WISCO International

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MODEL 745 System Teleconnect



Telephone interconnects offer the most economical and reliable method of allowing a group of 2-way mobile radio users to place and receive telephone calls through the public telephone network or a private branch exchange (PBX). In business applications, office based personnel can speak directly to radio users such as security guards, warehouse staff and delivery drivers. Similarly, radio users can call their office, the emergency services or their customers. Calling privileges, conversation timers and system access are all under the control of the system operator, so capabilities can be tailored to individual requirements.

The Model 745 Systems Teleconnect is Zetron's most advanced single channel telephone interconnect, allowing radios fitted with 5-tone encode and decode to place and receive telephone calls.

The Systems Teleconnect is equipped with a wide range of standard features including direct 5- tone to telephone number translation, group calling, and reset sequence to close mobiles at the end of a call. The Model 745 has been designed with performance and reliability in mind to enable all manufacturer's types of
5-tone radios to be efficiently connected to the telephone network. The Model 745 can control a repeater giving the system operator full control of all channel operations. Calls from Mobile Radio

Calls from Mobile Radio to Telephone
A mobile radio equipped with DTMF or selcall (5-one, select 5) may place calls to the telephone system The mobile user sends a string of up to 10 selcall digits which will have been programmed into the mobile, or may be entered by the mobile user. The Model 745 processes the string of digits, looking for an authorized user access code and the number to be called.
These will be included within the string of digits. If the mobile user is authorized, the call will be processed. The call processed as an autodial or direct format call - either dialing one of the programmed autodial numbers or
directly translating the selcall digits into the telephone format. Normal call restrictions can be placed for limited call length and dialing restrictions.

Calls from Mobile to Mobile
When the Model 745 is installed on a repeater, a mobile radio equipped with selcall may call other mobiles, using the Model 745 as a repeater manager.
Access is similar to "Mobile Radio to Telephone" calling The Model 745 looks for an authorized user access code, and recognizes the number to be called as another mobile radio on the system. The Model 745 then opens the repeater and selectively calls the other mobile radio. Mobile-to-Mobile calls support "who has called? sending the number of the calling mobile to appear on the display of the called mobile.

Dealer Programming
All of the Model 745 features can be accessed from a locally connected PC, or remotely via the internal modem. No special software is required for programming, with just a standard terminal emulation program required to access the internal programming.

Call Detail Logging
The Model 745 is capable of storing up to 4000 calls made through the system. These details can be accessed via the built-in modem and printed out for customer billing etc.

Calls from Telephone to Mobile Radio
A telephone user dials the Model 745 telephone number. The Model 745 answers the line and plays a recorded message or beep, asking the caller to enter the number of the mobile they wish to contact. The Model 745 then sends a selective call to alert the mobile user to the incoming call, and allows the mobile-to-telephone conversation to take place.

Priority Calls
Mobiles sending the pre-programmed priority call sequence can instruct other users to terminate any call in progress, gain immediate access to the system and dial out to a pre-programmed priority autodial function.

Enhanced version only.
Voice Prompts
User-recordable voice prompts can be played out to the telephone and radio scheme prompting users through the system with greetings and instructions.


  • Radio to telephone interconnect and system manager for PBX or public subscriber line connection
  • Direct access to telephone from mobile radios
  • Installs on simplex or duplex base stations and repeaters
  • Compatible with simplex or duplex mobile or handportable radios
  • Calls to and from mobile radio using selcall (5-tone, "select 5" - EEA, CCIR, ZVEI etc)
  • Database of 99 or 300 users
  • PC-programmable, direct/remotely with built-in modem
  • User-definable access code
  • Optional user-recordable voice prompts Optional dial click decoder for pulse telephone systems
  • Optional digital voice delay for enhanced simplex operation
  • Enhanced dial-out restrictions per user/system
  • Optional call details logging for up to 4000 records
  • 99 or 300 autodial telephone numbers
  • Priority call system access option
  • "Who has called?" information option
  • Conversation timers
  • EMC Approved, CE conformity




Power 10.5-16V DC,700mA or 9-12 VAC, 11 watts
Temperature 0 to 65 degrees Celsius
Size 470mm W x 181mm D x 44mm H,
470mm rackmount
Weight 6 pounds/2.7 kg


User capacity Standard = 99 Enhanced = 300
Function Table Standard = 99 Enhanced = 300
User ID length 2 to 6 digits per user
Selcall codes 5-10 digits per user, all 16 tones, seperate ANI and reset codes
Access code speed Five-tone = 10 to 30 digits/second (digit timing = 33 to 100 ms)
DTMF = 1 to 14 digits/second


Interconnect Airtime record per user 99.59.59
maximum accumulate or pre-pay in
HH-MM-SS format
Call detail option Logs detailed call information including number dialled, time/date stamp, duration and user
Capacity 4000 records stored internally
Filtering Toll only, all or none minimum time per user, errors on/off
Logging All calls logged on local RS232 port


Frequency range 10 to 3500Hz
Frequency accuracy 0.1%
Frequency stability 0.0005%
Distortion 2% nominal
Two-Tone Motorola/GE all tone groups, code plans, and capcodes
CTCSS 50 tones
DCS 104 codes


Line Input 3-wire connection to the PSTN
Connector RJ11-C modular jack.
Adaptor Cable RJ11 to BT 631A plug. 3 meter
Progress Tones Dial tone, ringing, double ring, busy.


Ringer equivalence 3.
Incoming call Ring detection on 3-wire circuit.
Programmable number of rings to answer
Call answer Off-hook, tip-ring current draw.
Call disconnect Busy tone, 2nd dial tone, call limit timer, mobile activity timer, loss of loop current.


PTT FET pull to ground.
COR Dual time constant noise detector or voltage change.
CTCSS/DCS Outpu -40 to +6dBM. Hi/Lo Selector. 600 ohm output.
Tx audio -40 to +6 d Bm. Hi/Lo Selector. 1K ohm output
Rx audio -40 to +10 d Bm. Hi/Lo Selector. 25K ohm input.
Channel busy input Closure input from secondary receiver COR.


Modem Auto-detection and support of 1200 baud.
Bell 212, CCITT V.22 and CCITT V.22bis.
Indicators Line 1. VOX. DTMF. Carrier. Encode.
Transmit. Aux. Power.
Switch Connect
Station ID Morse code, fixed 1200hz frequency and programmable call sign
(1 - 8 characters).
Equipment types Tone-Only pager, tone-and-voice pager. Talkback pager. Mobile.
Prompt tones Progress tones, error tones and warning tones sent to phone or mobile.
Programming Programmable via RS232 with local terminal, or remotely over phone lines using internal modem. Installation and user enable/disable via DTMF.
Data retention Battery backed, typically 5 years with no power.
Real time clock Battery backed, typically 5 years with no power.
Secondary protection On End-to-End telephone line
Auxiliary output Open drain FET pull-down to ground.
WISCO International, Inc. - MIAMI, FL U.S.A.
Fax: (954) 370-3997 | E-mail: wiscointl@wiscointl.com

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