User's Manual

CHAPTER 6 ND-70185 (E)
Page 136
Revision 3.0
POST INSTALLATION TEST
Repair Procedure When LED Indicates Abnormality
All 24 B-channels sent from the TSW are looped back to the TSW at Interface on the card. At this
time, the adjacent node detects AIS signals. (See ①
① ①
① in the figure below.)
2. Line Loopback
All 24 B-channels sent from the line are looped back to the line at Line Interface on the card. (See
② in the figure below.)
3. Payload Loopback
All 24 B-channels sent from the line are looped back to the line at Speech Path Control Block on
the card. (See ➂ in the figure below.)
Figure 6-4 Loopback Points of DTI Card
TDSW Interface
TDSW Interface
PAD
PAD
Speech Path Control Block
Speech Path Control Block
Framer
Framer
Line Interface
Line Interface
Payload
loopback
External loopback
(Line Loopback)
Internal
Loopback
FCH card
DTI pkg
1
2
3
FUSION
Network
Self-Node
Other Node
front cable
Sending Test
Data Pattern
Analysis Method
Result of ➀ NG: Self-Node has errors
Result of ➀ OK, ➁ NG: Line has errors
Result of ➀ OK, ➁ OK: ➂ NG: Other Node has errors