PairGain HiGain HDU-217 User manual

PAIRGAIN TECHNOLOGIES
HIGAIN®MINI DOUBLERS
Model List Number Part Number CLEI Code
HDU-217 1 150-1506-01 T1R5AS0EAA
HDU-219 1 150-1501-01 T1R5AR0EAA
HCC-239 1 150-1550-01 N/A
PAIRGAIN TECHNOLOGIES, INC.
ENGINEERING SERVICES TECHNICAL PRACTICE
SECTION 150-219-100-02
Revision History of this practice.
Revision 02—December 22, 1997
A) Added references to new HCC-239 List 1
B) Added reference to AT&T 809 cabinet

Section 150-219-100-02 December 22, 1997
Page ii HDU-217/219 and HCC-239 List 1
Copyright 1997 PairGain Technologies, Inc.
PairGain and HiGain are registered trademarks of PairGain Technologies, Inc.
Information contained in this document is company private to PairGain Technologies,
Inc., and shall not be modified, used, copied, reproduced or disclosed in whole or in part
without the written consent of PairGain.
Other product names mentioned in this practice are used for identification purposes only
and may be trademarks and/or registered trademarks of their respective companies.

December 22, 1997 Section 150-219-100-02
HDU-217/219 and HCC-239 List 1 Page iii
TABLE OF CONTENTS
PRODUCT OVERVIEW______________________________1
Description and Features ...........................................1
About the Mini Doubler.............................................2
Compatibility ............................................................3
Specifications............................................................4
INSTALLING THE MINI DOUBLER __________________6
Inspecting Your Shipment .........................................6
Installing the Mini Doubler........................................6
Installing and Removing the Cut-Through Card.......13
Locating Doubler Unit Enclosures...........................15
TESTING THE UNIT _______________________________16
Using Alarms...........................................................16
Loopback Operation................................................17
SYSTEM ADMINISTRATION _______________________19
Fault Isolation..........................................................19
Technical Support....................................................20
CERTIFICATION AND WARRANTY_________________21
Certification ............................................................21
Warranty .................................................................21
ABBREVIATIONS__________________________________22

Section 150-219-100-02 December 22, 1997
Page iv HDU-217/219 and HCC-239 List 1
USING THIS TECHNICAL PRACTICE
Two types of messages, identified by icons, appear in the text:
A note informs you of special circumstances.
Cautions indicate the possibility of damage to
equipment or the possibility of personal injury.

December 22, 1997 Section 150-219-100-02
HDU-217/219 and HCC-239 List 1 Page 1
PRODUCT OVERVIEW
Description and Features
This product incorporates static sensitive
components. Proper electrostatic discharge
procedures must be followed.
The PairGain®HiGain®Models HDU-217 List 1 and HDU-219 List 1
are low power single-pair doubler units in mini-repeater packages.
Each extends the range of a HiGain repeaterless fractional T1
transmission system.
HDU-217 and HDU-219 HiGain Mini Doubler features include
(Figure1):

Front-panel LED status display

Lightning and power cross-protection on both HDSL interface
ports

Remote power capability from the HDU-D41 (HiGain Doubler
Unit D41) List 2D and the EPH-220 (EtherPhone™220) and
MM-220 (Megabit Modem™220) line units

Low-power dissipation
Figure 1. HDU-217 and HDU-219 List 1 Front Panels

Section 150-219-100-02 December 22, 1997
Page 2 HDU-217/219 and HCC-239 List 1
The HDU-217 and HDU-219 HiGain doubler units (HDUs) extend the
delivery of fractional T1 High-Capacity Digital Service (HCDS) to
customers over metallic cable pairs. The HDUs are installed between
a HLU-D41 List 2D (HiGain line unit) and a HRU-512 (HiGain
remote unit).
The HDU-217 and HDU-219 allow 784 Kbps transmission over twice
the normal Carrier Serving Area (CSA) range to 24,000 feet
(7.315 km) of 24 AWG or 18,000 feet (5.486 km) of 26 AWG copper
loops. Two doubler units can triple the CSA range to 36,000 feet
(10.97 km) of 24 AWG loops or to 27,000 feet (8.22 km) of 26 AWG
loops.
The HCC-239 (HiGain Cut-through Card) is provided with the
HDU-219. The HDU-219 mounts into two adjacent slots of a
standard 239 mini-T1 repeater apparatus case and blocks one slot.
The HCC-239 allows pair cut-through on the blocked repeater slot.
The HDU-217 doubler units occupy one slot of the original DDS or
ISDN repeater apparatus case—these slots are about twice the width
of a 239 T1 repeater. All HiGain modules comply with the applicable
requirements of Network Equipment Building System (NEBS)
Generic Equipment requirements TR-TSY-000063 and Transport
System Generic Requirements TSGR TR-TSY-000499.
About the Mini Doubler
HiGain uses PairGain’s Two-Binary, One-Quaternary (2B1Q) High-
bit-rate Digital Subscriber Line (HDSL) transceiver systems to
establish a full-duplex, 784 kbps data channel between the line units
and the remote units. Each HDU-217 and HDU-219 increases the
maximum range of a new doubler circuit by approximately 12,000
feet (3.66 km) for 24 AWG cable or 9,000 feet (2.74 km) for 26 AWG
cable.
A block diagram of the HDU-217 and HDU-219 with pinouts is
shown in Figure 2. The HDU-217 and HDU-219 power supplies use
the 200 Vdc power feed voltage received on the HDSL pair to
produce the +5 Vdc and –5 Vdc required by the HDU-217 and
HDU-219 electronics. The power feed continues through the HDSL
output pair to a second doubler or to the remote HRU-512.

