ADC HiGain HDU-404 LIST 2 Original operating instructions

HiGain
HiGain
FCC Class A Compliance
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Limited Warranty
Product warranty is determined by your service agreement. Contact your sales representative or
Customer Service for details.
Modifications
Any changes or modifications made to this device that are not expressly approved by ADC DSL
Systems, Inc. voids the user's warranty.
All wiring external to the products should follow the provisions of the current edition of the National
Electrical Code.
Standards Compliance
This equipment has been tested and verified to comply with the applicable sections of the following
safety standards:
❑GR 63-CORE - Network Equipment-Building System (NEBS) Requirements
❑GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
❑Binational standard, UL-1950/CSA-C22.2 No. 950-95: Safety of Information Technology
Equipment
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of
ADC DSL Systems, Inc. Other product names mentioned in this installation guide are used for
identification purposes only and may be trademarks or registered trademarks of their respective
companies.
Copyright Information
© 2002 ADC DSL Systems, Inc. All rights reserved. Information contained in this document is company
private to ADC DSL Systems, Inc., and shall not be modified, used, copied, reproduced or disclosed in
whole or in part without the written consent of ADC.
ADC DSL Systems, Inc.
14402 Franklin Avenue
Tustin, CA 92780-7013
Tel: [phone]
Fax: [phone]
Technical Assistance
Tel: [phone]
Tel: [phone]
Fax: [phone]
DNV C ertificatio n, Inc.
REGISTERED FIRM
ISO 9001/TL 9000
THE HDU-404 LIST 2
The HiGain®HDU-404 List 2 is a low-power micro doubler unit that extends the
range of a HiGain repeaterless T1 transmission system. The doubler units are installed
between any doubler-compatible HiGain Line Unit (HLU) and a HiGain Doubler Unit
(HDU) or HiGain Remote Unit (HRU). Each doubler allows 1.544 Mbps transmission
over an additional Carrier Service Area (CSA) range. The HDU-404 is compatible
with both the HiGain and PG-Flex product lines. The CSA includes loops up to
12,000 feet (3.657 km) of 24 AWG or 9,000 feet (2.743 km) of 26 AWG wire.
FEATURES
SPECIFICATIONS
•Occupies one 200-mechanics slot •Extremely low latency
•Powered by any doubler-compatible HiGain
or PG-Flex line unit •Compatible with PG-Flex List 3x line units in configurations with up to three spans
•Extremely low power dissipation •Minimal wander and jitter
•Lightning and power cross-protection on
both sides of the High-bit-rate Digital
Subscriber Line (HDSL) interface
•Used in four-span line-powered circuits (three
doublers and one remote) or five-span locally
powered circuits (four line-powered doublers
and one locally powered remote)
•Front-panel status display Light Emitting
Diode (LED)
Operating Temperature -40 °F (-40 °C) to +149 °F (+65 °C)
Operating Humidity 5% to 95% non-condensing
Operating Temperature in Outside Enclosures Complies with Section 10.2.1.3 of TA-NWT-001210
Operating Elevation 200 feet (60.96 m) below sea level to 13,000 feet
(3.96 km) above sea level
Mounting Standard 400 or SLIM™ (half the width of a 400)
HDSL Line Code 784 kbps, Two Binary, One Quaternary (2B1Q)
full duplex
HDSL Output +13.0 dBm, 135 Ω
Maximum Provisioning Loss 35 dB at 196 KHz, 135 Ω
Line Clock Rate Internal Stratum 4 clock
Power Consumption 3.1 W (nominal)
Resistive Signature Input/Output 25 Ω(maximum)
BEFORE YOU BEGIN
1Verify that you are installing the HDU-404 List 2 with the following compatible
HiGain outdoor enclosures:
•HRE-450 List 5, single-slot
•HRE-423, 3-slot
•HRE-454, 4-slot
2Verify that you are installing the HDU-404 List 2 with compatible line and
remote circuit modules (see Table 1 inside).
3Determine the number of doublers the circuit can support based upon:
•the model of the HLU and HRU in the circuit (see Table 1)
•whether or not the HRU is locally powered or line powered (see Table 1)
•whether you are installing in a HiGain (see “HiGain Doubler Applications”)
or PG-Flex application (see “PG-Flex Doubler Applications”).
4Observe the following rules for enclosure placement:
•Rule 1: Place the enclosures at the electrical limits (35 dB) of each span.
•Rule 2: Make all spans the same electrical length (same 196 kHz loss) to
achieve optimum performance if Rule 1 is not applicable.
•Rule 3: Confirm that the spans closest to the HLU be as short as possible and
the spans furthest from the HLU be as long as possible to minimize power
consumption and dissipation of the HLU.
5Determine the enclosure capacity based upon solar exposure and maximum
ambient temperature factors as shown in Table 2, “Solar Load and Maximum
Ambient Temperature for Slots 1 through 4”.
