Specifications

Reference Guide
1-7
System Overview Chassis Types
1.2.3 Front-Loading Chassis with Enhanced Power Supply (891930)
Figure 1-4 shows the front-loading chassis that uses the 8908 enhanced power converter. This
is a tall chassis in which the two power supply slots are in the upper right. This chassis is made
of steel and has improved “v” design card guides that protect the electrical traces of all cards
from contact with the chassis. This chassis is designed for table top, wall or rack mounting.
All access (cable and card) is from the front of the chassis.
This chassis has three server card slots (P1 to P3), four WAN card slots (W1 to W4), and eight
user card slots (U1 to U8). Slots F1 and F2 accommodate up to two power supplies
(8901/8902), and slots R1 and R2 hold up to a maximum of two ring generators
(8906/890620). The chassis also includes two low power AC-to-DC converters (NS1, NS2)
(8903/8905) and a maximum of two high power AC-to-DC converters (HP1, HP2) (8908).
Cannot mix High/Low Power Converters in the Power Enhanced Power Chassis.
Table 1-3 shows the card slots for the front-loading chassis with the power supplies on top.
Use that table to determine your chassis card configuration.
Figure 1-4. Power Enhanced Chassis (891930)
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