Network loopbacks -12, Figure 1-7 – ADTRAN T1-FT1 User Manual
Page 28
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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