Continued Þ
´,-}¶5ƨ
1213935
September 15, 2000
Product Catalog: HDU-404-L2
CLEI: T1R6AFDC
Document: 350-404-102-02, Issue 2
2
HiGain
DOUBLER
HDU-404 LIST 2
DOUBLER UNIT
QUICK INSTALLATION

HiGain
HiGain
FCC Class A Compliance
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Limited Warranty
Product warranty is determined by your service agreement. Contact your sales representative or
Customer Service for details.
Modifications
Any changes or modifications made to this device that are not expressly approved by ADC DSL
Systems, Inc. voids the user's warranty.
All wiring external to the products should follow the provisions of the current edition of the National
Electrical Code.
Standards Compliance
This equipment has been tested and verified to comply with the applicable sections of the following
safety standards:
❑GR 63-CORE - Network Equipment-Building System (NEBS) Requirements
❑GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
❑Binational standard, UL-1950/CSA-C22.2 No. 950-95: Safety of Information Technology
Equipment
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of
ADC DSL Systems, Inc. Other product names mentioned in this installation guide are used for
identification purposes only and may be trademarks or registered trademarks of their respective
companies.
Copyright Information
© 2002 ADC DSL Systems, Inc. All rights reserved. Information contained in this document is company
private to ADC DSL Systems, Inc., and shall not be modified, used, copied, reproduced or disclosed in
whole or in part without the written consent of ADC.
ADC DSL Systems, Inc.
14402 Franklin Avenue
Tustin, CA 92780-7013
Tel: [phone]
Fax: [phone]
Technical Assistance
Tel: [phone]
Tel: [phone]
Fax: [phone]
DNV C ertificatio n, Inc.
REGISTERED FIRM
ISO 9001/TL 9000
THE HDU-404 LIST 2
The HiGain®HDU-404 List 2 is a low-power micro doubler unit that extends the
range of a HiGain repeaterless T1 transmission system. The doubler units are installed
between any doubler-compatible HiGain Line Unit (HLU) and a HiGain Doubler Unit
(HDU) or HiGain Remote Unit (HRU). Each doubler allows 1.544 Mbps transmission
over an additional Carrier Service Area (CSA) range. The HDU-404 is compatible
with both the HiGain and PG-Flex product lines. The CSA includes loops up to
12,000 feet (3.657 km) of 24 AWG or 9,000 feet (2.743 km) of 26 AWG wire.
FEATURES
SPECIFICATIONS
•Occupies one 200-mechanics slot •Extremely low latency
•Powered by any doubler-compatible HiGain
or PG-Flex line unit •Compatible with PG-Flex List 3x line units in configurations with up to three spans
•Extremely low power dissipation •Minimal wander and jitter
•Lightning and power cross-protection on
both sides of the High-bit-rate Digital
Subscriber Line (HDSL) interface
•Used in four-span line-powered circuits (three
doublers and one remote) or five-span locally
powered circuits (four line-powered doublers
and one locally powered remote)
•Front-panel status display Light Emitting
Diode (LED)
Operating Temperature -40 °F (-40 °C) to +149 °F (+65 °C)
Operating Humidity 5% to 95% non-condensing
Operating Temperature in Outside Enclosures Complies with Section 10.2.1.3 of TA-NWT-001210
Operating Elevation 200 feet (60.96 m) below sea level to 13,000 feet
(3.96 km) above sea level
Mounting Standard 400 or SLIM™ (half the width of a 400)
HDSL Line Code 784 kbps, Two Binary, One Quaternary (2B1Q)
full duplex
HDSL Output +13.0 dBm, 135 Ω
Maximum Provisioning Loss 35 dB at 196 KHz, 135 Ω
Line Clock Rate Internal Stratum 4 clock
Power Consumption 3.1 W (nominal)
Resistive Signature Input/Output 25 Ω(maximum)
BEFORE YOU BEGIN
1Verify that you are installing the HDU-404 List 2 with the following compatible
HiGain outdoor enclosures:
•HRE-450 List 5, single-slot
•HRE-423, 3-slot
•HRE-454, 4-slot
2Verify that you are installing the HDU-404 List 2 with compatible line and
remote circuit modules (see Table 1 inside).
3Determine the number of doublers the circuit can support based upon:
•the model of the HLU and HRU in the circuit (see Table 1)
•whether or not the HRU is locally powered or line powered (see Table 1)
•whether you are installing in a HiGain (see “HiGain Doubler Applications”)
or PG-Flex application (see “PG-Flex Doubler Applications”).
4Observe the following rules for enclosure placement:
•Rule 1: Place the enclosures at the electrical limits (35 dB) of each span.
•Rule 2: Make all spans the same electrical length (same 196 kHz loss) to
achieve optimum performance if Rule 1 is not applicable.
•Rule 3: Confirm that the spans closest to the HLU be as short as possible and
the spans furthest from the HLU be as long as possible to minimize power
consumption and dissipation of the HLU.
