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Tests
3. Enter test data at the DTE. Compare data entered at the DTE with data
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
Figure 4-13
Remote
Device
Figure 4-14
4-12
looped back and displayed by the DTE. (Test equipment connected to the
Line jacks can be used in place of the DTE.)
DTE
Inter-
HELLO
face
2. TM indicator On while Local Test loopback is active.
1. To start test from front panel, press T1 momentary action switch.
T1 indicator is lit during the test.
Press switch again to end the test.
T1 Local Test, Network Interface
Cascade Interface
Analog
Receiver
Framer
TX
Driver
DTE
Interface
T1 Local Test, Cascade Interface
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
SC 553 DSU
TX
Driver
Framer
Analog
Receiver
SC 553 DSU
Network Interface
TX
Driver
Framer
Analog
Receiver
T1 Tests
Network
Network
076R155-000
Issue 7
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