No Outside Dial Tone Access - NEC ElectraElite 48 System Hardware Manual

Issue 6
All
Yes
Terminals
affected?
Check terminals
for Internal dial
tone.
No
Internal
dial tone?
Yes
Check SW 1~8 on COI(8)-U( )
ETU for proper switch setting.
Check conduit and frame ground
to system for ground start trunks.
1. Reset and test; replace COI(8)-U( ) ETU and test. If trouble persists go to 2.
2. Perform Second Initialization. If trouble persists go to 3.
3. Perform First Initialization. If trouble persists go to 4.
4. Replace B48-U10 KSU, and test using default program.
10 - 12

No Outside Dial Tone Access

No
1. Reset terminal
and test.
2. Replace terminal.
OR
3. Reset ESI(8)-U( )
ETU and test.
4. Replace ESI(8)-U( )
and test.
Test for CO dial
tone at MDF with
test set, and check
CO wiring.
Yes
CO dial tone?
C3
Multiline
SLT
Terminal or SLT
?
Both
Check for internal
Dial Tone.
Yes
Internal
dial tone?
No
Go to Flowchart
A1.
1. Check Memory Blocks 4-07, 4-08,
and 4-19 for Station Restriction.
2. Check Memory Block 4-09 for
Telephone to Tenant Assignment.
No
Have Telco
check lines.
Check for Internal
dial tone.
No
Internal
dial tone?
Yes
1. Perform Second
Initialization.
2. Reset and test
SLI(4)/(8)-U( )ETU.
3. Replace and test
SLI(4)/(8)-U( ) ETU.
Go to Flowchart A1.
Leave SLI(4)/(8)-U( )
and one ESI(8)-U( )
ETU installed.
System Maintenance
Electra Elite