Diamond TX Series Manual

Table of Contents

Quick Links

Download this manual

Equipment Description ................................................................................................................................................ 79

Models .......................................................................................................................................................................... 82

Controls, Indicators, and Connectors ................................................................................................................. 84

DT-TX Series Transmitters .............................................................................................................................. 84

DT-QTX Controls and Connectors ........................................................................................................... 89

Functional Description ................................................................................................................................................. 91

RF Signals ..................................................................................................................................................................... 93

Optical Signals ........................................................................................................................................................... 94

Control Signals ......................................................................................................................................................... 94

DC Power .................................................................................................................................................................. 95

Automatic Shutdown .................................................................................................................................................... 96

Break in the Forward Link ................................................................................................................................. 97

Break in the Return Link ..................................................................................................................................... 97

Setting Up Automatic Shutdown .................................................................................................................. 98

Installation ......................................................................................................................................................................... 100

Before You Start .................................................................................................................................................. 100

Tools and Equipment ........................................................................................................................................ 101

Installing a Transmitter in the DT Shelf ................................................................................................... 102

Checking Optical Output ................................................................................................................................ 105

Checking Laser Bias Current ......................................................................................................................... 108

Connecting the Optical Fiber ....................................................................................................................... 109

Connecting the RF Signal ................................................................................................................................ 113

Setting Up the Transmitter ..................................................................................................................................... 114

Tools and Equipment ........................................................................................................................................ 114

Activating the Transmitter .............................................................................................................................. 115

Setting the Transmitter for Manual Mode (DT-TX Series) ........................................................ 118

Setting Up AGC ................................................................................................................................................... 120

Specifications ................................................................................................................................................................... 125

AM Optical Link Performance .............................................................................................................................. 127

