Motorola Starline SG 2000 Скачать руководство пользователя страница 86 | Manualshive

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5 - 2 2

O p e r a t i o n

SG 20 00 Ins tal la tion and O pera tion M anua l

D S -S G2 -D RT -2X /A D ig ita l Re tu rn T ran smitter

The DS-SG2-DRT-2X/A is an SG2 return transmitter that digitizes two independent analog
5 MHz-42 MHz return-path signals to produce two 1.25 Gbps data streams. These two data streams
are then multiplexed to create a 2.5 Gbps data stream. This data stream is then routed to a digital
laser for transmission to a corresponding digital return receiver.

The transmitter can be configured with a digital laser wavelength that is applicable to the required
link length. An APC system regulates the optical output power from the laser. Two user-accessible
input level-control adjustments enable you to independently adjust the transmitter input levels

+

2 to

−

13 dB from an input level of 15 dBmV. All transmitter status-monitor information is available at

the digital return receiver.

To facilitate easy upgrades, the DS-SG2-DRT-2X/A fits the same footprint and has the same set-up
levels as the analog return transmitters.

Figure 5-23 illustrates a block diagram of the DS-SG2-DRT-2X/A:

F i g u r e 5 - 2 3
D S - S G 2 - D R T - 2 X / A

Serializer

Transmit

signal

processing

logic

A/D

converter

RF

XFMR

XO

XO

Anti-

aliasing

LPF

Return

band RF

5-42 MHz

CATV

gain block

A/D

converter

RF

XFMR

Anti-

aliasing

LPF

Return

band RF

5-42 MHz

CATV

gain block

Digital

lightwave to

SG2 output

Optical transmitter module

Serial bit

stream

@2.5 Gbps

Figure 5-24 illustrates the DS-SG2-DRT-2X/A and attached cable:

F i g u r e 5 - 2 4
D S - S G 2 - D R T - 2 X / A

INPUT

A

INPUT

B

STATUS DS-SG2-DRT-2X/A

1310 DFB

RF

INPUT

B

SG2000

Digital Transmitter

DANG

E

R

Test

Point

A

Test

Point

B

You can gain access to test point A through the transmitter test cable MCX-F (DS-SG2-DRT-TC,
P/N 476803-001).

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Содержание Starline SG 2000

Страница 1: ...S G 2 0 0 0 T e l e c o m m u n i c a t i o n s O p t i c a l N o d e I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l 4 2 7 IN 6 S T A R L I N E ...

Страница 2: ...icient strength to cause serious bodily injury when touched The symbol may also appear on schematics The exclamation point within an equilateral triangle is intended to alert the user to the presence of important installation servicing and operating instructions in the documents accompanying the equipment For continued protection against fire replace all fuses only with fuses having the same elect...

Страница 3: ... 3 Power Supply 2 4 Network Monitoring 2 5 Configuration 2 5 Forward Path 2 7 SG2 LR Receiver 2 9 Analog Return Path 2 10 Analog Return Transmitters 2 10 Digital Return Path 2 12 DS SG2 DRT A 2 12 DS SG2 DRT 2X A 2 13 Level Control 2 14 Options and Accessories 2 14 Gain Selection 2 16 Tilt Selection 2 18 Section 3 Bench Setup Powering the Node 3 3 Power Supply Settings 3 5 Single Power Supply or C...

Страница 4: ...ng Fiber 4 1 Strand Wire Mounting 4 3 Coaxial Cables 4 5 Fiber Cables 4 5 Section 5 Operation Forward Path RF Configuration 5 1 Single Receiver Mode 5 1 Redundant Receiver Mode 5 2 Broadband Narrowcast Mode 5 2 AB Override Functionality 5 3 B Override 5 3 A Override 5 4 Status Monitor Manual Control Operation 5 4 Analog Return Path RF Configuration 5 5 Digital Return Path RF Configuration 5 7 SG 2...

Страница 5: ...2 Port locations 2 2 Figure 2 3 Housing gaskets 2 3 Figure 2 4 SG2 PS2 power supply 2 4 Figure 2 5 Configuration notation 2 6 Figure 2 6 Signal flow diagram 2 7 Figure 2 7 SG2 LR receiver functional diagram 2 9 Figure 2 8 SG2 transmitter block diagram 2 11 Figure 2 9 Optical input versus 750 MHz gain 2 16 Figure 2 10 Optical input versus 870 MHz gain 2 17 Figure 2 11 Relative level dB versus 750 M...

Страница 6: ...ounting bracket rear and side views 4 4 Figure 4 4 Center conductor length 4 5 Figure 4 5 Housing lid and fiber spool tray 4 6 Figure 4 6 Fiber spool tray 4 6 Figure 5 1 Single receiver 5 1 Figure 5 2 Redundant receiver 5 2 Figure 5 3 Broadband narrowcast 5 2 Figure 5 4 B override 5 3 Figure 5 5 A override 5 4 Figure 5 6 Status monitor MCB operation 5 4 Figure 5 7 Redundant return 5 5 Figure 5 8 S...

Страница 7: ...ut levels 5 11 Table 5 3 SG2 IFPT features 5 14 Table 5 4 SG2 FPT features 5 15 Table 5 5 SG2 DFBT features 5 16 Table 5 6 SG2 DFBT 3 features 5 18 Table 5 7 SG2 EIFPT features 5 19 Table 5 8 DS SG2 DRT A features 5 21 Table 5 9 DS SG2 DRT 2X A features 5 23 Table 5 10 Reporting and control provisions 5 26 Table 5 11 MCB user interface settings 5 27 Table A 1 SG 2000 optical characteristics A 1 Ta...

