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3-2
RD (Green)
DTE Receive Data indicator
SD (Green)
DTE Send Data indicator
ON (Green)
Power On indicator
General Data-
ON
SD RD
Comm
DeskTop
T1
TM (Red)
On while DSU is any Test Mode; flashes to indicate
errors when Self Test pattern generator/ checker is
in use
T1 (Red LED & Switch)
Selects tests between T1 (LED On) and Channel
(LED Off). Selection must occur before a test is
started; cannot be changed while a test is running.
Figure 3-1 DeskTop T1 Front Panel Controls and Indicators
GDC 048R154-000
OOF (Red)
Network Out of Frame indicator
LOS (Red)
Network Loss of Signal indicator
BPV (Red)
Network Bipolar Violations indicator
OOF LOS BPV ALM
TM T1
ALM (Red)
Alarm indicator
ST (Red LED & Switch)
Selects between Self Test pattern
generator/checker On (LED On) and
Off (LED Off)
LL (Red LED & Switch)
Controls Line Loopback Test
RL (Red LED & Switch)
Controls Remote Loopback Test
Operation
ST
LL
RL
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