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Sub Rate Data Ports 8-7

SRU Ports SRU port User Screens and Settings

The Loopback setting allows you to activate local loopbacks on the SRU port. These settings

are off, toward the dte (DTE), and toward the net (network). Figure 8-3 shows a diagram of

the local loopback conditions.

Figure 8-3. Local Loopbacks

LB GEN

The Loopback Generate setting generates inband diagnostic codes that are sent to the remote

equipment These codes are compatible with DDS networks, and allow you to command a

latching loopback at remote DDS equipment. You can start loopbacks at the remote ocu

(Office Channel Unit), dsu (Data Service Unit), or csu (Channel Service Unit). Figure 8-4

through Figure 8-5 show the loopbacks locations. You can also turn each loopback off.

Note that loop-up and loop-down commands cannot be implemented for two ports of the same

port simultaneously. You must finish all loopback operations on one port before attempting

them on another port.

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