ISSI.1 Network Gateway Subsystem

DATA SHEET
ISSI.1 Network Gateway Subsystem
Enabling Project 25 ISSI wireline interoperability
When a disaster strikes or large events require complex coordination and
interoperability among first responders, network operators require versatile
and immediate interoperability solutions to enable them to respond to the
sometimes highly unpredictable nature of emergency situations. This has
created an immense and well-understood need for network interoperability
and the creation of System of Systems interoperable networks.
Today’s ASTRO® 25 trunked networks use IPbased call processing and the Project 25 (P25)
Common Air Interface. This means Project 25
(P25) trunked networks can now be connected
using IP-based gateway technologies. The Project
25 Inter-RF Subsystem Interface (P25 ISSI) is one
of the first end-to-end digital IP network interface
standardized by TIA. Motorola has implemented
this interface in a software application called
the ISSI.1 Network Gateway (ISSI.1 NGW)
Subsystem, which will enable P25 ISSI equipped
trunked networks to implement end-to-end digital
interconnectivity to meet the needs of Project
25 system users who need to interoperate.
The ISSI.1 NGW supports basic call services
including ISSI Group Call, ISSI Emergency Call
and end-to-end P25 encryption. It is simply
added to an ASTRO 25 trunked core, and does
not require any software upgrades to the
core, site equipment, consoles or radios.
For more background and
an animated overview on
Network Interoperability
and the P25 ISSI, visit
motorola.com/interoperability
ISSI.1 Network Gateway Advantages
The ISSI.1 Network Gateway is an easy and cost
effective way to connecting Project 25 systems
together for interoperability. The ISSI.1 NGW can:
• Connects disparate systems – enabling
talkgroups from differing System IDs, WACN
IDs, different P25 system vintages, RF bands,
manufacturers and coverage areas to be connected.
• Enable task force interoperability – First
and second level responders can be securely
and digitally connected together across
multiple systems and vast coverage areas. This
versatility will undoubtedly become a vital tool
in responding most effectively to unpredictable
or unusual projects, events and disasters.
• Permit multiple P25 ISSI enabled networks to
interconnect – networks from other Project 25
trunked manufacturers can be connected together
in a regional network interoperability solution.
• Provide connected roaming without modifying
subscribers – enabling wireline connectivity
without requiring software upgrade to the
subscriber devices to enable roaming.
• Reduce funding and upgrade dependences –
enabling different ASTRO 25 vintage systems to
be connected, lessening inter-agency funding
cycle dependences.
• Retain individual system and fleetmap
autonomy – preserves the User Configuration
Server databases on each system enabling
operational autonomy among the connected
systems and fleetmaps.
• ‘Bolt-On’ to existing ASTRO 25 networks –
quickly and cost effectively add ISSI.1 NGWs
to an existing and deployed ASTRO 25 network
without requiring the network to be upgraded
to a new version and without upgrading
subscriber or Control Channel (CCH) software.
• Enable end-to-end encryption without
transcoding – using network connectivity delivers
performance with lower delays, better audio
quality and more robust call services than can
be accomplished when analog or transcoding
methods are used.
Operational Overview
Roaming Between Unconnected P25
Trunked Networks (Before P25 ISSI)
The Project 25 Common Air Interface allows P25
radio users, using radios on the appropriate RF
band, to roam between Project 25 networks.
The illustration at right shows P25 radio user
“Dan” roaming on to a second P25 System B,
performing a manual mode change and affiliating
onto the neighboring network. When the user
does this type of roaming, their radio essentially
“becomes” a System B radio, enabling them to
communicate with other talkgroup (TG) members
in System B. However, an unconnected roaming
user cannot communicate back to their dispatchers
or other talkgroup members in System A. The lack
of connectivity to the System A dispatcher and
talkgroup members is the problem the P25 ISSI
interface sets out to solve.
Console B
Console A
System A
Matt
System B
Cynthia
Dan
Dan
A: Talkgroup 100
A: User ID 1
B: Talkgroup 150
B: User ID 12
A: Talkgroup 100
A: User ID 2
TG 100
B: Talkgroup 150
B: User ID 14
Andy
B: Talkgroup 150
B: User ID 13
TG 150
Unconnected Inter-System Roaming
Connecting Users on Multiple Systems
The ISSI.1 NGW subsystem enables the connectivity
between systems as shown at right. The P25 Radio
users operate on separate talkgroups, which are
logically connected and “mapped” between the
respective ISSI subsystems, creating the operation
of a single, logical Interoperability Talkgroup (iTG)
between the two systems. This means that when
any of the users in either system, “Matt”, “Dan”,
“Andy”, or “Cynthia”, key up in either network, all of
the radio and console users affiliated to those iTGs
in both networks hear the ISSI group call.
System B
Network
System A
Network
System A
Network
System B
Network
ISSI Link
ISSI
Subsystem
ISSI
Subsystem
Console B
Console A
System A
Matt
System B
Cynthia
Dan
A: Talkgroup 100
A: User ID 1
A: Talkgroup 100
A: User ID 2
B: Talkgroup 150
B: User ID 14
Andy
TG 100
TG 150
B: Talkgroup 150
B: User ID 13
iTG: Interop 1
ISSI Connectivity over Multiple P25 Systems
Roaming Across Networks
In the roaming scenario at right, “Dan” is traveling
out of the range of system A. When “Dan” notices
that the signal from his current system, System A,
begins to decline, he would initiate the manual mode
change to affiliate into System B thereby joining iTG
Interop 1. The important enhancement for “Dan” is
that after he roams into System B, he will continue
to communicate with the System A console operator
as well as any users who are in iTG: Interop 1 in
System A.
