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5� Site Evaluation and Pre-Installation
5�1 Pre-Installation Requirements
5�1�1 Effective Capacitance
The effective capacitance of each output of the LPS36 is 2.7 microfarads maximum between the output connections
to the telecommunications network and 0.5 microfarads between each output connection to the telecommunica-
tions network and earth ground.
•
At the time of installation, carry out a system assessment to ensure that the effective capacitance of the total sys-
tem, including the capacitance of the LPS36 system, does not exceed 11 µF (line to earth) and 40µF (line to line).
5�1�2 RFT-V Circuits
•
At the time of installation, ensure that the voltage rating of the wiring of the telecommunication network is ad-
equate for the normal RFT circuit voltage (+/-200Vdc), together with superimposed transients.
•
Ensure that the circuits to be connected together are all RFT-V circuits.
5�1�3 Primary Protection
The LPS36 has built-in second level surge protection in compliance with the GR-1089 requirement. Primary protec-
tion must be in place at the customer site. External primary surge protection devices are necessary to optimally
protect the RFT-V circuits from lightning surge and maintain safety certification to UL/CSA 60950-21.
Each channel (pair) must be properly protected by the upstream system using a 5-pin protector to a level corre-
sponding to a Bourns 2410 Series. For example: 2410-33-G-MSP-S provides the part in a red color. This protector
should be UL 497 listed and rated for 300-400 Volts voltage breakdown range.
5�1�4 Transient Response
The LPS36 has been designed to provide protection against typical input and output voltage surges. For exam-
ple, in the event of any single isolated 75 Vdc/9.5ms overvoltage transient being applied between the input power
terminals, the LPS36 will continue to operate properly, and will not be damaged or degraded in performance.
However, the RFT-V output may exhibit a momentary voltage over/under-shoot by as much as 25% of the nominal
output voltage, depending on the characteristics of the equipment being connected as a load. The down-con-
verter connected at the remote end is expected to tolerate this dynamic line voltage swing.
In the event of lightning surges and AC power faults, the RFT-V output ports of the LPS36 will experience voltage
surges of up to a few thousand volts, but the equipment will not be damaged, and will continue to operate without
manual intervention after normally expected electrical stresses and transients (i.e. first-level surges), and will
remain safe under less frequently encountered severe stresses and transients (i.e. second-level surges).
For critical application that requires a more robust system such that any momentary interruption on the remote
end is not acceptable (as caused by input or output transients described above), Alpha recommends using the
AlphaCap 665 Short Duration Backup Supply Module (p/n 013-015-20) in conjunction with Alpha CSM46.
For more information on this subject, please refer to Telcordia Technologies Generic Requirements document for
Electromagnetic Compatibility (EMC) and Electrical Safety – Generic Criteria for Network Telecommunications
Equipment (GR-1089-CORE).
5�2 Packing Materials
Alpha is committed to providing products and services that meet our customers’ needs and expectations in a
sustainable manner, while complying with all relevant regulatory requirements. As such Alpha strives to follow
our quality and environmental objectives from product supply and development through to the packaging for our
products.
Packaging assemblies and methods are tested to International Safe Transit Association standards.
