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Section 5, User Interface - Menu Descriptions
61179605L5-5B 5-85
Local Dual-Sided Loopback
The local dual-sided loopback provides a bidirectional loopback at the Line Termination Unit
(LTU), as shown in Figure 5-64.
Figure 5-64. Local Dual-Sided Loopback
Local Customer Loopback
The local customer loopback provides a loopback at the LTU in the customer direction, as
shown in Figure 5-65. An Alarm Indication Signal (AIS) is injected into the network side.
Figure 5-65. Local Customer Loopback
Local Network Loopback
The local network loopback provides a loopback at the LTU in the network direction, as shown
in Figure 5-66. An AIS signal is injected into the customer side.
Figure 5-66. Local Network Loopback
LTU NTU
LTU
TX
AIS
NTU
LTU
TX AIS
NTU