Analog Network; Figure 6-3. Tributary Loopback Test; Figure 6-4. Analog Network Loopback - ADTRAN 1200287L1 User Manual

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
(1 of 28) (1 of 28)
CODEC T1/E1 LIU
(28 of 28)

Figure 6-3. Tributary Loopback Test

loopback test loops the selected T1/E1 back
CODEC
(1 of 28)
CODEC
(28 of 28)

Figure 6-4. Analog Network Loopback

Chapter 6. Diagnostics
(28 of 28)
T1/E1 LIU
(1 of 28)
T1/E1 LIU
(28 of 28)
6-3