Specifications

Reference Guide 2-15
System Installation System Power and Ground Connections
Figure 2-9. Power Connector Block on Two-Sided Chassis and Front-Loading Chassis
with Power Supplies on the Side
If your system will be connected to voice circuits that use E&M or FX ground-start signaling,
connect the chassis ground terminal to the same chassis ground used by the external PBX or
other system. Tying the chassis grounds together will ensure proper signaling operation and
transmission between the two ends of each circuit.
2.5.2 Front-Loading Chassis with Power Supplies on the Side
Figure 2-10 shows the power and ground connections to a front-loading chassis with power
supplies on the side are the same as those shown above for the two-sided chassis. The
front-loading chassis provides the same power block terminals as the two-sided chassis.
R
G
R
+
+
+
-
-
-
V
N
V
A
V
B
C
O
M
O
ptional Telecom Ground
A
C* third wire* ground
-
48VDC Return
-
48 VDC Supply
AC PLUG
48 VDC PSU
(Note: on Optional Telecom Ground Connection:
It may be required when the 48VDC PSU output is
not grounded or when the system is AC powered. It
is only needed for the proper operation of the
Telecom Ground Start and E&M signaling circuits.
For Additional information please refer to Field Alert
Bulletin 108-000001).
POWER CONNECTIONS
-
+