PairGain HiGain Line Unit HLU-388 User manual

HIGAIN LINE UNIT
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
™150-388-125-01v¨
SECTION 150-388-125-01
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
L

150-388-125-01, Revision 01
ii September 15, 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 toPairGain 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 September 15, 1998 Initial Release

150-388-125-01, Revision 01 Using This Technical Practice
HLU-388 List 2E September 15, 1998 iii
USING THIS TECHNICAL PRACTICE
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 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 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.

Inspecting Shipment 150-388-125-01, Revision 01
iv September 15, 1998 HLU-388 List 2E

150-388-125-01, Revision 01 Table of Contents
HLU-388 List 2E September 15, 1998 v
TABLE OF CONTENTS
Overview ____________________________________________________________________________ 1
Features..............................................................................................................................................1
Applications .......................................................................................................................................2
Applications Without HiGain Doublers ..............................................................................2
Applications With HiGain Doublers ...................................................................................2
Product Description ___________________________________________________________________ 3
Front Panel.........................................................................................................................................3
Status LED...........................................................................................................................4
Front Panel Display.............................................................................................................4
Card Connector ..................................................................................................................................7
Network Management Control Bus.....................................................................................7
Fuse Alarm ..........................................................................................................................7
Installation___________________________________________________________________________ 8
Provisioning__________________________________________________________________________ 9
Setting Options Through SEL and MODE........................................................................................9
Factory Default Values........................................................................................................9
Displaying System Inventory ............................................................................................10
Connecting to a Maintenance Terminal...........................................................................................10
Maintenance ________________________________________________________________________ 12
Navigating the Maintenance Terminal Screens ...............................................................................12
System Spans.....................................................................................................................12
Navigation Keys ................................................................................................................12
Selecting an Option ...........................................................................................................13
Initializing the Maintenance Terminal Screens ...............................................................................13
Maintenance Terminal Main Menu..................................................................................................13
View Span Status .............................................................................................................................14
Span Status Screen: Non-Doubler Applications................................................................14
Span Status Screen: Doubler Applications........................................................................14
Span Status Fields, Alarms, and Loopbacks......................................................................17
Set Clock..........................................................................................................................................19
Set Time.............................................................................................................................19
Set Date..............................................................................................................................19
Update the HRU Time and Date........................................................................................20

Table of Contents 150-388-125-01, Revision 01
vi September 15, 1998 HLU-388 List 2E
System Settings ............................................................................................................................... 20
DS0 Blocking Option........................................................................................................ 21
DS1 Line Code Option...................................................................................................... 21
Margin Alarm Threshold .................................................................................................. 21
HAIS Selections................................................................................................................ 22
System Settings Menu Options ....................................................................................................... 23
Loopback Menu............................................................................................................................... 25
Loopback Menu: No Doubler........................................................................................... 26
Loopback Menu: One Doubler ......................................................................................... 26
Initiating Loopbacks ......................................................................................................... 27
Disable Loopbacks............................................................................................................ 27
View Performance Data .................................................................................................................. 28
Performance Data Screen: No Doubler............................................................................. 29
Performance Data Screen: With Doubler.......................................................................... 30
View Performance History.............................................................................................................. 30
The 7 Day History Screen: No Doubler............................................................................ 31
The 7 Day History Screen: With Doubler......................................................................... 32
View Alarm History........................................................................................................................ 32
Alarm History Screen: No Doubler .................................................................................. 33
Alarm History Screen: With Doubler ............................................................................... 34
Circuit ID Option............................................................................................................................. 34
System Alarms_______________________________________________________________________ 35
Retiring System Alarms .................................................................................................................. 36
Self Test........................................................................................................................................... 36
Loopback Operation__________________________________________________________________ 36
Generic Loopback Code (GNLB) ................................................................................................... 36
Addressable Repeater Loopback Functions .................................................................................... 37
Initiating Manual Loopback Sessions .............................................................................................38
Loopback Test Procedures .............................................................................................................. 39
Loopback Operation Without Doublers .......................................................................................... 39
Loopback Operation With Doublers ............................................................................................... 40
GNLB Loopback Test Procedures...................................................................................................41
A1LB, A2LB, and A5LB Test Procedures....................................................................... 42
A3LB and A4LB Test Procedures .................................................................................... 45
Appendix A - Technical Specifications ___________________________________________________ 47
Appendix B - Abbreviations____________________________________________________________ 48

