Chapter 4. Installing the IDU
Vol. III-4-4 Alcatel-Lucent
Installing an IDU
To install an IDU:
1. Fit the rack mounting ears to the IDU. Position the ear with the grounding stud
to left or right side for the most direct ground wire path to the rack ground bar.
2. Locate the IDU in the equipment rack and secure it using four No.12 Phillips
dome-head screws from the IDU installation kit.
3. Ground the IDU from the ground stud to the rack/frame ground bar using a
length of 4 mm
2
(AWG 12) green PVC insulated stranded copper wire with a
suitably sized ground lug at each end (supplied by installer).
4. If the equipment rack/frame requires grounding use 16 mm
2
(AWG 6) wire
from its ground bar to the station ground.
5. Fit the optional jumper cable, or make up a suitable cable from the IDU to the
suppressor installed at the point of cable entry to the building. Refer to Jumper
Cables on page 2-23 in Chapter 2.
6. Secure the cable within the rack/frame using cable ties or similar. Do not
over-tighten cable ties.
7. Fit interface cables. For information on tributary, Ethernet and auxiliary cable
sets, refer to Appendix C.
Steps 8 to 13 describe the procedure for preparing the power cable, and preparing
for power-on. Do not connect the power until all steps have been completed
(leave the power connector disconnected or ensure the fuse holder is in the off,
horizontal ‘0’ position).
8. Run the supplied power cable through to the power pick up point, which will
normally be at a circuit breaker panel in the rack. A circuit breaker (or fuse)
must have a capacity of 5 A.
9. Connect the blue (or red) wire to -48 Vdc (live), and the black wire to ground/
+ve. The power input is polarity protected.
10. Measure the voltage on the dc power connector. The voltage should be
Do not assume that an existing rack or mounting frame is correctly grounded.
Always check the integrity of the ground connections, which must include a check
through to the master ground for the station, which should be located at the point
of cable entry to the equipment building.
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