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13.2 Powering on the E4140 Shelves
This procedure describes how to power on the E4140 shelves and the boards in these
shelves.
l
Power is supplied to the E4140 shelves in the same cabinet from bottom to top.
l
The power supplied to each E4140 shelf is controlled by four power switches. During
the power-on, the switches in Area A of the unified
turned on before the switches in Area B are turned on.
For the power cable connections of the E4140 shelves, see
Prerequisite
l
You know the electrical control relationships between the unified
assembly.
l
A multimeter is ready.
Steps
1. Perform the following procedures before powering on an E4140 shelf.
a. Verify that Dual In-line Package (DIP) switches of the shelf have been set in the
correct positions.
b. Verify that the switch of the New Power Entry Module (NPEM) in the shelf is set
to "OFF".
c. Verify that all boards are correctly installed into the shelf and the extractors on the
front boards are opened.
d. Ensure that the fan modules are present.
During equipment operation, if you want to maintain the fan module, you
must complete the maintenance quickly to prevent hardware damage due to
overheating.
2. Power on the shelf.
a. Set the shelf switch in Area A of the unified
b. Use the multimeter to check the PDU's output voltages.
The tolerance of the –48 V voltage is from –40 V to –57 V, the tolerance of the –60
V voltage is from –50 V to –72 V.
c. Verify that the –48 V A and –48 V B indicators on the
the OK indicator is flashing green.
SJ-20141121113158-006|2014-12-20 (R1.0)
Caution!
PDU
PDU
13-3
ZTE Proprietary and Confidential
Chapter 13 System Power-On
(see
Figure
6-2) should be
Figure
8-1.
PDU
to "ON".
NPEM
are flashing red and
and each
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