ADC HiGain HLU-200 User manual

HiGain
HiGain
USER MANUAL
HLU-200 List 1D Line Unit for Litespan-2000 Channel Bank
Product Catalog: HLU-200-L1D
CLEI: SLILNS0A

Revision History of This Manual 150-200-114-03, Issue 03
ii November 22, 1996 HLU-200 List 1D
REVISION HISTORY OF THIS MANUAL
To order copies of this document, use document catalog number 150-200-114-03.
INSPECTING SHIPMENT
Upon receipt of the equipment:
•Unpack each container and 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 ADC DSL Systems,
Inc. 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 ADC DSL Systems, Inc. If you must store the equipment for a prolonged period, store
the equipment in its original container.
Issue Release Date Revisions Made
01 01/07/96 Initial release
02 11/22/96 Added Sections A3 and A4
03 03/08/02 ADC rebrand

150-200-114-03, Issue 03
HLU-200 List 1D November 22, 1996 1
Table of Contents
Product Overview........................................................................................................................................2
Description and Features..............................................................................................................2
Applications .................................................................................................................................3
Installation, Maintenance, and Provisioning................................................................................4
Maintenance.............................................................................................................6
Resource Usage........................................................................................................7
I/O Cabling...................................................................................................................................8
Functional Operation...................................................................................................................15
Alarms.........................................................................................................................................18
Options........................................................................................................................................19
Installation...................................................................................................................................21
Specifications ..............................................................................................................................23
Certification.................................................................................................................................23
Warranty......................................................................................................................................23
Technical Assistance...................................................................................................................24
Applications Without Using HiGain Doublers.........................................................................................24
General........................................................................................................................................24
Power Parameters........................................................................................................................24
Loopback Operation....................................................................................................................25
Testing.........................................................................................................................................26
Applications Using HiGain Doublers........................................................................................................27
General........................................................................................................................................27
Power Parameters........................................................................................................................27
Loopback Operation....................................................................................................................28
Testing.........................................................................................................................................29
Tables...........................................................................................................................................................31
System Maintenance Menu Screens..........................................................................................................46
Non-Doublers..............................................................................................................................46
Doublers......................................................................................................................................51
This product incorporates static sensitive components. Proper electrostatic
discharge procedures must be followed.

150-200-114-03, Issue 03
2 November 22, 1996 HLU-200 List 1D
Product Overview
Descriptions and Features
ADC’s HiGain Line Unit Model HLU-200 List 1D (AHT1U) shown in Figure 1, is an asynchronous DS1
interface unit that plugs into the Channel Bank Assembly (CBA) of a DSC Litespan-2000 optical loop carrier
system to provide an HDSL interface. The AHT1U is essentially an AT1U line unit with its T1 line interface
circuit replaced by an HDSL line interface circuit. When used in conjunction with an HRU-412 HiGain
Remote Unit, the system provides 1.544 Mbps transmission on two unconditioned copper pairs over the full
Carrier Serving Area (CSA) range. The CSA includes loops up to 12,000 feet of AWG 24 or 9,000 feet of
AWG 26 wire, including bridged taps. This CSA range can be doubled with an HDU doubler and tripled with
two doublers. The HiGain system uses HDSL (High-bit-rate Digital Subscriber Line) transmission technology
as recommended by Bellcore TA-TSY-001210. HiGain 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 200
L 1D
LOOP
FAIL
HDSL
R
S
2
3
2
1070
AHT1U
Figure 1. HLU-200 List 1D Front Panel.
The HLU-200 List 1D is compatible with the DSC Litespan-2000 Channel Bank version 7.1.x and 8.1.x
(originally 7.2.x).

150-200-114-03, Issue 03
HLU-200 List 1D November 22, 1996 3
HLU-200 List 1D features:
•RS-232 maintenance port
•Lightning and power cross protection on HDSL interfaces
•784 kbps full-duplex 2B1Q HDSL Transmission on two pairs
•Front panel status indicating LEDs
•Margin threshold alarm
•Upgradeable to HLU-200 List 2D (AHDSL) line unit
•Low power consumption
•Doubler compatible.
Applications
The HiGain system provides a cost-effective, easy-to-deploy method for delivering T1 High Capacity Digital
Service (HCDS) over metallic pairs. The fiber-like quality service is deployed over two unconditioned, non-
loaded copper pairs. Conventional inline T1 repeaters are not required. Cable pair conditioning, pair
separation and bridged tap removal are not required. See Figure 2 for typical HLU-200 applications.
General guidelines require that each HDSL loop have less than 35 dB of loss at 196 kHz, with 135 ohms
driving and terminating impedances and comply with CSA guidelines. The HiGain system operates with any
number of other T1, POTS, Digital Data Service (DDS), or other HiGain systems sharing the same cable binder
group. HiGain systems can be used for customers requiring DS1 service on a temporary or permanent basis.
The HiGain system also provides a means of quickly deploying service in advance of fiber-optic transmission
systems. With the HiGain system, service can be provided within hours. Fiber optic systems can be installed at
a leisurely pace and cut-over from the installed HiGain system when convenient to do so. The installed HiGain
system can then be easily removed and utilized elsewhere.
The HLU-200 operates as a channel card within a DSC Litespan-2000 Channel Bank. The Litespan-2000
system consists of a CO bank that is connected to a remote bank over an OC3 fiber link. Each bank has slots
for 56 channel plug-ins. The HLU-200 List 1D is typically installed in the remote bank where it is used to
transmit a T1 payload to a remote HRU-412 over two unconditioned HDSL cable pairs, with or without
doublers. It is the HDSL equivalent to an AT1U channel card, which is used to transmit a T1 payload to a
remote location over conventional T1 spans. The HLU-200 List 1D is compatible with software releases 7.1.x
and 8.1.x and above, of the Litespan-2000 system. The List 1D is not compatible with the Litespan-2000
Management System and must be maintained, provisioned, and monitored from its front panel RS-232 port.
The List 2D HLU-200 (AHDSL) line unit will provide integrated management and will be compatible with the
Litespan-2000 TL1-based Network Management System and the Litecraft Management System in version 8.1.
However, the List 1D has a spare Interface Control Processor (ICP) socket, see Figure 5. This holds the ICP
which is required for integrating the HLU-200 LIST 1D into the Litespan-2000 Management System. This
allows a List 1D unit to be returned to the factory for easy upgrading to the List 2D configuration. The HLU-
200's timing is not synchronized to the Litespan bank timing, but runs asynchronously with respect to it.
The HLU-200 can be cross-connected to another HLU-200 or another asynchronous T1 channel unit within its
own channel bank or in the distant channel bank. This is shown in Figure 2, where test access at either the
remote or local ends can be accomplished by use of ADS1U and AT1U line cards. These point-to-point
dedicated circuits are initiated by issuing the standard TL1-based cross-connect commands to the Maintenance
and Test Interface (MTI) card, which identifies the HLU-200 List 1D as an AHT1U plug. See Installation,
Maintenance, and Provisioning section for more details.

