STS-1
Analog Network
An
to the network (STS-1). The T1/E1 is completely de-multiplexed,
looped back at the T1/E1 line interface unit (LIU) through the LIU
drivers and receivers, and multiplexed back onto the STS-1
network stream. See Figure 6-4 for an illustration of this test.
STS-1
LIU
61200659L1-1
STS-1
MAPPER
LIU
A
N
NALOG
ETWORK
STS-1
MAPPER
MX2800 STS-1 User Manual
CODEC
T1/E1 LIU
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CODEC
T1/E1 LIU
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Figure 6-3. Tributary Loopback Test
loopback test loops the selected T1/E1 back
CODEC
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CODEC
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Figure 6-4. Analog Network Loopback
Chapter 6. Diagnostics
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T1/E1 LIU
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T1/E1 LIU
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6-3