DCB PTT24 User manual

PTT24
Manual
Copyright 2016 All rights reserved.
Manual version 1.0, Firmware version 1.0
All trademarks and trade names are the properties of their respe tive owners.
July, 2016
Manual Version 1.0, Firmware 1.0

TABLE OF CONTENTS
Chapter 1
Introduction............................................................................................1
Pa kage Contents...........................................................................................2
Software Requirements..................................................................................2
Chapter 2
Installation..............................................................................................3
Overview...................................................................................................3
Installation and Configuration......................................................................4
1. Ra k Mounting ...........................................................................................4
2. Cabling........................................................................................................4
12 and 24 Port able referen e..................................................................5
3. Sele t 12 or 24 ports...................................................................................6
4. Chassis grounding......................................................................................6
5. Power onne tions......................................................................................7
6. Alarm onne tions .....................................................................................7
7. Sele t ontrol hannel................................................................................7
8. Push button test.........................................................................................8
Chapter 3
Testing......................................................................................................
Overview......................................................................................................... 9
Field Testing...................................................................................................9
Appendix A
Specifications..........................................................................................10
Spe ifi ations............................................................................................10
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Chapter 1
Introduction
This chapter provides an overview of features and capabilities.
he PTT24 is a Push-to-Talk lo kout devi e. It is used with multiple E&M ir uits linked to
radio transmitters, PBXs, et . The PTT-24 solves the problem of E&M leads being lo ked
into a Transmit ON state when a T1 ir uit fails. Many T1 trunk lines will go into a busy
ondition when the T1 trunk fails. This auses the E&M leads to lo k in an ON state, whi h
auses radio transmitters to lo k in the ON state, tie lines to go off hook, et .
T
12 or 24 E&M ports are wired through the PTT Lo kout unit. A front panel toggle
swit h is used to sele t 12 or 24 port operation. A 2 digit push button swit h is used to sele t
the E&M DS0 ontrol hannel. The Power LED flashes if an invalid ontrol hannel number
is sele ted.
Based on the sele ted E&M DS0 ontrol hannel (via the front panel) the PTT
Lo kout devi e will dete t a losure to ground on that hannel and de-assert all the other
hannels. E&M Type III is not supported.
In the PTT-24 12 hannel mode, sele ting ontrol hannel 1 through 12 will sele t one
of the even numbered leads 26 though 48 as the ontrol hannel. The other 11 even
numbered leads will be de-asserted if the ontrol hannel is asserted. All other leads are
passed straight through.
In the PTT-24 24 hannel mode, sele ting ontrol hannel 1 through 24 will sele t one
of the leads 26 though 49 as the ontrol hannel. The other 23 leads will be de-asserted if the
ontrol hannel is asserted. All other leads are passed straight through.
If the PTT-24 were to lose power, the E-leads will be in a pass through mode as
though the PTT-24 is only a “lump in the able”.
Lo kout an be triggered by the E&M ontrol hannel being a tivated or the alarm
input. For both the ontrol hannel and the alarm input, there is a delay of 20 millise onds
before the lo kout o urs. The de-a tivation delay is 5 se onds. The de-a tivation delay
eliminates lo kout “ hattering” on/off/on/off, et .
Leads 1 through 24 and 50 of the 50 pin Amphenol tel o onne tors are passed
straight through from the hannel bank to the transmitter. The PTT24 does not impa t these
leads in any way.
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Package Contents
You should find the following items pa kaged with your PTT24:
The PTT24 ra k mount unit with power and alarm onne tors
4 plasti able tie mounts and 4 4-40 x 1/4” s rews
2 filler spa ers used under the 4 #10-32 x 3/8” panel mount fasteners
Manual
Optional: 1 - 9802012 PC Dire t adapter, 1 – 9500023 green network management
able
Software Requirements
Ex ept for testing there is no need for any software to onfigure or operate the PTT24. Using
the PTT24 RS232 port requires removing the top over to a ess the management port
lo ated inside the unit. Ex ept for testing it should never be ne essary to a ess this port in
the field.
To use the RS232 port, use the supplied green network management able (6500023) and the
PC dire t adapter (9802012) to onne t to a terminal or PC. The management port is 9600
bps, 8 data bits, no parity. No spe ial terminal type is required. Either a “dumb terminal
mode” or a VT terminal type should suffi e. Hypterterm, TeraTerm, Putty are examples of
suitable terminal software.
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PTT24 Manual
Chapter 2
Installation
This Chapter details the installation process .
Overview
The PTT24 is a 1U high by 19” ra k mount unit. Installation and onfiguration of the PTT24
PTT24 ront Panel
PTT24 Rear Panel
3

Installation: Channel Bank, Transmitter, Power, Alarm, Ground
1. Rack mount the PTT24
The PTT24 is shipped with 4 mounting s rews and 2 re tangular spa ers. The spa ers prote t
front panel from being bent or s rat hed by the mounting s rews.
2. Cable the Channel Bank to the PTT24
Standard straight through 50-pin male to female tel o ables are used to onne t to the
PTT24. The PTT24 wiring path is designed to work with the Charles Industries 360 series
hannel banks. Wiring harts for 12 and 24 ports are shown below on the follow page for
referen e.
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PTT24 Manual
Controlled and Pass Thru Channels for the 12 and 24 Channel Selections
5

