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MCPS4080 System Monitoring

MCPS4080 System Operation 23

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5.4 MCPS4080 Alarm Limits and Protection Circuits

The MCPS4080 series of multi-carrier power amplifiers has a wide range of alarm

configurations available. These may be specified to meet the demands of specific

applications. In addition, the MCPA modules have built-in protection circuits to

prevent damage from unintentional misuse. Module alarms may be summarized

and reported to a BTS using a customized interface. This hierarchical system

insures that Spectrian’s MCPS4080 series amplifier systems remain robust with a

minimum of false alarms, but promptly report any real issues to the base station

controller.

The default alarm limit settings and analog protection circuit operation for the

MCPS4080 family of MCPA amplifier systems is summarized below. The

information contained herein is provided

for reference only.

Guaranteed

specification limits must be negotiated between prospective customers and

Spectrian. There are three levels of the alarm/protection hierarchy:

•

Analog Protection Circuits – Configured in hardware design to protect the

MCPA.

•

MCPA Module Alarms – Most are software configurable for specific

applications.

•

Amplifier System Alarms – Summarizes MCPA and Alarm Management

Module status.

In general, analog protection circuit limits are set by design, and may not be

changed. MCPA alarm limits are software configurable, and may be tailored to

meet customer alarm specifications. Individual MCPA alarms is not displayed on

the module front panel, but they are accessible through Spectrian’s Graphical User

Interface (GUI) software. System level alarms are summaries of the module alarm

status (minor/major/critical), as well as the Amplifier Management Module

(AMM) and the communication link between the modules and the AMM. The

summary set-up is configurable using the amplifier GUI software.

5.4.1 MCPA Module Analog Protection Circuits

The MCPS4080 MCPA module design incorporates circuits to prevent MCPA

module damage by common misuse conditions. The circuits react automatically to

the conditions shown in Table 3 with the limits set as noted. These limits are not

adjustable by software configuration.

Control Condition Latch

Input Overdrive > -2 dBm @ Input (configured for 55dB module gain) No

Error Amp Overdrive > -15 dBm @ Carrier Cancellation Input No

Over voltage Clamp Internal DC line is limited to 28V by linear regulation

up to 30V input

Circuit Breaker > 60 A current draw Yes

Table 3: Analog Protection Circuit