Hdsl4 Deployment Guidelines; Figure 22. Hdsl4 Circuit Segments; Table 5. Hdsl4 Loop Insertion Loss Values; Table 6. Single Span And First Segment Of Repeatered Loop - ADTRAN H4TUC 3192 Installation And Maintenance Practice
Hdsl4 transceiver unit for the central office
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6. HDSL4 DEPLOYMENT GUIDELINES
The different segments of an HDSL4 circuit are
defined in Figure 22.
H4TU-C
1st H4R
1st Segment
2nd Segment
Figure 22. HDSL4 Circuit Segments
Range Calculations
The ADTRAN HDSL4 system provides DS1-based
services over loops designed to comply with the
guidelines given below. These guidelines apply to a
single segment circuit, or an HDSL4 circuit with no
H4Rs; to a circuit having two segments (with one
H4R); or to a circuit having 3 segments (with two
H4Rs).
According to the number of H4Rs in the HDSL4
circuit, the following service ranges apply:
• An HDSL4 circuit containing no H4Rs will reach
up to 15,250 ft. on the local loop (24 AWG)
[10,800 ft for 26 AWG].
• An HDSL4 circuit containing one H4R will reach
up to 15,250 ft on the first segment and 15,050 ft
on the second segment (24 AWG) [10,550 ft for
26 AWG].
• An HDSL4 circuit containing two H4Rs will
reach to 12,000 ft. on the first segment, 13,500 ft.
on the second segment, and 15,000 ft. on the
third segment (24 AWG). *
*This is one example of a circuit with two H4Rs.
Other loop length configurations are possible in
compliance with loop resistance restraints.
1. All loops are nonloaded only.
2. Any single bridged tap is limited to 2 kft.
3. Total bridged tap length is limited to 2.5 kft.
4. Loop Attenuation:
Upstream
1st segment
31 dB
2nd segment
30 dB
3rd segment
30 dB
5. Insertion Loss is within limits. See Table 5 for
loop insertion loss requirements.
*This is one example of a circuit with 2 H4Rs. Other
loop length configurations are possible in compliance
with loop resistance restraints.
The simplified loop qualification procedure below
provides the technician some assurance of the HDSL4
performance.
16
2nd H4R
H4TU-R
3rd Segment
Downstream
33 dB
30 dB
30 dB
Table 5. HDSL4 Loop Insertion Loss Values
t s
F
r
q e
u
n e
y c
1
S
g e
m
e
k (
H
) z
L
o
s s
d (
) B
0 5
1 3
5 .
0 8
5 3
3 .
1
0 3
9 3
1 .
1
6 9
3 4
0 .
Simplified Loop Qualification Procedure
Use Table 6 and Table 7 for the following
calculations:
For each of the measured insertion loss values,
compute the difference between the maximum loss
and the measured loss (max minus measured). If all
of the differences are positive, then the loop meets the
performance criteria. If any one of the three
difference values is negative (measured loss is more
than maximum loss), then the sum of the (differences
must be at least +3 dB (or +1 db for 2
If neither of these criteria is satisfied, then the loop is
suspect and may not provide robust HDSL4
deployment.
Table 6. Single Span and First Segment of
Repeatered Loop
F
r
q e
u
n e
y c
M
a
i x
m
u
m
k (
H
) z
L
o
s s
d (
) B
0 5
1 3
5 .
0 8
5 3
3 .
1
0 3
9 3
1 .
1
6 9
3 4
0 .
*
S
u
m
f I
a
y n
i s
g n
e l
f
e r
u q
n e
y c
n i
e s
i t r
l
s o
( s
e d
a t l
o l
s s
<
0
, )
h t
n e
t
e h
m
u
t s
e b
>
3
0 .
d
B
Table 7. Second Segment of Repeatered
Loop
F
r
q e
u
n e
y c
M
a
i x
m
u
m
k (
H
) z
L
o
s s
d (
) B
0 5
9 2
9 .
0 8
3 3
5 .
1
0 3
7 3
1 .
*
S
f I
a
y n
i s
g n
e l
f
e r
u q
n e
y c
n i
e s
i t r
l
s o
( s
e d
a t l
o l
s s
<
0
, )
h t
n e
t
e h
m
u
t s
e b
>
1
0 .
d
B
n
d
d r
t n
2
a
n
d
3
S
g e
m
e
L
o
s s
d (
) B
9 2
9 .
3 3
5 .
7 3
1 .
N
A /
nd
rd
/3
segment).
M
e
s a
r u
d e
D
l e
a t
L
o
s s
d (
L
o
s s
d (
) B
(
M
a
- x
M
a e
D
e
a t l
L
o
s s
=
n o
o l
s s
x e
e c
d e
t s
e h
m
a
i x
m
u
m
u s
m
o
t f
e h
o f
r u
e d
a t l
o l
s s
a v
u l
M
e
s a
r u
d e
D
l e
a t
L
o
s s
L
o
s s
d (
) B
(
M
a
- x
M
a e
u
m
D
e
a t l
L
o
s s
=
n o
o l
s s
x e
e c
d e
t s
e h
m
a
i x
m
u
m
u s
m
o
t f
e h
o f
r u
e d
a t l
o l
s s
a v
u l
61222404L1-5B
t n
) B
) s
s e
d (
) B
) s
s e
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