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Model 600/620 High Speed Simulcast Paging System


The Zetron High Speed Simulcast Paging System uses timing information from the Global Positioning System (GPS) to synchronize the transmission of digital paging signals to very tight tolerances. This provides the microsecond timing accuracy necessary for high-speed simulcast paging with protocols such as POCSAG and FLEX�.

Model 600/620The system consists of the Model 600 Wireless Data Manager (Source Unit) and multiple (up to 1000) Model 620 Wireless Data Encoders (Destination Units).

Model 600 Wireless Data Manager
The Model 600 accepts TNPP input from up to three TNPP links, efficiently batches the pages with timing information from an attached GPS, and delivers the pages across a link to multiple Model 620 Wireless Data Encoders.

Model 620 Wireless Data Encoder
The Model 620 receives batches of paging data from the Model 600, and encodes the data for POCSAG or FLEX. At the precise time indicated by an attached GPS, the encoded message batch is sent to the transmitter, resulting in synchronous broadcast with other Model 620 controlled transmitters.

The link between the Source and Destination units may be any type (or combination) of link that can reliably transport data. Designed for nonproprietary transmitters, the system is ideal for cost effective build-out of new transmitter sites for public or private paging system operators.

Standard features include encoding for POCSAG (512, 1200 and 2400 baud) and basic FLEX (1600), support for up to 1000 destinations with TNPP routing and zoning capabilities, multi-frequency transmitter control, Trimble Acutime 2000 compatible GPS interface, traditional two-level digital transmitter interface, and multiple user-definable input/output ports. Optional features include enhanced four-level FLEX (3200 and 6400 baud) for the I20 transmitter interface, and support for other GPS devices.


Critical to simulcast paging is the requirement to synchronize the transmission of paging to very tight tolerances. Every transmitter that can be received by a particular pager must have its transmission exactly in phase with each other. Timing accuracy of within a few microseconds is necessary to assure reliable transmission of the FLEX protocol. Even transmission of information at the speed of light has a delay that must be equalized in simulcast systems. The controller at the transmitter must compensate for delays introduced by different equipment, path distances, modems and other sources of delay. The High Speed Simulcast System does this by using the Global Positioning Service (GPS). GPS is well-known system used to provide accurate location information to users worldwide. Less well-known is its capability to provide extremely accurate timing information as well. By using GPS timing signals, the Destination Unit is able to synchronize the paging data with microsecond accuracy.



  • Accepts page input from any TNPP source
  • Supports up to 1000 destinations with TNPP routing and zoning capabilities
  • Encodes POCSAG (512, 1200 and 2400 baud) and basic FLEX (1600)
  • GPS synchronized simulcast with microsecond accuracy
  • Trimble Acutime 2000 compatible GPS interface
  • Traditional two-level digital transmitter interface
  • Multiple user-definable input/output ports


  • Enhanced four-level FLEX (3200 and 6400 baud) for I20 transmitter interface
  • Interface for other GPS devices




System Size 1 M600 plus 1 to 1,000 M620s
Standard Formats POCSAG (512, 1200, 2400)
FLEX (2 level 1600)0
Optional Formats FLEX (4 level 1600 & 3200)
Page Input TNPP Capcode Pages
Data to M620s TNPP Command Packets
TNPP routing Configurable routing table
Simulcast Adjustment +10 seconds to � 10 seconds,
in 1 microsecond increments
Frequencies 16 selected with 4 output bits
Coverage Zones 1 to 1,000
Morse Code ID Per M620 per frequency
Page Buffer on M600
Data Buffer on M620
Flash Storage
12 Megabytes RAM
10 minutes maximum configuration data and unit software
User Interface TTY & YMODEM UI (e.g.Hyperv Terminal).
Test Pages Continuous periodic/short term via UIc
Physical DB-44S (female)
Standard PTT Open drain FET output, external pull up to +24VDC ok, or TTL
Standard Digital Data Open drain FET output, or TTL, or RS-232
I20 Data RS-422: Dibit (2 bits); Baud Clock; and Tx On
PURC compatibility If connect M33 to M620 output
Usage User Interface and Logging Interface
Electrical RS-232
Physical DE-9S (female)
Baud Rates 9600
Usage Page input to M600 and data transfer to M620s, simplex or duplex operation, also TNPP routing
Alternate Uses User Interface, Logging Interface
Electrical RS-232 and RS-422
Physical RS-232 DE-9P (male)
Physical RS-422 DA-15P (male)2
Ports on M600 2 RS-232 and 2 RS-422
Ports on M620 2 RS-232 and 1 RS-422
300, 1200, 2400, 4800, 9600, 19200,
Baud Rates 38400, 57600, 115200
GPS INTERFACE (GPS Receiver/Antenna not included)
Usage GPS precision timing data input
Electrical RS-422 or RS-232 for time stamp data, RS-422 or TTL (with external adapter) for 1 PPS
Physical DA-15S (female)
Daisy Chain RS-422 of GPS between units
Compatibility Trimble Accutime standard, others ask factory
ALARM I/O PORT (inputs not currently used)
Physical DB-25S (female)
Inputs TTL or contact closure (internal pull up to +5VDC through 47Kohm, or external pull up to 12VDC ok)
Outputs Active low (0V = alarm on), open drain sink up to 150mA (internal pull up to 12VDC through 47Kohm, or external pull up
to +24VDC ok)
US FCC Part 15 Class A.
European EMC Directive 89/336/EEC
Emissions: EN 55022:1998
Immunity: EN 55024:1998
WISCO International, Inc. - MIAMI, FL U.S.A.
Fax: (954) 370-3997 | E-mail: wiscointl@wiscointl.com

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