December 22, 1997 Section 150-219-100-02
HDU-217/219 and HCC-239 List 1 Page 3
Figure 2. Mini Doubler Block Diagram
Compatibility
These HiGain mini doublers operate with any number of other T1,
POTS (Plain Old Telephone Service), Digital Data Service (DDS), or
other HiGain systems sharing the same cable binder group.
A list of HDSL signal cable losses for various cable gauges at 196
kHz and 135 Ohms is shown in Table 1. The table applies to the
HDSL cable pair between the HLU-D41 and the HDU as well as
between the HDU and the HRU-512.
Table 1. HDSL Signal Cable Loss
Cable Gauge Ohms/Thousand
Feet (0.3048 km) Loss @ 196 kHz (dB/thousand ft)*
26 AWG/0.4 mm 83.3 3.880
24 AWG/0.51 mm 51.9 2.841
22 AWG/0.61 mm 32.4 2.177
19 AWG/0.91 mm 16.1 1.535
*Add 3 dB for each bridged tap and 1 dB for each cable gauge change.

Section 150-219-100-02 December 22, 1997
Page 4 HDU-217/219 and HCC-239 List 1
Specifications
HDSL
Line Code................................................... 784 kbps, 2B1Q full
duplex
Output ........................................................ +13 dBm
Line Impedance.......................................... 135 Ohms
Line Input DC Resistive Signature.............. 25 Ohms
Line Output DC Resistive Signature........... 25 Ohms
Startup Time (per span).............................. 15 seconds (typical), 30
seconds (maximum)
Line Clock Rate
Internal Stratum 4 clock
Maximum Power Consumption
3.6 watts
Maximum Provisioning Loss
35 dB @ 196 kHz, 135 Ohms
Mounting
HDU-217.................................................... Single slot of original
DDS/IDSN Repeater
Mechanics
HDU-219.................................................... Dual 239 T1 Mechanics
Electrical Protection
Secondary surge and power cross protection on all HDSL ports

December 22, 1997 Section 150-219-100-02
HDU-217/219 and HCC-239 List 1 Page 5
Environmental
Operating Temperature............................... –40°to +149°F
(–40°to +65°C)
Operating Humidity (non-condensing)........ 5% to 95%
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
Dimensions
HDU-217
(Single slot of original DDS/IDSN Repeater Mechanics)
Height......................................................... 2.6 in. (6.6 cm)
Width .........................................................1.45 in. (3.7 cm)
Depth..........................................................6.5 in. (16.5 cm)
Weight........................................................1.8 lb (0.8165 kg)
HDU-219
(Dual 239 T1 Mechanics)
Height......................................................... 2.6 in. (6.6 cm)
Width .........................................................1.65 in. (4.2 cm)
Depth..........................................................6.5 in. (16.5 cm)
Weight........................................................1.8 lb (0.8165 kg)

Section 150-219-100-02 December 22, 1997
Page 6 HDU-217/219 and HCC-239 List 1
INSTALLING THE MINI DOUBLER
Inspecting Your Shipment
When you receive the equipment, 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.
Your shipment should consist of:
• One of the following doubler units
– One HDU-217 List 1
– One HDU-219 List 1 with one HCC-239 List 1
• This document
Installing the Mini Doubler
To install the HDU-217 or the HDU-219 in an enclosure, refer to the
installation manual of the enclosure for information about:
• Cabling
• Proper connections
• Grounding
• Line and local power
All wiring external to the product(s) should
follow the provisions of the current edition of
the National Electrical Code.
Once the HDU-217 or HDU-219 is installed in the enclosure, the
front-panel LED flashes and then lights a steady green. If the LED
continues to flash, or changes colors, refer to"Fault Isolation," in this
practice.
The HDU-217 and HDU-219 doubler units can be housed in a variety
of outdoor apparatus cases manufactured by various vendors. The
capacity of the doubler units in several of these standard enclosures is
listed in Table 2, Table 3, and Table 4. The number of doubler units
that can be plugged into each enclosure is limited by mandatory
thermal constraints. The constraints are imposed to avoid overheating
that may result in damage to the doubler units.