Страница 8: ...00 Installation and Operation Manual Table A 13 Current requirements A 7 Table A 14 SG2 75 performance with 77 channels A 8 Table A 15 SG2 87 performance with 94 channels A 8 Table A 16 SG2 87 performance with 110 channels A 8 ...

Страница 9: ...he demand increases for optical links that carry the signal further into the transport system These systems require additional features and functionality such as digital compression and alternate access at significantly lower costs Fully configured the SG 2000 supports these next generation telecommunication networks It also supports a variety of single and two way broadband network applications s...

Страница 10: ...dB 20dB 20dB 20dB L L PORT 1 PORT 2 PORT 3 PORT 4 JXP 1 JXP 1 JXP 2 JXP 2 JXP 4 JXP 4 MDR ADU ADU ADU IS IS TCU MAN FRB RPM STATUS MONITOR OFF ON SG2 VARILOSSER JXP 3 JXP 3 FWD EQ FWD EQ FWD EQ FWD EQ 24 V DC IS IS Optical Node Base Lid Features include 52 through 870 MHz forward passband 5 through 40 MHz return standard other splits are available see Appendix A Specifications Optical receivers up...

Страница 11: ...s that are recommended before installation Section 4 Installation provides instructions for installing the SG 2000 in a distribution system Section 5 Operation provides information governing the use of various options and applications required by your system Appendix A Specifications provides technical specifications for the SG 2000 node and major options Appendix B Torque Specifications provides ...

Страница 12: ...ific model the complete model number is given Italic type Denotes a displayed variable a variable that you must type or is used for emphasis If You Need Help If you need assistance while working with the SG 2000 contact the Motorola Technical Response Center TRC Inside the U S 1 888 944 HELP 1 888 944 4357 Outside the U S 215 323 0044 Online http www motorola com broadband click HTML Modem Version...

Страница 13: ...rom 7 AM to 4 PM Pacific Time Monday through Friday When calling from outside the United States use the appropriate international access code and then call 526 314 1000 extension 3194 to contact the Repair Facility When shipping equipment for repair follow these steps 1 Pack the unit securely 2 Enclose a note describing the exact problem 3 Enclose a copy of the invoice that verifies the warranty s...

Страница 14: ...ed heat Figure 2 1 illustrates the housing dimensions of the SG 2000 optical node Figure 2 1 SG 2000 housing dimensions front and side view 12 25 21 60 10 99 3 4 OUT 6 3 7 8 2 1 4 5 For strand mounting the optional bracket must be used If the node is configured for strand mounting the bracket is installed on the node at the factory The bracket provides two clamps located 16 7 8 inches apart that s...

Страница 15: ...limited to 750 inches at ports 1 and 2 and or ports 3 and 4 These ports are protected by factory inserted threaded plugs or plastic cap plugs which are discarded when the cable connectors are installed Port 2 is used only for connection to an external 60 Vac or 90 Vac power supply Port 4 is unused Figure 2 2 illustrates a front and end view of the housing and port locations Figure 2 2 Port locatio...

Страница 16: ...U H H L 20dB L 20dB 20dB 20dB 20dB L L PORT 1 PORT 2 PORT 3 PORT 4 JXP 1 JXP 1 JXP 2 JXP 2 JXP 4 JXP 4 MDR ADU ADU ADU IS IS TCU MAN FRB RPM STATUS MONITOR OFF ON SG2 VARILOSSER JXP 3 JXP 3 FWD EQ FWD EQ FWD EQ FWD EQ 24 V DC IS IS Optical Node Weather gasket silicone rubber RF gasket woven wire The gaskets provide efficient ground continuity RF shielding and weather protection Both gaskets must b...

Страница 17: ...against surge currents on the ac line The same protector is used for both supplies unless the split ac feed option is implemented then the secondary or redundant power supply is protected by a conventional heavy duty gas discharge tube The 20 ampere fuses are installed at the factory to provide power passing to additional amplifiers Section 3 Bench Setup discusses fusing options that are also diag...

Страница 18: ...2 link LIFELINE software enables the operator to view measurements taken by the transponders LL SG2 Field Installed Transponders Installed in individual field components this unit interfaces with the CU at the headend It reports such parameters as forward amplifier dc current draw ac and dc voltage temperature automatic drive unit ADU drive voltage management and control of RF ingress switching an...

Страница 19: ...ancy Key 23 24 25 26 27 28 29 30 DS SG2 DRT A 1310 DFB SC w redundancy DS SG2 DRT A 1550 DFB SC w redundancy DS SG2 DRT A 1510c DFB SC w redundancy DS SG2 DRT A 1530c DFB SC w redundancy DS SG2 DRT A 1550c DFB SC w redundancy DS SG2 DRT A 1570c DFB SC w redundancy DS SG2 DRT 2x A 1470c DFB SC w split return DS SG2 DRT 2x A 1490c DFB SC w split return Return Path Configurations Digital Return DS SG...

Страница 20: ... a diagram of the signal flow path through the SG 2000 Figure 2 6 Signal flow diagram SG2 FJB P forward jumper board Data lines Splitter Splitter Splitter TP TP TP TP TP JXP JXP JXP Receiver B Receiver C Receiver A SG2 FBS forward band split MDR Attenuator SG2 FRB POT ADU JXP 18 5 Amplifier JXP EQ Amplifier SG2 lid SG2 RF chassis 24 VDC 5 VDC ACV JXP L H Diplex filter TP L H Diplex filter TP L H D...

Страница 21: ...MDR circuit board provides a fixed linear equalizer for either 750 MHz or 870 MHz This equalizer comes in numerous values to support various levels of output tilt The MDR board also compensates for the low frequency roll off inherent in plug in diplexers A driver hybrid amplifies the signal to a sufficiently high level to feed up to four power doubling output stages These output hybrids can be eit...

