ADTRAN 239 T1 Instruction Manual

Adirati
239 T1 HDSL4 Repeater (H4R)
Installation and Maintenance Practice
Part Number - 61223445L1-5D
CLEI: T1R6U87D_
October 2004

239 H4R Installation s
Trademarks
Any brand names and product names included in this manual are trademarks, registered trade¬
marks, or trade names of their respective holders.
To the Holder of the Manual
The contents of this publication are current as of the date of publication. ADTRAN reserves the
right to change the contents without prior notice.
In no event will ADTRAN be liable for any special, incidental, or consequential damages or for
commercial losses even if ADTRAN has been advised thereof as a result of issue of this publi-
Adirati
P.O. Box 140000
Huntsville, AL 35814-4000
[phone]
©2004 ADTRAN, Inc.
All Rights Reserved.
Printed in U.S.A.
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Revision History
Description of Changes
Updated to add Bad Splice Det
Conventions
The following typographical conventions are used in this document:
This font indicates a cross-reference link. First-time references to tables and figures a
this font.
This font indicates screen menus, fields, and parameters.
This FONT indicates keyboard keys (ENTER, Esc, ALT). Keys that are to be pressed sir
are shown with a plus sign (Alt+X indicates that the ALT key and X key should be pre
This font indicates on-screen messages and prompts.
This font indicates silkscreen labels or other system label items.
This font is used for strong emphasis
eously
tthe
NOTE
Notes inform the user of additional but essential information or features.
CAUTION
Cautions inform the user of potential damage, malfunction, or disruption to equip¬
ment, software, or environment.
WARNING
Warnings inform the user of potential bodily pain, injury, or death.
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Training
239 H4R Installation and Maintenance Practice
ADTRAN offers training courses on our products. These courses include overviews on product
features and functions while covering applications of ADTRAN’s product lines. ADTRAN
provides a variety of training options, including customized training and course taught at our facil-
Training Phone:
Training Fax:
Training Email:
800-615-1176, ext. 7500
256-963-6700
[email protected]
61223445L1-5D

Contents
General.1
Description.1
Features.2
Bad Splice Detection Feature .2
View Splice Results Screen .2
Fast Retrain Feature.3
Compatibility .4
Compliance.4
Shipping Contents.5
Connections.6
HDSL4 Deployment Guidelines.6
H4R Capacity Guidelines.7
Front Panel LEDs.9
Maintenance.10
Specifications.10
Appendix A
Warranty.. .
Warranty and Customer Service
ADTRAN Sales .
ADTRAN Technical Support .
ADTRAN Repair/CAPS .
Repair and Return Address . .
Figures
Tables
Table 1. ADTRAN Unit Compatibility 4
Table 2 Compliance Codes.4
Table 3- H4R Card Edge Pin Assignments.6
Table 4. 239 H4R Capacity Guidelines for ADTRAN Housings.7
Table 5. 239 H4R Capacity Guidelines for Other Housings.8
Table 6 Front Panel LEDs.9
Table 7. 239 T1 HDSL4 Repeater (H4R) Specifications.11
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239 H4R Installation ar
This page i
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239 T1 HDSL4 Repeater (H4R)
1. GENERAL
This practice is an installation and maintenance guide for the ADTRAN® 239 T1 HDSL4 Repeater (H4R) (239
H4R). Figure 1 illustrates the 239 H4R (P/N 1223445L1) front panel.
2. DESCRIPTION
HDSL4 provides extended range T1 (DS1) transport on the telecommunications network. HDSL4 features spectral
compatibility with ADSL and other transport technologies.
This 239 H4R performs signal regeneration to extend the range of the HDSL4 circuit.
The H4TU-C (Central Office Transceiver) unit receives DSX-1 input signals from the network through the chassis,
transports them across the HDSL4 circuit, and terminates them through an H4TU-R remote unit which provides a
traditional DS1 to customer equipment. The H4TU-C provides testing, provisioning, and performance monitoring
capabilities that address circuit status.
The H4TU-C works in conjunction with the ADTRAN H4TU-R (Remote) and up to three H4Rs (Repeaters) to
provide a DS 1 service on the local loop.
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TC PAM line coding
Lightning protection
NOTE
ed by ADTRAN algoritLis.
7

