PairGain HLU-319 User manual

HIGAIN LINE UNIT
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
SECTION 150-319-142-01
Revision History of This Practice
Revision 01—December 22, 1997
A) Initial Release
Model List Number Part Number
HLU-319 4B 150-1140-42

Revision 01 December 22, 1997 150-319-142-01
ii PairGain Engineering - Plant Series HLU-319 List 4B
©Copyright 1997 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc.
Information contained inthis document is 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.

150-319-142-01 December 22, 1997 Revision 01
HLU-319 List 4B PairGain Engineering - Plant Series iii
USING THIS MANUAL
Two types of messages, identified by icons, appear in the text.
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or the
possibility of personal injury.

Revision 01 December 22, 1997 150-319-142-01
iv PairGain Engineering - Plant Series HLU-319 List 4B

150-319-142-01 December 22, 1997 Revision 01
HLU-319 List 4B PairGain Engineering - Plant Series v
TABLE OF CONTENTS
Overview _______________________________________________ 1
Application _____________________________________________ 2
Specifications ___________________________________________ 3
Functional Description____________________________________ 4
Operational Capabilities........................................................... 4
Alarms...................................................................................... 6
Front Panel Features ................................................................ 8
Installation ____________________________________________ 10
Unpack and Inspect the Shipment.......................................... 10
Install the HLU-319 List 4B .................................................. 10
Configure, Provision, and Monitor Performance _____________ 12
Connect a Dumb Terminal..................................................... 12
Log On and Use the Menus ................................................... 13
View Span Status..................................................... 14
Set Clock ................................................................. 15
System Settings ....................................................... 16
Select Loopback Test .............................................. 17
View Performance Data .......................................... 18
View Performance History...................................... 19
View Alarm History................................................ 20
Enter Circuit ID Number......................................... 20

Revision 01 December 22, 1997 150-319-142-01
vi PairGain Engineering - Plant Series HLU-319 List 4B
System Options.......................................................................21
Set Options Using the MODE and SEL Buttons.....21
Set Factory Default Values......................................22
Product Identification...............................................22
System Setting Options............................................23
Power Consumption ...............................................................28
Loopback Operation _____________________________________29
Generic Loopback Code (GNLB) ..........................................29
Addressable Repeater Loopback Functions ...........................29
Initiating Manual Loopback Sessions ....................................30
Loopback Test Procedures .....................................................32
GNLB Loopback Test Procedures...........................33
A1LB, A2LB, and A5LB Test Procedures..............34
A3LB and A4LB Test Procedures...........................38
HiGain Terms___________________________________________40
Front Panel Messages ____________________________________41
Certification and Warranty _______________________________45
VCCI Certification .................................................................45
UL Listing ..............................................................................45
Warranty.................................................................................46
Technical Support _______________________________________47
Phone or Fax...........................................................................47
Returns....................................................................................47
World Wide Web....................................................................48

150-319-142-01 December 22, 1997 Revision 01
HLU-319 List 4B PairGain Engineering - Plant Series 1
OVERVIEW
The PairGain®HiGain®HiGain Line Unit Model HLU-319 List 4B is the
Central Office (CO) side end of a repeaterless T1 transmission system. An
HLU-319 List 4B connects to a HiGain Remote Unit (such as an HRU-412
List 8B), creating a HiGain system which provides 1.544 Mbps payload
transmissionontwo unconditionedcopperpairscovering3658m of0.51 mm
wire or 2743 m of 0.4 mm wire, including bridge taps and gauge changes.
A HiGain system utilizes 2B1Q High-bit-rate Digital Subscriber Line
(HDSL)transmissiontechnology.TheHLU-319List4B complieswithANSI
T1E1.4, T1.403-1989, and T1E1.4/92-002R2 technical standards and
recommendations. The HLU-319 List 4B mounts in a single slot of an
industry standard 3192-type Mechanics shelf. The system complies with
Transport System Generic Requirements (TSGR) common requirements
TR-TSY-000499.
The HLU-319 List 4B features:
•Selectable DSX-1 pre-equalizer
•Front panel HDSL S/N margin display
•Selectable loopback activation codes
•Craft port (RS-232)
•Network Management Administration (NMA) interface
•Front panel operator setup stored in non-volatile memory
•Front panel DS1 splitting and bridge access
•Lightning and power-cross protection on HDSL interfaces
•784 kbps full duplex 2B1Q HDSL transmission on two pairs
•Front panel status indicating LED
•On/off front panel display power cycling
•DSX-1 LOS detector (125 consecutive zeros)
•Margin threshold alarm
•HDSL AIS and SmartJack AIS options