3. Select 12 or 24 Channel Operation
The toggle swit h “24< >12” sele ts either 12 or 24 hannels of E&M leads to be ontrolled by
the PTT24. The left position sele ts 24 hannels, the right position sele ts 12 hannels.
4. Connect the PTT24 rame/Chassis Ground
Frame ground is on the 48 VDC power onne tors, on the 50-pin tel o onne tor shells and
able tie down s rews.
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PTT24 Manual
5. Connect the PTT24 to 48 VDC Power
Ea h PTT24 has 2 diode prote ted power onne tors. The power onne tors are 3 position
Phoenix type onne tors. Ea h onne tor has Frame Ground, positive and negative power
onne tions.
6. Connect the Alarm IN and Alarm Out
The Alarm In an ome from another PTT24 or from the hannel bank. The Alarm Out an
be onne ted to another PTT24, to a SCADA system for remote reporting, to some lo al
external alarm signal devi e, et . The Alarm In and Alarm out are onta t losures. Alarm
Off is open, Alarm On is a losed relay onne tion. The PTT24 will operate with or without
the Alarm In or Alarm Out onne ted.
7. Select the Control Channel
Sele t the Control Channel to be monitored by the PTT24. For 12 hannel operation the
hannel must be from 1 to 12. For 24 hannel operation the hannel must be from 1 to 24.
The Power LED will flash if an invalid hannel is sele ted. .
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8. Relay Test Push Button Switch
The PTT24 Relay Test swit h an be pressed for a qui k test. The audible alarm should
sound, relays should li k, the Alarm LED should light, the Alarm Out relay should operate.
The alarm will sound only when the ALARM toggle swit h is in the ON position.
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PTT24 Manual
Chapter 3
Testing
Overview
The PTT24 has a front panel test swit h, Channel Sele tor Swit h for the Guard Channel,
Audible Alarm, and LEDs. The PTT24 has rear panel Alarm IN and Alarm OUT onne tors.
The PTT24 has an internal RS232 test port. A fa tory test assembly is used during
manufa turing for final testing of the PTT24. Most of the PTT24 fun tionality an be he ked
in the field. The following outlines the testing that an be done in the field. The fa tory test
pro edures are also noted. The fa tory test assembly an be pur hased for ustomer field use.
ield Testing
Front Panel Test Switch
Pressing the front panel test swit h will enable all the relays, sound the audible alarm, light
the Alarm LED, ause the Alarm Out leads to lose and all the relays will operate. The
sound of the relays operating an be heard as a low level li king sound. The alarm will
sound only when the ALARM toggle swit h is in the ON position.
Alarm In and Alarm Out
To test the Alarm In, the 2 leads on the Alarm In onne tor an be shorted together. When
shorted, the ALARM LED will light, the audible alarm will sound (if not disabled by the front
panel swit h) and all the relays will operate. The Alarm Out an be he ked with a VOM.
When the the Relay Test button is pushed the Alarm Out leads will be losed.
Channel Selector Switch and Power LED
The hannel sele tor swit h an be set to an invalid hannel number. This will ause the
Power LED to flash.
Audible Alarm
With the Alarm Cutoff Swit h set to ON, pressing the Test Swit h will ause the audible
alarm to sound. Also, shorting the Alarm In leads will ause the audible alarm to sound. If
the alarm is a tivated with the Alarm Cutoff Swit h set to OFF, no audible alarm will sound.
LEDs
The LEDs are Power/Invalid Channel, ACO and Alarm. The Power LED is on when power is
applied to the PTT24. The Power LED will flash if an invalid ontrol hannel is sele ted. An
invalid hannel is any ex ept 1 through 12 when 12 hannels are sele ted via the front panel
swit h. An invalid hannel is any ex ept 1 through 24 when the 24 hannels are sele ted via
the front panel swit h.
RS232 Port
The PTT24 has an internal RS232 port lo ated on the right hand side of the PC board when
viewed from the front. To a ess the RS232 port the over of the PTT24 must be removed.
The RS232 port is an RJ45 onne tor. A spe ial Network Management able and RJ45 to
DE-9 female onne tor is available for using this RS232 port. See the next se tion for details
on the operation of the RS232 port.
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Appendix A
Specifications
PTT24 Push-to-Talk Lockout Device Specifications
General
•Front Panel (these are approximate pla ements, subje t to relo ation):
- Toggle swit h to sele t 12 or 24 E&M ports
- Push button swit h to sele t port 1 to 24 for PTT Lo kout ontrol
•- Test swit h, momentary, to test lo kout fun tion
- Front panel swit h to kill an audio alarm that will sound when/if the ontrol port a tivates
- Green Power LED (flashes if an invalid ontrol port number is sele ted, i.e. 00, 25, et .)
- Red "ALARM" LED to indi ate the PTT Lo kout swit h is a tivated
•- Yellow "ACO" LED to indi ate the ALARM CUT OFF is on
•Rear Panel
•- 2 rear panel power inputs for -48 VDC power, diode prote ted between the 2 power inputs
to avoid power feed ba k
•- Alarm Input (dry onta t losure) to externally a tivate the PTT Lo kout fun tion and/or
test the unit
•- Alarm output dry onta t
•- Female 50 pin tel o onne tor from the hannel bank, s rew onne tion and able tie type
of able able fasteners
•- Male 50 pin tel o from the PTT lo kout to Transmitter side of the ir uit, s rew onne tion
and able tie type of able fasteners
Physical/Electrical
•Standalone or ra k mounting
•Power requirements: -48 VDC
•19” W x 10” D x 1 ¾” H
•3 pounds
Environmental
•Operational Temperature: -40 to +70 C
•Storage Temperature: -50 to +75 C
•Humidity: <95% Non- ondensing
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