PairGain HiGain HDU-451 User manual

HIGAIN DOUBLER UNIT
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
™150-451-104-02¨
SECTION 150-451-104-02
Model List Number Part Number CLEI Code
HDU-451 4 150-1143-04 T1R5AJHEAA
L
RS 232
1
2
1
2
+
-
V
TELEPHONE CO PROPERTY
PairGain
LOOPBACK
HDU 451
HiGain DOUBLER
UNIT
HDSL IN
HDSL OUT

150-451-104-02, Revision 02
ii September 18, 1998 HDU-451 List 4
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 September 18, 1998 Reformat

150-451-104-02, Revision 02 Using This Manual
HDU-451 List 4 September 18, 1998 iii
USING THIS MANUAL
Two types of messages, identified by icons, appear in the text.
See “Abbreviations” on page 30 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 150-451-104-02, Revision 02
iv September 18, 1998 HDU-451 List 4

150-451-104-02, Revision 02 Table of Contents
HDU-451 List 4 September 18, 1998 v
TABLE OF CONTENTS
Product Overview________________________________________ 1
Description and Features.......................................................... 1
Applications ............................................................................. 2
Functional Description____________________________________ 3
Outside Enclosure Deployment Rules ..................................... 3
Front Panel............................................................................... 7
Loopback Design Description.................................................. 9
Installation ____________________________________________ 10
Inspecting Your Shipment ..................................................... 10
Installing the HDU-451 List 4 ...............................................10
Troubleshooting.....................................................................11
Isolating a Problem.................................................. 11
Solutions to Common Problems.............................. 12
Line Unit Status Menu Messages............................ 13
Monitoring the HDSL System_____________________________ 15
Connecting to the Terminal ................................................... 16
Logging On and Using the Terminal Menus .........................16
Navigating the Terminal Menus ............................................ 17
The Main Menu...................................................................... 18
View Span Status................................................................... 19
View System Settings ............................................................ 22
View Performance Data......................................................... 24
View Performance History .................................................... 25
View Alarm History............................................................... 26

Table of Contents 150-451-104-02, Revision 02
vi September 18, 1998 HDU-451 List 4
Technical Specifications __________________________________28
Pinouts_________________________________________________29
Abbreviations___________________________________________30
Product Support_________________________________________33
Technical Support...................................................................33
Warranty.................................................................................34
FCC Compliance ....................................................................35
Modifications..........................................................................35

150-451-104-02, Revision 02 List of Figures
HDU-451 List 4 September 18, 1998 vii
LIST OF FIGURES
Figure 1. HiGain Installation with Two Doublers.................................. 3
Figure 2. HDU-451 Block Diagram.......................................................4
Figure 3. The HDU-451 List 4 Front Panel............................................7
Figure 4. HiGain Loopbacks. ................................................................. 9
Figure 5. Doubler Log On Screen ........................................................ 17
Figure 6. HDU-451 Main Menu........................................................... 18
Figure 7. Span 1 Status screen.............................................................. 20
Figure 8. System Settings Screen......................................................... 22
Figure 9. Performance Data Span 1 (1 or 2 Doublers).........................24
Figure 10. Performance Data History Span 1 (1 or 2 Doublers)..........25
Figure 11. HLU Alarm History Span 1 (1 or 2 Doublers) ................... 26
Figure 12. HDU-451 List 4 Pin-Outs (active pins are black)............... 29
Figure 13. HDU-451 DB-9 Pin Outs.................................................... 30

List of Tables 150-451-104-02, Revision 02
viii September 18, 1998 HDU-451 List 4
LIST OF TABLES
Table 1. HDSL Loss over Cables ..........................................................2
Table 2. Deployment Rules for the HRE-423 and HRE-450
Enclosures .......................................................................................5
Table 3. Deployment Rules for the HRE-454 Enclosure .......................6
Table 4. The Features of the HDU-451 Front Panel ..............................8
Table 5. HLU-451 Status Menu Messages ..........................................13
Table 6. Terminal Navigational Keys ..................................................18
Table 7. Main Menu Options ...............................................................19
Table 8. Span Status Screen Fields ......................................................21
Table 9. System Settings Screen Fields ...............................................23
Table 10. Alarm History Fields ...........................................................27

150-451-104-02, Revision 02 Product Overview
HDU-451 List 4 September 18, 1998 1
PRODUCT OVERVIEW
PairGain’sHiGainModel HDU-451 List4 lowpower Doubler Unit(Figure 3
on page 7) extends the range of the HiGain repeaterless T1 transmission
system. When installed between a HiGain Line Unit (HLU) with
doubler-powering capability, and a HiGain Remote Unit (HRU), the
HDU-451 enables 1.544Mbps transmissionover an extended Carrier Serving
Area (CSA) rangeof 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 400mechanics
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 4, HiGain Doubler Unit features:
•Powered by any doubler-compatible HLU - 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 4 is identical to the List 3, except its response time to an
HDSL Span 2 or 3 HDSL loss of sync condition has been reduced to 50
milliseconds. This enables the system to switch from the main primary circuit
to the backup protect circuit when any span loses sync. The List 4 has also
been enhanced for compatibility with both the metallic sealing current of the
HRU-412,List 7 and 7A, and the simplexedsealing current of the HRU-412,
List 8 and 8A, and HRU-402 remote units.

Product Overview 150-451-104-02, Revision 02
2 September 18, 1998 HDU-451 List 4
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 2 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 theHRU. Add 3 dB for each bridged tap and 1 dB for each cable
gauge change.
The HiGain system operates with any number of other T1, POTS, Digital
Data Service (DDS) or other HiGain Systems sharing the same cable binder
group.
In orderto achieve optimum performance, the electricallength(196 kHz loss)
of all doubler spans should be as close as possible to being equal. This
arrangement usually results in the highest operating loop margins.
Use Table 1 when calculating the electrical length of each span. If it is not
possible to make all spans equal, then choose the span lengths to reduce the
total power consumption of the HLU that powers the doublers. This is done
by minimizing the length of Span 1 and maximizing the length of Span 3.
Table 1. HDSL Loss over Cables
Cable Gauge Loss @ 196 kHz(dB/kft) Ohms per kft
26/0.4mm 3.880 83.3
24/0.51mm 2.841 51.9
22/0.61mm 2.177 32.4
19/0.91mm 1.535 16.1