Nortel DMS 100 Series Maintenance Manual page 27

Table 2-7 NTRX42AA output specifications (Sheet 2 of 2)
Parameter
Maximum current
Minimum current
Fan power control module
The fan power control (FPC) (NTRX54BA) receives A- and B-feed inputs
from the PDC. The FPC provides a combined C-feed for the 48 Vdc fans and
an alarm output. The circuit card can operate at -48 Vdc and -60 Vdc input in
a central office (CO) environment.
The NTRX54BA circuit card includes two faceplate-mounted fuse holders that
have 5-A fuses and an LED. A captive screw on the faceplate provides positive
retention and conductive coupling to the shelf.
Location
positions in an MSP. The NTRX54BA circuit card is fully connectorized. The
NTRX54BA circuit card provides A- and B-feed input through two 6.35 mm
(0.25 in.) quick-connect plugs (A0381899). The circuit card also provides
power/alarm output through an 18-pin Positronics power-lock connector
(A0380977).
The main function of the NTRX54BA circuit card is to provide a small
regulated 48V for fan operation. Features include:
• fuse failure alarm
• redundant feed operation
The following figure shows the relationship of NTRX54BA circuit card
functional blocks.
Figure 2-3 NTRX54BA functional blocks
48A
48B
DMS-100 Family Remote Switching Center Multi-Access Maintenance Manual XPM11 and up
The NTRX54BA circuit card occupies the last two-card
Fuses and
redundancy
Maintenance overview 2-11
Value
2 x 10A
0A
Fuse fail alarm
LED
Fan-feed (feed C)