150-200-114-03, Issue 03
4 November 22, 1996 HLU-200 List 1D
Figure 2 shows both doubler and non-doubler applications. Circuit A is a non-doubler application. The HRU
can be placed up to 3000 feet into the network for extra range without doublers. This requires an external
Network Interface Device (NID) to be placed at the Network Interface (NI). The HRU must have its SmartJack
(LB) option set to DISABLE for these external NID applications. The option is set to ENABLE when the HRU
is located at the NI and performs the standard NID functions as in Circuit B and C. Circuit B is a single doubler
application. The HLU-200 List 1D powers both the HDU and HRU in circuits A and B. Circuit C is a two
doubler application. The HRU must be locally powered for all two doubler applications.
Local
Litespan
2000
CBA
Remote
2000
CBA
Litespan
HDU HDU
HDSL HDSL HDSL
HDSL HDSL
HDSL
HRU
local
power
HDU
HLU-200
HLU-200
HLU-200
Remote test access
AT1U
ADS1U HRU
HRU
NID
T1
CPE I
3000 ft max.
DSX
Local test access
T1
OC3
HLU-200 Application
1146
Circuit C
Circuit B
Circuit A
T1
T1
T1
T1
NI
AHT1U
AHT1U
AHT1U
Figure 2. HLU-200 List 1D Typical Applications
Installation, Maintenance, and Provisioning
TL1 is the native communication language of Litespan. Access to the Litespan system is achieved by directly
connecting an ASCII terminal, dial-up connection via a modem or an X.25 packet network to the RS-232
connector on either the front panel of the MTI board or to the Fuse and Alarm Panel. Refer to the TL1
Reference Practice, OSP-363-205-502, for details.
OMAPS is a user friendly software interface that provides provisioning and maintenance access to the Litespan-
2000 system. OMAPS is a program that runs on an IBM PC-AT2 or equivalent computer. Refer to the
OMAPS Reference Practice, OSP 363-205-501 for details.
The HLU-200 List 1D supports a limited number of the OMAPS functions that are fully supported by generic
Litespan plugs, such as the AT1U. The following paragraphs list these specific OMAPS functions which the
HLU-200 supports. Their equivalent TL1 commands can be found in the above mentioned TL1 practice. Each
specific command is given a DLP reference number. The DLP is a Detail Level Procedure that is found in the
DLP section of the Litespan-2000 OMAPS binder practice binder Series OSP 363-205-501. The DLP contains
detailed information about the command’s purpose, use and execution. The commands are listed in a sequence
that parallels the Main OMAPS Menu that appears in TAD (Task Analysis Data)-005 of the OMAPS practice.
Refer to this binder for more specific OMAPS information as needed.

150-200-114-03, Issue 03
HLU-200 List 1D November 22, 1996 5
Provisioning. Note that all of the HLU-200 List 1D specific user options can only be set from its front panel
RS-232 maintenance port. Only one of these options, the DS1 line code (B8ZS or AMI), is sent to the Litespan-
2000 system manager which reads the value and then provisions the Litespan Gate Array, shown in Figure 3,
accordingly. This HLU-200 List 1D line code setting is not available from OMAPS. It must be provisioned
and read from the RS-232 maintenance port mentioned above.
Channel Bank Slot Assignments.The HLU-200 List 1D supports the following Channel Bank Slot
Assignment commands. Note that the HLU-200 List 1D’s Equipment Type ID is AHT1U.
1. RETRIEVE CHANNEL UNIT SLOT ASSIGNMENTS (DLP-302)
This command retrieves and displays the following information:
a. Access Id. Defines the CBA and slot number, such as COT-1-45
b. Assigned Type. Type of channel unit assigned to the slot.
c. Equipped Type. Type of channel unit actually installed in the slot.
d. Service State. Current Service State of the specified channel unit. IS= in service, OOS= out
of service. Refer to TAD 004.
e. Status. Current status of the specified channel unit such as CROSS CONNECTED,
FAILURE, etc. refer to TAD 004.
2. EDIT CHANNEL UNIT SLOT ASSIGNMENTS (DLP-303)
This command allows channel units, which are not in the MT (Maintenance Test) state to be
placed IS (in service) or OOS (out of service). IS indicates the unit will carry traffic when
installed. OOS indicates the unit will not carry traffic when installed.
3. ENTER CHANNEL UNIT SLOT ASSIGNMENTS (DLP-304)
Use this command to assign a specific channel unit type to a specific slot. This affects the
Assigned Type field mentioned in 1 above. Note this command must be executed to properly
install the AHT1U into its assigned slot. The following is a step by step procedure to perform this
task:
a. Delete any previous channel slot assignments from the slot into which the AHT1U is to be
inserted. See step 4 below for the Delete command.
b. Insert the AHT1U into its slot. Notice that the red FAIL LED turns on and then off in a few
seconds.
c. Enter the AHT1U channel unit with this ENTER command.
4. DELETE CHANNEL UNIT SLOT ASSIGNMENTS (DLP-305)
Use this command to remove a slot’s previously assigned channel unit. This command should be
used to remove prior slot assignments from a slot that is to be assigned an AHT1U plug.

150-200-114-03, Issue 03
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Line Circuit Settings Option. The AHT1U supports the following Line Circuit Settings Option.
1. RETRIEVE LINE CIRCUIT SETTINGS (DLP-322)
This retrieves the following information on a slot occupied by an AHT1U:
a. Access Id. As above.
b. AIS. This entry determines the type of Alarm Indicating Signal (AIS) that is sent upstream of
the CBA when the AHT1U is in its alarm state. The choices are NONE, ALL 1s or ALL 0s.
c. Red Lined. A Yes or No indicating a circuit’s Red Lined status. A Red Lined circuit cannot
have its provisioning changed without first notifying the customer served by that circuit.
d. Cross Connection Type. Indicates that an AHT1U is cross connected to another T1 or DS1
line unit.
e. Service State. The service state (IS or OOS) of the unit.
f. Status. Indicates the status of the AHT1U: Cross Connected, OOS, MT etc.
The LINE CODE and GRADE of SERVICE settings that are supported by the AT1U
are NOT supported by the AHT1U.
2. EDIT T1U CIRCUIT SETTINGS (DLP-323)
This command allows the assigned AHT1U unit to have its AIS, Service State and Red Lined
states changed.
DS1 Cross-Connections. The AHT1U supports the following DS1 Cross-Connect commands:
1. RETRIEVE DS1 CROSS-CONNECTIONS (DLP-310)
This command allows the cross-connect status of an AHT1U to be determined.
2. PERFORM DS1 CROSS-CONNECTION (DLP-311)
This command allows an AHT1U to be cross-connected to another AHT1U, ADS1U, or AT1U
channel unit in either the same or another CBA.
The AHT1U can only be connected to another asynchronous card.
3. DISCONNECT DS1 CROSS-CONNECTION (DLP-312)
This command allows any cross-connected AHT1U to be disconnected.

