LANCOM 1781AW

Description

• mémoire
• mémoire - matière potentielle : spaces
• mémoire - matière potentielle : space
• exposé - matière potentielle : with symbols for rapid understanding of objects

LANCOM 1781AW High-performance VPN router with ADSL2+ and 802.11n WLAN for professional site connectivity 1 Fast Internet access and professional networking for smaller companies and branch offices 1 Integrated multimode ADSL2+ modem and energy-efficient Gigabit switch as per IEEE 802.3az 1 Secure 300 Mbps Dual-band WLAN as per IEEE 802.11n with WPA2 and up to 8 WLAN SSIDs 1 VPN site connectivity with 5 simultaneous IPsec VPN channels (25 channels optional) 1 Network virtualization with up to 16 virtual networks on one device (ARF) 1 Stateful-inspection firewall with intrusion detection/denial-of-service protection 1 High availability with optional 3

• 2.4 ghz
• lancom
• automatic rate selection
• umts usb modem
• umts-support
• lancom wlan controller
• vpn
• configuration
• ip
• access

Sujets

• Mémoire
• Spaces
• West Germany
• Microsoft
• Configuration
• Support
• Automatic

Informations

• Publié par: zeyk
• Nombre de lectures: 47
• Langue: English
• Poids de l'ouvrage: 1 Mo

