4-20
Diagnostics
GDC 048R154-000
Figure 4-17
Data Path for DTE Local Loopback
Figure 4-18
DTE Local 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 Network Payload Loopback is also initiated
when DTE Local Loopback is commanded.
DTE Local Loopback
2. Press LL switch to start DTE Local
Loopback Test. Press switch again to
end test.
1. T1 indicator must be Off; press T1
switch if indicator is On.
3. TM 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
