PairGain HiGain HDU-451 User manual

HIGAIN DOUBLER UNIT
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
™150-451-142-03G¨
SECTION 150-451-142-04
Model List Number Part Number CLEI Code
HDU-451 4B 150-1143-42 T1R5A5HEAA
LISS1
RS 232
1
2
1
2
+
-
V
TELEPHONE CO PROPERTY
PairGain
LOOPBACK
HDU 451
HiGain DOUBLER
UNIT
HDSL IN
HDSL OUT

150-451-142-04, Revision 04
ii October 8, 1998 HDU-451 List 4B
Revision History of This Practice
©Copyright 1998 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc.
Information contained in thisdocumentis companyprivate toPairGain Technologies, Inc.,
and shall notbe modified, used, copied, reproduced or disclosedin whole orin part without
the written consent of PairGain.
Other product names mentioned in this practice are used for identification purposes only
and may be trademarks or registered trademarks of their respective companies.
Revision Release Date Revisions Made
01 October 3, 1997 Initial release
02 November 11, 1997 Minor modifications
03 September 15, 1998 Reformat
04 October 8, 1998 Modify cover information

150-451-142-04, Revision 04 Using This Manual
HDU-451 List 4B October 8, 1998 iii
USING THIS MANUAL
Two types of messages, identified by icons, appear in the text.
See “Abbreviations” on page 32 for a list of abbreviations used throughout
this technical practice.
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or the
possibility of personal injury.

Using This Manual 150-451-142-04, Revision 04
iv October 8, 1998 HDU-451 List 4B

150-451-142-04, Revision 04 Table of Contents
HDU-451 List 4B October 8, 1998 v
TABLE OF CONTENTS
Product Overview________________________________________ 1
Description and Features.......................................................... 1
Applications ............................................................................. 2
Functional Description____________________________________ 4
Outside Enclosure Deployment Rules ..................................... 4
Front Panel............................................................................... 8
Loopback Design Description................................................ 10
Installation ____________________________________________ 11
Inspecting Your Shipment ..................................................... 11
Installing the HDU-451 List 4B............................................. 11
Troubleshooting.....................................................................12
Isolating a Problem.................................................. 12
Solutions to Common Problems.............................. 13
Line Unit Status Menu Messages............................ 14
Monitoring the HDSL System_____________________________ 16
Connecting to the Terminal ................................................... 17
Logging On and Using the Terminal Menus .........................17
Navigating the Terminal Menus ............................................ 18
The Main Menu...................................................................... 19
View Span Status................................................................... 21
View System Settings ............................................................ 23
View Performance Data......................................................... 26
View Performance History .................................................... 27
View Alarm History............................................................... 28

Table of Contents 150-451-142-04, Revision 04
vi October 8, 1998 HDU-451 List 4B
Technical Specifications __________________________________30
Pinouts_________________________________________________31
Abbreviations___________________________________________32
Product Support_________________________________________35
Technical Support...................................................................35
Warranty.................................................................................36
FCC Compliance ....................................................................37
Modifications..........................................................................37

150-451-142-04, Revision 04 List of Figures
HDU-451 List 4B October 8, 1998 vii
LIST OF FIGURES
Figure 1. HiGain Installation with Two Doublers.................................. 3
Figure 2. HDU-451 Block Diagram.......................................................5
Figure 3. The HDU-451 List 4B Front Panel......................................... 8
Figure 4. HiGain Loopbacks. ............................................................... 10
Figure 5. Doubler Log On Screen ........................................................ 18
Figure 6. HDU-451 Main Menu........................................................... 19
Figure 7. Span 1 Status screen.............................................................. 21
Figure 8. System Settings Screen......................................................... 24
Figure 9. Performance Data Span 1 (1 or 2 Doublers).........................26
Figure 10. Performance Data History Span 1 (1 or 2 Doublers)..........27
Figure 11. HLU Alarm History Span 1 (1 or 2 Doublers) ................... 28
Figure 12. HDU-451 List 4B Pin-Outs (active pins are black)............ 31
Figure 13. HDU-451 DB-9 Pin Outs.................................................... 32

