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Table 2. Card Edge Pin Assignment
P
n i
D
e
s
g i
n
t a
o i
n
1
G
N
D
2
N
C
3
T
1
4
R
1
5
T
1
6
R
1
7
N
C
8
T
9
R
0 1
G
N
D
1 1
T
2 1
R
NOTE:
These capacity guidelines were generated
through extensive testing per Bellcore
guidelines GR-487-CORE, requiring units
to
operate
normally
temperatures up to 47
loading.When installing the ADTRAN 239
HRE, refer to the ADTRAN Installation/
Maintenance practice for the housing being
used.
CAUTION:
For use in other housings, the HRE
dissipates a maximum of 3.5 watts.
The ADTRAN 239 HRE is designed for deployment
using any 239-type repeater case. A retainer patch
is available for use with the 239 HRE for securing
into the ADTRAN apparatus cases.
3. FACEPLATE FEATURES
The ADTRAN Low Voltage HRE faceplate has five
LEDs indicating diffrent states of the HDSL circuit.
Table 4 and 5 explains the meaning of the diffrent
LED indicators.
4. DEPLOYMENT GUIDELINES
The ADTRAN HDSL system is designed to provide
DS1 based services over loops designed to comply
61246045L1-5B
D
e
s
c
i r
t p
o i
n
G
r
u o
d n
N
o
C
n o
e n
t c
C
s u
o t
m
r e
L
o
p o
1
T
p i
C
s u
o t
m
r e
L
o
p o
1
i R
g n
N
e
w t
o
k r
L
o
p o
1
T
p i
N
e
w t
o
k r
L
o
p o
1
i R
g n
N
o
C
n o
e n
t c
N
e
w t
o
k r
L
o
p o
2
T
p i
N
e
w t
o
k r
L
o
p o
2
i R
g n
G
r
u o
d n
C
s u
o t
m
r e
L
o
p o
2
T
p i
C
s u
o t
m
r e
L
o
p o
2
i R
g n
at
ambient
°
C, with
solar
Section 61246045L1-5, Issue 2
with Carrier Service Area (CSA) guidelines. CSA
deployment guidelines are given below.
1. All loops are non-loaded only.
2. For loops with 26-AWG cable, the maximum
loop length including bridged tap lengths is 9
kft.
3. For loops with 24-AWG cable, the maximum
loop length including bridged tap lengths is
12 kft.
4. Any single bridged tap is limited to 2 kft.
5. Total bridged tap length is limited to 2.5 kft.
6. The total length of multi-gauge cable
containing 26-AWG cable must not exceed:
12 - {(3*L26)/(9-L
L26
= Total length of 26-AWG cable
excluding bridged taps (in kft)
LBTAP= Total length of all bridged taps
(in kft)
This deployment criteria is summarized in the chart
shown in Figure 2.
Recommended maximum local loop loss
information for PIC cable at 70°F, 135Ω, resistive
termination is provided in Table 6.
An approximation for the maximum amount of
wideband noise on a DSL local loop as measured by
a 50 kbps filter is ≤ 31 dBrn.
An approximation for the maximum level of
impulse noise as measured using a 50 kbps filter on
an DSL loop is ≤ 50 dBrn.
These approximations are to be used as guidelines
only and may vary slightly on different loops.
Adhering to the guidelines should produce
performance in excess of 10
5. MAINTENANCE
The ADTRAN 239 HRE requires no routine
maintenance. In case of equipment malfunction,
perform an in-band loopback from the central office
(CO), as defined in Appendix A. If a malfunction
is confirmed, replace the unit.
The ADTRAN 239 HRE has looping capability
through the channel allowing digital loopback in
fault isolation. The looping is accomplished
remotely as defined in Appendix A of this practice.
BTAP
)} (in kft)
-7
BER.
3
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