System A
Network
System B
Network
ISSI Link
ISSI
Subsystem
ISSI
Subsystem
Console B
Console A
System A
Matt
System B
Cynthia
Dan
Dan
A: Talkgroup 100
A: User ID 1
B: Talkgroup 150
B: User ID 12
A: Talkgroup 100
A: User ID 2
TG 100
TG 150
iTG: Interop 1
Manual Inter-System Roaming
Andy
B: Talkgroup 150
B: User ID 13
B: Talkgroup 150
B: User ID 14
Connecting Systems Over Wide Area Networks
The ISSI.1 subsystem is comprised of the server, ISSI.1 NGW application, router, Ethernet switch and
firewall. It uses an ISSI Link to connect to other ISSI subsystems over a Wide Area Network (WAN). The ISSI
Link is an Ethernet link which requires a fixed IP address and up to 384 kbps of bandwidth. Public safety
agencies who require interconnectivity can select from a variety of last mile and WAN solutions.
WAN
ASTRO 25 Network
System A
ISSI
Subsystem
ISSI Link
ASTRO 25 Network
System B
ISSI
Subsystem
Managing ISSI.1 Network Gateway Subsystems
Although the ISSI.1 NGW is a “bolt on” device, a variety of existing ASTRO 25 tools can be used to monitor
the ASTRO 25 system. For instance, ZoneWatch and the Affiliation Display can be used to monitor ISSI
traffic. A separate ISSI.1 administration application provides additional management capabilities, such as
allowing an operator to view fault status of the application, view status of the ISSI Link and configure the
gateway. The configuration tool allows both import and export of detailed iTG information from an Excel
.CSV file format.
System in the Middle Considerations
As regional networks are being conceptualized for multi-system connectivity to create coherent and
effective regional network interoperability, the method in which multiple Project 25 systems are
interconnected should be considered. The advantages of a “hub and spoke” or “system in the middle”
type of configuration include:
• Lower backhaul costs – Compared to full mesh
or nearly full mesh connectivity, the system in
the middle dramatically reduces the cost and
complexity for the connected “spoke” networks.
• Easier to add systems – When a new system is
added only the Hub system and gateways need to
be re-provisioned, keeping the design flexible and
further reducing cost and management complexity.
• Burden of contributing donor TGs confined
to hub system – With a zone in the middle, only
the “hub” system needs to provide the mapped
Talkgroup IDs. This is easier and less complex
to manage.
• More consistent performance – The hub and
spoke architecture enables the calls which operate
across the network to have more consistent call
performance for multi-system calls and operations.
spoke
spoke
NEW
System F
System B
hub
System A
spoke
spoke
System C
System E
spoke
System D
Technical Specifications
CALL SERVICES SUPPORT Supported
Specified in TIA-102.BACA
ISSI Group Registration
Yes
Yes
ISSI Group Tracking
Yes
Yes
ISSI Group Call
Yes
Yes
ISSI Emergency Group Call
Yes
Yes
E2E Encrypted ISSI Group Call
Yes
Yes
Manual Inter-System Roaming
Yes
No
HARDWARE SPECIFICATIONS
Gateway Server
Sun Netra T5220
Processor
4-Core 1.2 GHz UltraSPARC T2
Memory
32 GB
Mass Storage
300GB,10000 rpm SAS Disk
Optical Drive
1 DVD-RW
Networks & I/O Options
4 x 10/100/1000 Mbps Ethernet, 2 PCI-X, 4 PCIe
Power / Cooling
100-240 V AC or –40 to –75 V DC
Physical Specifications
2 Rack Units
Operating System / Software
Solaris 10 Pre-installed
SOFTWARE SPECIFICATIONS
ASTRO 25 Release Compatibility
6.9/7.2 or higher
Maximum ISSI.1 NGW Applications
3 per Server
Maximum Interoperability Talkgroup Mappings
60 per ISSI.1 Application
Maximum Simultaneous Interop TG Calls
27 per ISSI.1 Application
ISSI LINK SPECIFICATIONS
Physical
Ethernet RJ45
Recommended Maximum Jitter Delay <20ms
Maximum Bandwidth Required Per GW App*
6 DS0s
Recommended Maximum End-to-End Delay
100ms
*Calculations for bandwidth identical to those for RF site links; 6 DS0 assumes 27 simultaneous calls
ISSI.1 NGW SUBSYSTEM EQUIPMENT
Subcomponents Required
Requirements with 1
ISSI.1 NGW Application
Requirements with 2
ISSI.1 NGW Applications
Requirements with 3
ISSI.1 NGW Applications
Netra T5220 Server
1
1
1
ISSI.1 NGW Application
1
2
3
S2500 WAN Router
1
2
3
S2500 T1/E1Daughter Board*
1
2
3
S2500 Ethernet Daughter Board*
1
2
3
S2500 Encryption Module**
1
2
3
2610-24 Ethernet Switch
1
1
1
SSG-140 Firewall
1
1
1
*Each S2500 WAN Router can be connected to the ASTRO 25 Zone Controller via a T1 or an Ethernet Site Link
**If Encrypted Site Links are chosen as an option, then one S2500 Encryption Module is required for each S2500 WAN Router
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