Norsk Telefoningeniørmøte 1992 - Telenor

its initial configuration, the A1570 uses
separate fibres for telecom and distributive
services.
Also, the initial applications will be for
narrowband telecom services (voice,
ISDN BA and PRA) and analogue standard
TV/HIFI/Digital radio.
Erbium doped fibre amplifiers are
inserted at the originating end of the fibre
for the TV/HIFI distribution part (35
channels). At a later stage, ATM-based
transmission will be introduced together
with a gradual transition to FTTH, when
broadband telecom services are required.
Also digital TV distribution will be
added at a later stage.
The A1570 may be used either as a pure
telecom services or CATV distribution
system or as a combined CATV and
telecom services access network.
Broadband: Scenarios of
evolution and Alcatel’s
product strategy
Transmission
It is clear that SDH will revolutionise
transmission networks. Such a revolution
is necessary as with higher and higher
bitrates the consequences of a single link
failure can be extremely important. SDH
provides the possibilities, through ring
structures and rerouting possibilities, to
reduce these effects. At the same time a
much wider range of bitrates means more
and more multiplexing and demultiplexing.
The use of virtual containers in
SDH allows to have an add/drop
functionality. Finally much more powerful
network management capabilities
allow a much better management of the
network resources.
It is clear however that the situation of
the network is quite different in the various
countries and that as a consequence
the strategy of introduction is different.
In any case compatibility with
plexichronous products is a requirement
to allow incremental introduction into
existing networks. In presenting a full
family of products Alcatel is able to meet
the constraints of the various networks.
Broadband Switching
In general Alcatel expects four distinct
phases in the evolution of present-day
networks to a full broadband ISDN.
Phase 1: Introduction of Metropolitan
Area Networks to meet the demand for
early broadband services. This phase has
already started in Europe and the US.
Some details on this phase were given
earlier in the section on the A1190 MAN.
Phase 2: At this point, early ATM products
i.e. the A1010 Multiplexers/
Crossconnects and A1191 Connectionless
Servers, are introduced. These elements
can be deployed for network
optimisation of high-speed point-to-point
and connectionless server traffic. Specifically
they can be used for efficient
interlinking of MANs and for fully
ATM-based high-speed leased line and
connectionless services offerings.
Alcatel already has a commitment in
France to provide a high-speed leasedline
data network (IRLE) with a pilot in
1993 and commercial operation in 1994.
Phase 3: At this point, switched ATM
broadband services are introduced, based
on A1000 ATM switching units either as
broadband extension to A1000 S12/E10
narrowband exchanges or in stand alone
configuration. Where an initial broadband
infrastructure (A1190, A1010,
A1191) is already in place, it may be
incorporated in this new structure.
Obviously, the broadband A1000 ATM
switching units will be linked to the
existing narrowband network for compatible
services.
Phase 4: During the latter part of this
decade, full ATM-based Alcatel 1000
switches will become available handling
both narrowband and broadband services
competitively in a single ATM switch.
Fibre in the Loop
As mentioned before Fibre in the Loop is
a necessity for a general introduction of
broadband services.
At the same time operators are beginning
to reason that new outside plant investments
must be “future-safe” and hence
should be for fibre instead of copper
wires.
This is particularly the case in East-
Germany where the needs for new
infrastructure are very important.
Nevertheless the danger remains that
investments will not be future-safe due to
short term cost considerations or
regulatory limitations.
Conclusion
As you have been able to see at Telecom
Geneva 1991 Alcatel is in the process of
introducing to the market all products
required for the construction of broadband
ISDN networks.
The success of B-ISDN will be determined
by a number of factors.
- The ability of the standardisation
bodies, in particular ETSI, to keep up
with the market needs.
- The availability of Fibre in the Loop
- The availability of terminals
- The introduction of basic services and
international connectivity
- The right tariff policy.
On all of these points the ISDN experience
has been disappointing. We need a
much closer co-operation between
operators and suppliers for the introduction
of broadband to avoid a repetition
of the ISDN experience.
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