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PES1900Gi NR Operations Manual
Chapter 11. Maintenance and Troubleshooting— 171
Backing Up the Internal Battery
The PES1900Gi NR includes an internal battery backup to provide limited back-up power for the
ACU, and, if applicable, the cell phone and internal modem. In the event of a loss of system power,
the internal battery provides power for the repeater to call out and report the failure, and to save the
Alarm and Event Log. The length of time the internal battery provides power depends upon repeater
configuration and environmental conditions (such as temperature).
System mains power charges the internal battery during normal operation. Note that the internal
battery has a low-voltage cut-off to allow for a full recharge when power is restored.
If a power outage lasts longer than the operational limit of the internal battery, the modem cannot
send or receive calls, and Alarm and Event Log data is lost. Save the Alarm and Event Log when the
repeater calls out to report a system power failure. However, repeater configuration information—
gain, frequency, alarm severity, and other settings—is preserved beyond the life of the internal
battery.
NOTES:
The internal battery does not provide power for RF transmission during a power outage.
Service is interrupted during a loss of system power.
The internal battery has a useful life of approximately 2 to 3 years, depending upon the
temperature range experienced and the number of charge and discharge cycles. For
preventative maintenance, Peninsula Engineering Solutions suggests that the battery be
replaced every 3 years. See Spares list for replacement part numbers.
Keeping Spares
Because repeaters are often used to provide critical coverage, customers are advised to follow a
sparing policy. While most telecommunications carriers or system operators have internal policies
relative to equipment sparing, in the event that one does not exist, Peninsula Engineering Solutions
recommends maintaining a minimum of one (1) spare unit for every increment of 10 units or fraction
thereof. This assumes that all spares are immediately available to the technician in need for
installation. Each organization should develop a company-specific, equipment-specific policy that
meets their needs, taking into account geographic considerations and the quantity of repeaters used
in the network.