https://urgentcomm.com/wp-content/themes/ucm_child/assets/images/logo/footer-new-logo.png
  • Home
  • News
  • Multimedia
    • Back
    • Multimedia
    • Video
    • Podcasts
    • Galleries
    • IWCE’s Video Showcase
    • IWCE 2022 Winter Showcase
    • IWCE 2023 Pre-event Guide
  • Commentary
    • Back
    • Commentary
    • Urgent Matters
    • View From The Top
    • All Things IWCE
    • Legal Matters
  • Resources
    • Back
    • Resources
    • Webinars
    • White Papers
    • Reprints & Reuse
  • IWCE
    • Back
    • IWCE
    • Conference
    • Special Events
    • Exhibitor Listings
    • Premier Partners
    • Floor Plan
    • Exhibiting Information
    • Register for IWCE
  • About Us
    • Back
    • About Us
    • Contact Us
    • Advertise
    • Terms of Service
    • Privacy Statement
    • Cookie Policy
  • Related Sites
    • Back
    • American City & County
    • IWCE
    • Light Reading
    • IOT World Today
    • Mission Critical Technologies
    • TU-Auto
  • In the field
    • Back
    • In the field
    • Broadband Push-to-X
    • Internet of Things
    • Project 25
    • Public-Safety Broadband/FirstNet
    • Virtual/Augmented Reality
    • Land Mobile Radio
    • Long Term Evolution (LTE)
    • Applications
    • Drones/Robots
    • IoT/Smart X
    • Software
    • Subscriber Devices
    • Video
  • Call Center/Command
    • Back
    • Call Center/Command
    • Artificial Intelligence
    • NG911
    • Alerting Systems
    • Analytics
    • Dispatch/Call-taking
    • Incident Command/Situational Awareness
    • Tracking, Monitoring & Control
  • Network Tech
    • Back
    • Network Tech
    • Interoperability
    • LMR 100
    • LMR 200
    • Backhaul
    • Deployables
    • Power
    • Tower & Site
    • Wireless Networks
    • Coverage/Interference
    • Security
    • System Design
    • System Installation
    • System Operation
    • Test & Measurement
  • Operations
    • Back
    • Operations
    • Critical Infrastructure
    • Enterprise
    • Federal Government/Military
    • Public Safety
    • State & Local Government
    • Training
  • Regulations
    • Back
    • Regulations
    • Narrowbanding
    • T-Band
    • Rebanding
    • TV White Spaces
    • None
    • Funding
    • Policy
    • Regional Coordination
    • Standards
  • Organizations
    • Back
    • Organizations
    • AASHTO
    • APCO
    • DHS
    • DMR Association
    • ETA
    • EWA
    • FCC
    • IWCE
    • NASEMSO
    • NATE
    • NXDN Forum
    • NENA
    • NIST/PSCR
    • NPSTC
    • NTIA/FirstNet
    • P25 TIG
    • TETRA + CCA
    • UTC
Urgent Communications
  • NEWSLETTER
  • Home
  • News
  • Multimedia
    • Back
    • Video
    • Podcasts
    • Omdia Crit Comms Circle Podcast
    • Galleries
    • IWCE’s Video Showcase
    • IWCE 2023 Pre-event Guide
    • IWCE 2022 Winter Showcase
  • Commentary
    • Back
    • All Things IWCE
    • Urgent Matters
    • View From The Top
    • Legal Matters
  • Resources
    • Back
    • Webinars
    • White Papers
    • Reprints & Reuse
    • UC eZines
    • Sponsored content
  • IWCE
    • Back
    • Conference
    • Why Attend
    • Exhibitor Listing
    • Floor Plan
    • Exhibiting Information
    • Join the Event Mailing List
  • About Us
    • Back
    • About Us
    • Contact Us
    • Advertise
    • Cookie Policy
    • Terms of Service
    • Privacy Statement
  • Related Sites
    • Back
    • American City & County
    • IWCE
    • Light Reading
    • IOT World Today
    • TU-Auto
  • newsletter
  • In the field
    • Back
    • Internet of Things
    • Broadband Push-to-X
    • Project 25
    • Public-Safety Broadband/FirstNet
    • Virtual/Augmented Reality
    • Land Mobile Radio
    • Long Term Evolution (LTE)
    • Applications
    • Drones/Robots
    • IoT/Smart X
    • Software
    • Subscriber Devices
    • Video
  • Call Center/Command
    • Back
    • Artificial Intelligence
    • NG911
    • Alerting Systems
    • Analytics
    • Dispatch/Call-taking
    • Incident Command/Situational Awareness
    • Tracking, Monitoring & Control
  • Network Tech
    • Back
    • Cybersecurity
    • Interoperability
    • LMR 100
    • LMR 200
    • Backhaul
    • Deployables
    • Power
    • Tower & Site
    • Wireless Networks
    • Coverage/Interference
    • Security
    • System Design
    • System Installation
    • System Operation
    • Test & Measurement
  • Operations
    • Back
    • Critical Infrastructure
    • Enterprise
    • Federal Government/Military
    • Public Safety
    • State & Local Government
    • Training
  • Regulations
    • Back
    • Narrowbanding
    • T-Band
    • Rebanding
    • TV White Spaces
    • None
    • Funding
    • Policy
    • Regional Coordination
    • Standards
  • Organizations
    • Back
    • AASHTO
    • APCO
    • DHS
    • DMR Association
    • ETA
    • EWA
    • FCC
    • IWCE
    • NASEMSO
    • NATE
    • NXDN Forum
    • NENA
    • NIST/PSCR
    • NPSTC
    • NTIA/FirstNet
    • P25 TIG
    • TETRA + CCA
    • UTC
acc.com

Why you should look into P25’s ISSI and CSSI

Why you should look into P25’s ISSI and CSSI

  • Written by Urgent Communications Administrator
  • 19th September 2018

Project 25, or P25, is an evolving suite of digital radio standards. Two of the latest standards use modern IP technology to enable more efficient and dynamic radio network management. The Inter RF Subsystem Interface (ISSI) standard uses IP to efficiently interconnect trunked P25 radio systems, while the Console Subsystem Interface (CSSI) employs IP to digitally connect dispatch console systems to P25 trunked systems.

