Guardian DTT Owner's manual

7552 - 10th Street N.E. Calgary, Alberta, Canada T2E 8W1
Industrial Communications Worldwide
Ph: 403.258.3100 \ email:[email protected] \ www.guardiantelecom.com
Industrial Desk Telephone
Model DTT
Installation and Operation
P005616 Rev. B 070815 7/21/2014 1:31 PM

Guardian Telecom Inc
Installation and Operation
Model DTT
Page 2
Table Of Contents
Package Contents ................................................................................2
Models ..................................................................................................2
Options .................................................................................................2
Accessories ..........................................................................................2
Overview...............................................................................................3
Features................................................................................................3
Installing the DTT Telephone................................................................6
Field Repairs & Adjustments.................................................................7
Description Of Features........................................................................8
Engineering Specifications....................................................................9
Replacement Parts .............................................................................10
Government Certification....................................................................11
Warranty .............................................................................................12
Disclaimer...........................................................................................12
Warning ..............................................................................................12
Service Telephone Number................................................................12
Feedback............................................................................................12
Guardian Product Return....................................................................13
Table Of Figures
Figure 1 - Dimensions...........................................................................4
Figure 2 - Wall Mounting.......................................................................4
Figure 3 - Internal Wiring ......................................................................5
Figure 4 - Mechanical Assembly...........................................................5
Package Contents
(1) DTT Industrial Telephone
(1) Installation & Operation Manual
Models
P6580 Standard model with 6’ heavy duty curly cord, membrane keypad with receiver
volume control Options
Noise Canceling Microphone (NC)
Accessories
P7225 Weatherproof ring detect relay
P7232 Weatherproof off-hook detect relay
PXXXX External Loud Ringers and Strobe Lights

Guardian Telecom Inc
Installation and Operation
Model DTT
Page 3
Overview
The DTT Desk Telephone is designed to provide safe, reliable communication in Industrial locations.
The unit is housed in a rugged enclosure which makes it ideal for use in harsh environments.
The DTT can be wall mounted if desired.
Features
Enclosure
housing - 16 Gauge steel - Zinc Dichromate plated and powder coated
faceplate – Kydex or ABS-94-V0 fire rated, durable and easy to clean
Membrane Keypad
weather tight
10 number memory
Redial - last number (up to 31 digits)
Recall – obtains dial tone without hanging up handset
Flash - 600ms timed loop break
Pause - 3 second pause in programming
Mute - disables handset microphone
Softer/Louder – 2.7 dB step per press (+8.1dB/-5.4db in 5 steps)
Epoxy Resin Circuitry Coating
encapsulates circuit boards and all of its electronics making it resistant
to corrosive agents (e.g. H
2
S, SO
2
, and NH
3
), and environments with
high humidity
Magnetic Reed Hook Switch
no moving parts
Surge Arrestor and Fuse
safeguards the electronic circuits and the user in the event of a high
voltage spike on the telephone line
Noise Reducing Microphone
allows a high level of intelligibility in locations with high background
noise
Tone (DTMF)/Pulse Operation
factory set for tone (DTMF) dialing
pulse dialing can also be ordered or configured in the field
Heavy Duty Handset Cord
withstands severe use
Hearing-Aid Compatible
compatible with inductively coupled hearing-aid devices
Receiver Volume Control
Switch on keypad provides 13.5dB of range

Guardian Telecom Inc
Installation and Operation
Model DTT
FRONT VIEW
9.3 [237]
5.9 [149]
WALL MOUNT VIEW
7.8 [199]
8.1 [205]
Figure 1 - Dimensions
Figure 2 - Wall Mounting
Page 4
4.4 [113]
1.5 [37]
0.6 [16]
4 PLCS.
4.6 [117]
Ø0.19

Guardian Telecom Inc
Installation and Operation
Model DTT
Figure 3 - Internal Wiring
Figure 4 - Mechanical Assembly
Page 5
GREEN FOR GROUND
BLACK AND WHITE FOR TIP AND RING
CABLE: 3 COND. 60CY 300V 14AWG
CABLE GLAND
CLASS I DIV. 2
CHASSIS
BRACKET
MOUNTING
HANDSET COVER
TELEPHONE
FRONT
RING
GROUND
TIP
SURGE ARRESTOR
RINGER
FUSE
REED SWITCH
TELEPHONE
CIRCUIT BOARD
TONE/PULSE
JUMPER

