PairGain HIGAIN HRU-412 User manual

HIGAIN REMOTE UNIT
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
™150-412-108-02B¨
SECTION 150-412-108-02
Model List Number Part Number CLEI Code
HRU-412 8 150-1103-08 T1L2CC0AAA

150-412-108-02, Revision 02
ii July 13, 1998 HRU-412 List 8
Revision History of This Practice
©Copyright 1998 PairGain Technologies, Inc.
PairGain, and HiGain are registered trademarks of PairGain Technologies, Inc.
Information containedin thisdocumentis company private to PairGain Technologies,Inc.,
and shall not be modified, used, copied, reproduced or disclosed in whole or in 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
02 July 13, 1998 Modified and Updated
01 March 22, 1996 Initial Release

150-412-108-02, Revision 02 Using This Technical Practice
HRU-412 List 8 July 13, 1998 iii
USING THIS TECHNICAL PRACTICE
Two types of messages, identified by icons, may appear in the text.
ABBREVIATIONS
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or the
possibility of personal injury.
AMI Alternate Mark Inversion
BER Bit Error Rate
BPV Bipolar Violations
B8ZS Binary Eight Zero Substitution
CO Central Office
CRC Cyclic Redundancy Check
CSA Carrier Service Area
ES Errored Seconds
ESF Extended Superframe
HDSL High-bit-rate Digital Subscriber Line
HLU HiGain Line Unit
HRU HiGain Remote Unit

Abbreviations 150-412-108-02, Revision 02
iv July 13, 1998 HRU-412 List 8
SF Super Frame
SNR Signal-to-Noise Ratio
SPLB Special Loopback
ZBTSI Zero Byte Time Slot Interface

150-412-108-02, Revision 02 Table of Contents
HRU-412 List 8 July 13, 1998 v
TABLE OF CONTENTS
Overview _______________________________________________ 1
Applications ____________________________________________ 2
Specifications ___________________________________________ 3
Functional Description____________________________________ 5
Operational Capabilities........................................................... 5
Front Panel Features ................................................................ 7
Rear Panel Features................................................................ 10
Local and Line Powering....................................................... 12
Installation ____________________________________________ 14
Unpack and Inspect the Shipment.......................................... 14
Install the HRU-412 List 8..................................................... 14
Installation Test...................................................................... 16
Provision and Monitor Performance _______________________ 18
Connect an ASCII Terminal .................................................. 18
Log On and Use the Menus ................................................... 19
View Span Status..................................................... 22
Set Clock ................................................................. 24
System Settings ....................................................... 25
View Performance Data .......................................... 26
View 7 Day History................................................. 27
View Alarm History................................................28
Loopbacks _____________________________________________ 30

Table of Contents 150-412-108-02, Revision 02
vi July 13, 1998 HRU-412 List 8
Product Support_________________________________________33
Technical Support...................................................................33
Warranty.................................................................................34
FCC Compliance....................................................................35
Modifications..........................................................................35
UL Listing ..............................................................................35
CSA Certification...................................................................36

150-412-108-02, Revision 02 List of Figures
HRU-412 List 8 July 13, 1998 vii
LIST OF FIGURES
1. HRU-412 List 8 Block Diagram ........................................................6
2. HRU-412 List 8 Front Panel ..............................................................7
3. HRU-412 List 8 Rear Panel.............................................................. 10
4. HRU-412 List 8 Pinouts................................................................... 15
5. HRU-412 List 8 Craft Port Wiring...................................................18
6. Remote Logon Screen...................................................................... 20
7. Main Menu, Local Log On............................................................... 21
8. Span Status Screen, No Doublers in Use ......................................... 22
9. Span 1 Status Screen, Doublers in Use ............................................ 23
10. Set Clock Screen ............................................................................ 24
11. System Settings Menu.................................................................... 25
12. Performance Data Screen............................................................... 26
13. 7 Day History Screen ..................................................................... 27
14. Alarm History Screen..................................................................... 28
15. HRU-412 List 8 Loopbacks ........................................................... 30

