ADC PG-PLUS PCU-796, Руководство пользователя, Страница: 12 / 24

Theory of Operation SCP-PCU796-010-04H
2 June 24, 2003 PCU-796 List 1
The PCU-796 is not required in Central Offices (CO) that use Nonintegrated MLT-2 systems. Figure 2 shows the
typical connections of Nonintegrated MLT-2. In this case, the Sleeve lead passes through the PGTC to the No Test
Trunk in the switch. MLT interprets -48 V on the Ring lead as
Test OK . Because the PGTC remains inactive
during PG-Plus testing, the -48 V is returned by the No Test Trunk when the MLT opens the Sleeve lead at the
end of testing.
Figure 2. Non-Integrated MLT-2