5Determine the enclosure capacity based upon solar exposure and maximum
ambient temperature factors as shown in Table 2, “Solar Load and Maximum
Ambient Temperature for Slots 1 through 4”.
Continued Þ
´,-}¶5ƨ
1213935
September 15, 2000
Product Catalog: HDU-404-L2
CLEI: T1R6AFDC
Document: 350-404-102-02, Issue 2
2
HiGain
DOUBLER
HDU-404 LIST 2
DOUBLER UNIT
QUICK INSTALLATION

HiGain
HiGain
FCC Class A Compliance
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Limited Warranty
Product warranty is determined by your service agreement. Contact your sales representative or
Customer Service for details.
Modifications
Any changes or modifications made to this device that are not expressly approved by ADC DSL
Systems, Inc. voids the user's warranty.
All wiring external to the products should follow the provisions of the current edition of the National
Electrical Code.
Standards Compliance
This equipment has been tested and verified to comply with the applicable sections of the following
safety standards:
❑GR 63-CORE - Network Equipment-Building System (NEBS) Requirements
❑GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
❑Binational standard, UL-1950/CSA-C22.2 No. 950-95: Safety of Information Technology
Equipment
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of
ADC DSL Systems, Inc. Other product names mentioned in this installation guide are used for
identification purposes only and may be trademarks or registered trademarks of their respective
companies.
Copyright Information
© 2002 ADC DSL Systems, Inc. All rights reserved. Information contained in this document is company
private to ADC DSL Systems, Inc., and shall not be modified, used, copied, reproduced or disclosed in
whole or in part without the written consent of ADC.
ADC DSL Systems, Inc.
14402 Franklin Avenue
Tustin, CA 92780-7013
Tel: [phone]
Fax: [phone]
Technical Assistance
Tel: [phone]
Tel: [phone]
Fax: [phone]
DNV C ertificatio n, Inc.
REGISTERED FIRM
ISO 9001/TL 9000
THE HDU-404 LIST 2
The HiGain®HDU-404 List 2 is a low-power micro doubler unit that extends the
range of a HiGain repeaterless T1 transmission system. The doubler units are installed
between any doubler-compatible HiGain Line Unit (HLU) and a HiGain Doubler Unit
(HDU) or HiGain Remote Unit (HRU). Each doubler allows 1.544 Mbps transmission
over an additional Carrier Service Area (CSA) range. The HDU-404 is compatible
with both the HiGain and PG-Flex product lines. The CSA includes loops up to
12,000 feet (3.657 km) of 24 AWG or 9,000 feet (2.743 km) of 26 AWG wire.
FEATURES
SPECIFICATIONS
•Occupies one 200-mechanics slot •Extremely low latency
•Powered by any doubler-compatible HiGain
or PG-Flex line unit •Compatible with PG-Flex List 3x line units in configurations with up to three spans
•Extremely low power dissipation •Minimal wander and jitter
•Lightning and power cross-protection on
both sides of the High-bit-rate Digital
Subscriber Line (HDSL) interface
•Used in four-span line-powered circuits (three
doublers and one remote) or five-span locally
powered circuits (four line-powered doublers
and one locally powered remote)
•Front-panel status display Light Emitting
Diode (LED)
Operating Temperature -40 °F (-40 °C) to +149 °F (+65 °C)
Operating Humidity 5% to 95% non-condensing
Operating Temperature in Outside Enclosures Complies with Section 10.2.1.3 of TA-NWT-001210
Operating Elevation 200 feet (60.96 m) below sea level to 13,000 feet
(3.96 km) above sea level
Mounting Standard 400 or SLIM™ (half the width of a 400)
HDSL Line Code 784 kbps, Two Binary, One Quaternary (2B1Q)
full duplex
HDSL Output +13.0 dBm, 135 Ω
Maximum Provisioning Loss 35 dB at 196 KHz, 135 Ω
Line Clock Rate Internal Stratum 4 clock
Power Consumption 3.1 W (nominal)
Resistive Signature Input/Output 25 Ω(maximum)
BEFORE YOU BEGIN
1Verify that you are installing the HDU-404 List 2 with the following compatible
HiGain outdoor enclosures:
•HRE-450 List 5, single-slot
•HRE-423, 3-slot
•HRE-454, 4-slot
2Verify that you are installing the HDU-404 List 2 with compatible line and
remote circuit modules (see Table 1 inside).
3Determine the number of doublers the circuit can support based upon:
•the model of the HLU and HRU in the circuit (see Table 1)
•whether or not the HRU is locally powered or line powered (see Table 1)
•whether you are installing in a HiGain (see “HiGain Doubler Applications”)
or PG-Flex application (see “PG-Flex Doubler Applications”).
4Observe the following rules for enclosure placement:
•Rule 1: Place the enclosures at the electrical limits (35 dB) of each span.