Страница 22: ... This provides excellent isolation improved reliability and reduced power consumption when the receiver is used in redundant applications Figure 2 7 illustrates a functional block diagram of the SG2 LR receiver Figure 2 7 SG2 LR receiver functional diagram Module enable RF output Optical input Hybrid current sense signal 10V A Hybrid current test point 1 0 V A Optical power sense signal 1 V mW Opt...

Страница 23: ... identifies and describes the five analog return transmitters Table 2 1 Analog return transmitters Model Description SG2 IFPT Uses an isolated uncooled Fabry Perot laser operating at 400 µW It carries a full 35 MHz of digital data or up to two video channels SG2 FPT Uses a non isolated uncooled Fabry Perot laser operating at 400 µW It carries a full 35 MHz of digital data or up to two video channe...

Страница 24: ... 8 illustrates a functional block diagram of the SG2 transmitter Figure 2 8 SG2 transmitter block diagram RF input Thermal compensation JXP factory calibration only Laser bias control Fiber output Laser current test Hybrid current test Optical power test Laser diode module ...

Страница 25: ... SG2 DRT A 1570c DFB DS SG2 DRT 2X A 1570c DFB DS SG2 DRT A 1590 DFB DS SG2 DRT 2X A 1590 DFB DS SG2 DRT A 1610 DFB DS SG2 DRT 2X A 1610 DFB 1 2X in the model number denotes time division multiplexing TDM 2 c in the model number denotes coarse wave division multiplexing CWDM To prepare for an anticipated increase in return traffic provisioning for CWDM is built into the transmitters The CWDM optio...

Страница 26: ...mitters the node must also be configured with the SG2 Return Path Module Split SG2 RPM S Return signals from two of the four node ports are fed to one RF input of the transmitter while the remaining two return signals are fed to the second RF input The signal paths for both inputs are explained in more detail in Section 5 Operation Signal levels are adjusted in each return path using Model JXP att...

Страница 27: ...accessories for the SG 2000 Table 2 3 Options and accessories Model Description Function ADU Automatic drive unit This option automatically adjusts gain by monitoring changes in the level of the selected pilot carrier Either an ADU or TCU must be installed TCU Thermal control unit The TCU controls amplifier gain for changes in hybrid gain at the sensed temperature JXP A Fixed attenuator Attenuator...

Страница 28: ...crements from 2 dB through 6 dB SG2 FE 870 Forward equalizers Used to increase output tilt at one or more ports in an 870 MHz system They are available in 1 dB increments from 2 dB through 6 dB SG2 IS Ingress switch This switch enables the operator to troubleshoot without shutting down the return path It requires the use of either the LL SG2 or the SG2 MCB SG2 LR Lightwave receiver This receiver c...

Страница 29: ...he intersection lies between the lo gain limit and hi gain limit lines then choose the high gain option Operation at a combination of input and output levels below and to the right of the hi gain limit line is not possible Figure 2 9 illustrates the gain option selection chart for 750 MHz Figure 2 9 Optical input versus 750 MHz gain 5 38 40 42 44 46 48 50 52 3 4 2 1 0 1 2 Bridger output level dBmV...

Страница 30: ...ure 2 10 gives the output level at 870 MHz For a system loaded with analog channels to 750 MHz the actual level at 750 MHz is 1 7 dB lower with the standard overall tilt of 11 5 dB For the low tilt of 9 0 dB the reduction at 750 MHz is 13 dB For the high tilt of 14 dB the 750 MHz level is 2 1 dB lower than at 870 MHz For a system loaded with analog channels to 650 MHz the actual level at 650 MHz i...

Страница 31: ...nels Use the corresponding bandwidth and channel loading chart to determine the preferred tilt either low standard or high Figure 2 11 illustrates the tilt selection chart for 750 MHz bandwidth and 77 channel load Figure 2 11 Relative level dB versus 750 MHz slope 77 channels 3 50 150 250 350 450 550 650 750 1 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Frequency MHz Relative level dB SG2 750 MHz Slope C...

Страница 32: ...ction chart for 870 MHz bandwidth and 94 channel load Figure 2 12 Relative level dB versus 870 MHz slope 94 channels 3 4 50 150 250 350 450 550 650 750 870 1 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Frequency MHz Relative level dB SG2 870 MHz Slope Chart 94 Analog Channels 220 MHz Digital High Standard Low ...

Страница 33: ...tion chart for 870 MHz bandwidth and 110 channel load Figure 2 13 Relative level dB versus 870 MHz slope 110 channels 3 50 150 250 350 450 550 650 750 870 1 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Frequency MHz Relative level dB SG2 870 MHz Slope Chart 110 Analog Channels 120 MHz Digital High Standard Low ...

Страница 34: ...g optical modules and power supplies on SG 2000s equipped with redundant supplies is possible with the node powered and operational Figure 3 1 illustrates the upper half housing or lid of the SG 2000 and identifies the location of all major components Figure 3 1 SG 2000 lid showing major components Power supply 1 Power supply 2 Optical transmitter B Optical transmitter A Optical receiver C Optical...

Страница 35: ...DJ Drive unit selector AUTO MAN SG2 FE Diplex filter Output hybrid port 3 Ingress switch or JXP2A Ingress switch or JXP2A Output hybrid port 1 SG2 FE Forward pad MDR board Driver hybrid Return pads Diplex filter Output hybrid port 4 Forward pad SG2 FE Optics to RF cable interfaces ADU level control ADU ADJ Return pad Diplex filter Ingress switches or JXP2A s Diplex filter SM ADU pad Output hybrid ...

