Call Dropping - NEC ElectraElite 48 System Hardware Manual

Electra Elite
Check COI(8)-U( ) LED.
COI(8)-U( )
LED Status
?
On
Have Telco check
Line circuit(s).
System Hardware Manual
No
Check outside line key
indication after call drops.
CO
On
Line Key
LED Status
?
Off
1. Perform Second Initialization.
If trouble persists go to step 2.
2. Replace COI(8)-U( ) ETU. Test.
C2

Call Dropping

See if problem is
on all lines.
Yes
Calls
dropped on
all lines?
No
Have Telco check line circuits.
Off
Increase Automatic Release
Signal Detection Time. Refer
to Memory Block 3-40.
No
Problem
Solved?
Yes
Return defective ETU
for repair.
Yes
All
lines drop
together?
Check DC voltages
with a meter and AC
power with
disturbance analyzer.
Perform First Initialization.
Replace B48-U10 KSU,
and test system using
default program.
Issue 6
a line
10 - 11