PairGain HiGain Line Unit HLU-388 User manual

HIGAIN LINE UNIT
QUICK INSTALLATION GUIDE
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
™350-388-125-01x¨
SECTION 350-388-125-01
Model List Number Part Number CLEI Code
HLU-388 2E 150-1141-25 T1L2BBYAAA
MODE SEL
M
A
R
G
I
N
(dB)
SETUP
STATUS
RS
232
HLU 388
HG HDIAIN
L2E

350-388-125-01, Revision 01
ii June 30, 1998 HLU-388 List 2E
Revision History of This Practice
Copyright ©1998 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc.
Information contained in this 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.
Revision Release Date Revisions Made
01 June 30, 1998 Initial Release

350-388-125-01, Revision 01
HLU-388 List 2E June 30, 1998 iii
USING THIS MANUAL
Two types of messages, identified by icons, appear in the text.
INSPECTING SHIPMENT
Upon receipt of the equipment:
•Unpack each container and visually inspect it forsigns 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
described in the Warranty. If you must store the equipment for a
prolonged period, store the equipment in its original container.
Notes contain information about special circumstances.
Cautions indicate the possibility of equipment damage or the
possibility of personal injury.

350-388-125-01, Revision 01
iv June 30, 1998 HLU-388 List 2E
ABBREVIATIONS
AMI Alternate Mark Inversion
B8ZS Bipolar with 8 Zero Substitution
CO Central Office
CSA Carrier Service Area
ES Errored Seconds
ESF Extended Superframe
HDSL High-bit-rate Digital Subscriber Line
HDU HiGain Doubler Unit
HLU HiGain Line Unit
HRU HiGain Remote Unit
NVRAM Non-Volatile Random Access Memory
SF Super Frame
ZBTSI Zero Byte Time Slot Interface

350-388-125-01, Revision 01
HLU-388 List 2E June 30, 1998 v
TABLE OF CONTENTS
Product Overview________________________________________ 1
HLU-388 Features ................................................................... 1
Compatibility ........................................................................... 2
Front Panel...............................................................................3
Front Panel Messages ..............................................................5
Card-Edge Connector............................................................... 9
Installation ____________________________________________ 10
HDSL Line Voltage _____________________________________ 11
Provisioning ___________________________________________ 12
Using the Front Panel Buttons............................................... 12
Restoring Default Settings..................................................... 13
Using the Maintenance Terminal Menus............................... 14
Connecting to the Craft Port.................................... 14
Navigating the Maintenance Terminal Menus ........ 15
Selecting an Option ................................................. 15
System Options Settings.......................................... 16
Alarms ________________________________________________ 20
Loopbacks _____________________________________________ 22
Specifications __________________________________________ 23
Product Support________________________________________ 25
Related Documentation.......................................................... 25
Technical Support.................................................................. 25
Warranty ................................................................................ 26
FCC Compliance _______________________________________ 27
Modifications __________________________________________ 27
Standards Compliance___________________________________ 28

350-388-125-01, Revision 01
vi June 30, 1998 HLU-388 List 2E

350-388-125-01, Revision 01 Product Overview
HLU-388 List 2E June 30, 1998 1
PRODUCT OVERVIEW
The PairGain®HiGain®HLU-388 List 2E is the Central Office (CO) side of
a repeaterless, T1 transmission system. When used in conjunction with a
HiGainRemoteUnit(HRU)thesystemprovides1.544Mbpstransmissionon
two unconditioned copper pairs over the full Carrier Service Area (CSA)
range. This line unit can be used in applications with or without HiGain
doubler units (HDUs).
The CSA includes loops up to 12,000 feet of 24 AWG or 9,000 feet of
26 AWG wire, including bridged taps. The HiGain system uses HDSL
transmission technology as recommended by Bellcore TA-TSY-001210.The
HiGain system complies with TR-TSY-000063 (Network Equipment
Building System (NEBS) Generic Equipment Requirements) and
TR-TSY-000499 (Transport System Generic Requirements (TSGR)
Common Requirements).
HLU-388 FEATURES
•Selectable DS1 pre-equalizer
•130 to 200 Vdc HDSL line power for HDU and HRU
•Front panel HDSL Signal-to-Noise margin display
•Compatible with high-density DDM+shelves
•Selectable loopback activation codes
•RS-232 Craft port for connection to a maintenance terminal
•Compatible with PairGain Management System
•Ground fault detect circuit
•Front panel operator setup
•Lightning and power cross protection on HDSL interfaces
•Full duplex 2B1Q HDSL transmission at 784 kbps on two wire pairs
•Front panel status LED
•On/off power cycling from front panel
•DS1 Loss Of Signal (LOS) detector (125 consecutive 0s)