•Rule 2: Make all spans the same electrical length (same 196 kHz loss) to
achieve optimum performance if Rule 1 is not applicable.
•Rule 3: Confirm that the spans closest to the HLU be as short as possible and
the spans furthest from the HLU be as long as possible to minimize power
consumption and dissipation of the HLU.
5Determine the enclosure capacity based upon solar exposure and maximum
ambient temperature factors as shown in Table 2, “Solar Load and Maximum
Ambient Temperature for Slots 1 through 4”.
Continued Þ
´,-}¶5ƨ
1213935
September 15, 2000
Product Catalog: HDU-404-L2
CLEI: T1R6AFDC
Document: 350-404-102-02, Issue 2
2
HiGain
DOUBLER
HDU-404 LIST 2
DOUBLER UNIT
QUICK INSTALLATION

HIGAIN DOUBLER APPLICATIONS
The HDU-404 List 2 can be used in two- to five-span circuits, depending on the HLU model and the power option (line or local) of the compatible HRU. Table 1 lists the maximum number of doublers that can be deployed.
PG-FLEX DOUBLER APPLICATIONS
Figure 1 shows a typical HDU-404 List 2 installation for the PG-Flex subscriber carrier system. For each doubler installed between the PG-Flex Central Office Terminal (COT) and Remote Terminal (RT), two auxiliary power pairs are required. A maximum of two doublers may be installed in a PG-Flex system. With two doublers, four sets of
auxiliary power pairs must be installed between the COT and the RT. These auxiliary power pairs must be the same wire gauge (or larger) as the pairs used for HDSL.
Figure 1. Typical HDU Installation with PG-Flex
DOUBLER DEPLOYMENT
Sealed multislot outdoor enclosures restrict the rate of heat transfer to the outside air. This restriction may result in excessive heat buildup. Table 2 shows the number and location of occupied slots that can be reliably housed in either the HRE-423, HRE-450, or HRE-454 enclosure as a function of solar exposure and maximum ambient temperature.
INSTALLATION
1Align the HDU-404 List 2 with the enclosure slot guides and slide the unit in. 2Push the unit into the enclosure until it snaps into place, indicating that it is properly
seated. POWER-UPSEQUENCE
Once the HDU-404 is installed in the enclosure, the front panel Status LED flashes green when power is applied from an upstream line unit. Once the loops on both sides of the HDU synchronize, the LED turns a steady green.
CLEI/ECI bar code label
List number
Configuration number label
Extraction handle
Status LED
27 25 23 21 19 17 15 13 11 9 7 3 5 1
HDSL1Tip(in) HDSL1Ring(out) DC(in)Test HDSL2 Tip(in) HDSL2Ring(out)
28
26
24
22
20 18
16
14
12
10
8
4
6
2
55 53 51 49 47 45 43 41 39 37 35
32 31
56
36
34
30
33 29
ChassisGround HDSL2Tip(out)
DC(out)Test
Burn-in
ChassisGround
Status LED reports the following conditions that are shown in order of priority:
Card-edge connector
54
52
50
48
46
44
42
40 38
HDSL2Ring(in) LogicGround(-48VDCreturn) HDSL1Ring(in) HDSL1Tip(out)
2
HiGain
DOUBLER
Indicates synchronization is being attempted between the HDU-409 and the upstream (network) module. Indicates synchronization is being attempted between the HDU-409 and the downstream (customer) module.
Indicates HDSL frame synchronization has been achieved between the HDU-409 and both the upstream and downstream modules.
Indicates HDSL Cyclic Redundancy Check (CRC) error has occured between the HDU-409 and the upstream module.
Indicates HDSL CRC error has occured between the HDU-409 and the downstream module.
Indicates a loopback at the doubler towards the network. This loopback tests the integrity of the upstream span. Indicates a loopback at the doubler towards the customer. This loopback tests the integrity of the downstream span. Indicates the HDSL margin is less than the margin threshold provisioned for the circuit.
Flashing green (once per second) Flashing green (twice per second)
Solid green
Flashing red (once per second)
Flashing red (twice per second)
Flashing yellow (once per second) Flashing yellow (twice per second) Solid yellow
Table 1. Maximum Number of HDU-404 List 2 Doublers per Circuit
HLU Model
Maximum Number of HDU-404 Doublers Per Circuit (a)
(a) The HRU-412 is limited to applications with one and two doublers only.
Line-Powered Remote Locally Powered Remote
I-CPE ON I-CPE OFF I-CPE ON I-CPE OFF
HLU-388 List 2x, HLU-319 List 2x, HLU-231 List 3D, HLU-231 List 6D, HLU-232 List 1D, HLU-231 List 7x, HLU-431 List 1x
1 2 2 2
HLU-231 List 8D, HLU-319 List 5D, HLU-388 List 5D HLU-231 List 8/List 8E, HLU-319 List 5/List 5E, HLU-388 List 5/List 5E
2 3 (b)
(b) Requires HRU-402, all lists.