150-388-125-01, Revision 01 Table of Contents
HLU-388 List 2E September 15, 1998 vii
Appendix C - Functional Operation_____________________________________________________ 50
HDSL Line Voltage...........................................................................................................51
Ground Fault Detect ..........................................................................................................52
Power Consumption.........................................................................................................................52
Power Consumption: Without Doublers............................................................................52
Maximum Power Dissipation:.............................................................................52
Maximum Power Consumption: .........................................................................52
Maximum Current Drain:....................................................................................52
Power Consumption: With Doublers.................................................................................53
Appendix D - Compatibility ___________________________________________________________ 54
T1 Repeater Shelves and Related Equipment..................................................................................54
Doubler Deployment........................................................................................................................54
Appendix E - Product Support _________________________________________________________ 55
Technical Support............................................................................................................................55
Warranty...........................................................................................................................................55
FCC Compliance..............................................................................................................................56
Modifications...................................................................................................................................56
Standards Compliance......................................................................................................................56
Bar Code and Configuration Number Information..........................................................................57

Table of Contents 150-388-125-01, Revision 01
viii September 15, 1998 HLU-388 List 2E

150-388-125-01, Revision 01 List of Figures
HLU-388 List 2E September 15, 1998 ix
LIST OF FIGURES
1. HLU-388 List 2E Front Panel ......................................................................................................................3
2. HLU-388 List 2E Card-Edge Connector......................................................................................................7
3. Installing the HLU-388 into a Shelf.............................................................................................................8
4. DB-9 RS-232 I/O Pinouts...........................................................................................................................11
5. System Spans..............................................................................................................................................12
6. Maintenance Terminal Main Menu............................................................................................................13
7. Span Status Screen: No Doubler ................................................................................................................15
8. Span 1 Status Screen: With Doubler..........................................................................................................15
9. Span 2 Status Screen ..................................................................................................................................16
10. Set Clock Menu........................................................................................................................................19
11. System Settings Menu..............................................................................................................................20
12. Loopback Menu: No Doubler...................................................................................................................26
13. Loopback Menu: One Doubler.................................................................................................................26
14. NLOC Loopback Mode in the Maintenance Terminal Main Menu.........................................................27
15. Performance Data Screen: No Doublers...................................................................................................29
16. Span 2 Performance Data Screen.............................................................................................................30
17. 7 Day History Screen for Span 1: No Doubler.........................................................................................31
18. 7 Day History Screen Span 1: With Doubler ...........................................................................................32
19. Alarm History Screen for Span 1: No Doubler........................................................................................33
20. Alarm History Screen for Span 1: With Doubler.....................................................................................34
21. HLU-388 Non-Doubler Loopback Configurations..................................................................................39
22. Doubler Loopback Configurations...........................................................................................................40
23. HLU-388 Block Diagram.........................................................................................................................50
24. Bar Code Label and Configuration Number ............................................................................................57

List of Tables 150-388-125-01, Revision 01
x September 15, 1998 HLU-388 List 2E
LIST OF TABLES
1. HDSL Loss Over Cables.............................................................................................................................. 2
2. Front Panel Components and Labels ........................................................................................................... 4
3. Status LED Descriptions.............................................................................................................................. 4
4. Front Panel Display Messages .................................................................................................................... 5
5. Navigational Keys on the Maintenance Terminal ..................................................................................... 12
6. Maintenance Terminal Screens.................................................................................................................. 14
7. Span Status Fields and Descriptions ......................................................................................................... 17
8. HLU-388 Status Menu Messages ............................................................................................................. 18
9. HLU-388 System Settings Menu Options ................................................................................................ 23
10. Errored and Unavailable Seconds Definitions......................................................................................... 28
11. Alarm History Fields and Descriptions ................................................................................................... 33
12. HDSL System Alarms ............................................................................................................................. 35
13. Addressable 1, 2, 5 (A1LB, A2LB, A5LB) Repeater Loopback Commands.......................................... 44
14. Addressable 3 and 4 (A3LB and A4LB) Repeater Loopback Commands.............................................. 46
15. HLU-388 Power Parameters With HDU-451.......................................................................................... 53
16. Bar Code Label and Configuration Number Descriptions....................................................................... 57