150-200-114-03, Issue 03
HLU-200 List 1D November 22, 1996 7
Maintenance
Alarms. The AHT1U can generate two types of alarms toward the CBA. The first is caused by unplugging the
HLU card after it has been ENTERED. This generates a MJ (Major), SA (service affecting) Eqpt. alarm along
with the “UEQ-Unequipped”message. The second is caused by various alarms within the AHT1U circuit. See
the Alrams section of this manual for AHT1U Alarm details. Any of these HLU alarms cause an MJ, SA, T1
alarm with an “LOS: Loss of Signal”message. The AHT1U supports the following Alarm commands:
1. RETRIEVE STANDING ALARMS (DLP-504)
This command retrieves the following alarm status of an AHT1U
a. Access ID. As above.
b. Severity. Major only.
c. Service Affected. SA (service affecting) or NSA ( non service affecting). Both types of
AHT1U alarms are SA.
d. Type. Eqpt (AHT1U UEQ unit removal) or T1 (AHT1U LOS internal alarm).
e. Message. UEQ or LOS
2. RETRIEVE CONDITIONS (DLP-505)
This command retrieves the same information as the above Retrieve Standing Alarms command,
in addition to providing the Service State (IS, OOS or MT) of the AHT1U.
Performance Monitoring. The AHT1U does not support any of the main Litespan performance monitoring
functions. The AHT1U conducts its own performance monitoring. Access to this performance data is provided
by the AHT1U’s on-board maintenance program, which is accessible from its front panel RS-232 port. See the
System Maintenance Menu Screens section of this practice for more details.
Testing. The AHT1U does not support any of the Litespan initiated loopbacks. However, the AHT1U
maintains a family of loopbacks that can be initiated from its RS-232 front panel maintenance port and inband
codes. Although Figure 3 shows that metallic access to the HDSL loops is provided through the two narrow
band test loops on pins 35 through 38 under control of two test relays, this option is not supported by the
Litespan 7.1.x software. Enhanced versions of the Litespan software will support this test access. The AHT1U
supports the following Testing commands:
1. REMOVE FROM SERVICE (DLP-572)
This command allows an AHT1U that is In Service (IS) to be placed into its MT (Maintenance
Test) state for generic testing. While in this state, no AHT1U alarm states are recognized by the
CBA. The AHT1U can be replaced and intrusive tests can be performed without generating a
CBA alarm.
2. RESTORE TO SERVICE (DLP-573)
This command restores an AHT1U that is in its MT state to its IS state.

150-200-114-03, Issue 03
8 November 22, 1996 HLU-200 List 1D
Resource Usage
Plug-In Equipment Detail. The AHT1U supports the following Plug-In Equipment Inventory Detail command;
1. RETRIEVE PLUG-IN EQUIPMENT DETAIL (DLP-153)
This command retrieves the following plug-in data:
a. Access ID. As above
b. Serial #. This field is not supported by the AHT1U
c. CLEI Code. The AHT1U’s CLEI code is given as SLILNS0AAA.
d. H/W Version. The AHT1U has no hardware version. Therefore the AHT1U’s software
version instead is displayed in this field.
e. Boot Version. This is the version of the CBA Boot software.
f. S/W Version. This is the software (S/W) of the Litespan operating system.
Plug-In Equipment Summary. The AHT1U supports the following Plug-In Equipment Inventory Summary
command:
1. RETRIEVE PLUG-IN EQUIPMENT SUMMARY (DLP-154)
The AHT1U’s CLEI code field is listed. The AHT1U’s Equipment Description column displays
“Async HDSL T1 line Circuit”
Line Circuit Availability. The AHT1U supports the following Line Circuit Availability command:
1. RETRIEVE LINE CIRCUIT AVAILABILITY (DLP-158)
This command retrieves a list of the slots that are either equipped with a channel unit (occupied
slot) or Assigned (defined to accept a particular type of channel unit). For proper operation the
equipped unit type must be the same as the assigned unit type. See the Resource Usage section for
more information.
I/O Cabling
The HLU-200 HDSL Loop 1 and Loop 2 pairs are available at both the Narrowband and Wideband mass
connectors of the DSC shelf it occupies. Table 1 shows the generic Loop to three (A, B, and C) DIN Connector
row assignments (Figure 6).
Providing this dual connector access to each HDSL cable pair makes it
absolutely imperative that no connection be made to the connector that is Not
used.
Table 2 lists the Wideband cabling details for the Litespan-2000 CBA shelf. The J1 through J6 cables are
normally used to access the two I/O ports (IN and OUT) from slots that contain standard T1 channel units.
Column 1 lists the color code ID of each pair. Columns 2 and 3 list the pin numbers of either the 710 or AMP
cables that are provided by the CBA. The odd numbered cable columns (J1,3 and 5) list the Slot #/HDSL Loop
2 assignments. The even numbered cable columns (J2,4 and 6) list the Slot #/HDSL Loop 1 assignments. The
Pr. columns list the pairs in sequential order from 1 to 116 with pairs 97 through 100 having no connection
(NC). These pair numbers can be used by LFACS or other automatic circuit assignment programs.
Narrowband cables (P1 through P9 in Table 3) are normally used to access the four I/O ports from various DS0
channel units. When more than 1 CBA shelf is associated with a common control assembly (nine maximum),
both even and odd CBA shelves must be used. The odd shelves (1,3,5, and 7) have slightly different
Narrowband I/O cable assignments than the even shelves. This is done to facilitate LFACS pair assignment

150-200-114-03, Issue 03
HLU-200 List 1D November 22, 1996 9
with minimum loss of cable pairs. In an Odd bank the last Narrowband cable pair (# 225) is not available. In
an Even bank the first Narrowband cable pair (# 226) is not available. Table 3 lists the Narrowband cabling
details for the Odd Litespan-2000 CBA shelves. HDSL Loop 1 (L1) is assigned to the conventional Circuit 1 of
each slot and is shown in the Slot/circuit column as X-L1. HDSL Loop 2 (L2) is assigned to the conventional
Circuit 2 of each slot and is shown in the Slot/circuit column as X-L2. Where X= Slot #. The HLU-200 has no
connection to the narrowband ports normally assigned to Circuits 3 and 4 of each narrowband cable. Table 4
lists the corresponding Narrowband cabling details for the Even Litespan-2000 CBA shelves.
The HLU is compatible with the DSC 24 slot Optical Network Unit 96 (ONU-96) Starspan card cage assembly.
Table 5 lists the Wideband cabling/HDSL loop assignment details and Table 6 lists the Narrowband cabling
details for this ONU-96 system.
The HLU is also compatible with the DSC, 12 slot, Optical Network Unit 48 (ONU-48) Starspan card cage
assembly. Table 7 lists both the Wideband and Narrowband cabling/HDSL loop assignment details for this
ONU-48 system.
Table 1. Wideband and Narrowband HDSL Loop Cable Assignment
HLU-200 Slot Connector (P1) Pin
Assignments Pin Number Function Wideband Cabling Narrowband Cabling
3 (A3) and 71 (C7) HDSL Loop1 - Tip OUT Pair Circuit 1
4 (A4) and 72 (C8) HDSL Loop1 - Ring
5 (A5) and 73 (C9) HDSL Loop2 - Tip IN Pair Circuit 2
6 (A6) and 74 (C10) HDSL Loop2 - Ring

