Hardware manual

Electra Elite Issue 8
System Hardware Manual 10 - 3
3.2.3 Initialization Check
To determine if the system is initializing correctly, only the
Basic KSU, CPUB( )-U( ) ETU, one ESI(8)-U( ) ETU, and
terminals should be installed on the system. After
initialization, all the terminals assigned to the ESI(8)-U( )
ETU can be used for internal calls to one another. (By
default, these stations are assigned station numbers
100~107).
3.3 System Initialization
After the steps described in Section 3.2 Before Initializing are
performed and verified, the entire system should be initialized.
With power OFF, all interface and option cards can be installed in
the basic KSU. The technician can then power up the system to
perform a First Initialization. After the initialization, each station
display shows default time and date indications.
For example:
Table 10-1 Voltage Measurement
Voltages Tolerance Measuring Points
ESI(8)-U10 ETU
+5V
–-24V
+5 ± 0.25V
–24 ± 0.25V
ESI(8)-U10 TP1 +5V
TP2 GND
TP3 –24V
AC Voltage (117 Vac)
Line to Neutral
Line to Conduit Ground
Neutral to Conduit Ground
117 Vac ± 15%
117 Vac ± 15%
.05 Vac (maximum)
AC Terminal Strip
Line L to N
Line L to G
Line N to G
Ring Generator (SLT)
70 ~ 120 Vac @ 20 Hz *
Across Tip and Ring of
Ringing SLT
CO Line
Off-hook line current
25 ~ 50 mA In series with Tip side of the
CO line at the MDF
* Ring voltage may be lower if the meter measures only 60 Hz signals.