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Tests
ON
INS
I
L
N
I
N
O
E
U
T
RSP
SD
RD
EQ
BPV AIS
OOF NS
TM ALM
T1
CH
RL
TX
M
O
RX
N
553
TPG
DTE
Inter-
face
TPC
TPG = Test Pattern Generator
TPC = Test Pattern Checker
Figure 4-16
4-14
2. TM indicator On during test. Blinks to indicate a detected error.
Lit steadily while pattern is received correctly.
1. To start the test from the front panel, press RL and hold for
2 seconds. RL indicator is lit during the test.
Press switch again to end the test.
SC 553 DSU
TX
Driver
Framer
Network
Analog
Receiver
Channel Remote Digital Loop with Self Test
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
Channel Tests
Remote DSU
Analog
Receiver
DTE
Inter-
Framer
face
TX
Driver
076R155-000
Issue 7
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