150-388-125-01, Revision 01 Overview
HLU-388 List 2E September 15, 1998 1
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 HiGain Remote Unit (HRU) the system provides 1.544 Mbps
transmission on 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).
FEATURES
•Selectable DS1 pre-equalizer
•130 to 200 Vdc HDSL line power for doubler and HRU
•Front panel HDSL Signal-to-Noise margin display
•Compatible with high-density Span Terminating Shelves (STS)
•Selectable loopback activation codes
•RS-232 Craft port for connection to a maintenance terminal
•Compatible with PairGain Management System
•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)
•Margin threshold alarm
•HDSL Alarm Indicator Signal and SmartJack AIS options
•Easily restored factory default settings
•Circuit ID option

Overview 150-388-125-01, Revision 01
2 September 15, 1998 HLU-388 List 2E
APPLICATIONS
HiGain systems provide a cost-effective, easy-to-deploy method for delivering T1 High Capacity Digital Service
(HCDS) over metallic pairs.
•The service is deployed over two unconditioned, non-loaded copper pairs, yet it demonstrates a quality that
is competitive with fiber optics.
•Conventional, in-line, T1 repeaters are not required.
•Cable pair conditioning, pair separation and bridged tap removal are not required.
Each loop has no more than 35 dB of loss at 196 kHz, with driving and terminating impedances of 135 Ω.
Table 1 provides a “loss” guide forthe various cable gauges at 196 kHz and 135 Ω. The table applies to the HDSL
cable pairs between the HLU, HRU, and HDU modules. In the absence of specific insertion loss measurement
data, add 3 dB for each bridged tap and 1 dB for each cable gauge change.
In general, HiGain systems:
•operate with any number of other T1, POTS, Digital Data Service (DDS) or other HiGain systems sharing the
same cable binder group
•can be used with customers requiring DS1 service on a temporary or permanent basis
•provide a means of quickly deploying service in advance of fiber-optic transmission systems
With a HiGain system, service can be provided within hours. Fiber-optic systems can be installed incrementally
and cut-over from the installed HiGain system when convenient to do so.
Applications Without HiGain Doublers
For applications without doublers, the HLU-388 is directly connected to the HRU by the two HDSL cable pairs.
The HLU-388 is compatible with all HiGain HRUs.
Applications With HiGain Doublers
For doubler applications, one or two doublers may be used in the HDSL loops between the HLU and HRU. When
using two doublers, the HRU must be locally powered.
Table 1. HDSL Loss Over Cables
Cable Gauge (AWG/mm) Loop Loss at
196 kHz (dB/kft)
Loop Resistance
(Ωper kft)
26 / 0.4 3.88 83
24 / 0.51 2.84 52
22 / 0.61 2.18 32
19 / 0.91 1.54 16
For compatibility guidelines on mixing newer doublers with older HRU and HLU models, refer
to “Doubler Deployment” on page 54.