List of Tables 150-412-108-02, Revision 02
viii July 13, 1998 HRU-412 List 8
LIST OF TABLES
1. HDSL Loss Over Cables.....................................................................3
2. HRU-412 List 8 Front Panel Components..........................................8
3. Rear Panel Components....................................................................11
4. HRU-412 List 8 Alarm History Screen Definitions .........................29

150-412-108-02, Revision 02 Overview
HRU-412 List 8 July 13, 1998 1
OVERVIEW
The PairGain®HiGain®Remote Unit Model HRU-412 List 8 is the remote
end of a repeaterless T1 transmission system. An HRU-412 List 8 connects
to a HiGain Line Unit (HLU), creating a HiGain system which provides 1.544
Mbps transmission on two unconditioned copper pairs over the full Carrier
Service Area (CSA) range. The CSAencompasses approximately 12,000 feet
of AWG 24 wire or 9,000 feet of AWG 26 wire, including bridge taps and
gauge changes. A HiGain system utilizes 2B1Q High-bit-rate Digital
Subscriber Line (HDSL) transmission technology. The HRU-412 List 8
complies with ANSI T1E1.4, T1.403-1989, and T1E1.4/92-002R2 technical
standards and recommendations. The HRU-412 List 8 mounts in a single slot
of an industry standard 400 Mechanics type shelf. The system also complies
with GR-63 Core of Network Equipment Building System (NEBS) Generic
Equipment requirements, and Transport System Generic Requirements
(TSGR) common requirements TR-TSY-000499.
The HRU-412 List 8 features:
•Customer Interface (CI)
•Front panel DS1 and HDSL LEDs
•Front panel loopback button
•Signature resistance on DS1 and HDSL ports
•Generic and addressable repeater loopback activation codes
•Metallic SmartJack loopback (conforms to TR-TSY-000312)
•Provisioning switches for customer premise equipment (CPE) current,
receive (RCV) level, and transmit loss of signal (TLOS) initiated
loopback or alarm
•Line or local power options
•Sealing current
•Front panel jacks for test access
•Craft port
•CPE current monitor test points
•Front panel HDSL margin threshold indicator for each loop
•Lightning and power cross protection on HDSL and DS1 interfaces

Applications 150-412-108-02, Revision 02
2 July 13, 1998 HRU-412 List 8
•784kbps full-duplex 2B1Q HDSL transmission on two pairs
•DS0 blocking support
The HRU-412 List 8 supports PairGain’s 1 x 1 Protection Switching System.
The HRU-412 List 8 can be line powered or locally powered and has a
simplexed sealing current option. The HDSL line input resistive signature is
14 Ω.
APPLICATIONS
A HiGain system, consisting of a HiGain line unit and a HiGain remote unit,
provides a quick and cost-effective way of delivering T1 High Capacity
Digital Service (HCDS) to customers over copper pairs. The HiGain system
can be deployed on two unconditioned, non-loaded copper pairs without
repeaters, and without the need for bridged tap removal or binder group
separation.
The generalguidelines for HiGain system usage isthat each loop has less than
35 dB of loss at 196 kHz, with 135 Ωdriving and terminating impedances.
Table 1 provides a guide for the loss over various cable gauges at 196 kHz
and135Ω.The tableappliestothe HDSL cable pairs between theHiGain line
unitand theHiGainremoteunit.Without specific loop insertion lossdata, add
3 dB for each bridged tap and 1 dB for each cable gauge change.
The dc cable resistance determines the simplex powering resistance path of
the loops. The maximum allowable resistance for a HiGain system is 800 Ω
over two HDSL simplex loops. This means, for example, where 12 kft AWG
24 equals 34.08 dB (insertion loss) resistance is at 622 Ω, which is well below
the limit of 800 Ω.
The HRU-412 List 8 supports PairGain’s 1 x 1 Protection
Switching System.