Introduction; Fig. 1-1, Spi-20; Fig. 1-4, Spi-Rf; Fig. 1-2, Spi-20 And Spi-25 Rear - EnerSys alpha SPI-20 Manual De Instalación

1.0 Introduction

The Service Power Inserter (SPI) is used as an interface between the power supply and coaxial plant. When used in
conjunction with service power supplies such as the APP9005C, APP9015S and APP9022S, the SPI's integrated bypass
switch helps limit plant power outages when a power supply is being serviced or replaced. During normal operation
the bypass switch is set to ON and power is routed from the power supply through the SPI to the coaxial plant. When
servicing or replacing a power supply, a service power supply is connected to the SPI and the bypass switch is set to ALT.,
allowing the service power supply to power the plant through the SPI.
SPI-20: The SPI-20 is a 20A unit that includes a black/white connector to the power supply, a bypass switch and a Jones
connector for connection to a service power supply. This unit also features a coaxial termination port which can be
secured in place via the seizure screw access port.
SPI-25: The SPI-25 is a 25A unit that includes a black/white connector to the power supply, a bypass switch and a red/
white connector for connection to a service power supply. This unit also features a coaxial termination port which can be
secured in place via the seizure screw access port.
Seizure Screw Access
Bypass Switch
Jones Connector to
Service Power Supply
Black / White Connector to
Power Supply

Fig. 1-1, SPI-20

SPI-RF: The SPI-RF is a 20A unit that includes a black/white connector to the power supply, a bypass switch, Jones
connector for connection to a service power supply and an integrated RF port. The RF port allows for easy network
connection of the power supply's DOCSIS
enclosure from a tap. RF levels can be adjusted by changing the onboard RF attenuator. An LED indicates the presence
of primary power, and a test point provides fast measurement of AC voltage. The SPI-RF can be removed or replaced
without removal of the main cable entry assembly.
Bypass Switch
Jones Connector to
Service Power Supply
Power Source Indicators
AC Output Test Point
RF In / Out
6
Coaxial Termination

Fig. 1-2, SPI-20 and SPI-25 Rear

transponder eliminating the need for a coaxial drop being run into the
®
M AI N
M A IN
A U X
A U X
A U X
S P I- R F
TO R
PR OT EC
SU RG E
D
EQ UIP PE
AC OU PU T
TE ST PO IN T
R F
IN /
O U T
B LA C K
W H IT E
M A IN
G N D

Fig. 1-4, SPI-RF

Nut
Black / White
Connector to
Power Supply
Seizure
Screw
Access
W
S C R E
S S
A C C E
L E V E L
P A D
Onboard
Attenuation
Black / White
Connector to
Power Supply
Seizure Screw Access
Bypass Switch
Red / White
Connector to Service
Power Supply

Fig. 1-3, SPI-25

Nut
Coaxial
Termination
Rear
745-997-C0-001 Rev. B (02/2021)