Страница 36: ...wer supply wiring and can also be used to disconnect ac power from the power supply In addition to providing overcurrent protection fuse locations also determine the paths for ac bypassing through the housing Figure 3 3 diagrams fuse configurations for ac and dc powering Figure 3 3 Fuse configuration RF chassis Housing IN AC port Port 1 Port 2 Port 3 Port 1 F3 20 Amp F1 20 Amp F2 20 Amp F5 20 Amp ...

Страница 37: ...dc Auto plug in fast blow F6 This fuse passes ac to from port 3 20 A 32 Vdc Auto plug in fast blow F7 This jumper ties two sections of the ac power bus together thus delivering ac power to both sides of the node It should be removed only when dual power supplies are fed from separate ac sources Jumper Auto plug in shunt F8 The 5V circuit includes Fuse F8 which protects the lid and RF board under s...

Страница 38: ... MDR ADU ADU ADU IS IS TCU MAN FRB RPM STATUS MONITOR OFF ON SG2 VARILOSSER JXP 3 JXP 3 FWD EQ FWD EQ FWD EQ FWD EQ 24 V DC IS IS Optical Node F1 F4 F3 F5 F7 F6 F2 F8 F9 The dc power supply 24 V circuit includes fuse F9 rated at 10 A the 5 V circuit includes F8 which is rated at 5 A Power Supply Settings You can power the SG 2000 from either 60 Vac or 90 Vac system supplies The unit is shipped fro...

Страница 39: ... on the RF chassis indicate the overall health of the nodes dc power bus The power supply is factory calibrated for 24 V and should not need output voltage adjustment Power supply adjustment R51 is available but should be used only by qualified personnel When dual supplies are used the supply with the lower output voltage sets the output voltage of both supplies Adjusting R51 on the other supply a...

Страница 40: ...e horizontal position strand mount installation Figure 3 7 illustrates this position Fuse jumper F7 must also be removed The primary ac power feed now connects to power supply l and an independent secondary ac source is connected to power supply 2 This configuration implies that the primary ac power source originates from port IN port 1 or port 2 The secondary ac power source originates from port ...

Страница 41: ...illuminated to confirm enable status 4 Verify that the green LED NORM also located on the top panel of the receiver is illuminated to confirm that the optical power is within the recommended operating range See Section 5 Operation for other LED functions 5 Select a JXP pad from Table 3 2 or Table 3 3 Insert it to the left of the receiver at the receiver pad facility The test point and pad location...

Страница 42: ...ect a signal level meter to the FORWARD TEST POINT and tune it to a channel near 750 MHz 2 Position the drive selector horizontally 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 4 dB If the output level is greater than required change the pad at the receiver out...

Страница 43: ...wer at all ports is approximately 28 dBmV Digital Return Path To set up digital return path transmitters 1 Confirm the transmitter configuration required For a single transmitter use the optical transmitter A position The redundant transmitter uses the optical transmitter B position Redundancy options are discussed in Section 5 Operation 2 Verify that the green LED ON located on the top panel of t...

Страница 44: ...ables 3 2 or 3 3 This may be required to balance the four outputs for level which can only be done with the output stage pads If the optical levels are high the transmitter s optical modulation index OMI is higher than specified or if the target output is low the output pad may already be a non zero value as indicated in Tables 3 2 or 3 3 To ensure that the target output level is reached on the lo...

Страница 45: ...2 3 7 1 3 7 0 3 6 0 3 5 0 3 4 0 3 3 0 3 2 0 3 2 0 3 0 0 2 0 0 1 0 0 8 Receiver JXPs Common JXP Output JXPs 3 6 6 3 6 5 3 6 4 3 6 3 3 6 2 3 6 1 3 6 0 3 5 0 3 4 0 3 3 0 3 2 0 3 1 0 3 0 0 2 0 0 1 0 0 1 5 0 7 Receiver JXPs Common JXP Output JXPs 3 5 6 3 5 5 3 5 4 3 5 3 3 5 2 3 5 1 3 5 0 3 4 0 3 3 0 3 2 0 3 1 0 3 0 0 2 0 0 1 0 0 0 0 0 2 0 0 6 Receiver JXPs Common JXP Output JXPs 3 4 6 3 4 5 3 4 4 3 4 4...

Страница 46: ... 3 7 0 3 6 0 3 5 0 3 4 0 1 5 0 7 Receiver JXPs Common JXP Output JXPs NR NR NR NR NR NR NR NR 3 9 0 3 8 0 3 7 0 3 6 0 3 5 0 3 4 0 3 3 0 2 0 0 6 Receiver JXPs Common JXP Output JXPs NR NR NR NR NR NR NR 3 9 0 3 8 0 3 7 0 3 6 0 3 5 0 3 4 0 3 3 0 3 2 0 2 5 0 6 Receiver JXPs Common JXP Output JXPs 3 9 6 3 9 5 3 9 4 3 9 3 3 9 2 3 9 1 3 9 0 3 8 0 3 7 0 3 6 0 3 5 0 3 4 0 3 3 0 3 2 0 3 1 0 3 0 0 5 Receive...

Страница 47: ...ds It is assumed that the output of the link is constant so that the same amount of attenuation is removed from the pad facility at the receiver output The four pairs of curves illustrated in Figures 3 8 and 3 9 are for pad values of 0 3 6 and 10 dB An overall tilt of 12 5 dB is assumed for the 750 MHz model and 11 5 dB for the 870 MHz model Figure 3 8 SG2 75 low gain output stage pad effects char...

