2. Cabling
4200-A2-GN21-30 June 2004
2-13
Using Two DC Power Sources for Power Redundancy
Procedure
✔ Make sure that the DC power source wires are not powered (that is, the circuit
breakers are open).
✔ The ends of the power source wires (18–14 AWG or 0.75–2.5 mm
2
solid or
stranded wire) must be stripped of insulation to about 1/2 inch (13 mm) in
length before inserting the wires into the appropriate terminal on the –48/–60V
input terminal block.
To supply two DC power sources to the GranDSLAM 4200 for power redundancy:
1. Insert the following wires in the appropriate terminal and securely fasten each
wire by tightening the screw directly above it. The insulation should be fully
within the terminal block and no bare wire should be exposed outside of the
block.
2. Clearly label these four power source wires as –48V A (or –60V A), RTN A,
–48V B (or –60V B), and RTN B.
3. If the unit is in a rack, dress the power cables to the left and fasten them to the
rail with a cable tie.
4. Turn on power to the GranDSLAM 4200.
5. Make sure the STATUS LED on the front panel is ON (green). See Chapter 3,
LEDs.
Insert Power Source . . . Into the . . .
Negative side of the first power source
(Power Source A)
–48/–60V A input terminal.
(Optional) Negative side of the second
power source (Power Source B)
–48/–60V B input terminal.
Positive side of the first power source
(Power Source A)
Left RTN (return) terminal.
(Optional) Positive side of the second
power source (Power Source B)
Right RTN (return) terminal.