Guardian Telecom Inc
Installation and Operation
Model DTT
Page 6
Installing the DTT Telephone
Follow all appropriate electrical codes and use only approved electrical
fittings for the installation. See: Government
Certification.
To change the Tone/Pulse setting to pulse, if required: Tip: The DTT is factory
preset for DTMF tone.
oRemove the four top screws and carefully remove the cover.
oMove the jumper from pins 1 & 2 of the Tone/Pulse connector to
pins 2 & 3.
oTo change the setting back to tone move the jumper back to
pins 1 & 2.
oReplace the cover and the four screws.
Note: The model DTT can be either desk mounted or wall mounted. See: Figure 2 - Wall
Mounting
If the DTT is to be desk mounted simply place it in the desired location.
If the DTT is to be wall mounted follow these instructions. See: Figure 3 - Internal
Wiring
oRemove the four top screws and carefully remove the cover. See: Figure 4 -
Mechanical Assembly
oDisconnect the harness plugs and set the cover aside.
oUsing a flat screwdriver or similar instrument carefully pry the chassis
away from the base at the four corners.
oLoosen the locknut on the forty-five degree cable gland, rotate the
gland 180 degrees and re-fasten the locknut.
oSecure the base to the wall at the desired location.
oRotate the chassis 180 degrees from the original orientation and snap
it back into the base.
oRotate the cover 180 degrees from the original orientation and
reconnect the harness plugs.
oReplace the cover and the four screws.
Ensure that none of the electrical connection circuits are live.
Connect the Tip, Ring and Ground conductors in the cable provided to the
telephone line at a junction box. Note: Tip and Ring are
not polarity sensitive.
Test the unit by calling to and from another unit on the exchange.

Guardian Telecom Inc
Installation and Operation
Model DTT
Page 7
Field Repairs & Adjustments
Field repairs may only be carried out by qualified technicians using OEM parts.
Substitution of parts voids warranty and may pose a hazard to users of the
equipment.
See: Figure 3 - Internal
Wiring and Replacement
Parts
Disconnect the telephone from Tip and Ring power supplied by the PABX
or central office before attempting repairs.
Remove the four top screws and carefully remove the cover.
Perform the necessary repairs or adjustments.
See: Figure 4 -
Mechanical Assembly
Replace the cover and the four screws.
Fuse Replacement
Remove the old fuse by pulling on the ends of the fuse holder to open.
Insert a new 0.25 amp, 250Volt, 3AG fast blow fuse and close the fuse
holder.
Note: Ensure that
connections are secure
before replacing the
cover.
WARNING!
Replace only with a 0.25 amp 250V 3AG fast blow fuse. Failure to do so
will void the warranty.
If, on reconnecting power, the fuse fails, check the telephone system
wiring. The fuse protects the Tip and Ring line from the telephone system.
It is usually powered at 48 volts DC and must not be connected to 120 volts
AC.
Changing the Tone/Pulse Setting
Set the Tone/Pulse jumper for the desired operation. For pulse, set the
jumper between the center pin and the “P”, for tone set it between the
center pin and “T”.
See: Figure 3 - Internal
Wiring

Guardian Telecom Inc
Installation and Operation
Model DTT
Description Of Features
Flash:
The flash button will invoke a 600 ms timed loop break. In pulse dialing mode the flash option is
inoperable.
Recall:
The Recall button is used to disconnect the line without replacing the handset in the cradle.
Softer and Louder:
The Softer and the Louder buttons are used as a volume control for the receiver earpiece. Each
press on the Softer or Louder button will decrease or increase the loudness by 2.7 dB (+8.1 dB/-
5.4 dB in 5 steps).
Mute:
The function of this key is enabled in speech mode only. Pressing the Mute key will disable the
microphone amplifier, and pressing the Mute key again will revive the microphone amplifier.
Redial:
The Redial button will recall the last manually dialed number. The maximum storage capacity of
the Redial Memory is 31 digits.
Pause:
Pause is used during programming to insert a 3 second pause within the first 5 digits.
Memory key programming:
There are 10 direct memory access registers which can be assigned to
the 10 numeric keys. Each register can contain up to 20 digits including
Pauses.
To program the direct memory access keys proceed as follows.
Page 8
 Take the phone OFF HOOK.
 Press the Program key. The phone is now in programming mode.
 Press the Memory key and one of the numerical keys (0-9). The
number selected will be assigned to this memory location.
 Enter the phone number to be stored (for example 1-800-363-8010).
Valid entries are 0-9, *, #, or Pause. If you are located in a business
where you must dial 9 or some other digit(s) to access an outside
line, the example above would be 9 Pause (press the Pause key) 1-
800-363-8010.
 Press Enter to exit the programming mode.
Automatic memory Dialing:
Ten (10) preprogrammed direct memory access registers can be used
for quick dialing as follows:
 Take the phone OFF HOOK.
 Press the Memory key.
 Select one of the numerical keys (0-9) (the memory locations).
 The number stored in the register will be accessed and dialed.