December 22, 1997 Section 150-219-100-02
HDU-217/219 and HCC-239 List 1 Page 7
You must observe these constraints for reliable service under worst-
case conditions. Consult PairGain when using the enclosures in
environments that are more hostile than those allowed by the
constraints or when using unlisted enclosures. Deployment rules for
determining the the best location for the enclosures are provided in
"Locating Doubler Unit Enclosures" in this practice.
The number of doubler units used in any of the enclosures depends on
the maximum outside ambient temperature. The capacities listed in
Table 2, Table 3, and Table 4 (for both indoor and outdoor
enclosures) are based on a maximum outside temperature of +115°F
(+46.1°C). These requirements comply with Section 10.2.1.3 of
TA-NWT-001210. The Section requires HDSL equipment placed in
outdoor cabinets to operate in a temperature, outside the housing, of
-40°F (-40°C) with no solar load and +115°F (+46.1°C) with
maximum solar load and maximum power dissipation. Full solar load
is equal to the maximum sunlight exposure as defined in
TR-TSY-000057.
The capacities listed for the indoor enclosures in Table 1 assume no
solar load. The capacities listed for the outdoor enclosures in Table 2
and Table 3 assume a full solar load as described above. In order to
reduce thermal stress, the "Recommended Slot Assignment for
Maximum Capacity" column assigns slots according to the following
two rules:
1Always leave at least one empty slot between adjacent doublers.
2Allow as much room as possible between doublers.
Slot assignments that differ from those recommended in the tables are
allowed, so long as the above two rules are applied.
The doubler capacity numbers listed for each outdoor enclosure must
be reduced by one for each additional +10°F (+5.5°C) rise (or any
fraction thereof) in outside ambient temperature above +115°F
(+46.1°C). The doubler capacity number for any application can be
increased by one for those applications having no solar load to bear
(not exposed to direct sunlight, as in manholes). However, any
increase in capacity is still subject to the above rule (1)that requires
at least one empty slot between adjacent doubler units in all
applications.

Section 150-219-100-02 December 22, 1997
Page 8 HDU-217/219 and HCC-239 List 1
For example, if the solar load is removed from the SPC 7430-8 T1 slot
enclosure, whose capacity is two doubler units with solar load,
capacity is increased to three doubler units. But this would
necessitate placing two doublers side by side, with no empty slot
between them. This violates the adjacency rule and thus forbids this
shelf configuration.
The empty slot requirement can be waived by reducing the otherwise
allowed capacity by one for every two doubler units that do not have
an empty slot between them. For instance, if the application allows
for seven doublers, but two are directly adjacent with no empty slot
between them, then the total capacity must be reduced to six.
Standard T1 and DDS repeaters can be installed in the same apparatus
case with the doubler unit. If this method is used, the maximum
number of doubler units that can occupy the same case with the
standard repeaters must be reduced by one for every four T1 repeaters
(or fractions thereof) installed and by one for every single DDS/ISDN
repeater installed.
For optimal performance, T1 and DDS repeaters located with doubler
units in outdoor enclosures should be placed in slots that are not
adjacent to the doubler units.
The 819 enclosure has two individual isolated chambers. Slots 1
through 14 are in one chamber. Slots 15 through 25, along with the
PRES, ALT, CAP, and COIL slots are in the other chamber.
Slot 7 of the 819 enclosure cannot be used for
doubler units because of mechanical interference
between the doubler unit cover and a mounting
screw in the cavity adjacent to slot 7.
There are 15 different models of the 819 enclosure. The HDU-219 is
compatible only with the following four models:
• 819 A1
• 819 A2
• 819 B1
• 819 B2

