency Response Slope (highest frequency to lowest) RF Level Adjustment Range (attenuation) c Impedance Return Loss 16 dB –20 40/20 (40/15) dB +5.5 volts 430 mA –5.5 volts 520 mA +24 volts 650 mA 22 W 12.1 x 4.6 x 35.6 4.75 x 1.81 x 14 1.59 3.5 cm in. kg lb. 0 to +60 +32 to +140 –40 to +60 –40 to +140 °C °F °C °F Directional Coupler Test Point (± 1 dB, switch A or B) Noise Power Ratio Link– typical (worst case) d Current Draw Power Consumption (maximum) Mechanical Specifications Dimensions (height x width x depth) Weight Environmental Specifications Operating (Ambient Room) Temperature Storage Temperature Specifications are subject to change without notice. This digital component works in conjunction with the TSOT-2AD/ITU digital return transmitter. a. b. c. d. Conditions: TSOT-2AD/ITU series transmitter with 35 MHz simulated digital loading. With TSOT-2AD/ITU digital return transmitter and a DT-1RRX-D2A digital return receiver. Potentiometer accessible from the front panel. See TSOT-2AD/ITU catalog section for performance. Diamond Transport Receivers 9 November 2001 177 Receiver 5 to 48 (filtered to 42) Next Chapter 2 Bandwidth 2RRX Notes 2RRX-Each Receiver Optical Input Wavelength Range Maximum Optical Input Fiber Type 1200 to 1600 nm +1 dBm 9/125/900 Optical Connector Type (APC) Units microns FC, SC, E2000 Electrical Bandwidth RF Output Level (minimum) Frequency Response Flatness (receiver only, peak-to-valley) Frequency Response Slope (highest frequency to lowest) Level Adjustment Range (minimum) a 5 to 200 MHz +20 dBmV 2 dB ± 2.0 dB 10 dB 75 ohms RF out level control at max. attenuation 14 dB RF out level control at min. attenuation 10 dB –20 dB 1.0 mW/V b Impedance Return Loss Directional Coupler Test Point (±1 dB, center conductor diameter 0.022” to 0.042”) Distortions Status Monitoring Received Optical Power Test Point Power Supply Indicator c d green LED Received Optical Power Alarm Indicator red LED e Alarm Threshold Adjust Power Consumption Environmental/Mechanical Operating (Ambient Room) Temperature Storage Temperature Dimensions (Height x Width x Depth) Weight +1 to –8 12.7 W 32 to 104 0 to 40 –40 to +140 –40 to +60 4.75 x 1.81 x 14 12.1 x 4.6 x 35.6 3.5 1.59 °F °C °F °C in. cm lb. kg All specifications are subject to change without notice. a. RF Output is measured with 200-TX series transmitter with 20 NTSC CW carriers at an optical input –4 dBm, or with NRT-WB2HP with two NTSC CW carriers at an optical input of –7.5 dBm, or with 7-ORT-WB1 with one NTSC CW carrier at an optical input –10 dBm. Return receiver is set for minimum gain. RF input for video –2 dBm; QPSK data –8 dBm. For applications requiring higher RF levels, use a 215-AMP return amplifier. b. Potentiometer accessible from the front panel. c. The 2RRX does not contribute to link distortions when used at recommended output levels. d. Accuracy ±0.5 dB over +1 to –10 dBm input power range. See “Optical Receiver Input Test Point Conversions” on page 172. e. The alarm threshold adjustment—factory-set at –18 dBm±1.0 dB—is located on the front panel. 178 9 November 2001 Diamond Transport Receivers