Product Overview 350-388-125-01, Revision 01
2 June 30, 1998 HLU-388 List 2E
•Margin threshold alarm
•HDSL Alarm Indicator Signal (AIS) and SmartJack AIS options
•Easily restored factory default settings
•Circuit ID option
COMPATIBILITY
The HLU-388 List 2E is compatible with the following T1 repeater shelves
and associated equipment:
•Shelf (23-inch)
–Larus FT2 1188 (28-slot, connectorized)
–AT&T DS1 Ext. (28-slot, connectorized)
•Shelf (19-inch)
–Larus FT21187 (20-slot, connectorized)
•Cabinet Distant Terminal (23-inch)
–Larus FT2 1190 (12 slots) for a 51A cabinet.

350-388-125-01, Revision 01 Product Overview
HLU-388 List 2E June 30, 1998 3
FRONT PANEL
Figure 1 shows the HLU-388 front panel. Table 1 describes the front panel
components.
Figure 1. The HLU-388 Front Panel
Front panel display
List number
Craft port
System option buttons
Status LED
Configuration number
CLEI/ECI bar code
label
M
A
R
G
I
N
(dB)
HLU-388
HiGain HD
L
RS
232
STATUS
SETUP
MODE SEL
PAIRGAIN

Product Overview 350-388-125-01, Revision 01
4 June 30, 1998 HLU-388 List 2E
Table 1. Front Panel Components and Labels
Front Panel Feature Function
Front panel display Displays four-character status, provisioning, and alarm
system messages.
System option buttons
(MODE and SEL)
Permits the user options to be monitored and modified
without the need of a maintenance terminal. Used to initiate
all HiGain loopbacks and to display DSX-1 line parameters
and line unit identity.
Status LED See Table 2 for status descriptions.
Craft (RS-232) port Bantam 210 jack provides bidirectional communication
between the unit and an external terminal to allow
configuration and performance monitoring through the
Maintenance Terminal menus.
CLEI/ECI bar code label Provides the human-readable Common Language
Equipment Identifier (CLEI) code number and the
Equipment Catalog Item (ECI) bar code number.
Configuration Number The configuration number is a two or three-digit number
that is either the last digits of a five or six-digit warranty
control number or a standalone configuration number of
two or three digits. For example, a number of “80107”
would indicate a warranty beginning in the year 1998 (8),
during the month of January (01), and the unit’s
configuration number of 7 (07).

350-388-125-01, Revision 01 Product Overview
HLU-388 List 2E June 30, 1998 5
The HLU-388 front panel tri-color Status LED has the following states:
FRONT PANEL MESSAGES
The front panel display has many useful system diagnostic messages. They
are listed in Table 3. The display turns on when power is initially applied to
the HLU-388. To conserve power, the display only remains on for five
minutes if neither the MODE or SEL buttons are pressed. The use of either
button activates the four-character display and restarts the five-minute
power-control timer.
Table 2. Status LED Descriptions
LED Status Description
Green Normal operation.
Flashing green HDSL acquisition.
Red Fuse alarm.
Flashing red System alarm.
Yellow Self Test is in process or an HLU-388 Customer Remote Loopback
(CREM) or a Network Local Loopback (NLOC) is in effect.
Flashing yellow HLU-388 is in an Armed state.

Product Overview 350-388-125-01, Revision 01
6 June 30, 1998 HLU-388 List 2E
Table 3. Front Panel Display Messages
Message Full Name Description
CREM Customer Remote Loopback Signal from customer is looped back to the
customer at HLU-388.
NLOC Network Local Loopback DSX-1 signal is looped back to DSX-1 at the
HLU.
CLOC Customer Local Loopback Signal from customer is looped back to the
customer at the HRU.
NREM Network Remote Loopback DS1 signal is looped back to DS1 at the HRU.
SMJK Remote SmartJack
Loopback
Signal from DS1 is looped back at the HRU by
the HRU SmartJack module.
TLOS Transmit Loss Of Signal HRU is in a logic loopback state caused by a
loss of its T1 input from the CI, if enabled at
the HRU by its TLOS switch option.
FERR Framing Bit Error Occurred Framing bit error occurred at the HLU T1
input.
LBPV Local Bipolar Violation A bipolar violation has been received at the T1
input to the HLU-388.
SIG 1 or 2 Signal 1 or Signal 2 The transceivers of the HLU, HRU or first
doubler are trying to establish contact with
each other on loops 1 or 2 of span 1.
S2L1 or 2 Signal 2 Loop 1 or Loop 2 The transceivers of the first doubler and
either the HRU or second doubler are trying
to establish contact with each other on loops
1 or 2 of span 2.
ACQ 1 or 2 Acquisition 1 or
Acquisition 2
The multiplexers of the HLU and HRU or first
doubler are trying to establish
synchronization over loops 1 or 2 of span 1.
H1ES HDSL CRC Error Channel 1 HLU HDSL Loop 1 CRC error.
H2ES HDSL CRC Error Channel 2 HLU HDSL Loop 2 CRC error.
ARM HiGain System ARMED Armed to respond to Intelligent Repeater
Loop Codes.

