Product specifications
61223006L1-5C Issue 3, December 2003 23
6. HDSL2 DEPLOYMENT GUIDELINES
The ADTRAN HDSL2 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 nonloaded 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 multigauge cable containing
26-AWG cable must not exceed the following:
• 12 - {(3*L
26) / (9- LBTAP)} (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)
These deployment criteria are summarized in the chart
shown in Figure 32.
Figure 32. HDSL2 Deployment Guidelines
Loop loss per kilofoot for standard wire gauges is
summarized in Tabl e 6.
NOTE
These approximations are to be used as guide-
lines only and may vary slightly on different
loops. Adhering to the guidelines should
produce performance in excess of 10
-7
BER.
An approximation for the maximum amount of
wideband noise as measured using an F filter on an
HDSL2 loop having 35 dB loss is < –47 dBrnF.
An approximation for the maximum level of impulse
noise as measured using an F filter on an HDSL2 loop
having 35 dB loss is
≤–38 dBrnF.
For additional information on these and other
deployment issues, refer to HDSL Supplemental
Deployment Information, document number
61221HDSLL1-10.
NOTE
These approximations are to be used as guide-
lines only and may vary slightly on different
loops. Adhering to the guidelines should
produce performance in excess of 10
-7
BER.
0
12
11
10
9
8
7
6
5
4
3
2
1
0
1234
WORKING LENGTH OF 26 GAUGE CABLE (KFT)
WORKING LENGTH OF 24 GAUGE (OR COARSER) CABLE (KFT)
5678
9
2.5
INVALID CABLE LENGTHS
1.5
1.0
0.5
TOTAL
BRIDGED
TAP
LENGTH
(KFT)
VALID CABLE LENGTHS
2.0
0.0
Table 6. HDSL2 Loss Values
Cable
Gauge
Cable
Type
Temperature
68°F 90°F 120°F
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 2.545 2.629
19 PIC 1.551 1.587 1.634
19 Pulp 1.817 1.856 1.909