ADTRAN FT1 User Manual
Page 5
Section 61245211L1-5, Issue 1
61245211L1-5A
5
Table C. Loop Insertion Loss Data
Frequency
Maximum Loss
(Hz)
(dB)
3000 ...................... 12.0
10,000 ...................... 15.0
50,000 ...................... 25.5
100,000 ...................... 30.0
150,000 ...................... 32.75
200,000 ...................... 35.25
5. CSA DEPLOYMENT GUIDELINES
The ADTRAN FT1 DSL system including the
ADTRAN Single-Wide FT1 Repeater 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 4.
Recommended maximum local loop loss
information for PIC cable at 70
°
F, 135
Ω
, resistive
termination is provided in Table C.
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.
NOTE
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.
Figure 4. CSA Deployment Guidelines
0
12
11
10
9
8
7
6
5
4
3
2
1
0
1
2
3
4
WORKING LENGTH OF 26 GAUGE CABLE (KFT)
WORKING LENGTH OF 24 GAUGE (OR COARSER) CABLE (KFT)
5
6
7
8
9
2.5
INVALID CSA CABLE LENGTHS
2.0
1.5
1.0
0.5
0.0
TOTAL
BRIDGED
TAP
LENGTH
(KFT)
VALID CSA CABLE LENGTHS