350-388-125-01, Revision 01 Product Overview
HLU-388 List 2E June 30, 1998 7
ACO Alarm CutOff A system alarm has occurred, and has been
retired to an ACO condition, by pressing the
SEL button on the HLU front panel.
SELF TEST Self Test The HLU is in a self-test mode. This occurs
every power ON/OFF cycle.
ALRM Alarm Condition Exists A system alarm condition is in effect.
1=xx or 2=yy HDSL Loop Margins Indicates the power of the received HDSL
signal on each loop relative to noise. Any
value of ‘06’ or greater is adequate for reliable
system operation.
PWR FEED
SHRT
Power Feed Short Indicates a short between the two HDSL
pairs. This same message can occur with an
HRU that is drawing the correct amount of
power over good cable pairs but cannot
communicate with the HLU.
PWR FEED
OFF
Power Feed Off HDSL span power has been turned off by
setting the PWFD option to DIS, or HDSL
span power has been turned off by using the
A1LB/A2LB/A5LB Intelligent Office Repeater
(IOR) Power Down code.
BAD RT? No response from HRU The HLU does not receive any response from
the HRU. Thus, the integrity of the HRU or the
two HDSL loops (they may be open) is
questionable.
FRM Frame: SF, ESF, UNFR,
NONE
Defines the type of frame pattern being
received from the DSX-1. Displayed during
System Settings review mode.
CODE Line Code: AMI, B8ZS The line code that the HLU-388 is receiving at
its DSX-1 interface, if the DS1 option is set to
Auto. Otherwise, it mimics either of the other
two DS1 line code settings, AMI or B8ZS.
Displayed during System Settings review
mode.
LOSW Loss of Sync Word Indicates that one of the HDSL loops has lost
sync. Causes a system alarm.
Table 3. Front Panel Display Messages (Cont.)
Message Full Name Description

Product Overview 350-388-125-01, Revision 01
8 June 30, 1998 HLU-388 List 2E
LLOS Local Loss of Signal Indicates that no signal is detected at the T1
input to the HLU. Causes a system alarm.
RLOS Remote Loss of Signal Indicates that no signal is detected at the T1
input to the HRU. Causes a system alarm.
DS0 DS0 Blocked Channels Indicates status of DS0 blocked channels.
NONE indicates no channels are blocked. BLK
indicates some channels are blocked.
DS1 DS1 BPV Errors Indicates that the number of BPVs at the HLU
or HRU T1 inputs have exceeded the 24-hour
ES threshold. Causes a minor alarm.
MNGD Managed The HLU-388 is under control of the
HMU-319 network management unit. In this
state, the front panel Craft port is disabled.
VER xxxx HLU-388 software version
number
The software version number displays during
the System Settings review mode. Press the
MODE button for three seconds to display the
software version.
LIST xxxx HLU-388 List number The List number displays during the System
Settings review mode. Press the MODE
button for three seconds to display the List
number.
MAL1
MAL2
Margin Alarm Loop 1 or 2 The margin on HDSL loop 1 (2) has dropped
below the threshold (1 to 15 dB) as set by the
operator.
Table 3. Front Panel Display Messages (Cont.)
Message Full Name Description

350-388-125-01, Revision 01 Product Overview
HLU-388 List 2E June 30, 1998 9
CARD-EDGE CONNECTOR
Figure 2 shows the HLU-388 card-edge connector pinouts.
Figure 2. HLU-388 Card Edge Connector Pinouts
106
105
104
103
102
101
100
DSX-1RCV
DSX-1XMT
HDSL2
HDSL1
205
204
203
202
201
200
119
118
117
116
115
114
113
112
111
110
GND GND
FRAMEGND
MJF*
RING1
RING1
TIP1
TIP1
(MNG.BUS)
RING
RING
TIP
TIP
(FACTORYBURN-IN)
-48VDC
219
218
217
216
215
214
213
212
211
210
209
208
207
206
109
108
107
* MJF is normally floating (0 to 80V max.) and at
-48V (10mA max.) when activated.