2 4 (c)
(c) Requires HRU-402 List 1 or List 3.
HiGain systems support doubler loopbacks when HiGain doublers are used with compatible HiGain circuit modules. Consult your line unit documentation for details on how to execute generic, special, and doubler loopbacks. PG-Flex systems do not support doubler loopbacks.
PG-Flex
RT
Doubler 1
HDU-404
PG-Flex
COT Span 1
HDSL
Auxiliary Power Pairs
Span 2 HDSL
Table 2. Solar Load and Maximum Ambient Temperature
for Slots 1 through 4 (a)
(a) Doubler-occupied slots.
Slot Occupancy
Slot 1 Slot 2 Slot 3 Slot 4 Solar Load (b)
(b) Maximum sunlightexposure per TR-TSY-000057.None = Doublersareinside aremote
enclosure, underground, or fully shaded.
Maximum Ambient
Temperature (c)
(c) Outside air temperature.
HRE-423 (3-slot)
x x x Full 135 °F x x x None 140 °F x x Full 145 °F x x None 135 °F
x Full 155 °F x None 160 °F
HRE-450 (1-slot)
x Full 150 °F x None 160 °F
HRE-454 (4-slot)
xxxx Full 125 °F
xxxx None 130 °F xx x Full 135 °F x x x None 140 °F
xxFull145 °F xxNone
150 °F
xFull
155 °F
x None 160 °F
The HDU has a Ground Fault Detection (GFD) circuit as described in R7-1, Section 7.2.1 of GR-1089 CORE, Issue 1, Revision 1, December 1996. When used in a HiGain circuit, the HDU-404 List 2 immediately detects ground faults occurring at any point in any span and shuts down the HDSL power feed circuit until the ground fault is located and repaired. When using older doublers without a GFD circuit, the HDU-404 must be the doubler nearest the HLU to support GFD. The ground plane of the doubler enclosure must be securely connected to earth ground.

HIGAIN DOUBLER APPLICATIONS
The HDU-404 List 2 can be used in two- to five-span circuits, depending on the HLU model
and the power option (line or local) of the compatible HRU. Table 1 lists the maximum
number of doublers that can be deployed.
PG-FLEX DOUBLER APPLICATIONS
Figure 1 shows a typical HDU-404 List 2 installation for the PG-Flex subscriber carrier
system. For each doubler installed between the PG-Flex Central Office Terminal (COT)
and Remote Terminal (RT), two auxiliary power pairs are required. A maximum of two
doublers may be installed in a PG-Flex system. With two doublers, four sets of
auxiliary power pairs must be installed between the COT and the RT. These
auxiliary power pairs must be the same wire gauge (or larger) as the pairs used for
HDSL.
Figure 1. Typical HDU Installation with PG-Flex
DOUBLER DEPLOYMENT
Sealed multislot outdoor enclosures restrict the rate of heat transfer to the outside air. This
restriction may result in excessive heat buildup. Table 2 shows the number and location of
occupied slots that can be reliably housed in either the HRE-423, HRE-450, or HRE-454
enclosure as a function of solar exposure and maximum ambient temperature.
INSTALLATION
1Align the HDU-404 List 2 with the enclosure slot guides and slide the unit in.
2Push the unit into the enclosure until it snaps into place, indicating that it is properly
seated.
POWER-UPSEQUENCE
Once the HDU-404 is installed in the enclosure, the front panel Status LED flashes green
when power is applied from an upstream line unit. Once the loops on both sides of the HDU
synchronize, the LED turns a steady green.
CLEI/ECI bar code label
List number
Configuration number label
Extraction handle
Status LED
27
25
23
21
19
17
15
13
11
9
7
3
5
1
HDSL1Tip(in)
HDSL1Ring(out)
DC(in)Test
HDSL2 Tip(in)
HDSL2Ring(out)
28
26
24
22
20
18
16
14
12
10
8
4
6
2
55
53
51
49
47
45
43
41
39
37
35
32 31
56
36
34
30
33
29
ChassisGround
HDSL2Tip(out)
DC(out)Test
Burn-in
ChassisGround
Status LED reports the following conditions
that are shown in order of priority:
Card-edge connector
54
52
50
48
46
44
42
40
38
HDSL2Ring(in)
LogicGround(-48VDCreturn)
HDSL1Ring(in)
HDSL1Tip(out)
2
HiGain
DOUBLER
Indicates synchronization is being attempted between
the HDU-409 and the upstream (network) module.
Indicates synchronization is being attempted between
the HDU-409 and the downstream (customer) module.
Indicates HDSL frame synchronization has been
achieved between the HDU-409 and both the upstream
and downstream modules.
Indicates HDSL Cyclic Redundancy Check (CRC) error
has occured between the HDU-409 and the upstream module.
Indicates HDSL CRC error has occured between the
HDU-409 and the downstream module.