Transmitters

TX and QTX SERIES

TRANSMITTERS

Contents

9 November 2001

Table of Contents

Summary of Contents for Diamond TX Series

Page 1: Table Of Contents
Setting Up the Transmitter ............................. 114 Tools and Equipment ............................114 Activating the Transmitter ..........................115 Setting the Transmitter for Manual Mode (DT-TX Series) ............118 Setting Up AGC ..............................120 Specifications ................................... 125 AM Optical Link Performance ..........................127...
Page 2 9 November 2001 Transmitters...
Page 3: Equipment Description
Figure 35. Diamond™Transport Transmitter Module All DT-TX and DT-QTX series transmitters fit into the DT-Shelf ’s universal slots. TX series transmitters transmit analog broadband signals over optical fiber. QTX series transmitters are part of Philips’ 1550 nm Analog/Digital Overlay Transport System.
Page 4 (NIC) on the Diamond Transport shelf; the NIC serves as the interface with local or remote monitoring systems. The 800E-TX and 800G-TX series transmitters offer high isolation on the auxiliary RF input to facilitate insertion of local targeted video channels.
Page 5 The 200-TX, 700-TX, and 800C-TX series transmitters use the AGC/MAN switch to select automatic or manual gain control mode. The 800E-TX and 800G-TX transmitters offer an additional setting for customer-set AGC (AGC active with customer-optimized OMI).
Page 6: Models
To support local video injection, the 800E-TX and 800G-TX transmitter series offer higher isolation between the auxiliary and main inputs than the 800C-TX series offers. When combined with the DT-SRS sub-rack splitter, the combined isolation (between transmitters) of the locally injected channels is ≥...
Page 7 210-QTX and 810-QTX QAM Transmitters DT- _ _ _-QTX _ _ - _____ Diamond Transport System Bandwidth, Output Power 210 = 200 MHz, 10 dBm 810 = 870 MHz, 10 dBm QAM Transmitter International Telecommunications Union (ITU) Channel Optical Connector Options...
Page 8: Controls, Indicators, And Connectors
Transmitters installation and use of TX series transmitters. Connectors on the rear of the transmitter modules plug into the Diamond Transport shelf. Cabling is connected to the shelf backplane, not directly to the module. Figure 36. Standardized Controls, Indicators, and...
Page 9 Edge connector. Connects to Diamond Transport shelf backplane. Carries control information into and out of the transmitter module. Main RF Input Connects to Diamond Transport shelf backplane. Allows primary RF signal to enter the transmitter. Auxiliary RF Input Connects to Diamond Transport shelf backplane. Allows auxiliary RF signal to enter the transmitter.
Page 10 LED Status Indicators Use the indicators, controls, and test points on the front panel of the module to monitor transmitter performance. Label Indicates State Green Transmitter is in AGC mode, and its RF drive level has been automatically adjusted to match the factory-set AGC reference.
Page 11 Test Points and Controls Test points and controls are mounted on the front panel for easy access. Label indicates AGC options and toggle positions. CUST FACT Label Description Key Switch Activates / deactivates laser. Allows the operator to “lock out” (by removing the key) the transmitter for maintenance.
Page 12 AGC Labeling and Toggle 200-TX, 700-TX, and 800C-TX Positions The 200-TX, 700-TX, and 800C-TX series transmitters offer two settings, with toggle positions indicated by the label above the toggle switch: Toggle UP to activate AGC at factory-set level. Toggle DOWN for manual mode.
Page 13: Dt-Qtx Controls And Connectors
Connectors installation and use of QTX series transmitters. Connectors on the rear of the transmitter modules plug into the Diamond Transport shelf. Cabling is connected to the shelf backplane, not directly to the module Figure 37. DT-QTX Controls and Connectors DT-810-QTX fiber-length setting may be optimized through the front panel.
Page 14 Edge connector. Connects to Diamond Transport shelf backplane. Carries control information into and out of the transmitter module. Main RF Input Connects to Diamond Transport shelf backplane. Allows RF signal to enter the transmitter. SW3 & SW2 10-position switches used to configure the transmitter for Automatic Shutdown.
Page 15: Functional Description
Functional Description All TX series plug-in transmitters convert radio frequency (RF) input into an optical signal and process RF, optical, control, and DC power signals. Figure 38. DT 200-TX, 700-TX, and 800C-TX Functions All Diamond Transport transmitters process RF, optical, control, and DC power signals.
Page 16 The DT-QTX facilitates the use of dense wave division multiplexing (DWDM) for digital services such as high-speed internet access, telephony, and video-on-demand. Each transmitter’s laser is tuned to a specific International Telecommunication Union (ITU) channel wavelength. Figure 40. DT-QTX Functions Each transmitter’s laser is tuned to a specific ITU channel and is factory-configured for fiber length at 256 QAM.
Page 17: Rf Signals
Post-amplifier Hybrid: A post-amplifier hybrid amplifies the RF signals. Gain Control Circuitry: The 800E-TX and 800G-TX series transmitters offer three AGC modes: Customer AGC (AGC On with customer-optimized OMI), Factory AGC (ACG On with factory-set OMI), and Manual (AGC Off). Other DT-TX series transmitters offer Manual and Factory AGC modes only.
Page 18: Optical Signals
AGC AND PROOFING WITH CW CARRIERS Do not use AGC when proofing transmitters that operate with CW carriers. When CW carriers are used, the AGC circuit reduces gain by about 2.0 dB, which reduces a link’s C/N by 2.0 dB from what would be achieved with modulated carriers.
Page 19: Dc Power
Communications Connector: The communications connector collects control information, from this closed loop and others inside the transmitter module, and sends it through an edge connector on the transmitter’s rear panel to the shelf. When installed, the optional network interface card (NIC) enables local and remote monitoring of transmitter performance.