Installation 350-388-125-01, Revision 01
10 June 30, 1998 HLU-388 List 2E
INSTALLATION
1Slide the HLU-388 into the shelf card guides for the desired slot, then
push the unit in until it is entirely within the card guide.
Figure 3. Installing the HLU-388
2Push the HLU-388 into the card-edge connector until it is entirely within
the card guides and the retaining latch closes, which indicates that the
card is properly seated.
This product contains static-sensitive components. Be sure
to ground yourself properly before touching the
HLU-388.
HLU-388
CO shelf

350-388-125-01, Revision 01 HDSL Line Voltage
HLU-388 List 2E June 30, 1998 11
HDSL LINE VOLTAGE
The HLU-388 sets the HDSL line voltage to either 140 V (for non-doubler
applications) or 200 V (for doubler applications) on loop 1. The 140 V output
voltageusedinnon-doublerunitapplicationsisalwaysnegativeandunipolar.
This keeps the HDSL cable pair voltage at or below ground potential, thereby
avoiding corrosion problems caused by cable voltages more positive than
ground.
The 200 Voutput voltage used in doubler unit applications is always bipolar,
due to the HLU-388 ground fault detect (GFD) circuit. The specific bipolar
voltage levels existing between ground and the two loops for doubler unit
applications depend on the following factors:
•loop length
•number of doubler units
•type of doubler units (List)
•whether the HRU is line powered or locally powered
The GFD circuit immediately detects ground faults occurring at any point
along any span on any conductor, and forces the HiGain power supply to shut
off. The line unit then applies the HDSL power periodically to the first span.
If the ground fault is still present, the HDSL power is again shut off. This
power cycling and ground fault protection continues as long as the fault
condition exists.

Provisioning 350-388-125-01, Revision 01
12 June 30, 1998 HLU-388 List 2E
PROVISIONING
There are two methods for provisioning the HLU-388:
•Use the MODE and SEL buttons on the front panel.
•Access system settings menus through the Craft port.
No dip switches or jumpers are required to provision the HLU-388.
The HLU-388 contains a non-volatile RAM (NVRAM) which stores the
system option settings. System settings are retained if shelf power is lost or if
the HLU-388 is unplugged.
USING THE FRONT PANEL BUTTONS
To provision the HLU-388 through the MODE and SEL buttons on the front
panel:
1Press the MODE button and release it after one second.
The message displayed on the front panel alternates between the first
system parameter and its current setting.
2Press the SEL button to step the display through all possible settings (one
at a time) of the selected parameter.
3After the desired setting has been selected, press the MODE button.
This updates the current displayed mode to the selected setting, and then
advances to the next configurable parameter.
After the last parameter has been selected, the following message
appears on the front panel display:
CONF NO

350-388-125-01, Revision 01 Provisioning
HLU-388 List 2E June 30, 1998 13
4Do one of the following:
•To cancel the session without saving the requested parameter
changes, press the MODE button or do nothing. (After 30 seconds,
the display returns to its normal mode without saving the new
changes.)
•Toaccepttherequestedparameterchanges,presstheSELbutton.(A
CONF YES message displays, and the display returns to its normal
mode after saving the new changes.)
RESTORING DEFAULT SETTINGS
All user options can be set to the factory default values using the SEL and
MODE buttons. To set the user options to their default values:
1Press the SEL button for six seconds until the following message
appears, then release the button:
DFLT NO
2Press the SEL button while the DFLT NO message is displayed.
The message changes to DFLT YES indicating the factory default values
are now in effect.
To terminate the DFLT mode without setting the factory default values, do
one of the following:
•Press the MODE button or
•Wait 30 seconds for the display to return to its normal state.

Provisioning 350-388-125-01, Revision 01
14 June 30, 1998 HLU-388 List 2E
USING THE MAINTENANCE TERMINAL MENUS
The 9-pin, Craft (RS-232) port on the front panel allows you to connect the
HLU-388 to a maintenance terminal or PC running a terminal emulation
program. Once connected to a maintenance terminal, you can access the
maintenance, provisioning, and performance screens.
Connecting to the Craft Port
A miniature, 3-pin, 210 Bantam-type jack on the front panel serves as an
RS-232 Craft port and allows connection between the HLU-388 and a
maintenance terminal or PC running a terminal emulation program. The Craft
port is configured as Data Communications Equipment (DCE). A 210 to
DB-9 adapter is provided with every unit to facilitate the use of standard
RS-232, DB-9 cables. Once connected to a maintenance terminal, you can
access the maintenance, provisioning, and performance screens.
To connect to a maintenance terminal:
1Insert the 210-to-DB9 adapter into the RS-232 Jack on the HLU-388
front panel.
2Connect an RS-232 cable to the adapter.
3Connect the other end of the cable to the consoleport on the maintenance
terminal.
4If necessary, start a terminal emulation program.
5Configure the maintenance terminal to the following communication
settings:
•1200 to 9600 baud (9600 baud is recommended)
•no parity
•8 data bits
•1 stop bit
•hardware flow control to OFF