December 22, 1997 Section 150-219-100-02
HDU-217/219 and HCC-239 List 1 Page 9
Table 2. Indoor Enclosure Capacities for the
HDU-219 without Solar Load
Vendor Description Model
Number HDU-219 Doubler
Capacity
239 T1
Repeater
Capacity
Recommended
Slot
Assignment for
Maximum
Capacity
Charles Indoor wall
mount CiAC2300* 3 7 1, 3, 5
CiAC2002* 1 2 1
SPC Indoor
rack/wall
mount
4400-09 4 9 1, 3, 5, 7 or 2,
4, 6, 8
* Requires removing the metal slot separator.
The HDU-219 is not compatible with the older 818 T1 repeater
apparatus case because the 818 has a shallow cover, which cannot
accommodate the HDU-219 length. However, the 818 case can be
used if the shallow cover is replaced by the deeper cover of the 819
apparatus case.
The doubler unit capacity deployment rules can be summarized as
follows:
1Use Table 2 for indoor enclosures.
2Use Table 3 and Table 4 for outdoor enclosures with Full Solar
Load for ambient temperatures up to 115°F maximum.
3Increase the Table 3 and Table 4 capacities by one for non-solar
load (shaded or manhole) applications.
4Increase the Table 3 and Table 4 capacities by one for each full
10°F reduction in ambient temperature below 115°F.
5Decrease the Table 3 and Table 4 capacities by one for each
10°F increase, or fraction thereof, in ambient temperatures above
115°F.

Section 150-219-100-02 December 22, 1997
Page 10 HDU-217/219 and HCC-239 List 1
Table 3. Outdoor Enclosure Capacities for the
HDU-219 with Full Solar Load
Vendor Description Model
Number HDU-219 Doubler
Capacity
239 T1
Repeater
Capacity
Recommended
Slot
Assignment for
Maximum
Capacity*
AT&T Outdoor dual
chamber 819 4
p
er
chamber/8
total
25 1, 5,11, 14, 15,
18, 22, 25
AT&T Outdoor 841
cabinet 27A, B, C or D shelf 8
p
er
shelf/32
total
25
p
er
shelf/100
total
1, 5, 11, 14, 15,
18, 22, 25
AT&T Outdoor
cabinet 809 5 12 1, 5, 8, 10, 12
Alcatel Outdoor
canister, 621204 4 12 1,4, 8, 11
p
ole/wall
mount 621205 5 25 1, 4, 8, 11, 15
621206 7 50 1, 4, 14, 17, 27,
30, 36
Charles Outdoor
canister, CiAC4306 †2 6 1 or 5
p
ole/wall
mount CiAC3300 1 3 1 or 2
CiAC5312 4 12 1, 3, 7, 9
CiAC5325 5 25 4, 8, 12, 16, 18
CiAC5350 7 50 4, 8, 12, 16, 18,
20, 27
(Continued on following page)

December 22, 1997 Section 150-219-100-02
HDU-217/219 and HCC-239 List 1 Page 11
Table 3. Outdoor Enclosure Capacities for the
HDU-219 with Full Solar Load (continued)
Vendor Description Model
Number HDU- 439
Doubler
Capacity
239 T1
Repeater
Capacity
Recommended
Slot
Assignment
for Maximum
Capacity*
Sierra Outdoor
canister, 3011 2 6 3, 6
Sunrise
p
ole/wall
mount 3021 1 5 3
SPC Outdoor
canister, 7130- 08FP 2 8 4, 6
p
ole/wall
mount 7130- 12FP 4 12 1, 4, 7, 10
7130-
25FP 6 25 1, 4, 7, 10, 18, 28
†Re
q
uires removin
g
the metal slot se
p
arator.
* Slot numbers refer to the slots into which a doubler unit ma
y
be inserted to
access its four network cable pairs.
6Decrease any outdoor capacity by one for every four T1
repeaters, or fraction thereof, that are installed with the doublers.
7Decrease any outdoor capacity by one for every DDS or ISDN
repeater that is installed with the doublers.
8For all outdoor applications, decrease the capacity by one for
every two adjacent doublers that are not separated by at least one
empty slot.
Always provide as many empty slots between
doublers as possible.

Section 150-219-100-02 December 22, 1997
Page 12 HDU-217/219 and HCC-239 List 1
Table 4. Outdoor Enclosure Capacities for the
HDU-217 with Full Solar Load
Vendor Description Model
Number HDU- 217
Doubler
Capacity
DDS
Repeater
Capacity
Recommended
Slot
Assignment
for Maximum
Capacity
SPC Outdoor
canister,
p
ole/wall
mount
7130-0656 2 6 1, 6 or 3, 4
7130-0856 4 8 1, 4, 7, 16
7130-1656 6 16 1, 4, 7, 10, 13,
16
Adtran Outdoor
canister,
p
ole/wall
mount
LRH30AV
or
LRH30FV
1 2 1 or 2
LRH 11-
30AD or
LRH 11-
30FD
2 4 1, 4 or 2, 3
Sierra Outdoor
canister,
p
ole/wall
mount
3011 2 3 3, 6
Sunrise 3021 2 2 4, 6

