Cisco Systems AS5800 Dial Shelf DC-Input Power Supply, Connector Pin Definitions Description

Dial Shelf DC-Input Power Supply

•System environmental monitoring

A 10-pin connector monitors system environmental status and communicates this status from each PEM to the filter module maintenance bus (MBus). Table 1-6lists connector pins supporting system status signals.

Table 1-6		Connector Pin Definitions
Pin	Description		Pin	Description
1	–48V monitor		6	Not used
2	Not used		7	Not used
3	Breaker connect		8	–48V return monitor
4	Current monitor		9	Not used
5	Voltage monitor		10	15V_BIAS

•Voltage level and current monitoring

The DC-input power supply is designed to prevent any energy hazard during operation. DC power is first routed to a circuit breaker, followed by a surge protector. In addition, an isolation diode circuit protects against possible DC-input failure.

The DC-input power supply monitors analog output voltage and current. The battery side of the DC input is equipped with a 60 A circuit breaker, which trips if current reaches peak parameters for 2 sec. The DC-input power supply circuits are described in Table 1-7.

If a PEM is not properly seated in the Cisco 5814 dial shelf backplane, an electronic circuit, or interlock, trips a breaker in the PEM and terminates power to the output connectors. This same interlock provides reverse polarity protection when the system is powered off.

Table 1-7	DC-input Power Supply Circuits
Circuit	Description
Circuit breaker	PEM output is enabled when this pin is shorted to the -48Vmonitor pin by
	way of the backplane. If the connection is broken, the breaker is tripped
	and cannot be reset until the PEM is reinstalled.
Reverse polarity	An electronic interlock that provides reverse polarity protection.
Current monitor	Analog output voltage is proportional to DC-output current from the PEM
	to the backplane, as follows: 1 A of current is equivalent to 100 mV at the
	current monitor pin.
Voltage monitor	Analog output voltage is proportional to DC-output current from the PEM
	to the backplane, as follows: 1 A of current is equivalent to 100 mV at the
	voltage monitor pin.
Bell alarm	A terminal block for connecting to central office alarms (C, NC, NO)

Note Connect the alarm port only to a safety extra-low voltage (SELV) source using 22 AWG, or thicker, copper wire. SELV ratings are maximum 30 Volts AC (RMS), maximum 60 Volts DC, and maximum 50 VA Power. The alarm port is rated for 2.0 Amp maximum current.

Cisco AS5800 Product Overview 1-25