Hdsl2 Deployment Guidelines; Figure 21. Deployment Guidelines; Table 7. Hdsl2 Loss Values; Table 8. Loop Insertion Loss Data - ADTRAN DDM+ H2TU-C Installation And Maintenance Manual

7. HDSL2 DEPLOYMENT GUIDELINES

The ADTRAN HDSL2 system provides DS1-based
services over loops designed to comply with the
Carrier Service Area (CSA) guidelines 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 )/(9-L
26
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 Figure 21.
12
11
INVALID CABLE LENGTHS
10
9
8
7
6
5
4
3
2
VALID CABLE LENGTHS
1
0
0 1 2 3
WORKING LENGTH OF 26 GAUGE CABLE (KFT)

Figure 21. Deployment Guidelines

For more information regarding deployment
guidelines and applications, reference ADTRAN's
Supplement Deployment Information for HDSL/
HDSL2 document, P/N 61221HDSLL1-10.
18
)} (in kft)
BTAP
TOTAL
2.5 BRIDGED
2.0 TAP
1.5 LENGTH
1.0
(KFT)
0.5
0.0
4 5 6 7 8
61222003L1-5, Issue 1
Loop loss per kft for other wire is summarized in
Table 7.

Table 7. HDSL2 Loss Values

(200 kHz cable loss in dB/kft at 135 Ω)
Cable Cable
Gauge Type
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 8.

Table 8. Loop Insertion Loss Data

Frequency (Hz)
3,000 .............................................. 12.00
10,000 .............................................. 15.00
50,000 .............................................. 25.50
100,000 .............................................. 30.00
150,000 .............................................. 32.75
196,000 .............................................. 35.00
200,000 .............................................. 35.25
250,000 .............................................. 37.50
325,000 .............................................. 42.00
An approximation for the maximum amount of
wideband noise on an HDSL2 local loop as measured
by a 50 kb filter is ≤ 31 dBrn.
An approximation for the maximum level of impulse
noise as measured using a 50 kb filter on an HDSL2
loop is ≤ 50 dBrn.
9
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
Temperature
° °
68 90 120
Maximum Loss (dB)
NOTE
-7 BER.
61222003L1-5A
°