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Matrix Switch test tools 89
Model 6511RC User Manual 5 • Troubleshooting and maintenance
connections. The data passes through the H.110 framer, then traverses the SDH framer where it loops back,
passing through the H.110 framer again. The data leaves the Matrix switch through its mid-plane connections
and returns via the H.110 bus to the sending SDH terminals (other ForeFront modules).
The terminal loop affects only those DS0s that are mapped from the H.110 bus to the STM-1 link or from the
STM-1 link to the H.110 bus. Likewise, the loop affects only those ForeFront modules included in one or
more such DS0 mappings.
The terminal loop exercises the physical and logical connections between the Matrix Switch and the other
ForeFront modules connected to the same H.110 bus (its SDH terminals). You can use the terminal loop to
test and troubleshoot the DS0 mappings you have defined while simultaneously testing H.110 bus connectiv-
ity with other ForeFront modules via the chassis mid-plane.
To activate the Terminal Loop test mode:
1. On the configuration menu, click the SDH hyperlink to display the SDH Overview page.
2. At the top of the SDH Overview page, click the Configuration hyperlink to display the SDH Configuration
page (see figure 64).
3. Scroll down to the Loopback parameter in the SDH Interface Configuration table.
4. From the drop-down menu, select sonetTerminalLoop(2).
5. Click the first
Submit
button located just below the SDH Interface Parameters table.
Figure 64. SDH Configuration page with sonetTerminalLoop(2) selected
To deactivate the terminal loop test mode, from the LoopBack parameter drop-down menu, select sonet-
NoLoop(0) and click the
Submit
button.