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AT&T SLW2500 Installation and Operation Manual
Power Supply
The SLW2500 power supply (SG2-PS) is located in the housing lid to optimize heat transfer and
to balance the thermal load between the base and the lid. An umbilical cord connects the
SG2-PS to the base.
You can power the node from either 60 Vac (
LO) or 90 Vac (HI) system power supplies. The unit
is shipped from the factory set for 60 Vac powering. For systems equipped with 90 Vac
powering, the suitcase jumper on the dc power supply can be repositioned to optimize the supply
start-up voltage for the higher input range. A description of this procedure is in Section 3,
“Bench Setup”.
A flexible power-distribution design enables you to power the node from any of the four main RF
ports, as well as, a single dedicated power input port. Using fuses and shunts, you can configure
the node to distribute power to the remaining active ports. It can also be powered from the
power input port while a second power source is passed through on any combination of the main
RF ports.
The power supply circuit includes a heavy-duty, gas-discharge, tube surge protector located on
the amplifier module. You can replace this surge protector with the optional FTEC surge
protector. The FTEC triggers at approximately 230 V and presents a short circuit to the line
during periods of overvoltage. After the ac input voltage returns to normal, the FTEC returns to
its open circuit state. This provides the node with a level of protection against surge currents on
the ac line.
Twenty-ampere fuses are installed at the factory to provide power passing to additional
amplifiers. The fusing options are detailed in Section 3, “Bench Setup”.
Figure 2-4 illustrates the SG2-PS power supply:
Figure 2-4
SG2-PS power supply
SG2-PS
CAUTION
NO USER SERVICEABLE PARTS INSIDE
ASSEMBLED IN MEXICO
SEE INSTALLATION MANUAL FOR SERVICE
VOLTAGES I N EXCESS OF
300 VOLTS AR E PRESENT
UNDER COVER AND MAY
BE PR ESENT AFTER POWER
IS REMOVED
LO HI
24V 5V
ADJ
TEST
POINT
TEST
POINT
- STARLINE 1
- Contents 3
- Contents iii 5
- Introduction 6
- Figure 1-2 7
- SLW2500 node — open 7
- Using This Manual 8
- Related Documentation 8
- Document Conventions 8
- If You Need Help 8
- Calling for Repairs 9
- Overview 10
- Housing 11
- Port Locations 12
- Gaskets 13
- Power Supply 14
- Forward Path 15
- SG2-LR Receiver 17
- Return Path 18
- Level Control 19
- Options and Accessories 19
- Gain Selection 20
- Tilt Selection 21
- Bench Setup 22
- Figure 3-2 23
- SLW2500 RF chassis 23
- Powering the Node 24
- SLW 2500 25
- Power Supply Settings 26
- Forward Path Padding 28
- Installation 30
- Strand Wire Mounting 32
- Coaxial Cables 34
- Fiber Cables 35
- Operation 37
- SG2-DFBT Optical Transmitter 39
- Feature Description 40
- Configuration 41
- Wavelength Selection Jumper 42
- Return Path RF 43
- Specifications 45
- Parameter Specifications 46
- Parameter Specification 46
- Torque Specifications 50
- Abbreviations and Acronyms 51
- 473205-001-99 53
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