Indicates a loopback at the doubler towards the network.
This loopback tests the integrity of the upstream span.
Indicates a loopback at the doubler towards the customer.
This loopback tests the integrity of the downstream span.
Indicates the HDSL margin is less than the margin threshold
provisioned for the circuit.
Flashing green (once per
second)
Flashing green (twice
per second)
Solid green
Flashing red (once per
second)
Flashing red (twice
per second)
Flashing yellow (once per
second)
Flashing yellow (twice
per second)
Solid yellow
Table 1. Maximum Number of HDU-404 List 2 Doublers per Circuit
HLU Model
Maximum Number of HDU-404 Doublers Per Circuit (a)
(a) The HRU-412 is limited to applications with one and two doublers only.
Line-Powered Remote Locally Powered Remote
I-CPE ON I-CPE OFF I-CPE ON I-CPE OFF
HLU-388 List 2x,
HLU-319 List 2x,
HLU-231 List 3D,
HLU-231 List 6D,
HLU-232 List 1D,
HLU-231 List 7x,
HLU-431 List 1x
1 2 2 2
HLU-231 List 8D,
HLU-319 List 5D,
HLU-388 List 5D
HLU-231 List 8/List 8E,
HLU-319 List 5/List 5E,
HLU-388 List 5/List 5E
2 3 (b)
(b) Requires HRU-402, all lists.
2 4 (c)
(c) Requires HRU-402 List 1 or List 3.
HiGain systems support doubler loopbacks when HiGain
doublers are used with compatible HiGain circuit modules.
Consult your line unit documentation for details on how to
execute generic, special, and doubler loopbacks.
PG-Flex systems do not support doubler loopbacks.
PG-Flex
RT
Doubler 1
HDU-404
PG-Flex
COT Span 1
HDSL
Auxiliary Power Pairs
Span 2
HDSL
Table 2. Solar Load and Maximum Ambient Temperature
for Slots 1 through 4 (a)
(a) Doubler-occupied slots.
Slot Occupancy
Slot 1 Slot 2 Slot 3 Slot 4 Solar Load (b)
(b) Maximum sunlightexposure per TR-TSY-000057.None = Doublersareinside aremote
enclosure, underground, or fully shaded.
Maximum Ambient
Temperature (c)
(c) Outside air temperature.
HRE-423 (3-slot)
x x x Full 135 °F
x x x None 140 °F
x x Full 145 °F
x x None 135 °F
x Full 155 °F
x None 160 °F
HRE-450 (1-slot)
x Full 150 °F
x None 160 °F
HRE-454 (4-slot)
xxxx Full 125 °F
xxxx None 130 °F
xx x Full 135 °F
x x x None 140 °F
xxFull145 °F
xxNone
150 °F
xFull
155 °F
x None 160 °F
The HDU has a Ground Fault Detection (GFD) circuit as described
in R7-1, Section 7.2.1 of GR-1089 CORE, Issue 1, Revision 1,
December 1996.
When used in a HiGain circuit, the HDU-404 List 2 immediately detects
ground faults occurring at any point in any span and shuts down the
HDSL power feed circuit until the ground fault is located and repaired.
When using older doublers without a GFD circuit, the HDU-404 must
be the doubler nearest the HLU to support GFD. The ground plane of
the doubler enclosure must be securely connected to earth ground.

HIGAIN DOUBLER APPLICATIONS
The HDU-404 List 2 can be used in two- to five-span circuits, depending on the HLU model
and the power option (line or local) of the compatible HRU. Table 1 lists the maximum
number of doublers that can be deployed.
PG-FLEX DOUBLER APPLICATIONS
Figure 1 shows a typical HDU-404 List 2 installation for the PG-Flex subscriber carrier
system. For each doubler installed between the PG-Flex Central Office Terminal (COT)
and Remote Terminal (RT), two auxiliary power pairs are required. A maximum of two
doublers may be installed in a PG-Flex system. With two doublers, four sets of
auxiliary power pairs must be installed between the COT and the RT. These
auxiliary power pairs must be the same wire gauge (or larger) as the pairs used for
HDSL.
Figure 1. Typical HDU Installation with PG-Flex
DOUBLER DEPLOYMENT
Sealed multislot outdoor enclosures restrict the rate of heat transfer to the outside air. This
restriction may result in excessive heat buildup. Table 2 shows the number and location of
occupied slots that can be reliably housed in either the HRE-423, HRE-450, or HRE-454
enclosure as a function of solar exposure and maximum ambient temperature.
INSTALLATION
1Align the HDU-404 List 2 with the enclosure slot guides and slide the unit in.
2Push the unit into the enclosure until it snaps into place, indicating that it is properly
seated.
POWER-UPSEQUENCE
Once the HDU-404 is installed in the enclosure, the front panel Status LED flashes green
when power is applied from an upstream line unit. Once the loops on both sides of the HDU
synchronize, the LED turns a steady green.