Страница 48: ...ow the effects of changes in fiber loss and receiver optical power input on c n CTB and composite second order CSO The particular curve along which incident optical power should be equated to c n is determined by the fiber loss budget in the system This must only include fiber loss no connector or splitting losses should be included in this number Because these curves require knowing only the fibe...

Страница 49: ...n performance 77 channels 47 48 49 50 51 52 53 54 55 56 57 6 5 4 3 2 1 0 1 2 Received optical power dBm Lf fiber loss budget C n dB 66 65 5 65 64 5 64 63 5 63 62 5 62 61 5 61 Distortion dBc Lf 2dB Lf 3dB Lf 4dB Lf 5dB Lf 6dB Lf 7dB Lf 8dB Lf 9dB Lf 10dB Lf 11dB Lf 12dB Lf 13dB Lf 14dB CTB CSO ...

Страница 50: ... performance 110 channels 45 46 47 48 49 50 51 52 53 54 55 6 5 4 3 2 1 0 1 2 Received optical power dBm Lf fiber loss budget C n dB 65 64 5 64 63 5 63 62 5 62 61 5 61 60 5 60 Distortion dBc Lf 2dB Lf 3dB Lf 4dB Lf 5dB Lf 6dB Lf 7dB Lf 8dB Lf 9dB Lf 10dB Lf 11dB Lf 12dB Lf 13dB Lf 14dB CTB CSO ...

Страница 51: ...RRB board The DS SG2 DRRB board enables a reliable high speed digital return path while utilizing a minimum number of components It contains two independent RF splitters each providing a single input and dual outputs for RF path A and RF path B in the SG2 lid board The board can be installed as a factory enhancement or field upgrade This optional kit does not have the capability of being controlle...

Страница 52: ...andle Push handle 4 Insert the MCX connector terminating cable J1 into RF INPUT B on DS SG2 DRT 2X A in the transmitter A location 5 Insert the MCX connector terminating cable J2 into RF INPUT B on DS SG2 DRT 2X A in the transmitter B location 6 Remove the existing 0 dB jumpers and install 1 dB JXPs in the four return path JXP locations on the E pack as illustrated in Figure 3 14 ...

Страница 53: ...3 2 0 B e n c h S e t u p SG 2000 Installation and Operation Manual Figure 3 14 Location of JXPs on E pack Replace 0 dB JXP with 1 dB JXP Replace 0 dB JXP with 1 dB JXP ...

Страница 54: ...G2 DRT 2X A 1310 DFB RF INPUT B SG2000 Digital Transmitter DANGER INPUT A INPUT B STAT US DS SG2 DRT 2X A 1310 DFB RF INPUT B SG2000 Digital Transmitter DANGER J1 J2 DS SG2 DRRB board When signals are applied to port in and port 1 they are routed directly to the transmitters through the D type connectors on the lid board When signals are fed from port out and port 3 they are routed to the transmit...

Страница 55: ...omatic test fixtures It cannot be repaired calibrated or aligned in the field If a problem is suspected the LED visible on top of the transponder is useful in troubleshooting During normal operations it indicates the following T The LED illuminates when the module is powered up T A flashing LED indicates two way communication with the LL CU control unit T A dark LED indicates loss of communication...

Страница 56: ...__ _____ _____ _____ Output levels Port 1 Port 2 Port 3 Port 4 Low Frequency Level _____ Level _____ Level _____ Level _____ High Frequency Level _____ Level _____ Level _____ Level _____ ADU frequency _____ Received optical power _____ Vdc SG2 LR output level _____ JXP values Receiver output pad Interstage pad Port 1 pad Port 2 pad Port 3 pad Port 4 pad Gain reserve _____ dB _____ dB _____ dB ___...

Страница 57: ...er pack s in the correct position _____60 V lo _____90 V hi Is the round green LED on the main board illuminated _____ yes _____ no Are the two rectangular green LEDs on each power pack illuminated _____ 24 Vdc _____ 5 Vdc Voltage reading at 24 Vdc test point _____ Vdc Voltage reading at 5 Vdc test point _____ Vdc ...

Страница 58: ... at any time during the node installation Splicing does not need to coincide with the installation of the housing Fusion splicing is recommended because it has low insertion loss and is the most reliable method A technician experienced in splicing fiber should do the splicing To perform fusion splicing 1 Obtain the 50 foot six fiber service cable with the compression fitting from the node package ...

Страница 59: ...tion of the splice enclosure Suspend the extra cable from the messenger using locally accepted methods Commonly used methods include suspending it from the messenger along its entire length and or fashioning a figure eight coil and suspending it from the messenger If you intend to install the housing at a later time protect the end of the service cable with the compression fitting and the fiber co...

Страница 60: ...re 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 Figures 4 2 and 4 3 illustrate the front rear and side views of an installed bracket Figure 4 2 Mounting bracket front view ...

Страница 61: ...ot tighten the hex head bolts at this time This enables the clamps to slide along the strand wire until the housing is finally positioned with respect to the cables 4 Re install all modules and electronic components that were removed before the housing was installed Connections to the housing are made using standard KS type housing port entry connectors Pin type connectors with a nominal center co...

Страница 62: ...or 5 Insert the center conductor fully until it enters the seizure mechanism Tighten the terminal screw onto the cable connector and torque to 12 in lbs 1 ft lb 6 Repeat steps 3 through 5 for all other cable connections required 7 Protect all cable connections with heat shrink tape or tubing 8 Lash the cables to the strand where they approach it and secure the cable lashing wire to the strand with...