150-200-114-03, Issue 03
10 November 22, 1996 HLU-200 List 1D
Table 2. CBA Wideband Cabling/HDSL Loop Assignments
Color Code (Base/Ink) Pin # (T - R) J1 J2 J3 J4 J5 J6
Tip - Ring 710 or 3M AMP Slot - Pair Pr. Slot - Pair Pr. Slot - Pair Pr. Slot - Pair Pr. Slot - Pair Pr. Slot - Pair Pr. Wh/Bl - Bl/Wh 1 - 2 26 - 1 1 - L2 1 1 - L1 21 21 - L2 41 21 - L1 61 41 - L2 81 41 - L1 101 Wh/Or - Or/Wh 3 - 4 27 - 2 2 - L2 2 2 - L1 22 22 - L2 42 22 - L1 62 42 - L2 82 42 - L1 102 Wh/Gr - Gr/Wh 5 - 6 28 - 3 3 - L2 3 3 - L1 23 23 - L2 43 23 - L1 63 43 - L2 83 43 - L1 103 Wh/Br - Br/Wh 7 - 8 29 - 4 4 - L2 4 4 - L1 24 24 - L2 44 24 - L1 64 44 - L2 84 44 - L1 104 Wh/Sl - Sl/Wh 9 - 10 30 - 5 5 - L2 5 5 - L1 25 25 - L2 45 25 - L1 65 45 - L2 85 45 - L1 105 Rd/Bl - Bl/Rd 11 - 12 31 - 6 6 - L2 6 6 - L1 26 26 - L2 46 26 - L1 66 46 - L2 86 46 - L1 106 Rd/Or - Or/Rd 13 - 14 32 - 7 7 - L2 7 7 - L1 27 27 - L2 47 27 - L1 67 47 - L2 87 47 - L1 107 Rd/Gr - Gr/Rd 15 - 16 33 - 8 8 - L2 8 8 - L1 28 28 - L2 48 28 - L1 68 48 - L2 88 48 - L1 108 Rd/Br - Br/Rd 17 - 18 34 - 9 9 - L2 9 9 - L1 29 29 - L2 49 29 - L1 69 49 - L2 89 49 - L1 109 Rd/Sl - Sl/Rd 19 - 20 35 - 10 10 - L2 10 10 - L1 30 30 - L2 50 30 - L1 70 50 - L2 90 50 - L1 110 Bk/Bl - Bl/Bk 21 - 22 36 - 11 11 - L2 11 11 - L1 31 31 - L2 51 31 - L1 71 51 - L2 91 51 - L1 111 Bk/Or - Or/Bk 23 - 24 37 - 12 12 - L2 12 12 - L1 32 32 - L2 52 32 - L1 72 52 - L2 92 52 - L1 112 Bk/Gr - Gr/Bk 25 - 26 38 - 13 13 - L2 13 13 - L1 33 33 - L2 53 33 - L1 73 53 - L2 93 53 - L1 113 Bk/Br - Br/Bk 27 - 28 39 - 14 14 - L2 14 14 - L1 34 34 - L2 54 34 - L1 74 54 - L2 94 54 - L1 114 Bk/Sl - Sl/Bk 29 - 30 40 - 15 15 - L2 15 15 - L1 35 35 - L2 55 35 - L1 75 55 - L2 95 55 - L1 115 Yl/Bl - Bl/Yl 31 - 32 41 - 16 16 - L2 16 16 - L1 36 36 - L2 56 36 - L1 76 56 - L2 96 56 - L1 116 Yl/Or - Or/Yl 33 - 34 42 - 17 17 - L2 17 17 - L1 37 37 - L2 57 37 - L1 77 N/C 97 N/C 117 Yl/Gr - Gr/Yl 35 - 36 43 - 18 18 - L2 18 18 - L1 38 38 - L2 58 38 - L1 78 N/C 98 N/C 118 Yl/Br - Br/Yl 37 - 38 44 - 19 19 - L2 19 19 - L1 39 39 - L2 59 39 - L1 79 N/C 99 N/C 119 Yl/Sl - Sl/Yl 39 - 40 45 - 20 20 - L2 20 20 - L1 40 40 - L2 60 40 - L1 80 N/C 100 N/C 120 Vi/Bl - Bl/Vi 41 - 42 46 - 21 Vi/Or - Or/Vi 43 - 44 47 - 22 Vi/Gr - Gr/Vi 45 - 46 48 - 23 Spares Tied Off Vi/Br - Br/Vi 47 - 48 49 - 24 Vi/Sl 49 50 Sl/Vi N/C N/C Drain Wire 50 25 Frame Ground L1 = HDSL Loop 1, L2 = HDSL Loop 2

