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Call Control and Messaging
Redundancy for Higher Availability
NMS Communications' SS7 Version 3.x
software provides Message Transfer Part (MTP), Integrated
Services Digital Network User Part (ISUP), Telephone
User Part (TUP), Signaling Control Connection Part
(SCCP), and Transaction Capabilities Application Part
(TCAP) redundancy. Redundancy allows applications
to preserve stable calls or message transactions during
maintenance upgrades or in the event of board or node
failures.
Features
- Supports the sharing of a single
Point Code by redundant MTP, ISUP, SCCP, and TCAP
protocol layers
- Health management interface allows
user applications to detect and recover from hardware
or software failures
- Automatic detection and prevention
of application message overloads (congestion handling)
- Off-loads SS7 protocol processing
from the host computer to board-based protocol stack
- Allows cost-effective access to the
SS7 network for integration into products from OEMs
and infrastructure providers
- Provides support for both Solaris™
and Windows® system-level operating systems
- Reduces application development time
through NMS' Natural
Access™ API interface
- Provides support for intelligent
peripherals, service nodes, and adjunct processor
applications
- Provides underlying protocols required
to support higher-layer Mobile Switching Center
(MSC) and Base Station Controller (BSC) protocols
- Compliant with ANSI, ITU-T, and ETSI
SS7 standards
- Provides modular implementation of
SS7 protocol stack with host computer Application
Programming Interfaces (APIs) to MTP layers 2 and
3, ISUP, SCCP, and TCAP
- Supports a selection of TX Series
network interface configurations including T1, E1,
and V.35
- H.100-, H.110- and MVIP-compliant
Technical Description:
Two Platforms, One Point Code
Carrier-grade systems require extremely
high levels of network uptime, typically 99.999%.
A critical requirement in many systems is to eliminate
single points of failure in SS7 links, SS7 boards,
and system chassis. Furthermore, systems require the
ability to perform hardware and software upgrades
without system downtime. One solution is to use multiple
chassis, each with an SS7 board and supporting one
or more SS7 links. NMS SS7 Version 3.x allows two
TX boards to share the same Point Code such that the
remote node sees the pair of boards as a single entity.
The SS7 links and MTP2 are active on
both boards. On one board, MTP3, the higher SS7 protocol
layers and the user's application can act in a primary
(active) mode; on the other board, each layer acts
in a secondary (backup) mode. The primary MTP3 passes
MTP check-point information, including MTP's routes
and link sets, to the backup board. The primary ISUP
layer passes SS7 traffic data to the application.
The application can check-point the information to
the backup ISUP layer. In providing SCCP/TCAP redundancy,
these layers perform check-pointing directly between
the primary and secondary boards before passing the
results to the application.
A fast LAN between a primary and secondary
board provides a way for each system to monitor the
health and status of each other. In the event of a
failure, the back-up board takes over and uses the
check-pointed data both to know the current state
of the SS7 network and to allow stable calls to remain
up. The remote node views the failure of the primary
board as it would a simple link failure and is therefore
able to automatically handle the board or chassis
failure as specified within the SS7 protocol.
Natural
Access Program Development
Natural Access is an NMS programming
environment that allows developers without detailed
SS7 knowledge to write application interfaces to SS7
APIs. Natural Access essentially provides a software
shell around SS7 code, making the code transparent
to the host-level operating system. In this way, Natural
Access promotes faster development time and easier
interfacing for the user.
TX Series Platform
NMS SS7 Version 3.x supports the TX3220
(PCI) and TX3220C (CompactPCI) platforms.
Technical Specifications:
Supported SS7 Protocols
- MTP Layers 1 to 3 with redundancy
- ISUP with redundancy
- TUP with redundancy
- SCCP with redundancy
- TCAP with redundancy
Supported Host Operating Systems
- Solaris 8 (32-bit mode) for Intel®
x86 and SPARC® chips
- Windows NT and Windows 2000
Programming Modules
- Data APIs for ISUP, TUP, SCCP, TCAP,
and MTP Layer 3
- Management APIs for ISUP, TUP, SCCP,
TCAP, and MTP Layers 2 and 3
- Natural Access-based Health Management
API for platform redundancy management
Compliance
The NMS SS7 protocol stack implements
the following functions and is compliant with the
listed recommendations. In addition, users can take
advantage of NMS Communications' Global Messaging
Toolkit, which allows users to create support for
any ETSI, ITU, or ANSI-based ISUP variant.
MTP
- ETS 300-008-1, 300-308-2, ETSI, 1997
- GF001-9001 (SS7 for National Telephone
Network of China)
- Q.701-702, ITU-T, 1992
- Q.703-704, ITU-T, 1996
- Q.707, ITU-T, 1992
- Q.781-782, ITU-T, 1996
- T1.111, 234, ANSI, 1992
ISUP
- China ISUP
- EN 300-356-1, ETSI ISUP V.3, 1998
- ETS 300-121, ETSI ISUP V.1, 1992
- ETS 300-356-1, ETSI ISUP V.2, 1995
- ETS 300-356-33, ETSI
- Q.730-737, ITU-T, 1992
- Q.761-764, ITU-T, 1997
- Q.767, ITU-T, 1992
- Q.784, ITU-T, 1996-1997
- T1.113, 236, ANSI, 1995
TUP
- Q.721–725, ITU-T, 1992
- Q.783, ITU-T, 1992
- GF001-9001
SCCP
- Q.711-715, ITU-T, 1996
- Q.786, ITU-T
- T1.112, 235, ANSI, 1995
TCAP
- Q.771-775, 787, ITU-T, 1997
- T1.114, ANSI, 1992
Worldwide Deployment
NMS customers have successfully deployed
SS7 equipment in major networks such as AT&T,
British Telecom, Chung Hwa Telecom, Deutsche Telekom,
France Telecom, NTT, Orange, Telefonica, Telstra,
and others. NMS has enabled its customers to deploy
SS7 in the following countries:
- Argentina
- Australia
- Austria
- Brazil
- Belgium
- Cambodia
- Canada
- China
- Colombia
- Croatia
- Czech Republic
- Finland
- France
- Germany
- Haiti
- Hungary
- Iceland
- Indonesia
- Ireland
- Israel
- Italy
- Japan
- Korea
- Lithuania
- Malaysia
- Mexico
- Monaco
- The Netherlands
- New Zealand
- Norway
- Philippines
- Russia
- Singapore
- South Africa
- Spain
- Sri Lanka
- Surinam
- Sweden
- Switzerland
- Taiwan
- Thailand
- United Kingdom
- United States
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