Field Side Hdsl Connections - ADC HRE-425 List 1 User Manual

150-425-100-04
Figure 9 shows the slot-pin assignments for the ERU-412.
Only the 120Ω, G.703 ERU should be used in the HRE-425. The 75Ω, G.703 ERU should not be
used because its 75 Ω interface requires BNC connectors that are not available in the HRE-425.

Field Side HDSL Connections

Connect the HDSL field side ports to the wire-wrap pins of each connector (see above
Figure 8, and Figure 9
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 HDSL 1 designation refers to Loop 1 and HDSL 2 to Loop 2. If these leads are reversed, a
CHREV message is displayed in the ALARMS display field when viewing the HiGain Status
screen. This condition does not affect system operation, but should be corrected to avoid any
confusion regarding the identities of the two HDSL loops.
HRE-425 List 1
56 55 TIP
54 53
52 51
RING
50 49
48 47 HDSL2 RING1
45
46
44 43
42 41 HDSL2TIP 1
40 39
38 37
36
35
34 33
32 31
30 29 -
28 27
48V LOCAL
POWER SUPPLY
26 25
+
24 23
22 21
20 19
18 17 CIRCUIT GROUND
16 15
RING1
14 HDSL1 RING
13
12 11
10 9
8 7
HDSL1TIP
6 5 TIP1
4 3
2 1 CHASSIS GROUND*
* CHASSIS GRND MAY BE TIED TO
EARTH GRND PER LOCAL PRACTICE
Figure 9. ERU-412 Pin Assignments
for representations of slot-pin assignments).
September 22, 1999
120-OHM
G.703 XMT
DB 15
120-OHM
G.703 RCV
DB 15
H0339-A
Figure 5, Figure 7,
11