PairGain HIGAIN HRU-412 User manual

HIGAIN REMOTE UNIT
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
SECTION 150-412-171-04
Model List Number Part Number CLEI Code
HRU-412 7A 150-1103-71 T1L2CL0A

150-412-171-04, Revision 04
ii November 23, 1999 HRU-412 List 7A
Revision History of This Practice
©Copyright 1999 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc. Other
product namesmentionedin this practice are usedfor identification purposes onlyandmay
be trademarks or registered trademarks of their respective companies.
Information containedin this documentis 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.
Information furnished by PairGain Technologies is believed to be accurate and reliable.
However, no responsibility is assumed by PairGain Technologies for its use; nor for any
infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of PairGain
Technologies. PairGain Technologies reserves the right to change specifications at any
time without notice.
Revision Release Date Revisions Made
01 September 18, 1997 Initial release
02 September 18, 1998 Reformat
03 February 19, 1999 Update local and line powering
04 November 23, 1999 Correct line powering specifications

150-412-171-04, Revision 04 Using This Technical Practice
HRU-412 List 7A November 23, 1999 iii
USING THIS TECHNICAL PRACTICE
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DOCUMENTATION
If you have comments on this PairGain document, send an email to
[e-mail]. Type the product name and the
section number of the document in the subject area of the email message.
INSPECTING THE SHIPMENT
Upon receipt of the equipment:
•Unpack each container and visually inspect the contents for signs of
damage. If the equipment has been damaged in transit, immediately
report the extent of damage to the transportation company and to
PairGain. Order replacement equipment, if necessary.
•Check the packing list to ensure complete and accurate shipment of each
listed item. If the shipment is short or irregular, contact PairGain as
describedin theWarrantylocatedinsidethebackcover.Ifyou muststore
the equipment for a prolonged period, store the equipment in its original
container.
Notes contain information about special circumstances.
Caution symbols indicate the possibility of equipment
damage or the possibility of personal injury.
The Electrostatic Discharge (ESD) Susceptibility symbol
indicates that a device or assembly is susceptible to damage
from electrostatic discharge.

Inspecting the Shipment 150-412-171-04, Revision 04
iv November 23, 1999 HRU-412 List 7A

150-412-171-04, Revision 04 Table of Contents
HRU-412 List 7A November 23, 1999 v
TABLE OF CONTENTS
Overview _______________________________________________ 1
Applications ____________________________________________ 2
Front and Rear Panel_____________________________________ 3
Installation _____________________________________________ 9
Install the HRU-412 List 7A....................................................9
Installation Test...................................................................... 10
Remote Login __________________________________________ 11
Connecting to a Maintenance Terminal................................. 11
Logging On and Off............................................................... 13
Remote Terminal Main Menu................................................ 14
Loopbacks _____________________________________________ 15
Appendix A - Specifications_______________________________ 18
Pinouts.................................................................................... 19
Craft Port................................................................................ 20
Insertion Loss......................................................................... 21
Appendix B - Functional Description_______________________ 22
Operational Capabilities......................................................... 22
Local and Line Powering....................................................... 22
Appendix C - Product Support____________________________ 24
Technical Support.................................................................. 24
World Wide Web................................................................... 24
Returns................................................................................... 25
Appendix D - Glossary___________________________________ 27
Certification and Warranty__________________Inside Back Cover

List of Figures 150-412-171-04, Revision 04
vi November 23, 1999 HRU-412 List 7A
LIST OF FIGURES
1.HRU-412 List 7A Front Panel................................................................3
2.HRU-412 List 7A Rear Panel.................................................................7
3.Connecting to a Maintenance Terminal................................................11
4.HRU-412 List 7A Loopbacks...............................................................15
5.HRU-412 List 7A Pinouts.....................................................................19
6.Craft Port Wiring..................................................................................20
LIST OF TABLES
1.HRU-412 List 7A Front Panel Components...........................................4
2.Rear Panel Components..........................................................................8
3.Remote Terminal Main Menu Items.....................................................14
4.HDSL Loss Over Cables.......................................................................21

