Positron Teleline Isolator 751239 Operating and installation instructions

Standalone HDSL Unit, 751239
Description and Installation

DOCUMENT CONTROL INFORMATION
Document Part Number: 924-010160-001, Rev 7
Publication Date: March 31, 2004
Document ID: o03kd000.fm
CONFIDENTIALITY NOTICE
The information contained in this document is the property of Positron Inc. Except as specifically
authorized in writing by Positron Inc., the holder of this document: 1) shall keep all information
contained herein confidential and shall protect same in whole or in part from the disclosure and
dissemination to all third parties, and 2) shall use same for operating and maintenance purposes only.
DISCLAIMER NOTICE
Although Positron Inc. has made every effort to ensure the accuracy of the information contained
herein, this document is subject to change without notice.
TECHNICAL CUSTOMER SUPPORT
Should a problem arise, contact your customer support department. If the problem cannot be resolved
by your support department or if you have any questions, contact Positron’s Technical Customer
Support department at 1-888-577-5254.
© 2004 Positron Inc.
Teleline Isolator is a registered trademark of Positron Inc.
Product names, other than Positron’s, mentioned herein may be trademarks and/or registered trademarks
of their respective companies.

Contents i
o03kd000TOC.fm
1. The Standalone HDSL Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Hardware Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6. Service and Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

(16 pages) Standalone HDSL Unit 1
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1. The Standalone HDSL Unit
The Standalone High-bit-rate Digital Subscriber line (HDSL) unit provides high
voltage isolation between one, four-wire Remote Terminal Unit (HTU-R) located
inside the substation, and an HDSL CO Terminal Unit (HTU-C) located at the
Central Office (CO).
The unit consists of an isolator card mounted inside a compact enclosure. The
enclosure is molded from fiberglass, making it a lightweight, flame retardant
container of high dielectric strength. Its fiberglass body limits the possibility of
many kinds of infiltration while providing reliable isolation from external ground
potentials.
The shelf is shipped with a 10’ insulated 12-conductor cable for connection to the
CO’s incoming cable and mounting hardware.
Its features include the following:
• The unit provides isolation 50 kVrms (70 kV peak) while maintaining full
communication between terminals.
• Communication is maintained across the gap by isolation transformers that
provide low-loss, low-distortion transmission.
• The unit does not require power from either the CO or an external supply to
operate.
• The enclosure resists the infiltration of dust, mist, and water from sprinklers.
• The card jumper settings enable you to configure the card to provide a
simplex sealing or a loop sealing return path on the CO side. The current will
not be transferred to the Station side. The card is shipped with these options
disabled.
For a view of the Standalone HDSL Unit enclosure, refer to Figure 1.
For a view of the Standalone HDSL Unit, cover open, refer to Figure 2.

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Figure 1 Model 751239 Enclosure
FRONT VIEW 11-5/16"
13-1/2"
DANGER
- DO NOT OPEN THIS COVER
UNLESS THE PROPER SAFETY
PRECAUTIONS ARE TAKEN
- THIS COVER MUST ALWAYS BE
CLOSED AS IT PROVIDES
THE NECESSARY SPECIAL
SAFETY INSULATION TO
PROTECT PERSONNEL FROM
DANGEROUS VOLTAGES
PRESENT DURING GROUND
FAULT CONDITIONS
CABINET USE RUBBER GLOVES
AND INSULATED CARPET
- WHEN WORKING IN THE
POSITRON
GROUND
LUG
SIDE VIEW 5- 9/16"

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Figure 2 Model 751239 Cover Open (Only Major Components
Shown)
GND LUG
ISOLATION
GAP
5¼"
1
TB2
1
TB1
STATION SIDE
CO SIDE
ISOLATION
TRANSFORMER
ISOLATION
TRANSFORMER
C8
W3 W4
C5
W1 W2

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2. Applications
The applications of the Standalone HDSL Unit include the following:
• HDSL lines
• Data transmission lines within the passband of the card
For an illustration of the unit’s application, refer to Figure 3.
Figure 3 High Voltage Interface Application
Standalone HDSL
Unit
Model 751239
Communications Cable
300 Volt
Point
300 Volt
Point
300 Volt
Point
Zone of Influence
Metal
Conduit
PVC
Conduit
CENTRAL OFFICE
HIGH VOLTAGE INTERFACE
SUBSTATION
HTU-R
Lightning
Arrestor

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3. Hardware Description
The Standalone HDSL Unit contains a Plug-in HDSL card. This card is
comprised of two sides. The Station side is located on the upper portion of the
card and the CO side is located on the lower portion of the card. The Station side
is separated from the CO side by the isolation transformers which create a 5¼
inch isolation gap. For the unit’s block diagram, refer to Figure 4.
Figure 4 Block Diagram

