ADTRAN HTU-C M Switch User Manual


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2 Section 61245001L2-13, Issue 1 61245.001L2-13A
ADTRAN PRACTICES 5
th
Gen HTU-C/HTU-R Quick Start guide
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 9kft.
3. For loops with 24-AWG cable, the maximum
loop length including bridged tap lengths is
12kft.
4. Any single bridged tap is limited to 2kft.
5. Total bridged tap length is limited to 2.5kft.
6. The total lenght of multi-gauge cable containing
26-AWG cable must not exceed:
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.
Recommended maximum local loop loss information for
PIC cable at 70°F, 135Ω, resistive termination is listed in
the provided table.
An approximation for maximum amount of wideband
nosie on a DSL local loop as measured by a 50kbps filter
is < 31dBrn.
An approximation for maximum amount of impulse noise
on a DSL local loop as measured by a 50kbps filter is < 50dBrn.
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.
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
INVALID HDSL CABLE LENGTHS
2.0
1.5
1.0
0.5
0.0
TOTAL
BRIDGED
TAP
LENGTH
(KFT)
VALID HDSL CABLE LENGTHS
Loop Insertion Loss
)zH(ycneuqerF)Bd(ssoLmumixaM
0003
000,01
000,05
000,001
000,051
000,002
0.21
0.51
5.52
0.03
57.23
52.53
ADTRAN Technical Support (800) 726-8663
Standard support hours, Monday-Friday, 7am-7pm CST
Emergency Support 7 days/week, 24 hours/day
When deployment requires the use of two HREs, the
HTU-C M can be deployed with two Low Voltage T400
HREs (1244.041L2) and one Low Voltage HTU-R
(1245.021L1 or 1245.026L1).
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