150-200-114-03, Issue 03 HLU-200 List 1D November 22, 1996 11
Table 3. Odd CBA Narrowband Cabling (Last Pair Unassigned)/HDSL Loop Assignments
Color Code
(Base/Ink) Pin # (T - R) P1 P2 P3 P4 P5 P6 P7 P8 P9
Tip - Ring 710 or
3M AMP Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr.
Wh/Bl - Bl/Wh 1 - 2 26 - 1 1 - L1 1 7 - L2 26 26 - L1 101 32 - L2 126 51 - L1 201 Wh/Or - Or/Wh 3 - 4 27 - 2 1 - L2 2 20 - L1 77 26 - L2 102 45 - L1 177 51 - L2 202 Wh/Gr - Gr/Wh 5 - 6 28 - 3 14 - L1 53 20 - L2 78 39 - L1 153 45 - L2 178 Wh/Br - Br/Wh 7 - 8 29 - 4 8 - L1 29 14 - L2 54 33 - L1 129 39 - L2 154 Wh/Sl - Sl/Wh 9 - 10 30 - 5 2 - L1 5 8 - L2 30 27 - L1 105 33 - L2 130 52 - L1 205 Rd/Bl - Bl/Rd 11 - 12 31 - 6 2 - L2 6 21 - L1 81 27 - L2 106 46 - L1 181 52 - L2 206 Rd/Or - Or/Rd 13 - 14 32 - 7 15 - L1 57 21 - L2 82 40 - L1 157 46 - L2 182 Rd/Gr - Gr/Rd 15 - 16 33 - 8 9 - L1 33 15 - L2 58 34 - L1 133 40 - L2 158 Rd/Br - Br/Rd 17 - 18 34 - 9 3 - L1 9 9 - L2 34 28 - L1 109 34 - L2 134 53 - L1 209 Rd/Sl - Sl/Rd 19 - 20 35 - 10 3 - L2 10 22 - L1 85 28 - L2 110 47 - L1 185 53 - L2 210 Bk/Bl - Bl/Bk 21 - 22 36 - 11 16 - L1 61 22 - L2 86 41 - L1 161 47 - L2 186 Bk/Or - Or/Bk 23 - 24 37 - 12 10 - L1 37 16 - L2 62 35 - L1 137 41 - L2 162 Bk/Gr - Gr/Bk 25 - 26 38 - 13 4 - L1 13 10 - L2 38 29 - L1 113 35 - L2 138 54 - L1 213 Bk/Br - Br/Bk 27 - 28 39 - 14 4 - L2 14 23 - L1 89 29 - L2 114 48 - L1 189 54 - L2 214 Bk/Sl - Sl/Bk 29 - 30 40 - 15 17 - L1 65 23 - L2 90 42 - L1 165 48 - L2 190 Yl/Bl - Bl/Yl 31 - 32 41 - 16 11 - L1 41 17 - L2 66 36 - L1 141 42 - L2 166 Yl/Or - Or/Yl 33 - 34 42 - 17 5 - L1 17 11 - L2 42 30 - L1 117 36 - L2 142 55 - L1 217 Yl/Gr - Gr/Yl 35 - 36 43 - 18 5 - L2 18 24 - L1 93 30 - L2 118 49 - L1 193 55 - L2 218 Yl/Br - Br/Yl 37 - 38 44 - 19 18 - L1 69 24 - L2 94 43 - L1 169 49 - L2 194 Yl/Sl - Sl/Yl 39 - 40 45 - 20 12 - L1 45 18 - L2 70 37 - L1 145 43 - L2 170 Vi/Bl - Bl/Vi 41 - 42 46 - 21 6 - L1 21 12 - L2 46 31 - L1 121 37 - L2 146 56 - L1 221 Vi/Or - Or/Vi 43 - 44 47 - 22 6 - L2 22 25 - L1 97 31 - L2 122 50 - L1 197 56 - L2 222 Vi/Gr - Gr/Vi 45 - 46 48 - 23 19 - L1 73 25 - L2 98 44 - L1 173 50 - L2 198 Vi/Br - Br/Vi 47 - 48 49 - 24 13 - L1 49 19 - L2 74 38 - L1 149 44 - L2 174 Vi/Sl - Sl/Vi 49 - 50 50 - 25 7 - L1 25 13 - L2 50 32 - L1 125 38 - L2 150 dead 225 L1 = HDSL Loop 1, L2 = HDSL Loop 2

150-200-114-03, Issue 03
12 November 22, 1996 HLU-200 List 1D
Table 4. Even CBA Narrowband Cabling (First Pair Unassigned)/HDSL Loop Assignments)
Color Code
(Base/Ink) Pin # (T - R) P1 P2 P3 P4 P5 P6 P7 P8 P9
Tip - Ring 710 or
3M AMP Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr. Slot -
Loop Pr.
Wh/Bl - Bl/Wh 1 - 2 26 - 1 dead 226 7 - L1 251 13 - L2 276 32 - L1 351 38 - L2 376 Wh/Or - Or/Wh 3 - 4 27 - 2 1 - L1 227 7 - L2 252 26 - L1 327 32 - L2 352 51 - L1 427 Wh/Gr - Gr/Wh 5 - 6 28 - 3 1 - L2 228 20 - L1 303 26 - L2 328 45 - L1 403 51 - L2 428 Wh/Br - Br/Wh 7 - 8 29 - 4 14 - L1 279 20 - L2 304 39 - L1 379 45 - L2 404 Wh/Sl - Sl/Wh 9 - 10 30 - 5 8 - L1 255 14 - L2 280 33 - L1 355 39 - L2 380 Rd/Bl - Bl/Rd 11 - 12 31 - 6 2 - L1 231 8 - L2 256 27 - L1 331 33 - L2 356 52 - L1 431 Rd/Or - Or/Rd 13 - 14 32 - 7 2 - L2 232 21 - L1 307 27 - L2 332 46 - L1 407 52 - L2 432 Rd/Gr - Gr/Rd 15 - 16 33 - 8 15 - L1 283 21 - L2 308 40 - L1 383 46 - L2 408 Rd/Br - Br/Rd 17 - 18 34 - 9 9 - L1 259 15 - L2 284 34 - L1 359 40 - L2 384 Rd/Sl - Sl/Rd 19 - 20 35 - 10 3 - L1 235 9 - L2 260 28 - L1 335 34 - L2 360 53 - L1 435 Bk/Bl - Bl/Bk 21 - 22 36 - 11 3 - L2 236 22 - L1 311 28 - L2 336 47 - L1 411 53 - L2 436 Bk/Or - Or/Bk 23 - 24 37 - 12 16 - L1 287 22 - L2 312 41 - L1 387 47 - L2 412 Bk/Gr - Gr/Bk 25 - 26 38 - 13 10 - L1 263 16 - L2 288 35 - L1 363 41 - L2 388 Bk/Br - Br/Bk 27 - 28 39 - 14 4 - L1 239 10 - L2 264 29 - L1 339 35 - L2 364 54 - L1 439 Bk/Sl - Sl/Bk 29 - 30 40 - 15 4 - L2 240 23 - L1 315 29 - L2 340 48 - L1 415 54 - L2 440 Yl/Bl - Bl/Yl 31 - 32 41 - 16 17 - L1 291 23 - L2 316 42 - L1 391 48 - L2 416 Yl/Or - Or/Yl 33 - 34 42 - 17 11 - L1 267 17 - L2 292 36 - L1 367 42 - L2 392 Yl/Gr - Gr/Yl 35 - 36 43 - 18 5 - L1 243 11 - L2 268 30 - L1 343 36 - L2 368 55 - L1 443 Yl/Br - Br/Yl 37 - 38 44 - 19 5 - L2 244 24 - L1 319 30 - L2 344 49 - L1 419 55 - L2 444 Yl/Sl - Sl/Yl 39 - 40 45 - 20 18 - L1 295 24 - L2 320 43 - L1 395 49 - L2 420 Vi/Bl - Bl/Vi 41 - 42 46 - 21 12 - L1 271 18 - L2 296 37 - L1 371 43 - L2 396 Vi/Or - Or/Vi 43 - 44 47 - 22 6 - L1 247 12 - L2 272 31 - L1 347 37 - L2 372 56 - L1 447 Vi/Gr - Gr/Vi 45 - 46 48 - 23 6 - L2 248 25 - L1 323 31 - L2 348 50 - L1 423 56 - L2 448 Vi/Br - Br/Vi 47 - 48 49 - 24 19 - L1 299 25 - L2 324 44 - L1 399 50 - L2 424 Vi/Sl - Sl/Vi 49 - 50 50 - 25 13 - L1 275 19 - L2 300 38 - L1 375 44 - L2 400 L1 = HDSL Loop 1, L2 = HDSL Loop 2

