General Information; Before Initializing; Cable Connections - NEC Electra Elite IPK II System Hardware Manual

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Document Revision 3
___________________________________________________________________________________
S
3
O
ECTION
PERATIONAL
3.1
3.2
ESI(8)-U( ) ETU
+5V
–-24V
AC Voltage (117 Vac)
Line to Neutral
Line to Conduit Ground
Neutral to Conduit Ground
Ring Generator (SLT)
CO Line
Off-hook line current
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14 - 2
T
P
EST
ROCEDURES

General Information

When an Electra Elite IPK II system is first powered up, an initialization is
performed. During this process the CPUII( )-U( ) ETU, located in the Basic
KSU, scans each interface slot to determine the hardware configuration used.
This information is stored in the resident system program memory with the
system default values. This section provides test procedures that are used
before, during, and after the initialization process.

Before Initializing

The technician must follow these steps before initializing the system.
3.2.1

Cable Connections

All wiring for power supplies or flat cable connectors should be
checked for solid connections.
3.2.2
AC/DC Power
Check all power with an AC/DC multimeter. (Refer to
Voltage
Measurement.) Run this test with only the CPUII( )-U( ) ETU
and the ESI(8)-U( ) ETU installed.
Table 14-1 Voltage Measurement
Voltages
Tolerance
+5 ± 0.25V
–24 ± 0.25V
117 Vac ± 15%
117 Vac ± 15%
.05 Vac (maximum)
70 ~ 120 Vac @ 20 Hz
Ring voltage

may be lower
if the meter
measures only
60 Hz signals.
25 ~ 50 mA
Electra Elite IPK II
Table 14-1
Measuring Points
ESI(8)-U( ) ETU
TP1
TP2
TP3
AC Terminal Strip
Line L to N
Line L to G
Line N to G
Across Tip and Ring of Ringing
SLT
In series with Tip side of the CO
line at the MDF
System Maintenance
+5V
GND
–24V

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