Loopback Point Designation; Test Procedure; Figure 6-4 Loopback Points Of Dti Card - NEC NEAX 2400 IPX Manual

POST INSTALLATION TEST
Repair Procedure When LED Indicates Abnormality
2.2.2

Loopback Point Designation

The DTI card can be set at one of the following loopback points:
1. Internal Loopback
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
2. Line Loopback
All 24 B-channels sent from the line are looped back to the line at Line Interface on the card. (See
in Figure
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
S elf-N ode
D T I pkg
front cable
S ending Test
D ata P attern

2.3 Test Procedure

STEP 1: Set the MODE switch to 9 (Fusion Link Test) from 8 (standard setting) on the FCH card, and initialize
the circuit card by turning the MB switch ON→OFF. Refer to
CHAPTER 6
Page 148
Revision 1.0
6-4.)
in Figure 6-4.)
1 Internal
Loopback
Analysis M ethod
R esu lt of (1 )
F C H card
R esu lt of (1 )
R esu lt of (1 )

Figure 6-4 Loopback Points of DTI Card

in Figure
2
FU S IO N
N etw o rk
N G:
O K, (2) NG:
O K, (2) OK: (3) NG: O ther N ode h a s errors
NDA-24299
6-4.)
E xternal loopback
3 Payload
(Line Loopback)
loopback
Self -N od e has e rrors
Line has errors
Figure 6-5.
O ther N ode