150-412-171-04, Revision 04 Overview
HRU-412 List 7A November 23, 1999 1
OVERVIEW
ThePairGain®HiGain®Remote Unit, Model HRU-412 List 7A, isthe remote
end of a repeaterless T1 transmission system. An HRU-412 List 7A connects
to a HiGain Line Unit (HLU-231, HLU-232, HLU-319, or HLU-388),
creating a HiGain system that provides 1.544 Mbps transmission on two
unconditioned copper pairs over the full Carrier Service Area (CSA) range.
The CSA encompasses approximately 12,000 feet (3658 m) of AWG 24 wire
or 9,000 feet (2743 m) 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 7A 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-00312)
•Provisioning switches for customer premise equipment current, receive
level, and transmit loss of signal-initiated loopback or alarm
•Line or local power options
•Support for 3 span line powering
•Sealing current
•Front panel jacks for test access
•Craft port
•CPE current monitoring test points
•Front-panel HDSL margin threshold indicator for each loop
•Lightning and power cross protection on HDSL and DS1 interfaces
•784 kbps full-duplex 2B1Q HDSL transmission on two pairs
•DSO blocking support

Applications 150-412-171-04, Revision 04
2 November 23, 1999 HRU-412 List 7A
The HRU-412 List 7A supports PairGain’s 1-by-1 Protection Switching
System, and it can be line powered or locally powered with a metallic sealing
current option that is compatible with all HiGain line and doubler units. The
HDSL line resistive signature across both HDSL ports is 180 k
 .
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 wire pairs. The HiGain
system can be deployed on two unconditioned, non-loaded copper wire pairs
without repeaters, and without the need for bridged tap removal or binder
group separation.
A HiGain system operates with a variety of other T1, POTS, Digital Data
Service (DDS) equipment, or other HiGain systems sharing the same cable
binder group. HiGain systems provide temporary or permanent DS1 service
and can provide a means of deploying service in advance of fiber optic
transmission systems.

150-412-171-04, Revision 04 Front and Rear Panel
HRU-412 List 7A November 23, 1999 3
FRONT AND REAR PANEL
Figure 1 shows the front view of the HRU-412 List 7A.Table 1 describes the
unit’s front panel components.
Figure 1. HRU-412 List 7A Front Panel

Front and Rear Panel 150-412-171-04, Revision 04
4 November 23, 1999 HRU-412 List 7A
Table 1. HRU-412 List 7A Front Panel Components
Name Function
Test points Allow measurement of the 60 mA CPE current. The current is related
to the voltage measurement across the + and - test points by the
following relationship: CPE CURRENT=1 mA / 1 mV. Typical readings
range from 55 to 65 mV which equate to a 55 to 65 mA current range.
Receive (RCV)
and transmit
(XMT) jacks
Provide splitting and monitor access to the CPE DS1 interface. The
jacks are isolated from the CPE DS1 metallic interface by a
transformer.
Alarm LEDs The REM LOS LED is steady red indicating a loss of signal (LOS) at the
T1 input to the HLU. This LOS condition causes the HRU-412 to
transmit the alarm indicating signal (AIS) pattern toward the CPE.
The LOC LOS LED is steady red indicating a loss of signal (LOS) at the
T1 input to the HRU-412. This LOS condition transmits the AIS pattern
toward the DSX-1 (TLOS Disabled) or to execute a logic loopback in
the HRU-412 (TLOS Enabled).
Loopback (LB)
LEDs
The NET LED is steady green indicating the HRU-412 is in a loopback
state in which the signal from the network is looping back to the
network.
The CI LED is steady yellow indicating the HRU-412 is in a loopback
state in which the signal from the customer interface (CI) is looping
back to the CI.
CODE LEDs The B8ZS LED is steady green indicating that the user DS1 code
option is set to B8ZS.
The AMI LED is steady yellow indicating that the user DS1 code option
is set to AMI.
The BPV LED is steady red indicating that the user DS1 code option is
set to BPV.
If the user DS1 code option is set to AUTO, the lit LED indicates what
DS1 signal is being received.
Note that the settings are made on the HLU.
Framing LEDs The framing option is set on the HLU.
The ESF LED is steady green indicating that the framing pattern of the
received signal is Extended Super Frame (ESF).
The SF LED is steady yellow indicating that the framing pattern of the
received signal is Super Frame (SF).
The ERR LED is steady red indicating that a DS1 frame error has
occurred. No frame LED lights when the HRU-412 input pattern is
unframed or when the framing option is set to UNFR (unframed).