150-200-114-03, Issue 03
HLU-200 List 1D November 22, 1996 13
Table 5. ONU-96 Wideband Cabling/HDSL Loop Assignments
Color Code
(Base/Ink) Pin # (T - R) J1 J2 J3 J4
Tip - Ring 710 or
3M AMP Slot - Pair Pr. Slot - Pair Pr. Slot - Pair Pr. Slot - Pair Pr.
Wh/Bl - Bl/Wh 1 - 2 26 - 1 N/C 1 N/C 26 N/C 51 N/C 76
Wh/Or - Or/Wh 3 - 4 27 - 2 N/C 2 N/C 27 N/C 52 N/C 77
Wh/Gr - Gr/Wh 5 - 6 28 - 3 1 - L1 3 7 - L1 28 13 - L1 53 19 - L1 78
Wh/Br - Br/Wh 7 - 8 29 - 4 1 - L2 4 7 - L2 29 13 - L2 54 19 - L2 79
Wh/Sl - Sl/Wh 9 - 10 30 - 5 N/C 5 N/C 30 N/C 55 N/C 80
Rd/Bl - Bl/Rd 11 - 12 31 - 6 N/C 6 N/C 31 N/C 56 N/C 81
Rd/Or - Or/Rd 13 - 14 32 - 7 2 - L1 7 8 - L1 32 14 - L1 57 20 - L1 82
Rd/Gr - Gr/Rd 15 - 16 33 - 8 2 - L2 8 8 - L2 33 14 - L2 58 20 - L2 83
Rd/Br - Br/Rd 17 - 18 34 - 9 N/C 9 N/C 34 N/C 59 N/C 84
Rd/Sl - Sl/Rd 19 - 20 35 - 10 N/C 10 N/C 35 N/C 60 N/C 85
Bk/Bl - Bl/Bk 21 - 22 36 - 11 3 - L1 11 9 - L1 36 15 - L1 61 21 - L1 86
Bk/Or - Or/Bk 23 - 24 37 - 12 3 - L2 12 9 - L2 37 15 - L2 62 21 - L2 87
Bk/Gr - Gr/Bk 25 - 26 38 - 13 N/C 13 N/C 38 N/C 63 N/C 88
Bk/Br - Br/Bk 27 - 28 39 - 14 N/C 14 N/C 39 N/C 64 N/C 89
Bk/Sl - Sl/Bk 29 - 30 40 - 15 4 - L1 15 10 - L1 40 16 - L1 65 22 - L1 90
Yl/Bl - Bl/Yl 31 - 32 41 - 16 4 - L2 16 10 - L2 41 16 - L2 66 22 - L2 91
Yl/Or - Or/Yl 33 - 34 42 - 17 N/C 17 N/C 42 N/C 67 N/C 92
Yl/Gr - Gr/Yl 35 - 36 43 - 18 N/C 18 N/C 43 N/C 68 N/C 93
Yl/Br - Br/Yl 37 - 38 44 - 19 5 - L1 19 11 - L1 44 17 - L1 69 23 - L1 94
Yl/Sl - Sl/Yl 39 - 40 45 - 20 5 - L2 20 11 - L2 45 17 - L2 70 23 - L2 95
Vi/Bl - Bl/Vi 41 - 42 46 - 21 N/C 21 N/C 46 N/C 71 N/C 96
Vi/Or - Or/Vi 43 - 44 47 - 22 N/C 22 N/C 47 N/C 72 N/C 97
Vi/Gr - Gr/Vi 45 - 46 48 - 23 6 - L1 23 12 - L1 48 18 - L1 73 24 - L1 98
Vi/Br - Br/Vi 47 - 48 49 - 24 6 - L2 24 12 - L2 49 18 - L2 74 24 - L2 99
Vi/Sl - Sl/Vi 49 - 50 50 - 25 N/C
Drain 25 N/C Drain 50 N/C Drain 75 N/C Drain 100
L1 = HDSL Loop 1, L2 = HDSL Loop 2

150-200-114-03, Issue 03
14 November 22, 1996 HLU-200 List 1D
Table 6. ONU-96 Narrowband Cabling/HDSL Loop Assignments
Color Code
(Base/Ink) Pin # (T - R) P1 P2 P3 P4
Tip - Ring 710 or
3M AMP Slot - Circuit Pr. Slot - Circuit Pr. Slot - Circuit Pr. Slot - Circuit Pr.
Wh/Bl - Bl/Wh 1 - 2 26 - 1 1 - L1 1 7 - L2 26
Wh/Or - Or/Wh 3 - 4 27 - 2 1 - L2 2 20 - L1 77
Wh/Gr - Gr/Wh 5 - 6 28 - 3 14 - L1 53 20 - L2 78
Wh/Br - Br/Wh 7 - 8 29 - 4 8 - L1 29 14 - L2 54
Wh/Sl - Sl/Wh 9 - 10 30 - 5 2 - L1 5 8 - L2 30
Rd/Bl - Bl/Rd 11 - 12 31 - 6 2 - L2 6 21 - L1 81
Rd/Or - Or/Rd 13 - 14 32 - 7 15 - L1 57 21 - L2 82
Rd/Gr - Gr/Rd 15 - 16 33 - 8 9 - L1 33 15 - L2 58
Rd/Br - Br/Rd 17 - 18 34 - 9 3 - L1 9 9 - L2 34
Rd/Sl - Sl/Rd 19 - 20 35 - 10 3 - L2 10 22 - L1 85
Bk/Bl - Bl/Bk 21 - 22 36 - 11 16 - L1 61 22 - L2 86
Bk/Or - Or/Bk 23 - 24 37 - 12 10 - L1 37 16 - L2 62
Bk/Gr - Gr/Bk 25 - 26 38 - 13 4 - L1 13 10 - L2 38
Bk/Br - Br/Bk 27 - 28 39 - 14 4 - L2 14 23 - L1 89
Bk/Sl - Sl/Bk 29 - 30 40 - 15 17 - L1 65 23 - L2 90
Yl/Bl - Bl/Yl 31 - 32 41 - 16 11 - L1 41 17 - L2 66
Yl/Or - Or/Yl 33 - 34 42 - 17 5 - L1 17 11 - L2 42
Yl/Gr - Gr/Yl 35 - 36 43 - 18 5 - L2 18 24 - L1 93
Yl/Br - Br/Yl 37 - 38 44 - 19 18 - L1 69 24 - L2 94
Yl/Sl - Sl/Yl 39 - 40 45 - 20 12 - L1 45 18 - L2 70
Vi/Bl - Bl/Vi 41 - 42 46 - 21 6 - L1 21 12 - L2 46
Vi/Or - Or/Vi 43 - 44 47 - 22 6 - L2 22 97
Vi/Gr - Gr/Vi 45 - 46 48 - 23 19 - L1 73 N/C 98
Vi/Br - Br/Vi 47 - 48 49 - 24 13 - L1 49 19 - L2 74 99
Vi/Sl - Sl/Vi 49 - 50 50 - 25 7 - L1 25 13 - L2 50 100
L1 = HDSL Loop 1, L2 = HDSL Loop 2

