61246026L6-5B
Section 61246026L6-5, Issue 2
15
Table F. HDSL Loss Values
(200 kHz cable loss in dB/kFt at 135
Ω
)
Cable
Cable
Temperature
Gauge
Type
68
°
90
°
120
°
26 .......... PIC ........ 3.902 ..... 4.051 ..... 4.253
26 .......... Pulp ....... 4.030 ..... 4.179 ..... 4.381
24 .......... PIC ........ 2.863 ..... 2.957 ..... 3.083
24 .......... Pulp ....... 3.159 ..... 3.257 ..... 3.391
22 .......... PIC ........ 2.198 ..... 2.255 ..... 2.333
22 .......... Pulp ....... 2.483 ..... 2.45 ....... 2.629
19 .......... PIC ........ 1.551 ..... 1.587 ..... 1.634
19 .......... Pulp ....... 1.817 ..... 1.856 ..... 1.909
Frequency Maximum Loss
(Hz) (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 G. Loop Insertion Loss Data
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 HDSL CABLE LENGTHS
2.0
1.5
1.0
0.5
0.0
TOTAL
BRIDGED
TAP
LENGTH
(KFT)
VALID HDSL CABLE LENGTHS
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
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 16. Loop loss per kFt for other wire
is summarized in Table F.
Figure 16. HDSL Deployment Guidelines
Recommended maximum local loop loss
information for PIC cable at 70
°
F, 135
Ω
, resistive
termination is provided in Table G.
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.
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.