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4. Technical Specifications
For a listing of the unit’s electrical specifications, refer to Table 1. For a listing of
the unit’s physical specifications, refer to Table 2.
Table 1 Electrical Specifications (measured at 77°F or 25°C,
50% R.H.)
Parameter Specifications
ISOLATION DATA
Isolation resistance 100 000 MΩ
Metallic surge 3 kV maximum
Insulation voltage 50 kVrms (70 kV peak)
INPUT VOLTAGE REQUIREMENT None
TRANSMISSION DATA
Longitudinal balance (CO side) >80 dB @ 60 Hz; >60 dB @ 300 to 40 kHz
Return loss at either side with opposite side
terminated at135 Ω
>25 dB, 1KHz to 750 kHz
NOISE
2 to 100 Hz -60 dBm
Voice band (C weighted message) < 2 dBrnc
Impulse noise Less than 1 count above 48 dBrnc in 30
minutes
SIGNAL
Insertion loss (@ 350 kHz, 0 dBm) < 0.5 dB
Frequency response (2 kHz to 750 kHz) ±3 dB relative to 350 kHz

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Table 2 Physical Specifications
Parameter Specifications
Operating temperature range -4°F to +149°F (-20°C to +65°C)
Height 13-1/2” (34.3 cm)
Width 11-5/16” (28.7 cm)
Depth 5-9/16” (14.1 cm)
Weight 8.3 lbs (3.8 kg)

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5. Installation
The Standalone HDSL Unit is used when the number of lines to be isolated does
not justify the installation of a shelf. It will isolate one full HDSL line (two
pairs), or two half HDSL lines, provided that there is no metallic current.
Caution
• Stand on a thick rubber mat and wear rubber gloves during the
installation procedure. It is preferable to perform these procedures on a
clear dry day when a Ground Potential Rise (GPR) or transients are less
likely to occur.
• The station and CO cables should be kept at least six inches apart upon
wiring in order to prevent an electric arc between the two in the event of
damage to, or degradation of their insulation.
1. Verify that you have the following customer supplied tools and hardware,
which are required to install the unit:
• Station cable
• Center punch
• Electric drill with a 5/32” diameter bit
• 7/16” hex wrench
• 1/8” and 1/4” common blade screw drivers
• Phillips screwdriver
• 1” thick plywood backboard with appropriate mounting hardware
• Cable clamps and mounting hardware for routing cables exterior to the shelf
(quantity determined by the cable lengths involved).
2. Unpack the Standalone HDSL Unit and its installation hardware from its
protective box.

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3. Check the contents of your Standalone HDSL Unit kit. For a listing of the
items included in the kit, refer to Table 3.
Table 3 Model 751239 Kit Contents
4. Confirm that the isolation unit is a Standalone HDSL Unit by identifying
the name located inside the cover and the model number on a metallic label
on the top of the righthand portion of the unit.
5. Set W1 to W4 according to your application. The default setting does not
provide for simplex or loop sealing currents. If your circuit does require
simplex or loop sealing currents, change the jumper settings accordingly.
For a view of the possible jumper settings, refer to Figure 5.
Items Included Qty Part Numbers
Standalone HDSL Unit 1 244-751239-401
Description and Installation document 1 924-010160-001
“Danger” label (already affixed) 1 7501-02-103
One-card Shelf, four-wire, accessory kit 1 241-751202-401
10’ insulated cable (12-conductor) 1 207-990000-138
Connector cord grip (1/2” hub) 1 230-990400-027
Connector cord grip (1/2” hub) 1 230-990400-038
Instruction sheet, strain relief 1 241-010006-001
Label, white 1 612-990000-034
Terminal block (0.2”) 2 666-990000-059
Hex nut, 1/2-14NPT 2 714-990000-005
Hex screw with washer (#14A) 4 724-990000-011

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6. Fasten the 1” thick plywood backboard to the wall, and mount the enclosure
on it using the four screws supplied.
Note
The Station (subscriber) side of the enclosure is the side connected to the
external ground lug. The orientation of the unit does not matter.
7. The strain reliefs supplied each have a cable entry diameter appropriate to
one of the two cables employed in this installation. The CO cable strain
relief is the largest, accommodating a cable diameter from 0.375” to 0.570”.
The station cable strain relief accepts a cable diameter from 0.125” to
0.275”. (All measurements are the outside cable diameters).
?Slide the strain reliefs supplied onto the CO and station cables and affix
them to the unit.
?Route the two telephone cables, allowing a length of five inches per cable
for the internal connections to the terminal blocks. Cut the excess wire once
the exact internal length is established, and tighten the strain reliefs.
?Strip back the outer jacket of each cable one inch. Strip the inner insulating
jacket of each conductor 1/8”. Connect these stripped conductors to the
designated terminal locations. To locate the connectors, refer to Figure 2.
For a listing of the terminal block connections, refer to Table 4.
Table 4 Terminal Block Connections
Cable Signal Color Coding Connector
Position
Station DTU (A)
DTU (A)
N/C
DTU (B)
DTU (B)
Customer determined
Customer determined
Customer determined
Customer determined
TB1-1
TB1-2
TB1-3
TB1-4
TB1-5
CO DTU (B)
DTU (B)
N/C
DTU (A)
DTU (A)
Any of the available
12 conductors
TB2-1
TB2-2
TB2-3
TB2-4
TB2-5

