ADC PG-PLUS PCU-796, Руководство пользователя, Страница: 13 / 24

SCP-PCU796-010-04H Description and Features
PCU-796 List 1 June 24, 2003 3
The differences in the Integrated MLT-2 case are shown in Figure 3. Here the PCU-796 is necessary because a
No Test Trunk is not present in this set-up. The PCU-796 monitors the unconnected Sleeve lead and responds with
-48 V battery coupled through a resistor to the Trunk Ring lead when the MLT opens its Sleeve lead at the end of
testing. The -48 V is interpreted as
Test OK by the I-MLT-2 even though the PGTC was inactive. The PCU-796
does not interfere with other digital loop carrier (DLC) devices that activate the PGTC. When the PGTC is active,
the opening of the Sleeve lead by I-MLT-2 at the end of test is not passed through the PGTC. Thus, the PCU-796
remains inactive and does not apply -48 V in this case.
Figure 3. Integrated MLT-2 Using PCU-796
D
ESCRIPTION AND
F
EATURES
PGTC Conditioner Unit
The PCU-796 Conditioner Unit allows PG-Plus systems to correctly interface with a Pair Gain Test Controller
when used in conjunction with an Integrated MLT-2. The PCU-796 is not required when MLT-2 is external to the
switch. One PCU-796 is applied per PGTC (I-MLT-2 cases only), which then allows an unlimited number of
PG-Plus systems to be deployed. The PCU-796 has no affect on other systems that also use the PGTC and
I-MLT-2 connections.