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14 61225101L1-5B
Local Customer Transparent Loopback – Provides
a loopback at the NTU in the customer direction
(Figure 14). Data is passed transparently to the
network side.
Local Network Transparent Loopback – Provides a
loopback at the NTU in the network direction (Figure
18). Data is passed transparently to the customer side.
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
TX Data
LTU
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.
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.
Figure 16. Local Customer Nontransparent
Loopback
NTU
TX AIS
LTU
Figure 17. Remote Customer Nontransparent
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.
Local Network Nontransparent Loopback –
Provides a loopback at the NTU in the network
direction (Figure 20). AIS signal is injected into the
customer side.
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
TX Data
LTU
Figure 18. Local Network Transparent
Loopback
NTU
TX Data
LTU
Figure 19. Remote Network Transparent
Loopback
NTU
TX AIS
LTU
Figure 20. Local Network Nontransparent
Loopback
NTU
TX AIS
LTU
Figure 21. Remote Network Nontransparent
Loopback
NTU
TX Data
LTU
NTU
TX AIS
LTU