X.400 Messaging
Whitepapers with a special relevance to those with an interest in
X.400 Messaging together with those of a more general
relevance to those with an interest in X.400.
Testing STANAG 4406 Military Messaging over IP Differentiated Services
IP Differentiated Services (DiffServ) is a standardized Internet approach for dealing with different classes of traffic. We have added support for differentiated services to M-Switch X.400, so that its priority handling (which supports standard X.400 three level priority, and the STANAG 4406 military messaging six level priority) can utilize differentiated services at the IP level. Isode and NATO staff put together a setup to test military messaging in conjunction with DiffServ, and ran tests on two days in August and November 2007. This paper describes the tests that were done and analyses the results.
(20th Dec 2007)
M-Switch
X.400 Benchmarks
This paper gives performance benchmarks for Isode's M-Switch X.400,
a high-performance X.400 Message Transfer Agent. M-Switch X.400 is
deployed by Isode customers in a number of solutions areas and these
benchmarks re-enforce our belief that M-Switch X.400 is substantially
faster than any other X.400 MTA.
(20th Nov 2007)
Why use a P7 Message Store? Getting
X.400 messages to and from end-users
The goal of this paper is to give an understanding of what an X.400
Message Store, such as Isode’s M-Store X.400 does, and where
and how it should be used. In order to do this, the paper looks at
general requirements for sending and receiving (X.400) messages, and
looks at various approaches that can be taken.
(19th June 2007)
M-Store X.400 Benchmarks
This paper provides performance benchmarks for Isode's M-Store X.400
product (R14) in a number of common usage scenarios including core
P3 and P7 operations, throughput tests and handling of large messages.
(31st May 2007)
X.400 Bridgehead for Microsoft Exchange:
Technical Architecture and Back-end Features
X.400 Bridgehead for Microsoft Exchange ("X.400 Bridgehead")
is a new product from Boldon James, produced in collaboration with
Isode. It's primary goal is to provide X.400 protocol connectivity
for Microsoft Exchange 2007, this capability was provided as a part
of Exchange 2003 and earlier versions, but is not included with Exchange
2007. This paper describes the architecture of X.400 Bridgehead, and
summarizes it's key features. It is particularly oriented towards
understanding the capabilities of X.400 Bridgehead in the context
of older versions of Exchange and full X.400 Message Transfer Agents
(MTAs).
(11th May 2007)
Sending FLASH Messages Quickly: Techniques
for Low Latency Message Switching and Precedence Handling
Military Messaging systems, and other messaging systems with time
critical operational requirements such as Aviation (AMHS), require
that high precedence messages are submitted, transferred and delivered
very quickly. In this paper we look at how messages can be handled
to achieve message switching times of a few hundred milli-seconds,
for both low and high volumes of traffic. The importance of Permanent
Associations as a way of avoiding delays in opening a connection is
described and consideration is given to Precedence Handling, describing
techniques that ensure high precedence traffic gets optimum (low)
latency.
(9th May 2007)
Packaging
Military Messaging for HF Radio and other Low Bandwidth Links
The general requirements and protocol architecture for military messaging
over low bandwidth communications were described in the Isode White
Paper Military Messaging Over Low Bandwidth
Networks. This paper looks in more detail at how various server
components are packaged together, looking at both software and hardware
combinations, and showing how users and user agents fit into the system.
The paper looks in detail at single user systems, from both hardware
and software perspective.
(15th Feb 2007)
Offline Editing,
Testing and Version Management of Messaging Configurations
Isode's messaging configuration is held in the directory, providing
a number of benefits, including client/server GUI management of configuration
and the ability to share configuration data between multiple servers.
This paper explains how this core architecture, as well as providing
a means of editing and manaing a live configuration, is extended to
support offline configuration development and review, configuration
testing and configuration version management.
(1st Dec 2006)
Military Messaging
Over Low Bandwidth Networks
Military Messages often need to be transferred over low bandwidth
networks such as HF radio and other "constrained communication
channels". The two military specifications which have evolved
to deal with such a messaging environment are ACP 142 and NATO's STANAG
4406 Annexe E. This paper describes scenarios that require these special
technologies, gives an overview of the technologies describes Isode's
approach to implementing them.
(22nd June 2006)
Why X.400 is
good for high reliability messaging
X.400 was specified in the 1980s, with the expectation that it would
be the universal standard for email. While this did not happen, X.400
is still used for many applications, particularly where high reliability
is required. This paper summarizes the key features of X.400 that
make it good for applications needing high reliability, with particular
focus on capabilities not available with Internet email.
(11th May 2006)
X.400 Technology for Internet Service
Providers
Isode markets its X.400 and Internet messaging solutions as different
products. However, Isode's core M-Switch product is the same for both
X.400 and Internet deployments, with some modules specific to Internet
and X.400 deployments. This white paper looks at features which are
present in Isode's products primarily to address X.400 markets, but
can add significant value to ISP messaging deployments.
(21st Sept 2004)
General
SNMP and Isode Servers
This white paper looks at the role of SNMP (Simple Network Management
Protocol) in managing systems using Isode messaging and directory
servers. It explains why SNMP support is provided, the sub-agent architecture
used by Isode products, and approaches to deploying SNMP monitoring.
(29th May 2007)
Operational Monitoring and
Control of Systems using Isode Servers
Isode server products are deployed in a wide variety of situations,
and usually there is a high service reliance placed on them. Isode’s
approach to server design and management is that the products are
building blocks, with maximum use of open standard protocols for interconnection.
Management is almost entirely client/server. This combination of building
block + client/server means that the approach to operational management
needs to be considered as part of the overall system design. This
paper explains the approach Isode has taken and the options provided,
that can be used to build an operational system.
(1st March 2006)
Delivering the ATS Message Service to
the End User using AMHS
AMHS (Air Traffic Services (ATS) Message Handling Services), as specified
in the ICAO ATN (Aeronautical Telecommunications Network) SARPs, is
the new standard for ground to ground messaging communications. The
"ATS Message Service" is the end to end message service
that AMHS provides. AMHS specifies the service, and the underlying
infrastructure that is used in order to provide this service. To build
a complete system, the ATS Message Service needs to be provided to
end users, sitting at terminals. This paper looks at various approaches
to doing this.
(14th Dec 2004)
Monitoring and Managing Messaging
Deployments with Very High Service Requirements: Isode Servers and
Sentra
In order to provide a very high grade messaging service, it is critical
to monitor the service and be able to take action where problems are
detected. This white paper looks at various approaches to monitoring
systems containing the Isode servers, and in particular looks at use
of the Sentra product from Insider Technologies.
(2nd Nov 2004)
Isode Management Architecture:
Client/Server and Directory
Isode's core business is messaging and directory servers. Isode products
are designed for service oriented environments, such as ISPs, military,
government and aviation. These are environments where there are stringent
management requirements. This white paper sets out the approaches
that Isode takes to address management requirements.
(21st Sept 2004)
Addressing in AMHS: Building a solution
that works for the end-user
AMHS provides a complex addressing scheme, which is used in conjunction
with the ATN Directory. Users need
to address messages, and the complexity of the AMHS addressing has
potential to make this difficult. This whitepaper explains how AMHS
and the ATN Directory can be used together to provide a simple and
effective user experience.
(14th Sept 2004)