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CHAPTER 3 INSTALLATION PROCEDURE
1. PRECAUTIONS
1.1 Power, Ground Cabling and LIU (for Australia)
(a)
The power and ground cabling is to be installed only by an AUSTEL Licensed Contractor.
(b)
The G.P.O. which provides the AC power should be on a dedicated circuit, and must be installed near the
PABX in an easily accessible position.
(c)
An appropriate AUSTEL Approved Line Isolation Unit (LIU) is to be installed at I/O ports, as indicated in
Figure 2-1.
1.2 Grounding Requirements
The system protective grounding must have a specific resistance and AC noise level, and is to be connected to a
pre-determined terminal in the PABX, by use of a custom-built AC power cord. The TRC Earth connects to the
"GND" terminal on the PZ-PW86 power unit in every PIM.
Standard grounding requirements are as shown below:
• Communication grounding: Less than 1 ohm. See figure 3-1 below.
• Protective ground for PIM: Less than 1 ohm. [Provided in the AC power cord(s)].
• Grounding to the Line Protection units on the MDF: Less than 0.1 ohm
Note: The AC ripple on these various grounds should be less than 0.5 Vp-p.
CAUTION
Grounding circuit continuity is vital for safe operation of telecommunication equipment. Never operate this
equipment with the grounding conductors disconnected.
CHAPTER 3
Page 10
Revision 1.0.1
GND
PIM3
GND
PIM2
GND
PIM1
GND
PIM0
Figure 3-1 TRC Earth Wiring
PZ-PW86
PIM7
PZ-PW86
PIM6
PZ-PW86
PIM5
PZ-PW86
PIM4
AD-25182501
PZ-PW86
GND
PZ-PW86
GND
PZ-PW86
GND
PZ-PW86
GND
TO TRC EARTH.
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