Verilink 2000 (34-00182) Product Manual - Manual (Page 28)

2-16 I NSTALLATION
Chassis
Assembly
When operating the 2000 CSU in the 12-slot chassis, all units are powered by -48
VDC sources which are connected to the 6-position terminal strip TB2 on the rear of
the chassis. The chassis is designed with two power buses. The A bus feeds the odd
slots (1, 3, 5, 7, 9, and 11). The B bus feeds the even slots (2, 4, 6, 8, 10, and 12).
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
powers 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 corresponding
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 corresponding
terminals of power supply B (to power the even-numbered slots).
Each CSU requires a 90-mA current. Ensure that the proper fuse size is used. Refer to the
1040 Power Shelf configuration guide.