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-48 Vdc External
Power Source
TB1
-48Vdc
35
SLOT 12
Optional Internal
-48 Vdc Power Supply
Figure 4. HRE-425 List 1 Shelf Fusing, Backplane Wiring, and Bus Connections
F
S
IELD
Connect the HDSL field side ports to the appropriate wire wrap pins of each connector. To
determine slot and pin assignments, refer to the documentation for the product being
installed.
You can also use these connections to access the two HDSL CO side Loop 1 IN and
Loop 2 IN pairs for doubler applications.
The two HDSL facilities access cables that terminate on P3 and P4 provide the necessary
XMT and RCV isolation required if the HRE-425 is used to provide access to standard T1
facilities, such as when T1 plugs like SmartJack network interface devices (NIDs) are used.
Refer to the block diagram on the rear panel for HDSL slot and pin assignments.
1
2
3
Fuse
GND
Alarm
0.5A/2A
F12
17
1
27
120 Vac Power
HDSL C
IDE
4
Frame
GND
0.5A
F11
35
S
17
L
O
1
T
27
11
ONNECTIONS
Earth
Ground
0.5A
F1
35
S
17
L
O
1
T
27
1
H0331-A
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