4-12
Diagnostics
GDC 048R154-000
Figure 4-7
Data Path for Network Line Loopback
Figure 4-8
Network Line Loopback, Front Panel Control
Network
DTE
Interface
Network
Interface
DeskTop T1 DSU
DTE or
other
signal
source
When DSU is optioned for bilateral loopbacks (switch S10-4)
a DTE Local Loopback is also initiated when Network Line
Loopback is commanded.
Network Line Loopback
2. Press LL switch to start Network Line
Loopback. Press switch again to end
test.
1. T1 indicator must be On; press T1
switch if indicator is not already On.
3. TM, T1, and LL indicators are
On during the test.
General Data-
Comm
DeskTop
T1
ON
SD
RD
OOF LOS BPV ALM
TM
T1
ST
LL
RL