On occasion, P25 network operators need to connect their radio systems to the P25 systems operated by other agencies and organizations. System designers have addressed this challenge with a range of different methods to construct a large trunked “network of networks” out of smaller P25 systems. Until now, this interconnection could only be delivered by proprietary technologies, such as Motorola’s SmartZone or Omnilink. Now internetworking is delivered by the P25 standard itself.

The ISSI standard provides a standardized, non-proprietary interface that allows two or more P25-compliant trunked systems to be connected—even if they are from different vendors or operating in different frequency bands (e.g., UHF vs. 700 MHz); using different versions of P25 (Phase 1 or Phase 2); or all of the above. The basic requirement is that each network must install an ISSI interface.

Given the capabilities of the ISSI, it is easy to imagine some scenarios for its deployment, as follows.

  • A network designer, faced with the task of designing a large trunked network while preserving performance, can break up the design into smaller sub-networks that inter-communicate using the ISSI.
  • Agencies that wish to set up mutual-aid communications can interconnect their independent P25 systems (and consoles) through the ISSI and CSSI.
  • A public-safety agency can deploy a radio system from its preferred vendor rather than joining a statewide system, but at the same time can still honor its interoperability obligations by connecting to the statewide system via the ISSI.

The organizational advantages of the ISSI also are quite obvious, as follows.

Because the ISSI is part of the P25 standard, it qualifies for grant support.

  • It vastly extends the interoperability of radio systems without the need to fund super-large networks or install large, complex gateways.
  • It offers flexibility for the future, enabling agencies to think beyond a single frequency band, a monolithic system, or a single vendor. Expansion can be contemplated in terms of adding whole networks—not just sites.
  • It allows for competitive tendering. Agencies can choose to change vendors or add vendors to their list of preferred suppliers. This encourages true interoperability, ensuring that agencies are not locked into contracts built around proprietary functionalities.

Historically, dispatch centers also have experienced a connection issue, one that apparently is unrelated to internetworking. Each radio vendor had its own proprietary solution for connecting console equipment to a radio network. Moreover, while P25 was moving toward digital IP connectivity, consoles typically still linked to radio systems using analog signalling schemes. This was alleviated for P25 conventional systems when the Digital Fixed Station Interface (DFSI) standard was issued—consoles now can leverage IP to connect in a standardized fashion. But trunked P25 systems needed to wait for the CSSI before they could do the same.

While the ISSI and CSSI core functionality fully has been defined, there are still standards yet to be issued. The outstanding documents concern testing (in particular, interoperability testing) and measurements. The ISSI functionality has been demonstrated by a variety of P25 equipment vendors (e.g., Tait, Cassidian, Motorola, Harris and E.F. Johnson) at trade shows since 2009. Meanwhile, the CSSI has been implemented by several major console vendors (e.g., Zetron and Avtec), and radio network vendors (e.g., Tait, Cassidian and Raytheon).

Tags:

Related Content

  • New Orleans-area 911 center inks multiyear APEX deal with Carbyne to replace call-handling system
  • Why you should look into P25’s ISSI and CSSI
    Newscan: Feds recover millions from pipeline ransom hackers, hint at U.S. Internet tactic
  • Cyber is the new Cold War, and AI is the arms race
  • Private wireless networks in the US start going public

Commentary


Updated: How ‘sidelink’ peer-to-peer communications can enhance public-safety operations

  • 1
27th February 2023

NG911 needed to secure our communities and nation

24th February 2023

How 5G is making cities safer, smarter, and more efficient

26th January 2023
view all

Events


UC Ezines


IWCE 2019 Wrap Up

13th May 2019
view all

Twitter


UrgentComm

Zipline delivery drone docks, charges by itself dlvr.it/SlBNWy

20th March 2023
UrgentComm

State and local leaders can alleviate the burden on public-safety personnel by tackling three workforce trends dlvr.it/SlBH89

20th March 2023
UrgentComm

6G is shaping up to disappoint, and the industry can blame itself dlvr.it/Sl918J

20th March 2023
UrgentComm

Change is coming to the network detection and response (NDR) market dlvr.it/Sl4cts

18th March 2023

Newsletter

Sign up for UrgentComm’s newsletters to receive regular news and information updates about Communications and Technology.

Expert Commentary

Learn from experts about the latest technology in automation, machine-learning, big data and cybersecurity.

Business Media

Find the latest videos and media from the market leaders.

Media Kit and Advertising

Want to reach our digital and print audiences? Learn more here.

DISCOVER MORE FROM INFORMA TECH

  • American City & County
  • IWCE
  • Light Reading
  • IOT World Today
  • Mission Critical Technologies
  • TU-Auto

WORKING WITH US

  • About Us
  • Contact Us
  • Events
  • Careers

FOLLOW Urgent Comms ON SOCIAL

  • Privacy
  • CCPA: “Do Not Sell My Data”
  • Cookie Policy
  • Terms
Copyright © 2023 Informa PLC. Informa PLC is registered in England and Wales with company number 8860726 whose registered and Head office is 5 Howick Place, London, SW1P 1WG.