Страница 63: ...h of the fiber The diameter of the spool tray is matched to the bend radius of the fiber Also ensure that the fiber is routed under the retaining flanges and through the pegs of the fiber tray for proper routing to the optics modules Figures 4 5 and 4 6 illustrate the housing lid and fiber spool tray Figure 4 5 Housing lid and fiber spool tray Figure 4 6 Fiber spool tray Fiber routed to optics mod...

Страница 64: ...he appropriate receiver or transmitter module 5 Position the fiber service cable in the compression fitting to provide some slack in the fibers inside the housing Tighten the compression nut until it bottoms out Finally tighten the water seal nut until there is no gap between it and the compression nut 6 Close the housing and use a torque wrench to sequentially and progressively tighten the housin...

Страница 65: ...he SG2 lid motherboard LIDB using three different forward path RF options Single Receiver Mode If you are using a single optical receiver module SG2 LR it must be installed in position C An SG2 FJB P jumper board must also be plugged into the LIDB Figure 3 1 illustrates the location of this jumper board The SG2 LIDB distributes an RF signal from the primary receiver C to the RF chassis as illustra...

Страница 66: ...tical receiver B Optical receiver A Broadband Narrowcast Mode For broadband narrowcast operation the broadcast optical receiver must be installed in position C and the narrowcast receiver in position A If redundancy is required for the narrowcast channel install the backup receiver in position B An SG2 FBS split band combiner board must also be plugged into the lid motherboard as illustrated in Fi...

Страница 67: ...ed in Figure 3 1 can be operated in three different positions The positions are B override A override and status monitor MCB B Override The SG2 LIDB overrides the status monitor or manual control board signal and activates receiver B as illustrated in Figure 5 4 Figure 5 4 B override Status monitor signal Receiver enable logic JP2 5V ...

Страница 68: ...ver A as illustrated in Figure 5 5 Figure 5 5 A override Status monitor signal Receiver enable logic JP2 5V Status Monitor Manual Control Operation The SG2 LIDB enables the status monitor or manual control board to activate receiver A or receiver B as illustrated in Figure 5 6 Figure 5 6 Status monitor MCB operation Status monitor signal Receiver enable logic JP2 5V ...

Страница 69: ...nstalling a redundant B transmitter also requires that you change the pad at that location to a JXP 5A Figure 5 7 Redundant return SG2 RPM C SG2 RPLPF Optional transmitter A Optional transmitter B TP TP Bulkhead connector for dc power JXP JXP BASE Status monitor JXP Ingress LID TP TP H L LP filter Alternatively a second transmitter can be used to double the available return bandwidth by having eac...

Страница 70: ... 9 illustrates the inside bottom view of the RF chassis the location of the SG2 RPM C board and the removal sequence Figure 5 9 RF chassis and location of the SG2 RPM C or SG2 RPM S board Cover SG2 RPM C Power connector RF chassis 1 Remove any fuses at F1 F2 F3 F5 or F6 to prevent arcing of the housing connectors 2 Remove the six 5 16 inch hex head screws that secure the RF chassis to the housing ...

Страница 71: ...led in the optical transmitter A position as illustrated in Figure 3 1 A JXP 5A 5 dB pad is installed in the pad facility at the A transmitter location A JXP 15A 15 dB pad must also be installed in the pad facility at the B transmitter location to terminate the signal from the return path module combiner board SG2 RPM C For single return applications the SG2 LIDB distributes an individual RF signa...

Страница 72: ...nd RF input as illustrated in Figure 5 11 Figure 5 11 DS SG2 DRT 2X A split return SG2 RPM S SG2 RPLPF Optional transmitter B TP TP JXP JXP BASE LID Status monitor JXP Ingress TP TP H L LP filter LP filter Using a DS SG2 DRT 2X A transmitter in conjunction with an optional second transmitter B provides return redundancy as illustrated in Figure 5 12 Installing a redundant B transmitter requires yo...

Страница 73: ... module in the appropriate slot and press gently on the casting until it is fully seated Tighten the two mounting bolts to secure the module in the SG 2000 lid 2 Remove the dust covers from the service cable connector and the module s optical connector 3 Carefully clean the optical connector using a suitable optical cleaning kit 4 Connect the service cable to the module s optical connector 5 If ne...

Страница 74: ...suitable optical connector cleaning kit If an optical connector cleaning kit is not available clean the connector using pure isopropyl alcohol 99 and a lint free wipe Dry it with filtered compressed air You can also clean the bulkhead adapter using filtered compressed air 5 Re assemble the bulkhead adapter to the internal optical connector Ensure that you install the internal optical connector in ...

Страница 75: ...ication 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 NORM when the optical power is within the recommended operating range refer to Table A 4 Two red LEDs indicate that the optical power is above HIGH or below LOW the recommended optical ...

Страница 76: ...ately 2 dB greater than the minimum levels Optical modulation index OMI for 77 channels per channel 0 0403 OMI for 110 channels per channel 0 0337 Optical transmitter wavelength is 1310 nm Bold type indicates default values Figure 5 14 illustrates the relationship between test point voltage Vdc and optical power dBm Figure 5 14 Test point voltage versus optical power Optical power dBm 6 5 4 3 2 1 ...

Страница 77: ...tical connector assembly so that you can replace it in the same position when you re assemble the module 3 Carefully lift the fiber coiling tray until the wavelength selection jumper is visible To avoid damaging the fiber do not lift the tray any more than is necessary to expose the wavelength selection jumper 4 Position the jumper block on the appropriate pins for the desired wavelength Figure 5 ...

