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