150-200-114-03, Issue 03
HLU-200 List 1D November 22, 1996 15
Table 7. ONU-48 Narrowband and Wideband Cabling/HDSL Loop Assignments
Color Code
(Base/Ink) Pin # (T - R) P1 P2 J1 J2
Tip - Ring 710 or
3M Slot - Circuit Pr. Slot - Circuit Pr .Slot - Pair Pr .Slot - Pair Pr.
Wh/Bl - Bl/Wh 1 - 2 1 - L1 1 7 - L1 26 1 - L1 1 26
Wh/Or - Or/Wh 3 - 4 1 - L2 2 7 - L2 27 1 - L2 2 27
Wh/Gr - Gr/Wh 5 - 6 2 - L1 3 8 - L1 28
Wh/Br - Br/Wh 7 - 8 2 - L2 4 8 - L2 29
Wh/Sl - Sl/Wh 9 - 10 2 - L1 5 8 - L1 30 3 - L1 5 9 - L1 30
Rd/Bl - Bl/Rd 11 - 12 2 - L2 6 8 - L2 31 3 - L2 6 9 - L2 31
Rd/Or - Or/Rd 13 - 14 4 - L1 7 10 - L1 32
Rd/Gr - Gr/Rd 15 - 16 4 - L2 8 10 - L2 33
Rd/Br - Br/Rd 17 - 18 3 - L1 9 9 - L1 34 5 - L1 9 11 - L1 34
Rd/Sl - Sl/Rd 19 - 20 3 - L2 10 9 - L2 35 5 - L2 10 11 - L2 35
Bk/Bl - Bl/Bk 21 - 22 6 - L1 11 12 - L1 36
Bk/Or - Or/Bk 23 - 24 6 - L2 12 12 - L2 37
Bk/Gr - Gr/Bk 25 - 26 4 - L1 13 10 - L1 38 N/C 13 N/C 38
Bk/Br - Br/Bk 27 - 28 4 - L2 14 10 - L2 39 N/C 14 N/C 39
Bk/Sl - Sl/Bk 29 - 30 N/C 15 N/C 40
Yl/Bl - Bl/Yl 31 - 32 N/C 16 N/C 41
Yl/Or - Or/Yl 33 - 34 5 - L1 17 11 - L1 42 N/C 17 N/C 42
Yl/Gr - Gr/Yl 35 - 36 5 - L2 18 11 - L2 43 N/C 18 N/C 43
Yl/Br - Br/Yl 37 - 38 N/C 19 N/C 44
Yl/Sl - Sl/Yl 39 - 40 N/C 20 N/C 45
Vi/Bl - Bl/Vi 41 - 42 6 - L1 21 12 - L1 46 N/C 21 N/C 46
Vi/Or - Or/Vi 43 - 44 6 - L2 22 12 - L2 47 N/C 22 N/C 47
Vi/Gr - Gr/Vi 45 - 46 N/C 23 N/C 48
Vi/Br - Br/Vi 47 - 48 N/C 24 N/C 49
Vi/Sl - Sl/Vi 49 - 50 N/C 25 N/C 50 N/C
Drain 25 N/C Drain 50
L1 = HDSL Loop 1, L2 = HDSL Loop 2
Functional Operation
The HiGain system uses ADC 2-Bit 1-Quartenary (2B1Q) HDSL transceiver systems to establish two full-
duplex 784 kbps data channels between the HLU-200 List 1D and a HRU-412 HiGain Remote Unit. This
provides a total capacity of 1.568 Mbps between the two units.
A block diagram of the HLU-200 List 1D is shown in Figure 3. The Litespan gate array circuit controls the
exchange of the 1.544 Mbps data payload between the backplane and the 2180 T1 framer. The 2180 processes
the T1 data and reorganizes Super Frame (SF) or Extended Super Frame (ESF) format. It also performs

150-200-114-03, Issue 03
16 November 22, 1996 HLU-200 List 1D
Alternate Mark Inversion (AMI) and Bipolar 8 Bit Substitution (B8ZS) coding and decoding and hands the T1
payload off to the HDSL framer.
The HLU-200 List 1D has a socket for the Interface Control Processor (ICP) which integrates the HLU-200’s
Management System into the Litespan CBA Management System. Factory upgrades allow the HLU-200 List
1D to be upgraded to an AHDSL List 2D unit by adding the ICP.
The header port J1 is used to download the boot loader to the Litespan microprocessor during factory testing.
This provisions the microprocessor to communicate to the CBA and allows it to be recognized and initialized
by the bank’s common control equipment.
The HLU-200 List 1D microprocessor also conveys its line code format (AMI/B8ZS) and Alarm Status to the
Litespan microprocessor over two direct data lines between the two chips.
The TEST LOOP feature which controls the metallic test access to the two facility cable pairs is not supported
by release 7.1.x but will be supported by 8.1.x.
18,20,21,23,24,28,50,
52,53,55,56,60,82,84
85,87
19,22,46,51,54,83,86
Gate array
Microprocessor
ICP
for List 2D
upgrade
FAIL
Litespan circuit
HLU-200
microprocessor
AMI
Alarm
Serial
I/O RS-232
port
Test Loops
"2180"
T1
Framer
HDSL
Framer
HDSL LOOP
Power
supply
-5V
17,49,81
Litespan
backplane
J1
boot
loaded
header
(factory use only)
Fuse
1/2A
SW BAT (-48V)
SW ground
14
2,34,66 Frame ground
32,64,96 +5V
HDSL
Loop 1
XCVR
HDSL
Loop 2
XCVR
Burn in
130V
or
200V
power
supply
-130V (-200V)
0V (0V)
-65V (-100V)
+65V (+100V)
Unipolar Bipolar
S2
T2
R2
3,71
6,74
4,72
5,73
TEST R
T1
R1
TEST R1
Test Loop 1
(narrow band)
Loop 1 (Out)
Loop 2 (In)
Test Loop 2
(narrow band)
TEST T
TEST T1
36
35
38
37
Loop 1 test relay
Loop 2 test relay
1148
11
Surge ground
33
Figure 3. HLU-200 List 1D Block Diagram.
The HLU-200 List 1D contains an HDSL framer that generates two parallel 784 kbps data streams. The data
streams contain 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 DS1 payload. The DS1 stream is separated into two parallel streams that comprise the payloads of the 2
HDSL loops. The HLU-200 List 1D allocates the DS0 time slots according to the version of HRU-412 to
which it is connected. Legacy HRUs require the odd DS0 time slots allocated to loop 1 and the even DS0 time
slots to loop 2. Newer versions allocate DS0 time slots 1 through 12 to loop 1, and time slots 13 through 24 to
loop 2. The 8 kbps frame bits of the DS1 stream are included on both HDSL channels. The two formatted
HDSL channels are passed to the HDSL transceivers, which convert them to 2B1Q format for application to the
HDSL lines. The 2B1Q line code is designed to operate in a full duplex mode on unconditioned pairs. The
transceiver echo canceller and adaptive equalizer receive the signal from the remote end in the presence of
impairments and noise on the copper pairs.
The received HDSL data is processed by the transceivers and then passed on to the HLU-200 framer module.
The framer provides frame synchronization for each of the two HDSL loops. The framer and HDSL
transceivers work under control of the HLU-200 microprocessor and compensate for data inversions caused by