Страница 78: ...ath optical receiver Figure 5 16 illustrates the SG2 IFPT Figure 5 16 SG2 IFPT F A U L T O N LASER CURRENT 1 V A OPTICAL POWER 1 V mW SG2000 Optical Transmitter ASSEMBLED IN MEXICO SG2 IFPT Table 5 3 provides information on the user related features of the SG2 IFPT Table 5 3 SG2 IFPT features Feature Description Optical power test point This test point enables monitoring of the optical output leve...

Страница 79: ...ceiver Figure 5 17 illustrates the SG2 FPT Figure 5 17 SG2 FPT F A U L T O N LASER CURRENT 1 V A OPTICAL POWER 1 V mW SG2000 Optical Transmitter ASSEMBLED IN MEXICO SG2 FPT Table 5 4 provides information on the user related features of the SG2 FPT Table 5 4 SG2 FPT features Feature Description Optical power test point This test point enables monitoring of the optical output level of the module The...

Страница 80: ...Figure 5 18 illustrates the SG2 DFBT Figure 5 18 SG2 DFBT F A U L T O N LASER CURRENT 1 V A OPTICAL POWER 1 V mW SG2000 Optical Transmitter ASSEMBLED IN MEXICO SG2 DFBT Table 5 5 provides information on the user related features of the SG2 DFBT Table 5 5 SG2 DFBT features Feature Description Optical power test point This test point enables monitoring of the optical output level of the module The n...

Страница 81: ... that lights if the hybrid current is outside the normal operating range the laser output power is below normal limits or the laser current is above normal limits Because the laser output requires a short period of time to stabilize it is acceptable for the fault indicator to illuminate during the stabilization interval approximately 2 seconds Note that the module must be enabled for the fault ind...

Страница 82: ...he module is enabled under normal operating conditions Note that the optical power test point does not track changes in optical power due to the laser tracking error Laser current test point This test point enables monitoring of the current drawn by the laser diode The nominal scale factor is 1 0 V A The laser current test point voltage is between 5 mV through 110 mV laser current of 5 mA through ...

Страница 83: ...W when the module is enabled under normal operating conditions Note that the optical power test point does not track changes in optical power due to the laser tracking error Laser current test point This test point enables monitoring of the current drawn by the laser diode The nominal scale factor is 1 0 V A The laser current test point voltage is between 4 mV through 90 mV laser current of 4 mA t...

Страница 84: ... 13 dB from an input level of 15 dBmV All transmitter status monitor information is available at the digital return receiver To facilitate easy upgrades the DS SG2 DRT A fits the same footprint and has the same set up levels as the analog return transmitters Figure 5 21 illustrates a block diagram of the DS SG2 DRT A Figure 5 21 DS SG2 DRT A Serializer Transmit signal processing logic A D converte...

Страница 85: ... short red blink occurs if the decrement attempts to go past the minimum Medium press 1 5 to 5 0 seconds The status LED is OFF after 1 5 seconds when in the increment direction and yellow when in the decrement direction The LED is restored to its green or alarm state when the button is released No increment or decrement occurs Long press 5 0 seconds or longer The status LED flashes green and yello...

Страница 86: ...B from an input level of 15 dBmV All transmitter status monitor information is available at the digital return receiver To facilitate easy upgrades the DS SG2 DRT 2X A fits the same footprint and has the same set up levels as the analog return transmitters Figure 5 23 illustrates a block diagram of the DS SG2 DRT 2X A Figure 5 23 DS SG2 DRT 2X A Serializer Transmit signal processing logic A D conv...

Страница 87: ...the minimum Medium press 1 5 to 5 0 seconds The status LED is OFF after 1 5 seconds when in the increment direction and yellow when in the decrement direction The LED is restored to its green or alarm state when the button is released No increment or decrement occurs Long press 5 0 seconds or longer The status LED flashes green and yellow rapidly until the button is released After five seconds of ...

Страница 88: ...2X A cable connector Figure 5 25 DS SG2 DRT 2X A cable connector Figure 5 26 illustrates the DS SG2 DRT 2X A installed in the SG 2000 with completed fiber connections Figure 5 26 DS SG2 DRT 2X A installed in SG 2000 INPUT A INPUT B STATUS DS SG2 DRT 2X A 1310DFB RF INPUT B SG2000 Digital Transmitter DANGER ...

Страница 89: ...vice cable SG2 PS Power Supply The DS SG2 DRT 2X A requires the SG2 PS power supply rather than the SG2 PS2 power supply The SG2 PS provides the power required to support dual DS SG2 DRT 2X A transmitters in a redundant configuration Figure 5 28 illustrates the SG2 PS power supply Figure 5 28 SG2 PS power supply SG2 PS ASSEMBLED IN MEXICO LO HI 24V 5V ADJ TEST POINT TEST POINT CAUTION NO USER SERV...

Страница 90: ...tus monitor signals are returned to the digital return receiver as part of the data stream Receiver optical power Measures the optical power received by the A B or C optical receiver Transmitter optical power Measures the optical power emitted by the A or B optical transmitter This is not implemented in the digital return transmitter The status monitor signals are returned to the digital return re...

Страница 91: ... the selection is performed manually using switch S1 3 The factory setting is NORM Switch S1 3 Selects either receiver A RXA or receiver B RXB as the primary optical receiver when S1 2 is in the NORM position With S1 2 in the OVER position S1 3 manually enables either receiver The factory setting is RXA Switch S2 1 Selects standard slaving or cross slaving of the transmitters to the receivers Set ...

Страница 92: ...ingress control switches ICS when they are installed in the return paths of the RF output ports The factory setting is for minimum attenuation however they can be set for a maximum attenuation of approximately 40 dB The following list indicates the potentiometer and its corresponding housing port ICS1 housing port IN RF chassis port 1 ICS2 housing port OUT RF chassis port 2 ICS3 housing port 1 RF ...

