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6. HDSL DEPLOYMENT GUIDELINES
The ADTRAN HDSL system is designed to provide
DS1-based services over loops designed to comply
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 the following:
12 - {(3*L
26
)/(9-L
26
L
= Total length of 26-AWG cable
excluding bridged taps (in kft)
BTAP
L
= Total length of all bridged taps (in kft)
This deployment criteria is summarized in the chart
shown in Figure 19.
12
11
INVALID HDSL CABLE LENGTHS
10
9
8
7
6
5
4
3
2
VALID HDSL CABLE LENGTHS
1
0
0
1
2
3
WORKING LENGTH OF 26 GAUGE CABLE (KFT)
Figure 19. HDSL Deployment Guidelines
18
BTAP
)} (in kft)
TOTAL
BRIDGED
2.5
TAP
2.0
1.5
LENGTH
1.0
(KFT)
0.5
0.0
4
5
6
7
8
Section 61246001L2-5, Issue 2
Loop loss per Kft for other wire is summarized in
Table 6.
Recommended maximum local loop loss information
for PIC cable at 70°F, 135Ω, resistive termination is
provided in Table 7.
Table 6. HDSL Loss Values
(200 kHz cable loss in dB/Kft at 135Ω)
C
a
b
e l
C
a
b
e l
G
u
a
g
e
y T
p
e
6 2
P
C I
6 2
P
u
p l
4 2
P
C I
4 2
P
u
p l
2 2
P
C I
2 2
P
u
p l
9 1
P
C I
9 1
P
u
p l
Table 7. Loop Insertion Loss Data
F
e r
q
u
e
n
c
y
(
H
3
0 ,
0 0
0 1
0 ,
0 0
0 5
0 ,
0 0
1
0 0
0 ,
0 0
1
0 5
0 ,
0 0
2
0 0
0 ,
0 0
An approximation for the maximum amount of
wideband noise on an HDSL 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 HDSL
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
9
-7
10
BER.
e T
m
p
e
a r
u t
e r
6
° 8
9
° 0
3
9 .
2 0
4
0 .
1 5
4
0 .
0 3
4
1 .
9 7
2
8 .
3 6
2
9 .
7 5
3
1 .
9 5
3
2 .
7 5
2
1 .
8 9
2
2 .
5 5
2
4 .
3 8
. 2
5 4
1
5 .
1 5
1
5 .
7 8
1
8 .
7 1
1
8 .
6 5
) z
M
a
i x
m
u
m
L
o
s
2 1
0 .
5 1
0 .
5 2
5 .
0 3
0 .
3
. 2
5 7
3
. 5
5 2
NOTE:
61246001L2-5B
1
2
° 0
4
2 .
3 5
4
3 .
1 8
3
0 .
3 8
3
3 .
1 9
2
3 .
3 3
2
6 .
9 2
1
6 .
4 3
1
9 .
9 0
s
d (
B
)
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