CLEI/ECI bar code label
List number
Configuration number label
Extraction handle
Status LED
27
25
23
21
19
17
15
13
11
9
7
3
5
1
HDSL1Tip(in)
HDSL1Ring(out)
DC(in)Test
HDSL2 Tip(in)
HDSL2Ring(out)
28
26
24
22
20
18
16
14
12
10
8
4
6
2
55
53
51
49
47
45
43
41
39
37
35
32 31
56
36
34
30
33
29
ChassisGround
HDSL2Tip(out)
DC(out)Test
Burn-in
ChassisGround
Status LED reports the following conditions
that are shown in order of priority:
Card-edge connector
54
52
50
48
46
44
42
40
38
HDSL2Ring(in)
LogicGround(-48VDCreturn)
HDSL1Ring(in)
HDSL1Tip(out)
2
HiGain
DOUBLER
Indicates synchronization is being attempted between
the HDU-409 and the upstream (network) module.
Indicates synchronization is being attempted between
the HDU-409 and the downstream (customer) module.
Indicates HDSL frame synchronization has been
achieved between the HDU-409 and both the upstream
and downstream modules.
Indicates HDSL Cyclic Redundancy Check (CRC) error
has occured between the HDU-409 and the upstream module.
Indicates HDSL CRC error has occured between the
HDU-409 and the downstream module.
Indicates a loopback at the doubler towards the network.
This loopback tests the integrity of the upstream span.
Indicates a loopback at the doubler towards the customer.
This loopback tests the integrity of the downstream span.
Indicates the HDSL margin is less than the margin threshold
provisioned for the circuit.
Flashing green (once per
second)
Flashing green (twice
per second)
Solid green
Flashing red (once per
second)
Flashing red (twice
per second)
Flashing yellow (once per
second)
Flashing yellow (twice
per second)
Solid yellow
Table 1. Maximum Number of HDU-404 List 2 Doublers per Circuit
HLU Model
Maximum Number of HDU-404 Doublers Per Circuit (a)
(a) The HRU-412 is limited to applications with one and two doublers only.
Line-Powered Remote Locally Powered Remote
I-CPE ON I-CPE OFF I-CPE ON I-CPE OFF
HLU-388 List 2x,
HLU-319 List 2x,
HLU-231 List 3D,
HLU-231 List 6D,
HLU-232 List 1D,
HLU-231 List 7x,
HLU-431 List 1x
1 2 2 2
HLU-231 List 8D,
HLU-319 List 5D,
HLU-388 List 5D
HLU-231 List 8/List 8E,
HLU-319 List 5/List 5E,
HLU-388 List 5/List 5E
2 3 (b)
(b) Requires HRU-402, all lists.
2 4 (c)
(c) Requires HRU-402 List 1 or List 3.
HiGain systems support doubler loopbacks when HiGain
doublers are used with compatible HiGain circuit modules.
Consult your line unit documentation for details on how to
execute generic, special, and doubler loopbacks.
PG-Flex systems do not support doubler loopbacks.
PG-Flex
RT
Doubler 1
HDU-404
PG-Flex
COT Span 1
HDSL
Auxiliary Power Pairs
Span 2
HDSL
Table 2. Solar Load and Maximum Ambient Temperature
for Slots 1 through 4 (a)
(a) Doubler-occupied slots.
Slot Occupancy
Slot 1 Slot 2 Slot 3 Slot 4 Solar Load (b)
(b) Maximum sunlightexposure per TR-TSY-000057.None = Doublersareinside aremote
enclosure, underground, or fully shaded.
Maximum Ambient
Temperature (c)
(c) Outside air temperature.
HRE-423 (3-slot)
x x x Full 135 °F
x x x None 140 °F
x x Full 145 °F
x x None 135 °F
x Full 155 °F
x None 160 °F
HRE-450 (1-slot)
x Full 150 °F
x None 160 °F
HRE-454 (4-slot)
xxxx Full 125 °F
xxxx None 130 °F
xx x Full 135 °F
x x x None 140 °F
xxFull145 °F
xxNone
150 °F
xFull
155 °F
x None 160 °F
The HDU has a Ground Fault Detection (GFD) circuit as described
in R7-1, Section 7.2.1 of GR-1089 CORE, Issue 1, Revision 1,
December 1996.
When used in a HiGain circuit, the HDU-404 List 2 immediately detects
ground faults occurring at any point in any span and shuts down the
HDSL power feed circuit until the ground fault is located and repaired.
When using older doublers without a GFD circuit, the HDU-404 must
be the doubler nearest the HLU to support GFD. The ground plane of
the doubler enclosure must be securely connected to earth ground.

HiGain
HiGain
FCC Class A Compliance
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
Limited Warranty
Product warranty is determined by your service agreement. Contact your sales representative or
Customer Service for details.