Page 20: Automatic Shutdown
’s manual shutdown or Automatic Shutdown is not connector on the Diamond Transport shelf ’s back panel. used. The logic signal passes through a ribbon cable to the correct shelf and then travels through the shelf ’s back...
Page 21: Break In The Forward Link
Break in the Forward When the forward link is broken, the following events take Link place: • The 2RRX has a restart cycle The NOR in the node detects the loss of light and shuts that attempts to reactivate down the return transmitter (NRT). the link once it is restored.
Page 22: Setting Up Automatic Shutdown
Setting Up Automatic To set a forward transmitter and return receiver (or return Shutdown transmitter and forward receiver) in the same loop to use a specific communication line for automatic shutdown, set switches (see Figure 43) on each module to the same address.
Page 23 See the Receivers section of this Diamond Transport manual for more information on setting up receivers for Automatic Shutdown.
Page 24: Installation
Review procedures before beginning this installation. Observe the following cautions: • Do not disturb previously installed modules in the Diamond Transport Shelf, especially if there are fibers in place. • Do not twist, bend, or pinch fibers when installing and removing modules.
Page 25: Tools And Equipment
Tools and Equipment Hardware • Diamond Transport TX or QTX series transmitter(s) • Diamond Transport Shelf mounted into a rack • Power Supply Unit Tools • small, non-conducting blade-type alignment tool • Phillips screwdrivers Meters • optical power meter •...
Page 26: Installing A Transmitter In The Dt Shelf
Installing a Transmitter All Diamond Transport transmitter modules (TX and QTX in the DT Shelf series) are installed in the same way, regardless of series number. WARNING The transmitter is powered as soon as it is plugged into a powered shelf. Be sure the key switch is off before installing the transmitter.
Page 27 Turn off the key switch before 3. Make sure the transmitter’s key switch is off. Then, hold plugging the transmitter into a the module with the fins on the left side, and slide the powered shelf. module part way into the slot. Verify that the module’s connectors line up with those on the shelf.
Page 28 4. Pull the transmitter’s handle to the left (to clear the locking tab) and then forward, toward you. Figure 46. Locking/Release Mechanism Pull handle left around the locking mechanism and then forward. 5. Slide the module into the shelf until the base of the handle makes contact with the shelf.
Page 29: Checking Optical Output
Use an optical power meter with a connector that matches the one under the transmitter’s shield. CAUTION The bulkhead and optical connector on a Diamond Transport transmitter are covered by a protective shield. To make connections or to clean connectors, you must remove the two screws holding the shield in place and then remove the shield.
Page 30 Plug in the optical power meter to measure the optical output power of the transmitter. CAUTION The bulkhead and optical connector on a Diamond Transport transmitter are covered by a protective shield. To make connections or to clean connectors, you must remove the two screws holding the shield in place and then remove the shield.
Page 31 Nominal Optical Output Power* Model Nominal Optical Output Power** 210-TX & 210A-TX 6 dBm 212-TX& 212A-TX 8 dBm 214-TX& 214A-TX 10 dBm 705-TX & 805C/E/G-TX 3 dBm 706-TX & 806C/E/G-TX 4 dBm 707-TX & 807C/E/G-TX 5 dBm 709-TX & 809C/E/G-TX 6 dBm 710-TX &...
Page 32: Checking Laser Bias Current
Checking Laser Bias Monitor and record laser bias current regularly to find out Current how much variability is normal for your transmitter. (For example, a 0.1 - 0.2 mA change per month may be normal for your transmitter.) Check any change that is greater than the typical laser current progression for your module.
Page 33: Connecting The Optical Fiber
Connecting the Optical Connect the fiber to a shelf-mounted Diamond Transport Fiber transmitter with a compatible, high-quality optical connector. WARNING Before you begin, make sure the transmitter’s key switch is off. Even when the transmitter is not powered, laser beams may be present in the optical cable.
Page 34 Connect the optical fiber as follows: 1. Set the transmitter’s key switch in the OFF position. CAUTION The bulkhead and optical connector on a Diamond Transport transmitter are covered by a protective shield. To make connections or to clean connectors, you must remove the two screws holding the shield in place and then remove the shield.
Page 35 5. Align the key on the fiber’s connector with the bulkhead’s slot, and slide the connector into the bulkhead until it locks. For an FC-type, screw the connector to tighten it. (See Figure 50.) FC Bulkhead FC Connector SC Bulkhead SC Connector Figure 50.
Page 36 Figure 51. Fiber Routing One possible fiber-routing method routes all fiber in the same direction. Fiber may also be routed to both right and left as long as fibers do not cross over one another. 8. Return the fiber-management tray to its upright position. Do not twist or pinch the fiber.
Page 37: Connecting The Rf Signal
Connecting the RF Signal RF signal level that is too high 1. Use a spectrum analyzer to verify that the RF signal level or too low causes poor (from the input cable) matches the level required by the performance. system design. 2.
Page 38: Setting Up The Transmitter
Setting Up the Transmitter Once you’ve installed the Diamond Transport transmitter into the shelf and made the RF and optical connections, you are ready to set up the transmitter by doing the following: • activating the laser • setting the transmitter in manual or AGC mode...
Page 39: Activating The Transmitter
Activating the Activate the transmitter as follows: Transmitter 1. Make sure that transmitter’s activation key is in the off position. 2. If you haven’t done so already, connect the shelf ’s power supply to its power source. 3. Check the condition of the PWR LED. •...
