WISCO International (IDA Corporation

Beginning September 1994, every new Net-Link shipped will have as a standard feature, Digital Audio Processing. This great new addition is known as WORDSAVER. Building on the VOX and Digital Voice Delay technology that IDA pioneered for the land mobile industry in the early 1980s, WordSaver makes the Net-Link virtually transparent to the mobile radio user. Using digital audio processing, the WordSaver eliminates the chance of any lost words or syllables.
NET-LINK is a software and hardware package that provides multi-user and multi-site linking between LTR trunking systems.
NET-LINK eliminates the need for telephone lines, microwave, or even other radio frequencies besides those which are already licensed to the SMR. Operation is also almost completely transparent to the end-user, since DTMF mics or other complicated signaling methods or procedures are not needed in order to establish a path through a NET-LINK system.
No modifications need be made to the end user's mobile units and these mobile radios need not be any particular brand or model.

An IBM PC or compatible computer, along with the NET-LINK interface, allows two Johnson 8605, 8615, or 8655 control station radios to be connected together in a “back-to-back” configuration, similar to a repeater. No extra hardware or software is needed in either radio.
One system and group position is used on each radio for each site that is networked. Since the computer sets the proper LTR ID CODE in each radio, and it is NOT necessary to use separate group positions, up to 250 LTR ID CODES can be encoded/decoded per site. This allows multiple users to use the link with multiple sites.
The long delays due to system scanning in the radios is greatly reduced or even eliminated, since system scan only needs to be used for multiple sites and NOT multiple users. When a user transmits, NET-LINK sets up both control station radios for a link. Each radio is locked to receive and transmit ONLY the proper ID CODES for that user. The conversation can then proceed as if both users are talking on the same trunking system. The WORDSAVER feature prevents the loss of syllables or words due to extended access time when working multiple sites.

This operation is transparent to the users. Most users find that, due to this feature of NET-LINK, the linked conversation flows just as smoothly as if both units were on the same trunking system. After a dealer-programmed amount of time elapses without either user transmitting, NET-LINK will unlock the receive on both control station radios to once again allow them to accept calls from any user who is programmed into the NET-LINK system.
Incorporated into NET-LINK is a method of providing the user knowledge of whether the distant linked trunking system is busy or not. If access to the distant linked trunking system has not taken place, due to all channels at that site being busy, a series of short beeps will be heard when a user unkeys his transmitter.
Most users find that, due to this feature of NET-LINK, the linked conversation flows just as smoothly as if both units were on the same trunking system. After a dealer-programmed amount of time elapses without either user transmitting, NET-LINK will unlock the receive on both control station radios to once again allow them to accept calls from any user who is programmed into the NET-LINK system.
Incorporated into NET-LINK is a method of providing the user knowledge of whether the distant linked trunking system is busy or not. If access to the distant linked trunking system has not taken place, due to all channels at that site being busy, a series of short beeps will be heard when a user unkeys his transmitter.

LTR� is a registered trademark of the E.F. Johnson Co.

Provides inexpensive, multi-user, dispatch linking between LTR trunking systems
Uses two JOHNSON 8605, 8615, or 8655 radios in back-to-back control station configuration
No modifications needed to radios - interface simply plugs into microphone connectors on radios
Software runs on any PC compatible computer with 2 serial ports and 1 parallel port, monochrome or color monitor, 640 K memory, DOS 4.01 and up

NET-LINK FEATURES:

Provides multi-user, multi-site linking between LTR systems.
WORDSAVER feature eliminates the chance of lost words or syllables.
Makes use of existing frequencies –– no microwave, telephone lines, or other radio frequencies are needed.
No need for DTMF mics on mobiles, or any special procedures to access a link.
Uses IBM PC or compatible computer, so software upgrades are simple. Parameters, such as how long a user has access to the link, are also dealer-programmable.
NET-LINK controls the radio's ID codes rather than depending upon the limited programming capabilities of the radios. Thus, up to 450 user/paths (Standard Configuration) may be set-up.
Local programming of NET-LINK is provided, as well as REMOTE programming by telephone line with the simple addition of a modem and remote operating software.
Provides audible indication to users if distant linked system is busy.
Fast, easy installation.

COMPUTER REQUIREMENTS:
IBM PC or compatible Internal battery-backed clock/calendar, 640K RAM, 2 serial ports, 1 parallel port, 1 floppy disk drive, Keyboard, Monochrome or color monitor, Modem (for remote programming), Remote operating software (for remote programming)

NET-LINK PACKAGE INCLUDES:
NET-LINK interface, 2 interface cables with modular plugs, NET-LINK software on 5.25 in. and 3.5 in. disk, Hard lock device, DOS 4.01 or later, and 2 standard serial cables.

NET-LINK SPECIFICATIONS:

Supply Voltage......................12vdc
Power Source........................Power is supplied from radios that are
                                          connected to NET-LINK interface
Dimensions...........................1.15 x 5.275 x 5.275 inches
Color..................................Black
Connections to radios............Modular jacks on NET-LINK interface
                                        connect through cables to mic jacks on                                           radios
Connections to computer.......9 pin D connectors on NET-LINK interface                                           connect through standard RS-232
                                        cables to serial ports (comm 1 and comm 2)
                                        on computer
Adjustments.........................Repeat audio level for each radio
                                         separately adjustable
Dealer-programmable features.......Time that NET-LINK remains locked
                                                     to a user may be set in one
                                                     second increments from
                                                     1 second up to 300 seconds
User ID codes and paths
Maximum number of users/paths.....450 1800 (Available on special
                                                      order)