5 • Troubleshooting and maintenance
Model 6511RC User Manual
88
Matrix Switch test tools
2.
At the top of the
SDH Overview
page, click the
Configuration
hyperlink to display the
SDH Configuration
page (see
figure 62
).
Figure 62. SDH Configuration page with sonetFacilityLoop(1) selected
3.
Scroll down to the
Loopback
parameter in the
SDH Interface Configuration
table.
4.
From the drop-down menu, select
sonet(facilityLoop(1)
.
5.
Click the first
Submit
button located just below the SDH Interface Parameters table.
To
deactivate
the Facility Loopback test mode, from the
LoopBack
parameter drop-down menu, select
sonet-
NoLoop(0)
and click the
Submit
button.
Terminal loop [sonetTerminalLoop(2)]
The terminal loop (see
figure 63
) returns data received from the SDH terminals back to those SDH terminals
(other ForeFront modules on the same H.110 bus). In other words, when the Terminal Loop is activated, the
Matrix Switch receives data from other ForeFront modules via the H.110 bus and transmits the (unmodified)
data back to those same modules (via the H.110 bus).
The U-turn for the terminal loop occurs within the SDH framer on the Matrix Switch. The data path for the
terminal loop traverses both the H.110 framer and the SDH framer. Data transmitted by the SDH terminals
(other ForeFront modules) enters the Matrix Switch from the H.110 bus through the mid-plane
Figure 63. Terminal loopback test mode
