8
61221002L2-5B
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
2.0
1.5
1.0
0.5
0.0
TOTAL
BRIDGED
TAP
LENGTH
(KFT)
VALID CABLE LENGTHS
INVALID CABLE LENGTHS
Figure 4. Deployment Guidelines
Table 9
lists the ADTRAN Litespan H2TU-C and
H2TU-R factors needed to calculate channel bank
power using Worksheet PW-1.
The Table 9 power factors are derived from the power
parameters listed in
Table 10
.
4. 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 - 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.)
7. Recommended loop resistance for circuit
deployment is
≤
750
Ω
(9 kft. of 26
AWG)
.
This deployment criteria is summarized in the chart
shown in
Figure 4
.
Power Bus
+5 V
-48 V Switch battery
Power consumption
Power dissipation
ADTRAN Litespan H2TU-C
and AH2TU-R
324 mA
125 mA
6 W
3 W
Table 10. Power Parameters
n
o
i
t
a
r
u
g
i
f
n
o
C
r
o
t
c
a
F
n
m
u
l
o
C
A
r
o
t
c
a
F
n
m
u
l
o
C
B
r
o
t
c
a
F
n
m
u
l
o
C
C
r
o
t
c
a
F
n
m
u
l
o
C
D
R
-
U
T
2
H
n
a
p
s
e
t
i
L
N
A
R
T
D
A
4
2
3
.
0
A
N
A
N
5
2
1
.
0
Table 9. Worksheet PW-1 Factors