150-200-114-03, Issue 03
HLU-200 List 1D November 22, 1996 17
tip-ring reversals and for loop swaps caused by pair reversals. The HiGain system allows for tip-ring or pair
reversals, but does not tolerate split pairs. By synchronizing to the Frame Sync Word (FSW) of each loop, the
framer can reconstruct the original 1.544 Mbps DS1 stream from the payloads of the two HDSL loops. The
CRC fields on the HDSL streams allow the HLU-200 List 1D to determine if errors are present on the loop due
to excessive impairments on the HDSL pairs, or due to excessive impulse or crosstalk noise.
The framer removes data link messages from the HDSL loops and passes them to the microprocessor. This
mechanism allows operations messages and status to be exchanged between the HLU-200and the HRU-412
remote unit.
The reconstructed HDSL data is buffered in a first-in-first-out (FIFO) buffer within the framer. A frequency
synthesizer in conjunction with the FIFO regulates the output bit rate and reconstructs the DS1 clock at the
exact rate received from the remote end. The HiGain system operates at DS1 rates of 1.544 Mbps with up to
±200 bps of offset.
The HLU-200 List 1D line power supply converts the -48 Vdc battery to a -130 Vdc (-200 Vdc for doublers)
which provides simplex power feed on the two HDSL line interfaces.
A female 9-pin, DB-9 RS-232, is provided on the front panel connector (see Figure 4). This connector provides
asynchronous access to the HiGain system maintenance, provisioning and performance monitoring firmware.
The port is configured as DCE with 8 data bits, 1 stop bit and no parity. Operator interaction with the firmware
is from an ASCII terminal or a personal computer with asynchronous communication software. Pressing the
spacebar several times enables the HLU-200 to automatically match the terminal line baud rate, from 1200
baud to 9600 baud. Figures 9 through 16 show the menu selections available from the terminal. Table 17
defines the status menu terms. Table 18 defines the glossary of HiGain terms used in the System Status Screen.
Terminal
HLU
Terminal
DB9
DB25
Male
TD (Transmit Data)
RD (Receive Data)
GND
Female
DCE
DTE
DTE
DB9
Figure 4. DB-9 RS-232 I/O Pinouts.
Alarms
The following alarms are detected and reported to the Litespan microprocessor via the Alarm signal from the
HLU microprocessor to the Litespan processor as shown in Figure 3. They also cause the HDSL LED to flash
red.
1. ALRM LOSW: Either of the HDSL loops lost sync
2. ALRM RLOS: Loss of HRU DS1 input signal

150-200-114-03, Issue 03
18 November 22, 1996 HLU-200 List 1D
3. ALRM TLOS: A user option that causes the loss of the HRU DS1 input from the CI to initiate a
logic loopback state in the HRU.
4. ALRM H1ES: HDSL loop 1 has exceeded the 24-hour user-selected Errored Seconds CRC
threshold.
5. ALRM H2ES: HDSL loop 2 has exceeded the 24-hour user-selected Errored Seconds CRC
threshold.
6. ALRM DS1: The total number of bipolar violations (BPV), at the HRU DS1 input, has exceeded
the 24-hour user-selected threshold.
7. ALRM MAL1: The margin on HDSL loop 1 has dropped below the minimum threshold value
set at the maintenance terminal Margin Alarm Threshold option.
8. ALRM MAL2: The margin on HDSL loop 2 has dropped below the minimum threshold value
set at the maintenance terminal Margin Alarm Threshold option.
The Alarm signal between the processors can be enabled or disabled by the user
Alarm option described in Table 10.
The factory default setting of the ALARM option is ENABLED.
Disabling the alarm signal between the processors has no effect on the HDSL
Alarm LED. It will always flash Red to indicate an HLU alarm condition.
Whenever the Alarm signal is asserted, the major alarm LED on the ACU card lights RED and remains on until
the alarm condition clears. In addition, the following message is issued to the MIF terminal when this alarm
occurs: “COT X-Y; MJ, LOS, ...”
The following MTI message occurs when the alarm clears:
“COT X-Y; CL: LOS, ...”
where X-Y is the SHELF-SLOT CBA location of the HLU 200 List 1D plug.
The three HLU-200 List 1D front panel LEDs function as follows:
•LOOP -This is a GREEN LED that lights whenever any of the HLU-200 List 1D system
loopbacks are in effect, see Loopback Operation in the Applications Without Using HiGain
Doublers section.
•FAIL - This is a RED LED that is controlled by the bank. This LED remains lit at all times when
the HLU-200 is used with revision 7.1.1 banks due to a software flaw in 7.1.1. When used with
revision 7.1.2 and higher versions, it lights when the HLU-200 is first plugged into the bank and
remains lit until the bank has finished its program download and handshake with the HLU-200. It
also lights whenever there is a service-affecting failure within the bank.
•HDSL - This is a tri-colored LED that:
–Flashes GREEN during HDSL sync acquisition on either HDSL loop.
–Flashes RED for any of the alarm conditions described above.
–Is steady GREEN when both HDSL loops are in sync and no minor alarms exist.
–Is steady RED if the onboard 48V fuse opens.