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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

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ADTRAN T1-FT1 Manual do Utilizador Página 28