ADTRAN T1-FT1 Bedienungsanleitung Seite 28

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Chapter 1. Introduction
1-12 TSU User Manual 61200060L1-1
Network Loopbacks
There are two types of network loopbacks; see Figure 1-7.
Line Loopback: loops all of the received data back
toward the network. The transmitted data is the identical
line code that was received, including any bipolar
violations or framing errors.
Payload Loopback: similar to Line loopback, except that
the framing is extracted from the received data and then
regenerated for the transmitted data.
Figure 1-7. Network Loopback Tests
TSU
DS1
NI CSU
Payload Loopback
Line Loopback
Interface
V.35
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