ADCP-80-353 • Issue 2 • August 2002 • Section 2: Installation
Page 2-9
©
2002, ADC Telecommunications, Inc.
The
REMOTE ALARMS terminals at the back of the fuse panel provide a closed loop for
connecting
cross-connect system fuse failure alarm circuitry to an external alarm system. The
alarm
will be triggered upon failure of any fuse in the fuse panel. Each GMT fuse also has a
colored
indicator which is displayed when the fuse is blown, and the fuse panel has an LED
indicator
which lights when any fuse on the panel is blown.
Figure 2-7. Fuse Panel
3.4
Cross-Connect Jumpers
When
installing cross-connect jumpers it is important that congestion be held to a minimum.
This
will not only simplify installation, but will also provide optimal jumper tracing and ease of
system
expansion and maintenance.
The
recommended rules of jumper routing are defined in
The figure shows a three-
bay
system; however, the same basic rules apply for any number of bays. Cross-connect
jumpers
should not exceed lengths as described earlier in this section. To prevent unnecessary
buildup
and congestion, all discontinued cross-connects should be removed from the wireways.
Using
cross-connect jumpers with accompanying messenger wires, cross-connect all necessary
DSX-4U
circuits as shown in
.
1. Connect
the cross-connect OUT (XO) of the first termination to the cross-connect IN (XI)
of
the second termination. Connect the messenger wire pins of this cross-connect to tracer
lamp
pin jacks on each termination. Messenger wire pins may be inserted in either of the
pin
jacks. The two pin jacks on each module are internally connected together.
2. Connect
the cross-connect IN (XI) of the first termination to the cross-connect OUT (XO)
of
the second termination. Connect the messenger wire pins of this cross connect to the
remaining
tracer lamp pin jack on each termination.
ADC
DSX-4U cross-connect jumpers are available in various lengths from 0.3 to 8.23 m (1 to
27
feet). It is important to select the proper cable length to prevent congestion. Cross-connect
jumpers
are also available with one connector factory terminated and one connector kit which is
terminated
on site. This method allows jumpers to be cut to the exact length required,
eliminating
excess jumper buildup.
Disconnect
any discontinued cross-connect jumpers at each end and remove them from the
wireways.
FRONT VIEW
USE
3 AMP
FUSE
MAXIMUM
50 AMP
MAXIMUM
TOTAL BUSS
AMPERAGE
BLOWN FUSE
INDICATOR
4
8
12
16
2389-B
REAR VIEW
REMOTE ALARMS
NEG (-)
POS (+)
1-10
11-20
1-10
11-20
–
48V
ONLY
NEG (–)
BUS
POS (+)
BUS
GND
A
B
C
D
E
F
1 2 3 4 5 6 7 8 9 10
