Unit installation

61223026L2-5A Issue 1, November 2003 21
7. 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:
• All loops are nonloaded only.
• For loops with 26-AWG cable, the maximum loop
length including bridged tap lengths is 9 kft.
• For loops with 24-AWG cable, the maximum loop
length including bridged tap lengths is 12 kft.
• Any single bridged tap is limited to 2 kft.
• Total bridged tap length is limited to 2.5 kft.
• 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 27.
Figure 27. HDSL2 Deployment Guidelines
Loop loss per kilofoot for other wire is summarized in
Tab le 8.
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)
56789
2.5
2.0
1.5
1.0
0.5
0.0
TOTAL
BRIDGED
TAP
LENGTH
(KFT)
VALID CABLE LENGTHS
INVALID CABLE LENGTHS
Table 8. HDSL2 Loss Values
Cable
Gauge
Cable
Type
Temperature (°F)
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 2.545 2.629
19 PIC 1.551 1.587 1.634
19 Pulp 1.817 1.856 1.909