ADTRAN SHDSL NxNTU specifications Local Customer Transparent Loopback Provides

Local Customer Transparent Loopback – Provides

a loopback at the NTU in the customer direction (Figure 14). Data is passed transparently to the network side.

NTU TX Data LTU

Figure 14. Local Customer Transparent

Loopback

Remote Customer Transparent Loopback –

Initiated at the NTU and provides a loopback at the LTU in the customer direction (Figure 15). Data is passed transparently to the network side.

NTU LTU

TX Data

Figure 15. Remote Customer Transparent

Loopback

Local Customer Nontransparent Loopback – Provides a loopback at the NTU in the customer direction (Figure 16). AIS signal is injected into the network side.

NTU TX AIS LTU

Figure 16. Local Customer Nontransparent

Loopback

Remote Customer Nontransparent Loopback – Initiated at the NTU and provides a loopback at the LTU in the customer direction (Figure 17). AIS signal is injected into the network side.

NTU LTU

TX AIS

Figure 17. Remote Customer Nontransparent

Loopback

Local Network Transparent Loopback – Provides a

loopback at the NTU in the network direction (Figure 18). Data is passed transparently to the customer side.

NTU	LTU
TX Data

Figure 18. Local Network Transparent

Loopback

Remote Network Transparent Loopback – Initiated at the NTU and provides a loopback at the LTU in the network direction (Figure 19). Data is passed transparently to the customer side.

NTU LTU TX Data

Figure 19. Remote Network Transparent

Loopback

Local Network Nontransparent Loopback – Provides a loopback at the NTU in the network direction (Figure 20). AIS signal is injected into the customer side.

NTU	LTU
TX AIS

Figure 20. Local Network Nontransparent

Loopback

Local Network Nontransparent Loopback – Initiated at the NTU and provides a loopback at the LTU in the network direction (Figure 21). AIS signal is injected into the customer side.

NTU LTU TX AIS

Figure 21. Remote Network Nontransparent

Loopback

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