December 22, 1997 Section 150-219-100-02
HDU-217/219 and HCC-239 List 1 Page 13
Installing and Removing the Cut-Through Card
When the dual-slot HDU-219 is inserted into a T1 enclosure, it blocks
access to the adjacent slot. In order to cut through the IN (CO side)
pairs to the OUT (field side) pairs of the blocked repeater slot for
downstream access, a HCC-239 (HiGain Cut-through Card) is
included with all HDU-219 List 1 doubler units shipped with the
Revision 02 practice. A block diagram of the HCC-239 is shown in
Figure 3. A special insertion tool (Figure 4), the HCT-239 (PairGain
part number 150-1595-01), that simplifies the HCC-239 installation
may be purchased from PairGain.
A package of 25 HCC-239 cut-through cards (PairGain
part number 150-1550-01) is also available if this cut-
through feature is needed in other doubler
installations.
To install the HCC-239 use the HCT-239 insertion tool (or long-nosed
pliers):
1Loosen the wing nut on the HCT-239 insertion tool.
2Slide the non-connector edge of the card into the tapered edge of
the insertion tool.
The HCC-239 card is symmetric, so the orientation is
irrelevant and the card cannot be plugged in
backward.
3Tighten the wing nut to firmly grip the card.
4Hold the tool near the end, and insert the card into the blocked
slot cavity.
5Carefully align the edge of the card with the slot edge connector.
6Push the card into the connector until it is firmly seated.
7Loosen the wing nut and remove the tool.

Section 150-219-100-02 December 22, 1997
Page 14 HDU-217/219 and HCC-239 List 1
To remove the HCC-239 card from the slot, proceed as follows:
1Grip the end of the tool and insert the tool into the slot cavity
containing the HCC-239 card.
2Carefully insert the tool hook into the removal hole in the card.
3Align the hook along the open side of the card edge connnector.
4Apply steady outward pressure, and gently remove the HCC-239.
Figure 3. HCC-239 Card Block Diagram

December 22, 1997 Section 150-219-100-02
HDU-217/219 and HCC-239 List 1 Page 15
Figure 4. HCT-239 Insertion Tool
Locating Doubler Unit Enclosures
The physical location of the doubler units is determined by the
following three deployment rules:
1Place the enclosures at the electrical limits, 35 dB, of each span.
This would place the first doubler at the 35 dB location and the
second at 70 dB. This allows the maximum circuit range of 105
dB to be realized, if the third span to the most distant remote unit
is also 35 dB.
2If rule 1 is not applicable (no customers 105 dB away), then try to
make all spans the same electrical length (same 196 kHz loss).
This minimizes the maximum span loss and assures maximum
operating margin, resulting in optimal transmission performance
on the HDSL cable pairs. If specific application constraints
preclude using rule 2, or, if two different circuit layout choices
have the same maximum span loss, then use rule 3.
3This rule minimizes the power consumption and dissipation of the
HLU that provides the doubler power. Rule 3 requires Span 1 to
be a minimum and Span 3 to be a maximum. This choice
minimizes the I2R loss in the cable pairs, and reduces the thermal
stress on the HLU.

Section 150-219-100-02 December 22, 1997
Page 16 HDU-217/219 and HCC-239 List 1
TESTING THE UNIT
Using Alarms
The HDU-217 and HDU-219 front panel contains one tri-color
STATUS LED. The light color and whether it is steady or flashing
provides you with the information listed in Table 5.
Table 5.Front Panel Status Indicator
STATUS LED Description
Flashin
g
g
reen
once per second S
y
nchronization is bein
g
attem
p
ted between the
HDU and the upstream (network) module.
Flashin
g
g
reen
more than once
per second
S
y
nchronization is bein
g
attem
p
ted between the
HDU and the downstream (customer) module.
Solid green HDSL frame s
y
nchronization has been achieved
between the HDU and both the u
p
stream and
downstream modules.
Flashin
g
red once
per second HDSL C
y
clic Redundanc
y
Check (CRC) error
has occurred between the HDU and the u
p
stream
module. See the "Fault Isolation" section of this
practice.
Flashin
g
red
more than once
per second
An HDSL CRC error has occurred between the
HDU and the downstream module. See the
"Fault Isolation" section in this practice.
Flashin
g
y
ellow
once per second A Network Doubler Unit (NDU) loo
p
back is in
effect in the HDU toward the network. This tests
the integrity of the upstream span.
Flashin
g
y
ellow
more than once
per second
A CDU (HDU to Customer) loo
p
back is in effect
in the HDU towards the customer. This tests the
integrity of the downstream span.