Guardian Telecom Inc
Installation and Operation
Model DTT
Page 9
Engineering Specifications
Electrical Performance
A UDIBLE R ANGE F REQUENCY R ESPONSE 300 – 3400 H Z
D IALING M ETHOD DTMF OR 40/60 P ULSE AT 10 PPS
T RANSMIT O BJECTIVE L OUDNESS R ATING (TOLR) -38 +/- 3 dB
R ECEIVER V OLUME A DJUSTMENT 3 S TEPS U P / 2 S TEPS D OWN (8.1 dB / 5.1 dB)
R ECEIVE O BJECTIVE L OUDNESS R ATING (ROLR)
-A T N OMINAL V OLUME L EVEL 50 +/- 3 dB
-A T M AXIMUM V OLUME L EVEL 42 +/- 3 dB
-A T M INIMUM V OLUME L EVEL 55.5 +/- 3 dB
S IDE T ONE O BJECTIVE L OUDNESS R ATING (SOLR)
-A T N OMINAL V OLUME L EVEL 11 +/- 4 dB
-A T M AXIMUM V OLUME L EVEL 7 +/- 4 dB
-A T M INIMUM V OLUME L EVEL 14 +/- 4 dB
M EMORY D IAL 10 R EGISTERS OF 20 D IGITS E ACH
F LASH 600 mS T IMED D ISCONNECT
M UTE P RESS K EY TO M UTE T RANSMITTER
R EDIAL 31 D IGITS M AXIMUM
R INGER O UTPUT M AX 75 dB
FCC R INGER E QUIVALENCE 0.9B
S ET I MPEDANCE 600 O HMS N OMINAL
M AXIMUM L OOP 15,000 FT (4,600 M ) OF 22 AWG C OPPER
Electrical Requirements
R INGER S ENSITIVITY 40 – 100 V, 16 – 25 H Z
L INE V OLTAGE 24 – 56 VDC
L OOP C URRENT 20 - 120 mA
C ONNECTION M ETHOD 8’ (2.4 M ) C ABLE TO S URGE A RRESTOR IN P HONE
F USE ¼ A MP 250 V OLT 3AG F AST B LOW
Environmental
T EMPERATURE -40
O
TO +60
O
C (-40
O
TO +140
O
F)
H UMIDITY 0 TO 95% RH
D USTPROOF F ULLY G ASKETTED E NCLOSURE

Guardian Telecom Inc
Installation and Operation
Model DTT
Page 10
Mechanical
H OOK S WITCH (C RADLE S WITCH ) L IFE >1 000 000 O PERATIONS
H OUSING 16 G AUGE S TEEL , Z INC D ICHROMATE P LATED A ND P OWDER C OATED
F ACEPLATE K YDEX OR ABS-94-V0 F IRE R ATED
D IMENSIONS (H X W X D) 9.3 x 7.9 X 5.9 inches (237 x 199 X 149 mm)
N ET W EIGHT 5.5 LBS (2.5 KG )
H ANDSET M ATERIAL H IGH I MPACT ABS
M ICROPHONE N OISE R EDUCING E LECTRET
R ECEIVER H EARING A ID C OMPATIBLE
S TANDARD M OUNTING D ESK O R W ALL
C ONNECTION F ITTINGS Cable Gland
H ARDWARE M ATERIAL S TAINLESS S TEEL
Compliance
I NDUSTRY C ANADA 1012 6721 A
FCC HQHCAN-22517-TE-E
Replacement Parts
Part No. Description
P004354 Faceplate DTT
P002294 Handset Shell Only
P000028 Microphone Cartridge – Noise Reducing
P002080 Receiver Cartridge
P004323 Handset Assembly – C/W 10’ curly cord
P005582 Telephone Circuit Board
P005224 Keypad – membrane
P002782 Ringer – Floyd Bell BR-3-39
P002254 Reed Switch
P002992 Surge Arrestor – TII 126L1
P002991 Fuse – Glass 0.25 Amp 250V
P004353 Housing DTT

