Toshiba Strata DK 280 Installation Manual page 642

Flowchart 11-2
No Synchronization
Start
7
Possible causes: No
carrier from far end;
t
-----
defective CSU, NIU, or
RDTU; cable problems.
w
Check RDTU/CSU/NIU
cabling per Subsection 11.54.
Run DK280 system programs
per Section 11.4.
Correct as necessary.
from TELCO line, notify the
Tl provider. You should also
-mm---
Perform RDTU self test
per Section 11.6.
Perform the CSU local loop back test. In this test the RDTU loop
back jumpers remain off and the CSU is placed in the local loop
Perform the CSU network loop
back test per Figure 1 l-l 0.
Perform RDTU Network loop back
tests per Figures 11-8 and 11-9.
then replace CSU.
NO , Recheckcables,
then replace CSU.
Contact the Tl provider (carrier) and request them to perform a point-to-point,
technical support group.
DK0524
11-18
January 1996