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11Section 61245201L1-5, Issue 361245201L1-5C
Figure 13. DSL Deployment Guidelines
6. DSL DEPLOYMENT GUIDELINES
The ADTRAN FT1 DSL system is designed to
provide Fractional 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
12 - {(3*L
26
)/9} - L
BTAP
(in kft)
L
26
= Total length of 26-AWG cable
excluding bridged taps (in kft)
L
BTAP
= Total length of all bridged taps (in kft)
This deployment criteria is summarized in the chart
shown in Figure 13.
Recommended maximum local loop loss information
for PIC cable at 70°F, 135Ω, resistive termination is
provided in Table D.
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
-7
BER.
Frequency (Hz) Maximum Loss (dB)
3,000 .......................... 12.0
10,000 .......................... 15.0
50,000 .......................... 25.5
100,000 .......................... 30.0
150,000 .......................... 32.75
200,000 .......................... 35.25
Table D. Loop Insertion Loss Data
0
12
11
10
9
8
7
6
5
4
3
2
1
0
1234
WORKING LENGTH OF 26 GAUGE CABLE (KFT)
WORKING LENGTH OF 24 GAUGE (OR COARSER) CABLE (KFT)
56789
2.5
2.0
1.5
1.0
0.5
0.0
TOTAL
BRIDGED
TAP
LENGTH
(KFT)
INVALID DSL CABLE LENGTHS
VALID DSL CABLE LENGTHS