ADTRAN Total Access 1240, Установка и эксплуатация, Страница: 28 / 146

Total Access 1240 Installation and Maintenance Practice
3-6 61179605L5-5B
GROUND AND POWER CONNECTIONS
The Total Access 1240 provides redundant power inputs. Two sources of
–
48 VDC must be
provided to use the redundant power feature. The power wire must be 12 to 18 AWG stranded
copper. The ground wire must be 12 to 18 AWG, however, it must be as large or larger than
the wire used for power.
Ground Connection
The Total Access 1240 must be grounded to a reliable grounding source. To connect the
ground wire, perform the following steps:
1. Connect the ground wire (fitted with a loop terminal end) to the ground lug on the front of
the Total Access 1240, as shown in Figure 3-4 .
2. Clean the surface of the frame ground source and apply an appropriate antioxidant.
3. Connect the other end of the ground wire to the grounded frame.
4. Using an ohmmeter, verify continuity between the ground lug and a known good frame
ground. The reading should be less than 1 ohm.
Figure 3-4. Ground Connection