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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
)/9} - L
26
BTAP
L
= Total length of 26-AWG cable
26
excluding bridged taps (in kft)
L
= Total length of all bridged taps (in kft)
BTAP
This deployment criteria is summarized in the chart
shown in Figure 8.
12
11
INVALID DSL CABLE LENGTHS
10
9
8
7
6
5
4
3
2
VALID DSL CABLE LENGTHS
1
0
0
1
2
3
WORKING LENGTH OF 26 GAUGE CABLE (KFT)
Figure 8. DSL Deployment Guidelines
12
(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 61180405L1-5, Issue 1
Recommended maximum local loop loss information
for PIC cable at 70°F, 135 Ω resistive termination, is
provided in Table 5.
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 a 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
Table 5. Loop Insertion Loss Data
Frequency
(Hz)
3000 .................................... 12.0
10,000 .................................... 15.0
50,000 .................................... 25.5
100,000 .................................... 30.0
150,000 .................................... 32.75
200,000 .................................... 35.25
7. MAINTENANCE
The ADTRAN FT1 DP does not require routine
maintenance for normal operation. In case of
equipment malfunction, use the features supplied with
the FT1 DP to help locate the source of the problem.
ADTRAN does not recommend that repairs be
performed in the field. Repair services may be
obtained by returning the defective unit to ADTRAN
Customer and Product Support (CAPS).
9
NOTE
-7
BER.
Maximum Loss
(dB)
61180405L1-5A
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