PassPort is an enhanced low speed trunking protocol that improves on the many shortcomings of the widely  accepted and popular LTR trunking protocol. While LTR met the needs of many early trunking applications, its limitations became very apparent to those wanting to grow their systems beyond the most basic of SMR offerings. Wireless users demand more features, coverage and services from today’s wireless provider. Networking of multiple sites is an important element in the feature mix necessary to meet the needs of today’s wireless customer.

LTR has a severely limited ID code structure and no inherent provision for unique IDs on a per-radio basis. Additionally, there is no protocol specific support for roaming or networking. These basic shortcomings have led to numerous stop-gap efforts to improve and enhance the functionality of LTR systems, but none have adequately addressed the fundamental requirement of many operators to provide Wide-Area Dispatch Networking and seamless roaming between sites. PassPort is the trunking protocol that builds on the most desirable elements of LTR and addresses the needs of radio users with wide area dispatch networking, seamless roaming, selective call capability, positive system management and access control, short message service, voice mail capability and many other enhanced features.

 Automatic Vehicle Location, Telemetry, and Custom Reporting

• Polling Up To 120 Units Per Minute

• Data Is Sent On Frequency, In Band, Transparent To The User

• Low Cost TD-10 Mobile Interface

• Up To Eight Telemetry Inputs

• Uses Same Radio For Voice and Data With No Collisions

• No Separate Talk Group Or Handshake Required To Send Data

The Trident Data Environment

Trident Micro Systems’ state-of-the-art technology breaks the mold in transportation of data in a
Conventional, LTR®, or PassPort® environment.  There is no longer any need to open a talk group to send data. There is no longer any need to establish a handshake to transmit data. Data is sent on frequency, in band, in a method totally transparent to the user. No more compromising channel efficiency.  No more sacrificing RF resources. No more inefficient “reporting by exception.”

The old data systems demanded redirection to another channel or talk group to send the data. Once the transmission was successful, the system would return to the voice talk group and resume normal operation.  This complete round trip method takes several seconds and is known as “Channel Steering.”

Trident’s method of polling units in the field, prevents the mobile radio from reporting on its own, thus eliminating missed voice calls and removing the potential for collision. In a Trident Data environment, data is sent only in response to a poll from any of the Trident Data Controllers without user interaction. In the Trident Data environment the controller is able to acquire data much faster than previous methods, up to 120 data messages per minute!

Trident’s new TD Series of mobile interface modules are low cost multi-functioning devices that allow for GPS, radio and telemetry interface. Each TD Module is manufactured for a specific application ranging from mobile data to fixed telemetry.

(Brochure)

iOPT Comm-Tac

Mobile Digital Interoperability

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