List of Tables 150-451-142-04, Revision 04
viii October 8, 1998 HDU-451 List 4B
LIST OF TABLES
Table 1. HDSL Loss Over Cables .........................................................3
Table 2. Deployment Rules for the HRE-423 and HRE-450
Enclosures .......................................................................................6
Table 3. Deployment Rules for the HRE-454 Enclosure .......................7
Table 4. The Features of the HDU-451 Front Panel ..............................9
Table 5. HLU-451 Status Menu Messages ..........................................14
Table 6. Terminal Navigational Keys ..................................................19
Table 7. Main Menu Options ...............................................................20
Table 8. Span Status Screen Fields ......................................................22
Table 9. System Settings Screen Fields ...............................................24
Table 10. Alarm History Fields ...........................................................29

150-451-142-04, Revision 04 Product Overview
HDU-451 List 4B October 8, 1998 1
PRODUCT OVERVIEW
PairGain’s HiGain Model HDU-451 List 4B low power Doubler Unit
(Figure 3 on page 8) extends the range of the HiGain repeaterless T1
transmission system. When installed between a HiGain Line Unit with
doubler-powering capability, and an HRU-412 HiGain Remote Unit, the
HDU-451 enables 1.544Mbps transmissionover an extended Carrier Serving
Area (CSA) range of approximately 24,000 feet of 24 AWG or 18,000 feet of
26 AWG wire. Customers can use two doublers in series to triple the normal
CSA range (36,000 feet on 24 AWG).
The HDU-451mounts in a single slot ofany industry standard 400 mechanics
shelf or in equivalentenclosures manufactured byPairGainTechnologies.All
HiGain modules comply with the applicable requirements of
TR-TSY-000063 (Network Equipment Building System (NEBS) Generic
Equipment requirements) and TR-TSY-000499 (Transport System Generic
Requirements - TSGR).
DESCRIPTION AND FEATURES
HDU-451 List 4B, HiGain Doubler Unit features:
•Powered by the HLU List 6D - no local power required
•Front Panel HDSL Status Display
•Front panel jacks for test access
•Lightning and power cross protection on the HDSL interfaces (both
sides)
•Front Panel Doubler loopback LED indicator
•Low power dissipation
The HDU-451 List 4B unit is compatible with any HiGain Line Unit that
supports doublers.
The HDU-451 List 4B is identical to the List 3B, except that it is compatible
with bothmetallicsealing currents and thesimplexedsealingcurrentsthatare
found in HiGain remote units.

Product Overview 150-451-142-04, Revision 04
2 October 8, 1998 HDU-451 List 4B
In line with PairGain's continuing efforts to provide equipment that fully
complies with new industrystandards, the List 4Bdoubler hasbeen enhanced
with a special ground fault-detecting circuit described in Paragraph R7-1,
Section 7.2.1 of GR-1089-CORE, Issue 1, Revision 1, December, 1996.
When used with HiGain line units, ground faults occurring at any point along
anyspan on any wire areimmediately detected. This condition shuts down the
HiGain circuit. The line unit will periodically try to apply power to the first
span to determine whether the fault condition is still present. As long as the
fault condition exists, the power cycling and ground fault protection
continues.
Circuits containing both the new List B and older doublers also support this
new ground fault detecting feature, provided the doubler nearest the HLU is
a List B unit. The presence of this new circuit causes the HDSL
span-powering voltage levels to beshifted up to 100 volts more positive than
what they are in non-List B doubler circuits. The actual shift depends on loop
length, number of doublers, HRU powering option, and the setting of the
HLUBipolar/UnipolarSwitch.TheList Bdoublersarebackward-compatible
with all versions of HiGain line units.
APPLICATIONS
The primary application of the HDU-451 HiGain Doubler is to extend the
delivery of T1 High Capacity Digital Service (HCDS) to customers over
metallic cable pairs, up to 24,000 or 36,000 feet (24 AWG). A doubler
application is shown in Figure 1 on page 3. A maximum of two HDU-451
units can be used in tandem on the same circuit.
Table 1 on page 3 provides a guide for the loss of various cable gauges at
196 kHz and 135 ohms. The table applies to the HDSL cable pairs between
the HLU and the HDU-451 as well as between the HDU-451 and a second
HDU-451 or the HRU-412. Add 3 dB for each bridged tap and 1 dB for each
cable gauge change.
The operation of the ground fault circuit requires that the
doubler enclosure be connected to earth ground.