Extrait

WHITE PAPER
Interconnecting TETRA systems CONTENTS
1. Preface 4
2. Why was the TETRA ISI conceived? 5
3. What precisely is the TETRA ISI? 6
4. How will the TETRA ISI be used? 8
5. When will the TETRA ISI be realised? 10
6. How will the TETRA ISI market evolve? 12
7. Appendix 1 – ISI IOP Phasing 14
8. Appendix 2 - Myth versus Reality 16
9. References 19
3 WHITE PAPER - Interconnecting TETRA systems1. PREFACE
The TETRA standard is a suite of standards It is also evident that ISI might be too heavy
covering different radio and network technology an interface to enable smaller systems to be
aspects, for example, air interfaces, network interconnected; when there is no need to have fully
interfaces and its services and facilities. independent feet maps nor a need for advanced
security features, the need for a full ISI represents
Most of those interfaces have been successfully overkill to many of these customers. These small
implemented and have been in daily operation standalone systems are predominantly based on
around the globe for over a decade. packet switching technologies, whereas the full ISI
demands QSIG and ROSE circuit based protocols
Amongst the many promises that have been
that represent unwanted complexity and operating
delivered by the TETRA standard to its users, the
costs. As a consequence, various bespoke
only interface promise which has not yet been
solutions have materialised from different suppliers
met is the Inter-System Interface (ISI) – however
for connecting these systems together whilst
this interface is now gaining momentum within
avoiding the need for a full ISI, many of which are
the industry and amongst customers. The frst
gravitating towards use of IP connectivity with a
IOP certifcates between two independent
well defned API and offering the equivalent of a
manufacturers have recently been issued in April
smaller subset of ISI services.
12009 . We haven’t reached cruising altitude with
ISI, but we are now fnally airborne. This paper will be updated regularly to refect
progress towards, and the remaining challenges
The lessons learned over the last few years have
associated with, the delivery of a TETRA ISI
shown that ISI has become a victim of competition.
solution for the purpose with which it was originally
It has repeatedly been sought by the marketplace,
intended, i.e. cross-border communications. In
and indeed was one of the overriding ambitions of
addition, the paper will also discuss the possibilities
the many proponents of TETRA, and yet industry
to use IP to interconnect smaller systems.
has struggled to deliver. Why?
However, before we go there, with reference
It has become obvious that even to the inner
to its strategic importance within Public Safety
circles of the TETRA community there is no
Communications and Private Mobile Radio, the
real common baseline of knowledge on ISI –
questions this paper will frst address are as
one community say ISI is available, enabling
follows:
seamless connectivity between two independent
but connected systems, whilst others are more • Why was the TETRA ISI conceived?
conservative. This paper is intended to educate
on the complexity of ISI, to cut through the • What precisely is the TETRA ISI?
marketing promises, and act as a reference for the
• How should the TETRA ISI be used?marketplace separating facts from fction, reality
versus myth.
• When will the TETRA ISI be realised?
1 http://www.tetra-association.com/uploadedFiles/Using_TETRA/Interoperability/Certifcates/Certifcate_v1_TetraSystemRel55EADI_
DimetraIP61-ISIMotI_0309.pdf
4 WHITE PAPER - Interconnecting TETRA systems2. WHY WAS THE TETRA ISI CONCEIVED?
Synopsis: The concept of cross-border From 1990, requirements began emerging
communications between nations, particularly within the PMR community for a common digital
within Europe, using a single technology was communications technology that could achieve
one of the key motivations behind the TETRA the economies of scale needed by governments
standard. focused on ever reducing budgets, whilst arming
end-users with the latest innovations. ETSI,
The Schengen Agreements (circa 1985 & 1990) borrowing from the successful standardisation
and subsequent Acquis that were made provisions framework of GSM, therefore initiated work on the
of European Union law, were driven primarily by: Trans-European TRunked RAdio (TETRA); later to
be renamed to TErrestrial Trunked RAdio due to its
• Abolition of systematic border controls between
worldwide appeal.
nations within the EU
By moving towards a single technology,
• Harmonisation of external border controls of governments were able to procure a single
the EU nationwide communications infrastructure,
replacing the plethora of analogue and proprietary • Cross-border cooperation of Police and Customs
regional systems. Tendering for such a system on organisations
a nationwide scale would drive value for money,
as suppliers would be prepared to offer higher Whilst the last of the Schengen Agreements
discounts due to the increased volume of business were signed, the European Telecommunications
versus regional system procurement. Terminal Standardisation Institute (ETSI) was demonstrating
interoperability with any network provider would growing signs of success with the Global System
ensure strong competition, driving up functionality for Mobile communications (GSM) standard for
and lowering costs to end-users.mass consumer, revenue generating, point-to-point
telephony calls.
TETRA’s mandate was clear, its focus would
be meeting the needs of mission critical end-
user organisations seeking access to the latest
digital innovations for increasing their operational
capabilities and effectiveness, replacing MPT1327
plus other legacy PMR systems and addressing
newly emerging PMR needs, whilst importantly
for governments it would provide value for
money through competition (in the form of
interoperability). However, there was also a longer
term vision behind TETRA, aligned with that of the
principals behind the Schengen Agreements, i.e.
to provide European cross-border communications
capability between nations to combat international
crime, terrorism and manage major crisis within
the EU more effectively; these nations operating
their own independent secure and reliable TETRA
networks.
At that time, many were sceptical that this utopian
‘cross-border’ vision could be realised, certainly
within their lifetime. Since then, proponents of
TETRA have worked long and hard with unrelenting
enthusiasm, drive and ambition to infuence their
own colleagues, key decision-makers, suppliers
and partners in pursuit of this ‘cross-border’ vision.
Daily news reinforces the need for nations to
cooperate in order to defeat those elements intent
on causing harm. Despite these valiant efforts and
the successes with terminal interoperability, the
TETRA Inter-System Interface (ISI) is still not in
operation today.
More recently, now that TETRA nationwide
networks are in common place, a number of
governments within the EU (and for that matter
other nations) are deploying nationwide crime
fghting forces with the remit to operate anywhere
within their borders, enabled in part by the
seamless roaming capability that the network now
offers them.
Figure 1: Deployment of Nationwide TETRA Networks
5 WHITE PAPER - Interconnecting TETRA systems3. WHAT PRECISELY IS THE TETRA ISI?
Synopsis: The TETRA ISI represents a set of To date, infrastructure and terminal manufacturers
basic services necessary to support ‘break- have collectively invested over a billion Euro (est.)
connect’ cross-border communications in research and development in TETRA, yielding
between independently owned and operated a rich, diverse and comprehensive set of services
TETRA networks; relative to the TETRA air within a TETRA network between infrastructure
interface today, it will provide a limited subset and terminals.
of TETRA services.
TETRA ISI has become a chicken and egg situation.
Government users needing ISI wanting to see The TETRA ISI is not a new addition to the ETSI
and feel the product in advance, but there was standard. ETSI standardisation of the TETRA
no justifcation for the large R&D investment Air Interface and Inter-System Interface began
necessary to provide even a basic set of way back in 1990. Standardisation of the ISI
services between these complex and markedly was then put on hold a few years later, diverting
different infrastructures provided by different resources onto completion of the air interface
manufacturers. terminal standard, which was seen as the
overriding priority amongst end-users at that
Unlike the ‘roaming’ capability in GSM systems, time; it was deemed more important to get the
which was driven by the business opportunity national networks implemented with the greatest
to generate substantial new revenue streams level of functionality. Note that the projected
for international operators, the TETRA ISI was development costs for the TETRA ISI were
expected to be used by a few users from each considered substantial, e