Страница 93: ...ontrolled in one of two ways 1 remotely through the optional on board LL SG2 transponder in communication with the status monitoring system or 2 locally using the manual control board MCB The three states of the switch and their functions include State Description Off Effectively isolates the contaminated leg by adding a minimum of 40 dB attenuation 6 dB Typically initiated at the headend it provi...

Страница 94: ...mV 4 dBm 47 dBmV 2 dBm continuous Optical input return loss 40 dB minimum Equivalent input noise current 8 pa Hz 1 2 Table A 2 lists the station RF characteristics for the SG 2000 node Table A 2 Station RF characteristics Parameter Specification Forward passband frequency 47 MHz through 870 MHz dependent upon split Return passband each port 5 MHz through 65 MHz dependent upon split 200 MHz capable...

Страница 95: ...ing 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 without bracket Table A 4 lists the general specifications for the SG2 LR optical receiver Table A 4 SG2 LR specifications Parameter Specification Optical input power range recommended 4 0 dBm to 2 0 dBm Optical input power maximum recommended 1 3 dBm Op...

Страница 96: ...loss 18 dB minimum Recommended total input power 15 dBmV Carrier to noise ratio 9 dB link 35 MHz BW 40 dB minimum 25 5 C and 36 5 dB minimum from 40 C to 60 C Table A 6 lists the RF performance specifications for the SG2 FPT laser transmitter Table A 6 SG2 FPT RF specifications Parameter Specification Nominal RF input impedance 75 ohms RF passband 5 MHz through 65 MHz Flatness peak to valley 1 00 ...

Страница 97: ...imum RF input return loss 18 dB minimum Recommended total input power 15 dBmV Carrier to noise ratio 9 dB link 35 MHz BW 41 dB minimum Table A 8 lists the RF performance specifications for the SG2 DFBT 3 laser transmitter Table A 8 SG2 DFBT 3 RF specifications Parameter Specification Nominal RF input impedance 75 ohms RF passband 5 MHz through 200 MHz Flatness peak to valley 1 00 dB maximum RF inp...

Страница 98: ...input power 15 dBmV Optical output power 1 mW 1 dBm nominal Carrier to noise ratio 9 dB link 35 MHz BW 36 5 Table A 10 lists the RF performance specifications for the SG2 DRT A digital return transmitter Table A 10 SG2 DRT A RF specifications Parameter Specification Nominal RF input impedance 75 ohms RF passband 5 MHz through 42 MHz Flatness peak to valley 0 5 dB maximum RF input return loss 18 dB...

Страница 99: ...the electrical output of the receiver Table A 12 lists the minimum optical output power ratings for each available wavelength and transmitter model These values are applicable for the DS SG2 DRT A and DS SG2 DRT 2X A Table A 12 Optical output power vs wavelength for DS SG2 DRT A transmitters Minimum Optical Output Power dBm Model 7 001 DS SG2 DRT A 1310 FP SC 2 002 DS SG2 DRT A 1310 DFB SC 3 008 D...

Страница 100: ...dd for Additional receiver split band 8 96 0 13 0 20 0 23 0 27 Additional receiver redundant 0 64 0 01 0 01 0 02 0 02 Analog return transmitters 9 84 0 15 0 22 0 25 0 30 Digital return transmitters DS SG2 DRT A DS SG2 DRT 2X A 4 17 8 33 0 08 0 17 0 12 0 23 0 12 0 25 0 14 0 27 Reduction for split return 3 52 0 05 0 08 0 09 0 11 Each ingress switch 1 96 0 03 0 04 0 05 0 06 ADU 2 24 0 03 0 05 0 06 0 ...

Страница 101: ...nd c n performance for the SG2 87 with a load of 94 channels Table A 15 SG2 87 performance with 94 channels 94 Channels Link Launch System C N 51 4 65 66 51 2 CTB 67 62 58 CSO 62 62 58 Link SG2 LR w ALM9 94 ch 20km Loss budget 9 0 dB Output level 650 MHz 45 5 dBmV ch Output level 50 MHz 37 0 dBmV ch Table A 16 lists distortion and c n performance for the SG2 87 with a load of 110 channels Table A ...

Страница 102: ...2 inch 25 40 2 1 3 3 2 8 4 5 Seizure screw 8 32 3 16 inch 11 12 0 9 1 0 1 2 1 4 Hybrid 6 32 Phillips 15 17 1 2 1 4 1 7 1 9 Chassis E pack 10 32 5 16 inch 18 22 1 5 1 8 2 0 2 4 Chassis cover 6 32 inch 15 17 1 2 1 4 1 7 1 9 Return path modules 6 32 inch 15 17 1 2 1 4 1 7 1 9 Return path module cover 6 32 inch 15 17 1 2 1 4 1 7 1 9 Power interconnect cable 4 40 slotted 4 6 0 3 0 5 0 5 0 7 Optical mod...

Страница 103: ... n carrier to noise ratio CSO composite second order CTB composite triple beat CU control unit dB decibel dBc decibels relative to the carrier dBm decibels relative to 1 milliwatt dBmV decibels relative to 1 millivolt dc direct current DFB distributed feedback DIP dual in line package FC ferrule connector FM frequency modulation FTEC fast trigger electronic crowbar GBPS Gigabytes per second IC int...

Страница 104: ...ational Television Standards Committee OMI optical modulation index P V Peak to valley pA picoampere RF radio frequency RIN relative intensity noise RSA return for service authorization SC snap connector TCU thermal control unit V volt VCXO Voltage controlled crystal oscillator XO Crystal oscillator ...

Страница 105: ...481740 001 12 01 MGBI ...

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