Revision 01 December 22, 1997 150-319-142-01
2 PairGain Engineering - Plant Series HLU-319 List 4B
•Easy return to factory default user settings
•Circuit ID option
•Low power consumption
APPLICATION
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 general guidelines for HiGain system usage is that each loop have less
than 35 dB of loss at 196 kHz, with 135 ohm driving and terminating
impedances.
Table 1 provides a guide for the loss over various cable gauges at 196 kHz
and 135ohms. The table applies to the HDSL cable pairs between theHiGain
line unit and the HiGain remote unit. Without specific loop insertion loss
data, 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 ohms over two HDSL simplex loops. This means, for example, where
3.7 km of 0.51 mm wire equals 34.08 dB (insertion loss), resistance is at 622
ohms which is well below the limit of 800 ohms.
Table 1. HDSL Loss over Cables
Cable Gauge Loss at 196 kHz
(db/km) Ohms per km
0.4 mm 12.7 272.3
0.51 mm 9.3 170.6
0.61 mm 7.2 105
0.91 mm 5.1 52.5

150-319-142-01 December 22, 1997 Revision 01
HLU-319 List 4B PairGain Engineering - Plant Series 3
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.
SPECIFICATIONS
HDSL Line Code 784 kbps 2B1Q
HDSL Output +13.5 dBm ±0.5 dB at 135 ohms
HDSL Line Impedance 135 ohms
Maximum Provisioning Loss 35 dB at 196 kHz, 135 ohms
Line Clock Rate Internal Stratum 4 clock
HDSL Start-up Time 30 seconds (typical), 60 seconds (maximum)
per span
One-way DS1 Delay <220 microseconds per span
DSX-1 Line Impedance 100 ohms
DSX-1 Pulse Output Pre-equalized for 0 to 655 feet of
ABAM-specification cable
DSX-1 Input Level +1.5 to -7.5 dB DSX
DSX-1 Line Rate 1.544 Mbps ±200 bps
DSX-1 Line Format AMI, B8ZS or ZBTSI
DSX-1 Frame Format ESF, SF or UNFR
Maximum Power Consumption 4.8 Watts
Maximum Heat Dissipation 4.0 Watts
Fusing Internal; connected to Fuse Alarm output on
pin 10
Margin Indicator Displays HDSL loop SNR margin for each
HDSL loop relative to 10-7 BER operation
Electrical Protection Secondary surge protection on DS1 and HDSL
ports; Power cross protection on HDSL ports

Revision 01 December 22, 1997 150-319-142-01
4 PairGain Engineering - Plant Series HLU-319 List 4B
FUNCTIONAL DESCRIPTION
This section describes the functions of the HLU-319 List 4B.
Operational Capabilities
The HiGain system utilizes PairGain 2-Bit 1-Quartenary (2B1Q) HDSL
transceiver systems to establish two full duplex 784 kbps data channels
between the HLU-319 List 4B and the HRU-412 List 8B. This provides a
total capacity of 1.568 Mbps between the two units.
The HiGain HLU-319 List 4B receives a 1.544 Mbps DS1 data stream from
the DSX-1 digital cross connect interface. The HLU-319 List 4B contains a
DSX-1 frame synchronizer controlled by an 8-bit microprocessor that
determines the type of framingon the DS1 stream and synchronizes to it. The
HLU-319 List 4B recognizes Super Frame (SF), including D4 or Extended
SuperFrame(ESF)framing. The HLU-319 List 4Barbitrarilydefines aframe
bit for unframed data.
The HLU-319 List 4B contains a multiplexer that generates two parallel 784
kbps data streams. The data streamscontain HDSL frames that are nominally
4704 bits (6 milliseconds) in length. The HDSL frames contain a 14-bit
Frame Sync Word (FSW), 6-bit Cyclic Redundancy Check (CRC), 21-bit
operations channel and DSX-1 payload. The DSX-1 stream separates into
two parallel streams that comprise the payloads of the HDSL channels. The
HLU-319 List 4B allocates DS0 time slots 1 through 12 to loop 1, and time
slots13 through24 toloop2 whenusedwithanHRU-412List 8B. The8kbps
frame bits of the DSX-1 stream are included on both HDSL channels. The
two formatted HDSL channels are passed to the HDSL transceivers which
Operating Temperature -40°C to +65°C
Humidity 5% to 95% (non-condensing)
Mounting STS, high-density slot
Dimensions
Height: 12.1 cm
Width: 1.78 cm
Depth: 26.7 cm