239 H4R Ir
to that anomaly. This number will also reflect the highest anomaly count seen, as it is possible to have more than
one bad splice per circuit. This screen will report the worst (most frequently detected) anomaly.
In this example, a detection has occurred approximately 650 feet from an H4TU-C module on Loop 2 of the
HDSL4 circuit.
Figure 2. Splice Results Screen
Fast Retrain Feature
Fast Retrain is an ADTRAN proprietary feature whose intent is to minimize downtime when an intermittent non
power-related impairment (bad splice, noise burst, etc.) affects the HDSL loop and cannot be bridged.
HDSL2 and HDSL4 transceivers normally train in approximately 25 to 30 seconds. For an initial circuit turn-up,
this is not a big issue. However, once service has been established on the circuit, any large down-time will interrupt
communications on the circuit. A loss of synchronization on the F1DSL loop can cause excessive down times due
not only to the 30-second HDSL retrain time, hut also further delays due to the higher level protocols in the
network going through re-synchronization. On the older generation 1TDSL2 and F1DSL4 units, a 1-second loss of
HDSL frame synchronization would cause the data pumps to retrain. This retrain would take approximately 25
seconds during which AIS would be sent to the terminating equipment. The reception of AIS by the terminating
equipment then might trigger higher level protocol re-synchronizations.
In an effort to minimize this down time, the Fast Retrain feature has been implemented. If an impairment (bad
splice, for example) causes the F1DSL data pump to lose frame synchronization for 500 msec or longer, instead of
retraining, a fast retrain will be attempted. This abbreviated train can achieve data mode in 5 to 7 seconds. A
(UAS) in the PM data for each LOS alarm recorded.
NOTE
Fast-Retrain capable units must be installed on both ends of the HDSL4 circuit for
for any reason, then th/traditional (25-30 second) retrain will be initiated. P
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239 H4R Installation and It
Compatibility
The 239 H4R is used in conjunction with any T1.418 compliant span powering H4TU-C and H4TU-R. Compatible
ADTRAN HDSL4 transceiver units are listed in Table 1.
Table 1. ADTRAN Unit Compatibility
Part Number
11814bcLy
122x401L y
122x403L y
122x404Ly
122x407L y
122x424Ly
\22x426Ly
Unit Name
Total Access 3000 H4TU-C
220 H4TU-C
DDM+ H4TU-C
3192 H4TU-C
Soneplex H4TU-C
T200 H4TU-R, Local Power
T200 H4TU-R, Span Power
Due to span power limits, the number of H4Rs permitted in the circuit depends upon the type of H4TU-C utilized.
An ADTRAN 239 H4R provides DS1 transport on all revised resistance design (RRD) 26 AWG and/or 24 AWG
loops. Three ADTRAN 239 H4R repeaters may be added to extend the range of a loop.
Repeater placement is determined by the following criteria:
• On single H4R loops, only on the attenuation properties of the loop segment must be considered.
• For a circuit requiring two H4Rs, both segment attenuation as well as segment DC resistance requirements be
satisfied.
• For a circuit requiring three H4Rs, H4TU-C and H4TU-R hardware requirements, segment attenuation, and
Refer to the “HDSL4 Deployment Guidelines” on page 6 of this practice and the Installation and Maintenance
Practice for the deployed H4TU-C.
Compliance
Table 2 shows tbe compliance codes for the 239 H4R. The 239 H4R is NRTL listed to the applicable UL standards.
The 239 H4R is to be installed in a restricted access location and in a Type “B” or “E” enclosure only.
Table 2. Compliance Codes
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