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?Bundle the cable conductors with tie wraps.
?Ensure that there are no excess wires dangling into the isolation gap
between the Station and CO side circuits. Then close and secure the shelf
cover with the captive screws.
8. Verify the installation by establishing communication.
Figure 5 Jumper Settings
C8
W3 W4
C5
W1 W2
C8
W3 W4
C5
W1 W2
C8
W3 W4
C5
W1 W2
1
2
3

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6. Service and Support
Technical Customer Support
Positron is committed to providing excellent ongoing technical support to its
customers. A team of specialists is always available at our Technical Support
Center in Montreal for either telephone consultations or on-site visits, to assist
Field Technical personnel in the maintenance and troubleshooting of Positron
equipment. During normal business hours, (8:30 a.m to 5:00 p.m. EST), any one
of our Technical Customer Support (TCS) staff may be reached by dialing
1-888-577-5254 from anywhere in the continental United States or from Canada.
Customers outside North America should dial 1-514-345-2200. Staff may also be
contacted via fax at 514-345-2271 or e-mail at [e-mail].
Positron TCS staff are available to provide technical assistance and/or to
supervise the installation of Positron equipment. Assistance in the planning,
configuration, and implementation of the installation will be provided as
requested. Arrangements and pricing information regarding field assistance may
be obtained by contacting the Technical Customer Support department. Please
contact Positron for scheduling at least four weeks prior to the actual requested
visit date.
Customer Training
Positron offers full customer training courses, as requested. Seminars are also
available on High Voltage Interface (HVI). For more information, contact a
customer representative by dialing 1-888-577-5254 or use our e-mail address,
[email protected].
Warranty
Positron warrants that all equipment shall perform in accordance with Positron's
specifications. The warranty remains valid for five (5) years from the date of
shipment. The warranty will be honored provided that the equipment has not
been abused and provided that the equipment has been installed and used in
accordance with Positron's installation instructions and specifications. The
warranty fully covers workmanship, materials and labor.
This warranty is in lieu of all other warranties, whether expressed or implied,
including warranties of merchantability and fitness for a particular purpose.
Positron guarantees that all equipment shall perform in accordance with
Positron's specifications. Positron disclaims any warranty that Positron

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equipment will meet customer requirements beyond the product specification.
Positron disclaims any warranty that operations will be uninterrupted or error
free.
Repair Service
Positron Inc. offers repair services by which customers can count on timely and
quality repairs, regardless of customer location.
All warranty repairs are performed at no cost. Positron reserves the right to repair
or replace any equipment which has been found to be defective.
For information about out-of-warranty repairs, contact Positron’s Repair
department at 1-800-661-4911 (from anywhere in the continental United States
or from Canada) or dial 514-345-2228. Due to the varied nature of repairs, no
one time frame for turnaround can be guaranteed. However, average turnaround
time is two weeks from date of receipt. In emergency situations, special
arrangements can be made by contacting our Repair department. All repaired
items are warranted for a period of 90 days. Bulk repairs (more than five items)
will require additional processing time, therefore, please take this into
consideration when requesting a Return Material Authorization (RMA) number.
Before returning any items to Positron for repair, warranty repair or replacement,
call the Repair department to obtain an RMA number. Parts returned without
RMA numbers cannot be accepted. The RMA number must always be clearly
marked on all boxes and crates and on all shipping documents.
Items under warranty are to be shipped prepaid to Positron and will be returned
prepaid to the customer. Items that are not under warranty are to be shipped
prepaid to Positron and will be returned prepaid with freight charges included on
the invoice. Positron cannot accept items shipped collect. A purchase order
number is required for all repairs.
To accelerate the repair process, whenever possible, customers should include a
report detailing the reason for return with the unit(s) being returned. Also, please
include the name and phone number of a person who can be contacted should our
Repair department need further information.
When packing items being returned for repair, please ensure that the item(s) is
properly packed to avoid further damage. Teleline Isolator cards should never be
shipped while installed in a shelf; this will cause damage and will almost
invariably extend the repair period.

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Ordering Information
Positron’s Teleline equipment can be ordered by telephone, facsimile, or by mail.
All orders should be directed to the Positron Inside Sales department. Ordering
by telephone, or facsimile will eliminate any delays arising from postal services.
However, a hard copy purchase order is required as a confirmation. In addition to
the model numbers of the items being ordered, the following information is
required:
• Company name, contact name and telephone number
• Purchase order number
• “Ship To” address
• “Bill To” address
• Date required on site
All orders must be followed by a confirming order. Equipment will not be
shipped until such confirmation is received.
For a list of our contact information, refer to Table 5.
Table 5 Positron Contact Information
Address Positron Inc.
5101 Buchan St.
Montreal, Quebec, Canada
H4P 2R9
Main telephone number 514-345-2200
Customer Service department telephone
number
514-345-2200, 1-888-577-5254
General e-mail address [e-mail]
Customer Service department fax number 514-345-2271
TCS department toll-free number 1-888-577-5254
TCS department fax number 514-345-2271
TCS department e-mail address [e-mail]
Repair department telephone numbers 514-345-2228 or 1-800-661-4911
Customer representative e-mail address [e-mail]