61204659L1-1A 6-1
SECTION 6, LOOPBACKS
Section 6
Loopbacks
The Loopback menu shown in Figure 6-1 allows initiating loopback tests from the MX2800 STS-1. From
this menu, select VT/Port or STS-1. Once this selection is made, a second menu displays the types of tests
available.
The VT/Port menu allows selection of any port from 1 to 28. The STS-1 menu loops the STS-1 path. The
menu types, their descriptions, including diagrams of the activated loopbacks, are described in this section
as follows:
• VT/Port Loopbacks on page 6-1
• STS-1 Loopbacks on page 6-8
Figure 6-1. Loopback Menu
1. VT/PORT LOOPBACKS
After selecting the number that corresponds with the line to test, the menu in Figure 6-2 appears. The
number selected (1-28) refers to the VT number. The Port (T1/E1) that will be tested is the port mapped to
the selected VT number.
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