Specifications

1-8
Reference Guide
Model No.
Running Head
Chassis Types System Overview
The power enhanced chassis works in a specific environment relating to applications using
BRI cards. If your environment requires this type of configuration, notify your system
administrator for applications design and configuration setup. This chassis comes equipped
with a total of 4 power supplies: 2 regular power supplies, 1 redundant and 1 primary (both
used for load sharing). See Figure 1-5 for wiring details.
Figure 1-5. External Power Source for the Power Enhanced Chassis (891930)
1. V
NA
(+ & -) are dual -48VDC feeds for the data backplane when -48VDC is to be output
from the user card. V
NA
and V
NB
are independently protected by 8 amp fuses located on
the front panel above the TB connector.
2. V
A
(+ & -) and V
B
(+ & -) are dual feeds for the power supplies located in slots F1 & F2
respectfully (see note 3).
3. Power to V
NA
(+ & -) and V
NB
(+ & -) must be supplied or jumpered from either V
A
(+
& -) and V
B
(+ & -) if -48VDC power is required on the data backplane.
y
RGR
COM
V
NA
+
-
V
NB
+
-
V
A
+
-
V
B
+
-
RGR1NS1 RGR2 P1 P2NS2
C1 C2 P1 P2 P3 W1 W2 W3 W4 IF U1
C1 C2 P1 P2 P3 W1 W2 W3 W4 IF
U1 U2 U3 U4 U5 U6 U7 U8
U2 U3 U4 U5 U6 U7 U8
HP1 NS1 R1 HP2 NS2 R2 P1 P2
CAUTION: For continued protection
against fire, replace fuses only
with the same type and rating.
Fuse 8A
Time Delay
RGR
COM
V
NA
+
-
V
NB
+
-
V
A
+
-
V
B
+
-
U
L
®
®
Premisys Communications
Model: IMACS/900
105-240V
~ 6A 50/60 Hz
LISTED 9K09LR 77063
Telephone Equipment