Page 40 4. Activate the laser by turning the key clockwise. The PWR LED glows steadily and the yellow LASER LED lights. If the LASER LED does not light and stay lit, check the following: • the shield is in place, • the bottom screw holding it is tightened, and •...
Page 41 Figure 54. LASER Status To activate the laser, turn the key clockwise. Proceed to Setting the Transmitter for Manual Mode. Transmitters 9 November 2001...
Page 42 In manual mode, you can set the RF drive level to the laser for Manual Mode using the manual gain control. (DT -TX Series) DT-QTX transmitters do not If you plan to use AGC, go to “Setting Up AGC” on offer AGC.
Page 43 4. With a small, non-conducting alignment tool, adjust the manual gain control until the levels measured at the test point are 20 dB below the RF input level specification. Turn the control clockwise to increase the drive level; turn the control counterclockwise to decrease the drive level. The manual gain control lets you adjust the RF drive level by ±...
Page 44: Setting The Transmitter For Manual Mode (Dt-Tx Series)
AGC circuitry. input level window = -10•log (# of channels/rated channel load) Channel TX Series Nominal AGC Window Loading Input Level...
Page 45 Using the Customer-Set AGC Function (800E-TX and 800G-TX) In cases where the transmitter application is significantly different from the application for which it is designed, performance may be optimized through the customer-set AGC option on 800E-TX and 800G-TX transmitters. Set AGC on transmitters with this capability as follows: 1.
Page 46 Using the Factory-Set AGC Function NOTE Do not use AGC when proofing transmitters that operate with CW carriers. The AGC reference level is factory-set for modulated carriers. For constant wave (CW) carriers, the AGC detected power is 2.0 dB higher, and the AGC adjusts the RF drive downward to compensate.
Page 47 Adjusting the DT -QTX Fiber-Length Setting (810-QTX only) The 810-QTX may be used for any link up to 150 km. Adjust the 810-QTX for link length as follows: It is not necessary to connect 1. Install the 810-QTX and supply power. fiber to the 810-QTX before adjusting the fiber-length 2.
Page 48 6. Release the module from the shelf by moving the handle slightly to the left (around the locking mechanism), and then pulling it towards you. Use the handle to pull the module out of the shelf. Figure 57. Lock/Release Mechanism Move handle around locking mechanism;...
Page 49: Specifications
Specifications 200-TX Series Optical Transmitters Notes 200-TX Units Bandwidth 5–200 Optical Wavelength (all series) 1310 (± 10) Optical Output Power (all series) 210-TX 6 (± 0.25) 212-TX 8 (± 0.25) 214-TX 10 (± 0.50) Safety Power Shutdown (all series) RF Input Level, Main (20 channels) 18 (±...
Page 50 700-TX and 800C/E/G-TX Series Optical Transmitters Notes 700-TX 800C-TX 800E-TX 800G-TX Units Bandwidth Operational 45–750 45–862 45–862 45–862 Analog 45–550 45–862 45–650 45–862 Optical Wavelength (all series) 1310 (± 10) Optical Output Power (± 0.25 dB)—all series 705-TX or 805*-TX...
Page 51: Am Optical Link Performance
AM Optical Link Performance 5–200 MHz, 20 NTSC Channels 210-TX or 212-TX or 214-TX or 210A-TX 212A-TX 214A-TX Optical Output Power (dB) Fiber Length (km) Carrier-to-Noise (in dB) for links carrying 20 analog Optical Loss Budget channels 5–200 MHz over a single fiber when (dB) served by the listed 2**-TX transmitters —...
Page 52 ≥ 85% of production units tested over Corning SMF-28 fiber (or equivalent). For minimum CSO and CTB, subtract 2 dB from typical. • Typical optical input power is –3 dBm for 709-TX through 715-TX series transmitters and –2 dBm for 705-TX through 707-TX series transmitters.
Page 53 ≥ 85% of production units tested over Corning SMF-28 fiber (or equivalent). For minimum CSO and CTB, subtract 2 dB from typical. • Typical optical input power is –3 dBm for 809C- or 809G-TX through 815C- or 815G-TX series transmitters and –2 dBm for 805C- or 805G-TX through 807C- or 807G-TX series transmitters.
Page 54 ≥ 85% of production units tested over Corning SMF-28 fiber (or equivalent). For minimum CSO and CTB, subtract 1 dB from typical. • Typical optical input power is –3 dBm for 809C- or 809G-TX through 815C- or 815G-TX series transmitters and –2 dBm for 805C- or 805G-TX through 807C- or 807G-TX series transmitters.
Page 55 807E-TX series transmitters. • Performance to a node is specified from the transmitter’s RF main input through receiver RF output. In the Diamond Net optical station, this is the NOR module. To determine link performance all the way to the housing outputs, add noise and distortion contributions of additional amplifier stages.
Page 56 807E-TX series transmitters. • Performance to a node is specified from the transmitter’s RF main input through receiver RF output. In the Diamond Net optical station, this is the NOR module. To determine link performance all the way to the housing outputs, add noise and distortion contributions of additional amplifier stages.
Page 57 DT -QTX Series QAM Transmitters DT-210-QTX DT-810-QTX Units Bandwidth 5 to 200 400 to 870 Optical Wavelength 1549 to 1561 1530 to 1561 Wavelength Deviation Drift (maximum) 0.15 0.15 Offset (maximum) 0.01 0.01 Optical Output Power (± 0.25 dB) Safety Power Shutdown Input RF Power —...
Page 58 DT -QTX Series QAM Transmitters (Cont.) DT-210-QTX DT-810-QTX Units Mechanical Specifications Dimensions (height x width x depth) 12.1 x 4.6 x 41.3 12.1 x 4.6 x 41.3 (4.75 x 1.81 x 16.25) (4.75 x 1.81 x 16.25) (in.) RF Input Connector F-type F-type Optical Connector...
Page 59 Noise-Power Ratio (NPR) Charts (for the DT -210-QTX) Figure 58. NPR–No EDFA NPR curve for a return transmitter where the input to the receiver is –12 dBm, with no EDFA in cascade for a standard 42 MHz return loading for a 70 km link. Figure 59.
Page 60 9 November 2001 Transmitters...

This manual is also suitable for:

Qtx series Dt-210-qtx Dt-810-qtx