150-388-125-01, Revision 01 Product Description
HLU-388 List 2E September 15, 1998 3
PRODUCT DESCRIPTION
The HLU-388 List 2E includes:
•A front panel featuring:
–A status display
–System option buttons
–Status LED
–Craft port (RS-232)
–CLEI/ECI bar code number
–Configuration number
•A card-edge connector
FRONT PANEL
The HLU-388 List 2E front panel is shown is Figure 1. The front panel components are described in Table 2 on
page 4.
Figure 1. HLU-388 List 2E 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 Description 150-388-125-01, Revision 01
4 September 15, 1998 HLU-388 List 2E
Status LED
Table 3 describes the functions of the Status LED on the front panel.
Front Panel Display
The front panel display is used with the MODE and SEL buttons to display system diagnostic messages. Refer to
Table 4 for a listing of the four-character messages.
The front panel display turns on when power is initially applied to the HLU-388. To conserve power, the display
only remains on for four minutes. The use of the MODE or SEL buttons activates the front panel display and
restarts the four minute, power-control timer.
Table 2. Front Panel Components and Labels
Front Panel Feature Function
List number The HLU-388 version number.
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 3 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 screens.
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).
Table 3. 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.

150-388-125-01, Revision 01 Product Description
HLU-388 List 2E September 15, 1998 5
Table 4. 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 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 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.
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 use of 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.

Product Description 150-388-125-01, Revision 01
6 September 15, 1998 HLU-388 List 2E
CODE Line Code: AMI, B8ZS The line code that 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.
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), which is set by the operator.
Table 4. Front Panel Display Messages (Cont.)
Message Full Name Description

150-388-125-01, Revision 01 Product Description
HLU-388 List 2E September 15, 1998 7
CARD CONNECTOR
Figure 2 shows the card-edge connector on the HLU-388. Active pins are highlighted in black.
Figure 2. HLU-388 List 2E Card-Edge Connector
Network Management Control Bus
The HLU-388 provides a Network Management Control Bus on pin 104 of the card-edge connector. This allows
the various PairGain Management System protocols to manage the HLU through the HMU-319 HiGain
Management Unit. Whenever the HLU-388 is under management, the MNGD message displays periodically on the
HLU-388 front panel display.
Fuse Alarm
Pin 117 on the card-edge connector is a Fuse Alarm that is driven to -48V whenever the onboard fuse opens. It
emulates the function ofthe MJF output of normal high-density DDM+ T1 repeaters. Its normally floating output
must never be driven above ground or below -80V. It can sink a current of 10 mA.
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 150-388-125-01, Revision 01
8 September 15, 1998 HLU-388 List 2E
INSTALLATION
To install the HLU-388:
1Slide the HLU-388 into the card guides for the desired slot, then push the unit back until it touches the
backplane card-edge connector and the retaining latch on the front panel opens (Figure 3).
Figure 3. Installing the HLU-388 into a Shelf
2Place your thumbs on the HLU-388 front panel and push the HLU-388 into the card-edge connector until it
is entirely within the card guides and the retaining latch closes. This 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

150-388-125-01, Revision 01 Provisioning
HLU-388 List 2E September 15, 1998 9
PROVISIONING
There are two methods for provisioning the HLU-388:
•Use the MODE and SEL buttons on the front panel.
•Access system settings screens through the Craft port.
No dip switches or jumpers are required to provision the HLU-388 as it 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.
SETTING OPTIONS THROUGH SEL AND MODE
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
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.)
•To accept the requested parameter changes, press the SEL button. (A CONF YES message displays, and
the display returns to its normal mode after saving the new changes.)
In either case the display returns to its normal mode.
Factory Default Values
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:
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 150-388-125-01, Revision 01
10 September 15, 1998 HLU-388 List 2E
Displaying System Inventory
To scroll through an inventory of system parameters, press the MODE button for three or more seconds. The
following parameters are displayed:
•HLU software version number
•HLU List number
•Type of frame pattern being received from the DSX-1
•Line code setting of the HLU-388
•All 14 option settings
CONNECTING TO AMAINTENANCE TERMINAL
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 (ASCII 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. See (Figure 4). 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 HLU-388 front panel.
2Connect an RS-232 cable to the adapter.
3Connect the other end of the cable to the console port 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
The line code parameter is the actual DSX-1 line code being received by the HLU if the DSX-1
code pattern is set to AUTO. Otherwise, the line code parameter mimics either of the other two
line code settings, AMI or B8ZS.