User Manual

ADCP-75-192 • Issue 1 • December 2005 • Section 2: Description
Page 2-32
 2005, ADC Telecommunications, Inc.
Table 2-21. APEC User Interface
REF
No.
USER INTERFACE
DESIGNATION
DEVICE FUNCTIONAL DESCRIPTION
1 AC Power Input
Connector
3-wire AC power
cord connector
Provides AC power into the cPCI chassis
2 Fan Power Connector 20 pin enclosed
header connector
Provides power to chassis and enclosure
fans. Monitors fan speeds
3 Fan fault LEDS LED (red) CH – cPCI chassis fans not turning
L – Left two enclosure fans not turning
C – Center two enclosure fans not turning
R – Right two enclosure fans not turning
4 I2C Connectors RJ45 connector Reserved for future use
7.4 DC Power Entry Controller (DPEC)
The DC Power Entry Controller (DPEC) is used for any installation requiring battery backup.
It provides the following functions:
• DC Power for cPCI power supplies
• Fan tachometer monitoring and control
• FAN fault indicator LED’s
• Future growth for I2C and GPS connections to backplane (not currently used)
• Battery controller
i. Charge controller
ii. Low Voltage Disconnect
iii. Temperature monitor
iv. Fault detection
The DPEC powers the six-slot chassis from the +28VDC power supplies located in the RF
Assemblies. The DPEC provides swap-over circuitry which monitors the +28VDC input and
switches to battery if this input power disappears. It also charges the battery as necessary when
normal operating power is present. The DPEC front panel is shown in Figure 2-31 and the user
interface is described in Table 2-22.