6
Section 61179512L2-5, Issue 1
61179512L2-5A
4. TESTING
The ADTRAN HDSL system provides the ability to
monitor the status and performance of the DSX-1
signals, DS1 signals, and HDSL loop signals.
Detailed performance monitoring is provided by the
faceplate mounted RS-232 Control port of the 3192.
These features are valuable in troubleshooting and
isolating any system level problems that may occur at
installation or during operation of the HDSL system.
The following subsections describe additional testing
features.
Bantam Jacks
The faceplate of the HTU-C contains metallic splitting
bantam jacks for access to DSX-1 TX and RX from
the local loop. This permits intrusive testing of the
DSX-1 traffic on the HDSL loops.
Figure 7
illustrates the complete bantam jack
arrangement and details for specific jacks.
Loopbacks
The ICOT responds to two different loopback
activation processes. First, loopbacks may be
activated using the VT100 terminal Screens.
Second, the ICOT responds to the industry defacto
standard for HDSL loopbacks. A detailed description
of these loopback sequences is given in
Appendix A
.
The loopback condition imposed in all cases is a logic
level loopback at the point within the ICOT where the
DSX-1 signal passes into the HDSL modulators.
Figure 8
depicts all of the loopback locations possible
with ADTRAN HDSL equipment.
Figure 8. Loopback Configurations
Figure 7. Bantam Jack Arrangement
DSX-1
MON
RX
ICOT
DATA
PUMP
LOOP DC
POWER SOURCE
DSX-1
T1
R1
DSX-1
T
R
HDSL
LOOP 1
HDSL
LOOP 2
ICOT
HDSL
LOOP 1
HDSL
LOOP 2
EQ
RX
DSX-1
MON
TX
EQ
TX
5. DEPLOYMENT GUIDELINES
The ADTRAN ICOT 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 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
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 in
Figure 9
.
DSX-1
ICOT
LOCAL
LOOP
HLIU Network-Side Loopback or
HLIU NIU Loopback
HLIU
X
DS1
X = Signal Inactive
X
