The DS1 media module has four status LEDs on the faceplate in addition to the three standard faceplate LEDs. These four status LEDs are associated with the 120A channel Service Unit (CSU) Module that can be connected to the DS1 board via the I/O connector panel on the back of the port carrier.
This test is a visual test. It lights the four status LEDs red for 5 seconds, green for 5 seconds, and yellow for 5 seconds. It then turns the LEDs off and returns control of the status LEDs to the media module.
The DS1 media module, combined with the 120A CSU module or the 401A T1 sync splitter, forms an Integrated CSU (ICSU).
If the 120A CSU module/T1 sync splitter is not installed, the status LEDs are always off and this test aborts.
This test is run on the following maintenance object:
