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SmartTrunk Systems SmarTrunk II Скачать руководство пользователя страница 52

®

LTR is a registered trademark of Transcrypt International, Inc

.

Because of its system security, flexibility, and low cost, the SmarTrunk II Digital Trunking

System has become the world leader for trunked radio applications at VHF and UHF frequencies.
But in the Americas, customers often ask how SmarTrunk II compares with LTR

®

(Logic Trunked

Radio), which has been popular for use at 800 MHz for many years. This section presents a
comparison of the two systems, with an overview of the advantages and disadvantages of each
format.

A Difference in Channel Management

Perhaps the largest difference between LTR and SmarTrunk II is the
way that the radios are assigned a channel when a call is initiated. In
an LTR system, each mobile is managed by a home channel which
sends a continuous, sub audible signal during all conversations.
When a user initiates a call, the radio selects a channel based upon
the information it receives from its home channel controller.

Each time the PTT switch is pressed, the system must acquire a new
channel. And if all channels should become busy in the middle of a
conversation, the users are forced to wait until a channel becomes
available. This mode of operation is referred to as “transmission
trunking”.

In contrast, SmarTrunk II uses a mobile scan based protocol where the
mobiles, not the controller, select which channel to use. When a
SmarTrunk II user initiates a call, the radio scans for an available
channel and sends a digital datapack to the controller. The controller
then sends a datapack to all of the mobiles in the system and the
appropriate mobiles respond by answering the call. At that point, the
conversation takes place on the same channel until a programmable
hang timer expires or one of the users sends a disconnect signal.

Although the initial channel access time is slightly longer, once a
channel is acquired, it is held for the duration of the conversation. This
means that subsequent PTT’s are instantaneous for the balance of the
exchange. This is known as “message” or “conversation” trunking.

Appendix C - SmarTrunk vs. LTR

52

SmarTrunk Systems, Inc.

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Содержание SmarTrunk II

Страница 1: ...SmarTrunk II System Overview Revision 9 March 2004 Benelec Pty Ltd Unit 2 581 587 Gardeners Rd Mascot NSW 2020 T 61 2 93647000 F 61 2 93647099 E david benelec com au...

Страница 2: ...d radio trunking protocol in more than 98 countries Recognizing the growing importance of the SmarTrunk II product line the company s corporate name was changed to SmarTrunk Systems Inc in early 1996...

Страница 3: ...9 System Requirements 10 Section 3 Types of Calls and Methods of Operation 11 Using SmarTrunk II For Radio Dispatch Applications 11 Mobile to Group Call 11 Mobile to Mobile Private Call 12 Mobile Oper...

Страница 4: ...ontroller only System 23 Introduction 23 Key system features 23 ST 510 Components 24 System Operation 25 System requirements 26 Features and services provided 26 SmarTrunk II upgrades 33 Network Inter...

Страница 5: ...cy calling What is Trunking The term trunking originated decades ago in the telephone industry to describe the process of selecting one clear communications path from many possibilities It is based on...

Страница 6: ...runking controller Channel Exclusivity In a conventional system discourteous co channel users can jump on a channel in the middle of another conversation thereby interrupting the call in progress In a...

Страница 7: ...a s Smartnet E F Johnson s LTR Trident s Passport etc are centralized systems As they are designed to use clear frequencies these trunking formats are not as well suited as SmarTrunk or as easy to lic...

Страница 8: ...ch does not require a Protected Service Area PSA FB6 is for private carrier systems such as radio dealers that would place additional users on the system FB2 is for private in house systems such as a...

Страница 9: ...provide local area communi cations can benefit from SmarTrunk II X Community repeater operators can upgrade to group dispatch and selective mobile to mobile calling to existing customers or expanding...

Страница 10: ...connected directly to a standard telephone line via a RJ 11 jack Each channel can support one individual conversation Therefore a three channel system can support three simultaneous private conversat...

Страница 11: ...e group presses the key to terminate the call or repeater disconnects at the expiration of the Group Activity Timer SPECIAL FEATURES Automatic PTT Push To Talk Mode subscribers may initiate group call...

Страница 12: ...ing a re dial function Clear Channel Alert notifies the subscriber when a channel be comes available after the subscriber has attempted to access the system when all channels are busy Radio Kill elimi...

Страница 13: ...l SPECIAL FEATURES Selective Toll Restriction programmable on a per user basis to allow or prevent long distance or toll calls Call Limit Timer programmable call limit timer on a per user basis Line 1...

Страница 14: ...ers may also initiate calls to a group of mobile subscrib ers Emergency Telephone Number Call SEQUENCE OF EVENTS 1 Mobile subscriber enters 0 and on the radio keypad 2 Mobile radio searches for an idl...

Страница 15: ...53 FEATURE SUMMARY Subscribers per system 4 096 Call records per controller 4 500 Paging code combinations available 320 000 Communication between controllers Serial databus Single access point for up...

Страница 16: ...o allows an ST 853 system to be programmed with subscribers from other systems for roaming applications Databus Communication between Controllers All of the ST 853 controllers at a site are connected...

Страница 17: ...ed Telephone Interconnect Features The ST 853 offers enhanced telephone interconnect features which can be used to support a variety of new applications Auto Route feature routes incoming calls to a d...

Страница 18: ...y or where there is possible interference from a distant repeater on the same channel ST 911 Cable Assembly Option A 4 long 122cm shielded cable assembly terminated with a DB 25 connector which mates...

Страница 19: ...a Standard and Yaesu Vertex see Appendix A for details A summary of the Omni features is listed below Channel Banks The Channel Banks feature allows subscribers to access different sites which may use...

Страница 20: ...Push To Talk button Previously a subscriber could call only one group by pressing PTT The system operator may program up to 16 Group Codes in the radio logic board which may be selected by the subscri...

Страница 21: ...are busy while scanning for incoming calls When a subscriber places a call the radio immediately vectors to an available channel As a result channel access time is reduced considerably especially in l...

Страница 22: ...en an individual call is made to a radio the display on the radio if so equipped will show the unit ID of the user who is calling At the present time this feature will only be available for mobile to...

Страница 23: ...d to existing SmarTrunk II controllers is the replacement of the controller s firmware EPROM KEY SYSTEM FEATURES The ST 510 allows SmarTrunk II system operators to add the following high performance f...

Страница 24: ...base maintenance subscriber validation and call record accounting Switch Rack Power Supply The ST 510 system components are mounted in a standard 19 rack panel with eleven slots to accommodate the sw...

Страница 25: ...party is busy or free and if this type of call is valid for the called party If valid the ST 510 will send a new data packet via Roaming Bus to each site in the network where the called party is autho...

Страница 26: ...100 multiplexers are used to connect to remote ST 853 s For PSTN or PBX interconnection the ST 510 has a conventional line termination for an analog TELCO line 2 wire loop start The system power suppl...

Страница 27: ...tem has three voice mail greetings for each of the following situations Mobile is powered off or is out of range Mobile is in range but the subscriber does not answer the call All incoming calls autom...

Страница 28: ...ers such as the telephone number or SmarTrunk extension to be called and how long the current parameters are to remain active optional There are three ways to forward a call To any PSTN number or PABX...

Страница 29: ...tch Console the system operator may define a dynamic virtual group number for critical emer gency situations For example in an airport communications system it may be necessary to make an emergency ca...

Страница 30: ...ges could be recorded and updated by a commercial spon sor who would compensate the system operator for providing this service Access to these message boxes may be made through the PSTN PABX or radio...

Страница 31: ...rminal to the PC s sound card via ethernet Any type of call may be made from the dispatch console The dispatch software offers several security levels and accessibility layers for differ ent dispatche...

Страница 32: ...may be backed up using any data storage media A special file restore utility is included in the software package to restore archived files into the system in order to listen to a specific call or call...

Страница 33: ...d prepaid billing options Available in both English and Spanish versions the billing software may be run on line for real time accounting of prepaid calling cards or offline in a conventional batch mo...

Страница 34: ...to a target city through the network Larger Call Records Database With the ST 510 call records are stored on the hard disk of the main CPU where they can be maintained indefinitely depending on disk...

Страница 35: ...tion is essential to allow system admin istrators to optimize system efficiency Late to Join If a user is busy on another call and a call of his group or sub group originates on another channel the sy...

Страница 36: ...t the ST 510 there is only one data connec tion for the Roaming Bus and in this example four simultaneous audio ports that may be multiplexed by a digital MUX and inserted into the E1 T1 scheme In the...

Страница 37: ...he gateways to the link s and therefore the remote ST 100N s The ST 100 also has remote site linking capability Some features of the ST 100 Multiplexer are Simplifies linking requirements ST 853 audio...

Страница 38: ...user can do fast fleet dispatch look at fleet status on line enable an emer gency call assign aliases and many more functions One ST 510 can support as many consoles as necessary Emergency routines E...

Страница 39: ...equired SmarTrunk II is generally much less expensive and easier to license than centralized trunking systems Q What is a Scan Based system Unlike centralized systems scan based systems do not require...

Страница 40: ...ent PTT s are instantaneous Q What base station equipment is required for a SmarTrunk system Atypical SmarTrunk channel would consist of the following items One SmarTrunk Model ST 853 Station Controll...

Страница 41: ...h controller has two standard RJ 11 telephone jacks which accept normal two wire loop start lines from a PBX or the PSTN Q Do all SmarTrunk II subscriber radios require a DTMF keypad No Group dispatch...

Страница 42: ...mobile telephone 2 The level of service desired and 3 The number of channels in the system For example based on our Traffic Analysis Study and input from our system operators the following loading fi...

Страница 43: ...ndix A SmarTrunk II Logic Board Compatibility Chart Appendix B SmarTrunk SystemApplication Notes SANS Appendix C SmarTrunk vs LTR Appendix D Simplified Customer Numbering Plan Appendix E ST 510 WideAr...

Страница 44: ...ions The number of different RF banks which may be selected is also shown Omni Banks Includes the Basic Banks feature set listed above in addition to the Omni feature set offering multiple PTT groups...

Страница 45: ...00 430 Half 40 Enhanced Omni Flexible 1 ST 865IC Yes1 440 470 2 or 5 Banks2 Icom p n UT 105 Yes1 470 500 Yes1 490 512 Icom IC F30 LT No 136 150 Half 96 Enhanced Omni Flexible 1 ST 865IC Yes 146 174 6...

Страница 46: ...ola GP 300 Yes 136 174 Half 16 Basic 8 Banks Flexible 5 ST 865M 403 520 Motorola GP 350 Yes 146 174 Half 16 Basic 8 Banks Flexible 5 ST 865M 438 470 Motorola Pro3150 Yes 136 174 Half 64 Enhanced Flexi...

Страница 47: ...Half 32 Enhanced Omni Flexible 1 ST 865IC Yes 440 470 2 Banks Icom p n UT 105 Yes 450 470 Yes 470 490 Yes 490 512 Icom IC F420S Yes 440 470 Half 8 Enhanced Omni Flexible 1 ST 865IC Yes 470490 2 Banks...

Страница 48: ...4 Half 64 Enhanced Omni Flexible 1 ST 865M4 450 474 16 Banks Motorola Pro3100 Yes 136 174 Half 64 Enhanced Flexible 1 ST 865M52 5100 7100 CDM750 400 520 Omni 16 Banks 1250 1550 GM338 Ranger SM 1630 US...

Страница 49: ...Radio No Of Install SmarTrunk Radio Model No Band Duplex Chan Ease Model No MHz Alinco DR 108 No 136 174 Half 16 3 ST 869 02 Alinco DR 130 No 136 174 Half 16 3 ST 869 02 Alinco DR 430 No 400 470 Half...

Страница 50: ...lease note that this application requires ST 852 version 3 51 firmware or the ST 853 Adding a CTCSS Decoder to a SmarTrunk II Controller Also available is information about the ST 910 CTCSS Option Kit...

Страница 51: ...tem operators analyze the trade offs between the number of users the number of channels and the percent of time a user will receive a busy signal Examples are provided to aid in understanding how to u...

Страница 52: ...ontroller Each time the PTT switch is pressed the system must acquire a new channel And if all channels should become busy in the middle of a conversation the users are forced to wait until a channel...

Страница 53: ...R System Security Considerations One of the primary concerns of system operators is maintaining system security against hackers pirates and other unauthorized users LTR relies on a sub audible data st...

Страница 54: ...cuitry is built in to every SmarTrunk II controller at no extra cost On the other hand many LTR controllers are designed only for basic dispatch operation so that telephone interconnect is an expensiv...

Страница 55: ...es The choice of system depends largely on the features and type of service to be offered and the availability of clear exclusive channels In general LTR may be preferable for a new shared system offe...

Страница 56: ...call set up time Approx 1 3 seconds Approx 300 milliseconds Subsequent PTT access time during the same call Instantaneous Approx 300 milliseconds Home group dispatch Push to talk PTT access Push to ta...

Страница 57: ...57 SmarTrunk Systems Inc...

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