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Electra Elite
ESI(8)-U( ) ETU
or MBD-U10 Unit
AC Voltage (117 Vac)
Live to Neutral
Live to Conduit Ground
Neutral to Conduit Ground
Ring Generator (SLT)
CO Line
Off-hook line current
* Ring voltage may be lower if the meter measures only 60 Hz signals.
System Hardware Manual
Table 10-1 Voltage Measurement
Voltages
+5V
–24V
3.2.3
Initialization Check
To determine if the system is initializing correctly, only the
KSU and terminals should be installed on the system.
After initialization, all the terminals assigned to the
ESI(8)-U( ) ETU that is mounted on the MBD-U10 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
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 process, each
station display shows default time and date indications.
For example:
Tolerance
+5 ± 0.25V
–26 ~ –28V
117 Vac ± 15%
117 Vac ± 15%
117 Vac ± 15%
0.05 Vac (maximum)
70 ~ 120 Vac @ 20 Hz *
25 ~ 50 mA
12:00 AM WED 1
Issue 6
Measuring Points
ESI(8)-U( ) or
MBD-U10 Unit TP1 +5V
TP2 GND
TP3 –24V
AC Terminal Strip
Live L to N
Live L to G
Live N to G
Across Tip and Ring of
Ringing SLT
In series with Tip side of the
CO line at the MDF
3.2 Before Initializing
are
10 - 3
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