Modifications
Any changes or modifications made to this device that are not expressly approved by ADC DSL
Systems, Inc. voids the user's warranty.
All wiring external to the products should follow the provisions of the current edition of the National
Electrical Code.
Standards Compliance
This equipment has been tested and verified to comply with the applicable sections of the following
safety standards:
❑GR 63-CORE - Network Equipment-Building System (NEBS) Requirements
❑GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
❑Binational standard, UL-1950/CSA-C22.2 No. 950-95: Safety of Information Technology
Equipment
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc. HiGain is a registered trademark of
ADC DSL Systems, Inc. Other product names mentioned in this installation guide are used for
identification purposes only and may be trademarks or registered trademarks of their respective
companies.
Copyright Information
© 2002 ADC DSL Systems, Inc. All rights reserved. Information contained in this document is company
private to ADC DSL Systems, Inc., and shall not be modified, used, copied, reproduced or disclosed in
whole or in part without the written consent of ADC.
ADC DSL Systems, Inc.
14402 Franklin Avenue
Tustin, CA 92780-7013
Tel: [phone]
Fax: [phone]
Technical Assistance
Tel: [phone]
Tel: [phone]
Fax: [phone]
DNV C ertificatio n, Inc.
REGISTERED FIRM
ISO 9001/TL 9000
THE HDU-404 LIST 2
The HiGain®HDU-404 List 2 is a low-power micro doubler unit that extends the
range of a HiGain repeaterless T1 transmission system. The doubler units are installed
between any doubler-compatible HiGain Line Unit (HLU) and a HiGain Doubler Unit
(HDU) or HiGain Remote Unit (HRU). Each doubler allows 1.544 Mbps transmission
over an additional Carrier Service Area (CSA) range. The HDU-404 is compatible
with both the HiGain and PG-Flex product lines. The CSA includes loops up to
12,000 feet (3.657 km) of 24 AWG or 9,000 feet (2.743 km) of 26 AWG wire.
FEATURES
SPECIFICATIONS
•Occupies one 200-mechanics slot •Extremely low latency
•Powered by any doubler-compatible HiGain
or PG-Flex line unit •Compatible with PG-Flex List 3x line units in configurations with up to three spans
•Extremely low power dissipation •Minimal wander and jitter
•Lightning and power cross-protection on
both sides of the High-bit-rate Digital
Subscriber Line (HDSL) interface
•Used in four-span line-powered circuits (three
doublers and one remote) or five-span locally
powered circuits (four line-powered doublers
and one locally powered remote)
•Front-panel status display Light Emitting
Diode (LED)
Operating Temperature -40 °F (-40 °C) to +149 °F (+65 °C)
Operating Humidity 5% to 95% non-condensing
Operating Temperature in Outside Enclosures Complies with Section 10.2.1.3 of TA-NWT-001210
Operating Elevation 200 feet (60.96 m) below sea level to 13,000 feet
(3.96 km) above sea level
Mounting Standard 400 or SLIM™ (half the width of a 400)
HDSL Line Code 784 kbps, Two Binary, One Quaternary (2B1Q)
full duplex
HDSL Output +13.0 dBm, 135 Ω
Maximum Provisioning Loss 35 dB at 196 KHz, 135 Ω
Line Clock Rate Internal Stratum 4 clock
Power Consumption 3.1 W (nominal)
Resistive Signature Input/Output 25 Ω(maximum)
BEFORE YOU BEGIN
1Verify that you are installing the HDU-404 List 2 with the following compatible
HiGain outdoor enclosures:
•HRE-450 List 5, single-slot
•HRE-423, 3-slot
•HRE-454, 4-slot
2Verify that you are installing the HDU-404 List 2 with compatible line and
remote circuit modules (see Table 1 inside).
3Determine the number of doublers the circuit can support based upon:
•the model of the HLU and HRU in the circuit (see Table 1)
•whether or not the HRU is locally powered or line powered (see Table 1)
•whether you are installing in a HiGain (see “HiGain Doubler Applications”)
or PG-Flex application (see “PG-Flex Doubler Applications”).
4Observe the following rules for enclosure placement:
•Rule 1: Place the enclosures at the electrical limits (35 dB) of each span.
•Rule 2: Make all spans the same electrical length (same 196 kHz loss) to
achieve optimum performance if Rule 1 is not applicable.
•Rule 3: Confirm that the spans closest to the HLU be as short as possible and
the spans furthest from the HLU be as long as possible to minimize power
consumption and dissipation of the HLU.
5Determine the enclosure capacity based upon solar exposure and maximum
ambient temperature factors as shown in Table 2, “Solar Load and Maximum
Ambient Temperature for Slots 1 through 4”.
Continued Þ
´,-}¶5ƨ
1213935
September 15, 2000
Product Catalog: HDU-404-L2
CLEI: T1R6AFDC
Document: 350-404-102-02, Issue 2
2
HiGain
DOUBLER
HDU-404 LIST 2
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