Guardian Telecom Inc
Installation and Operation
Model DTT
Page 11
Government Certification
Attached to the telephone are labels for Industry Canada and the United States Federal Communications Commission. These identify
equipment certifications indicating the 60 and 70 series telephones meet certain telecommunications network protective, operational
and safety requirements. These agencies do not guarantee the equipment will operate to the user's satisfaction.
Before installing this telephone equipment, users should ensure it is permissible to connect the equipment to facilities of the local
telecommunications company.
Equipment must be installed using acceptable connection methods. In some cases, the telephone users inside wiring, associated with
a single line service, may be extended by a certified connector assembly (telephone extension cord). The customer should be aware
that in some situations compliance with the above conditions may not prevent degradation of service.
Repairs to certified equipment should be made by a supplier designated authorized maintenance facility.
For their own protection users should ensure the electrical ground connections of the power utility, telephone lines and internal
metallic water pipe systems, if present, are connected. This precaution may be particularly important in rural areas.
CAUTION: Users should not attempt to make ground connections, but should contact the appropriate electrical inspection authority
or electrician.
Load Number (LN)
The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop
used by the device. Termination on a loop may consist of any combination of devices subject only to the requirement that the total of
the Load Numbers of all the devices does not exceed 100.
Notification to Telephone Company
Upon request, the customer must notify the telephone company of the particular line to which the connection will be made and provide
the Industry Canada or FCC registration number. The local telephone company may request disconnection of the telephone where
alterations or malfunctions affect the telephone’s performance.
United States Federal Communications Commission
This equipment generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause interference to radio communications. It has been tested and found to comply with the limits for Class
A computing device pursuant to Subpart J of Part 15 of FCC rules, which are designed to provide reasonable protection against such
interference when operated in a commercial environment. Operation of this equipment in a residential area is likely to cause
interference in which case the user, at his own expense, will be required to take whatever measures may be required to correct the
interference.
Interference
There is no guarantee that interference will not occur in a particular installation. If interference to radio or television reception from this
equipment is suspected, proceed as follows:
1. Unplug the set, check for the interference.
2. Re-orient the receiving antenna.
3. Relocate the set with respect to the receiver.
4. Move the set away from the receiver.
If necessary, consult the supplier or an experienced radio/television technician for additional suggestions.
FCC Rules and Ringer Equivalence Number
This equipment complies with Part 68 of the FCC Rules. On the side of this equipment is a label that contains, among other
information, the FCC registration number and ringer equivalence number (REN) for this equipment. If requested, this information
must be provided to the telephone company.
The REN is used to determine the quantity of devices which may be connected to the telephone line. Excessive RENs on the
telephone line may result in the devices not ringing in response to an incoming call. In most, but not all areas, the sum of the RENs
should not exceed five. To be certain of the number of devices that may be connected to the line, as determined by the total RENs,
contact the telephone company to determine the maximum REN for the calling area.
Service changes and Limitations
The telephone company may make changes in its facilities, equipment, operations, or procedures that could affect the operation of the
equipment. If this happens, the telephone company will provide advance notice in order for you to make the necessary modifications
in order to maintain uninterrupted service.
This equipment can not be used on public coin telephone service as provided by your telephone company. Connection to party line
service is subject to state tariffs (contact the state public utility commission, public service commission or corporate commission for
information.)

