13
Section 61245001L7-5, Issue 1
61245.001L7-5A
Figure 15. HDSL Deployment Guidelines
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
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 15.
Loop loss per kft for other wire is summarized in Table E.
Table E. 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
___________________________________________
Recommended maximum local loop loss information for
PIC cable at 70
°
F, 135
Ω
, resistive termination is provided
in Table F.
Table F. Loop Insertion Loss Data
________________________________
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
________________________________
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 10
-7
BER.
7.
TROUBLESHOOTING PROCEDURES
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
