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Modules 4-7
SG4000 Installation and Operation Manual
SG4-* Analog Optical Return Path Transmitters
The analog SG4000 analog optical return transmitters are single wide modules that feature
either Fabry-Perot or Distributed Feedback lasers, depending on the level of performance
required. The physical form factor of each transmitter is identical and shown in Figure 4-4.
These transmitters have an integrated RF amplifier and all the active circuitry required to
provide RF drive to the laser, enabling optimized performance while minimizing set-up time. All
transmitters incorporate a microprocessor-controlled circuit to minimize any variation in the
optical modulation index (OMI) as the laser slope efficiency changes due to ambient
temperature variations. An optical output power DC voltage test point and RF input test point
are accessible through the top panel of the transmitter. RF drive level adjustments are
accomplished with a JXP style attenuator pad.
Figure 4-4 illustrates a functional block diagram of a typical SG4-* transmitter.
Figure 4-4
SG4-* transmitter block diagram
JXP-6 JXP-*
Pin
atten.
Pin
driver
APC
circuit
Laser
matching
Laser
Micro-
processor
Temp
sensor
Test Point
Return level
set up pad
(factory set to 6 dB)
Hybrid
OMI pad
Optical
output
Optical power
sense signal
(1.0 V/mW)
Optical power
Test Point
(1.0 V/mW)
RF input
22 dBmV
nominal
Figure 4-5 illustrates an SG4-* transmitter with the cover installed (left) and cover
removed (right).
Figure 4-5
SG4-* transmitter
OPTICAL TRANSMITTER
ON
FAULTFAULT
1V/mW
-5dBmV NOMINAL
TOTAL POWER
OPTICAL
OUTPUT
IFPT
EIFPT
DFBT
DFBT3
Optical power
test point
JXP attenuator
RF test point
JXP (factory set
to align OMI)
ON
FAULT
LEDs
- Installation and 1
- Operation Manual 1
- FDA Compliance 3
- Contents 4
- Modules 5
- Installation 6
- Figures 6
- Contents v 8
- Introduction 10
- Figure 1-2 11
- SG4000 – open 11
- Using this Manual 12
- Related Documentation 12
- Document Conventions 13
- If You Need Help 13
- Calling for Repairs 14
- Overview 15
- Housing 16
- Figure 2-3 17
- Housing port locations 17
- Gaskets 18
- Weather gasket 18
- (silicone rubber) 18
- RF gasket 18
- (woven wire) 18
- Network Monitoring 19
- Options and Accessories 19
- Electronics Package 20
- Figure 2-5 21
- Figure 2-6 22
- Configuration 23
- Bandpass Frequency 24
- Station Slope 24
- Bandpass Frequency Splits 25
- Level Control 26
- Port Entry 27
- Figure 2-10 28
- Bench Setup and Operation 29
- Figure 3-2 30
- Forward Path Configuration 31
- Forward Split 33
- Loss = 8.7 dB 34
- Forward Redundant Split 36
- PRI) and secondary (SEC) 38
- SW1 AUTO position 39
- Forward Segmented 2X 40
- Figure 3-14 43
- SEC RX PRI RX 44
- SW2 AUTO position 46
- Forward Segmented 4X 47
- Loss = 2.7 dB 48
- Return Path Configuration 50
- Combined Return 52
- Loss = 0.9 dB 53
- Combined Redundant Return 55
- Split Return 58
- Split Redundant Return 61
- Segmented Return 64
- Power Distribution Board 67
- Figure 3-37 68
- Power distribution board 68
- Figure 3-38 69
- SG4000 – fuse locations 69
- of the housing base. 20 A 70
- Power Supply Operation 71
- Ensure shunt F1 (30 A): 72
- 4-2 Modules 74
- SG4-R/* Optical Receiver 75
- 4-4 Modules 76
- 4-6 Modules 78
- Figure 4-4 79
- Figure 4-5 79
- SG4-* transmitter 79
- SG4-IFPT Optical Transmitter 80
- SG4-DFBT Optical Transmitter 81
- SG4000 RF Module 82
- Modules 4-11 83
- FSB Board 84
- SG4-PS Power Supply 85
- Adding Power Supply Modules 86
- Embedded Plug-in Module 87
- 4-16 Modules 88
- RF port 1 88
- RF port 6 88
- Ingress Control 89
- Status Monitoring 89
- Parameter 90
- Fiber Cables 92
- Figure 5-3 93
- Fiber management tray 93
- Figure 5-2 93
- 5-4 Installation 94
- Clamps Clamp 95
- 5-6 Installation 96
- Pedestal Mounting 97
- Grounding the SG4000 98
- Coaxial Cable Installation 99
- Closing the Housing 100
- Specifications 101
- A-2 Specifications 102
- Specifications A-3 103
- A-4 Specifications 104
- Torque Specifications 105
- Abbreviations and Acronyms 106
- Abbreviations and Acronyms-2 107
- 529086-001 108
- Visit our website at: 108
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