Guardian Telecom Inc
Installation and Operation
Model DTT
Page 12
Warranty
Guardian Telecom warrants your product to be free of defects in material and workmanship for a period
of one year. Guardian Telecom will repair or replace any defective unit that is under warranty free of
charge.
This warranty is null and void if any non-authorized modifications have been made to this product, or if
it has been subjected to misuse, neglect, or accident. This warranty covers bench repairs only; such
repairs must be made at Guardian Telecom or an authorized service depot. Guardian Telecom is not
responsible for costs incurred for on-site service calls, freight, or brokerage.
A return authorization must be obtained prior to warranty claims or repairs.
Disclaimer
The products covered by this manual are designed for use in Industrial Environments and/or Hazardous
Locations. Due to the range of possible applications for these instruments the manufacturer will not be
responsible for damages or losses of any kind suffered as a result of the use of this product, including
consequential damages.
Warning
This device may be opened and reassembled by qualified personnel only, for the purposes of installing
the product, making adjustments and replacing components, following the instructions in the product
manual.
High voltages may be present in this product when connected to telephone wiring.
Service Telephone Number
1-800-363-8010
Guardian Telecom provides a customer service telephone number which is toll-free within North
America. If you need assistance when installing or operating this product, please call the toll-free
telephone number between regular business hours (8:00AM-5:00PM), Mountain Standard Time. If you
are calling outside of regular business hours, please leave a detailed message, and a member of
Guardian Telecom’s Service Department will return your call as soon as possible. If your product
requires service, Guardian personnel will supply you with an RMA (return materials authorization)
number over the telephone or through our web site product return page. This number must be included
with your return address and the name of the person to contact.
Guardian Telecom Inc.
7552 - 10th Street N.E.
Calgary, Alberta, Canada T2E 8W1
Toll-free 1-800-363-8010
Ph. [phone]
Fax. [phone]
www.guardiantelecom.com
Feedback
Guardian Telecom continually strives to make reliable, durable, and easy to use products. If you, as an
installer or user of our equipment, have any suggestions for improvements to this or any of our products
or documents, including this manual, we would appreciate hearing from you.

Guardian Telecom Inc
Installation and Operation
Model DTT
Page 13
Guardian Product Return
Guardian products have been quality tested and are in full working order when shipped from
the factory, given the rugged nature of these products shipping is not expected to damage a
unit. In the unlikely event of a malfunction, Guardian follows the three step procedure below.
Step I - On-Site Correction
 The most common source of difficulties with a new product is improper installation in one of
two ways: incorrect wiring connections or connection to an incorrect power source.
 Product wiring needs to be properly connected to the on-site wiring. Correct wiring
instructions are shown in the user manual included with the product.
 Connecting a telephone to a standard power source, rather than tip & ring, will blow the
telephone’s internal, user-replaceable fuse. In the event of fuse burn-out, disconnect the
telephone from the power source, replace the fuse, and reconnect following the wiring
diagrams provided with the product.
Step II - Return Materials Authorization (RMA)
 When a product has been installed following user manual instructions, and the unit fails to
operate, the user must contact Guardian Telecom to obtain authorization to return the
product. This can be done by completing a RMA form online at
www.guardiantelecom.com, or by calling the service telephone number given in this
manual.
 After providing information on the product, the owner and the nature of the problem,
Guardian will issue a RMA number, to be shown on documentation returned with the
product.
 In addition to the RMA number, shipping documents should include name, address and
telephone number of the owner along with contact information for the person responsible
for the repair and/or the user who identified the malfunction.
 (Where a product is being returned for repair from outside of Canada, customs
documentation must show the product’s serial number, date of export [date of purchase],
and a notation that the equipment is: “Canadian goods returning.”)
Step III - Factory Authorized Service
 Once received, each product is carefully inspected and tested. If the product is under
warranty, repairs are completed and the product returned to the owner, generally within
five working days of receipt by the factory.
 A product that has been subjected to misuse, neglect or accident or is beyond the warranty
period will be evaluated. The service department will provide the owner’s representative
with a repair cost estimate. Once approved, repairs are completed and the product
returned, generally within five working days.

Guardian Telecom Inc
Installation and Operation
Model DTT
Page 14
Notes:
Model No.
Part No.
Serial No.
Date of Purchase

Guardian Telecom Inc.
7552 - 10th Street N.E.
Calgary, Alberta, Canada T2E 8W1
Toll-free 1-800-363-8010
Ph. [phone]
Fax. [phone]
www.guardiantelecom.com
E-mail: mailto:[email protected]
(Click to open message box)
Industrial Communications Worldwide
© Guardian Telecom Inc. 2007