Verilink 2048 (34-00179) Product Manual - Manual (Page 18)

Installation 2 -11 2048 PMU/NTU
Connect a ground lead (18- to 20 -gauge) to the terminal
marked ‘Frame Ground’ on TB2, pin 2. Connect the other
end of this lead to an appropriate facility ground.
The following three modes of powering the chassis are
available:
Redundant Power Source: The chassis is shipped with a
redundant power board installed on power connector TB2.
This board allows the connection of two independent -48
VDC supplies operated in a redundant mode. All slots in the
chassis are powered from the combined input of the A and B
power supplies. If either supply fails, the other will power
the entire chassis.
To operate in the redundant power mode, connect the A bus
“-48 V IN (A)” and “+48 V RTN (A)” terminals on the
redundant power board to the corresponding terminals of
power supply A. Connect the B bus “-48 V IN (B)” and
“+48 V RTN (B)” terminals to the corresponding terminals
of power supply B.
Single Power Source: When using a single power source,
simply connect the A bus “-48 V IN (A)” and “+48 V RTN
(A)” terminals on the redundant power board to the corre-
sponding terminals of power supply A. This is essentially
the same as the redundant configuration with power supply
B not operational.
If not using the redundant power board, the A bus and the B
bus must be connected together on the rear of the chassis
with a jumper (pin 3 to pin 4 and pin 1 to pin 6).
Dual Power Source: When using a dual independent power
supply, one -48 VDC source feeds the A bus while another -
48 VDC source feeds the B bus. First, remove the redundant
power board. Connect the A bus “48 V Return” and “-48
VDC” terminals to the corresponding terminals of power
supply A (to power the odd numbered slots). Connect the B
bus “48 V Return” and “-48 VDC” terminals to the corre-
sponding terminals of power supply B (to power the even
numbered slots).
NOTE: Each PMU requires a 75 mA current. Ensure
that the proper fuse size is used. Refer to the 1040
Power Shelf configuration guide.