From: Hellfire #1063 @1303007 VirtualNET
Date: Sun Feb 04, 1996 16:50:20 Mountain

of both the physical network and the end-user services is becoming
vital to business success. Service providers must be able to meet
customer demand for a range of services quickly, monitor service
quality and network performance, and fix faults rapidly.
 
Ericsson's Access Network Management System provides computer-based
monitoring and control of an entire access network - up to a theoretical
limit of 100,000 users - from a central location. It is the software
'glue' that will bind the mix of Ericsson Access Network hardware
elements together into a seamless network solution.
 
The system based on the successful RIDES network management system,
which was initially developed for the Ericsson Raynet LOC2i passive
optical network (PON) and RVS video distribution systems.
 
The RIDES system is well proven, having had several years of real-life
operation in fibre- and hybrid fibre-coaxial (HFC) access networks
in the USA and elsewhere. The experience gained during these years
means that RIDES has been developed into a system that offers
not only powerful real-time control of network elements, but also
supports the business needs of the service provider. It does this
through features such as inventory control, network partitioning
and scheduled service ordering (which allows circuits to be set
up before the physical network is in place - especially useful
in fast-growing networks).
 
Remote Subscriber Multiplexer (RSM)
 
The Remote Subscriber Multiplexer (RSM) is a well established
part of the AXE switching system concept. It is a multiplexer
capable of handling up to 30 subscribers, and offers a cost-effective
way of extending network digitalisation out to small groups of
subscribers in remote locations, or supporting all subscribers
in a multi-occupancy building.
 
The RSM handles PSTN and 64kbit/s data connections. Designed for
use in both rural and metropolitan networks, it concentrates the
traffic to the host AXE local exchange, but does not carry out
any traffic switching functions. Coinbox telephones can be supported.
Any or all of the RSM subscriber lines can be connected to a PBX.
 
Two RSMs can be installed in a single cabinet to support up to
60 subscribers. The system may be installed outdoors or indoors
and offers integrated operation, administration and maintenance
from the host AXE local exchange.
 
UMUX flexible multiplexer
 
The UMUX flexible access multiplexer system is designed to meet
virtually any business and residential subscriber access requirement
for voice and data services for up to 120 subscribers.
 
Using a system of standardised, modular interface cards, UMUX
can deliver a mixture of services - including PSTN, ISDN, switched
data and leased lines in bandwidths ranging from 600bit/s to 2Mbit/s
- from a single point of access. On the transmission side, UMUX
offers 2Mbit/s copper, radio and HDSL, and 8Mbit/s optical links.
 
The system enables new services to be introduced very quickly,
and by virtue of its modular architecture, can easily be adapted
to future services or new technological advances without wasting
existing investments.
 
Powerful management capabilities provide end-to-end monitoring
and configuration of subscriber circuits, while G.821-standard
performance monitoring and 1+1 protection switching capability
ensure high service reliability.
 
DIAmuX flexible multiplexer
 
DIAmuX is a flexible access system that provides a mixture of
accesses (including fibre) for services such as PSTN, ISDN, analogue
leased lines, 2Mbit/s, nx64kbit/s and V.11/V.24 data, for up to
500 subscribers.
 
The main application for DIAmuX is any situation in which subscribers
need access to a mix of PSTN and other services. This can include
mainly residential areas in which ISDN or other more advanced
accesses are required by only a few subscribers, or for businesses
that require mixed service access. DIAmuX provides a single access
xchange is still linked to one subscriber.
 
RVS optical fibre CATV and broadband delivery system
 
Ericsson Raynet Video System, RVS, provides an optical fibre alternative
to today's coaxial systems for the distribution of cable television
(CATV) and future broadband services. It is a hybrid fibre-coaxial
(HFC) system that allows CATV operators to gain the benefits of
fibre deployment while still utilising their existing coaxial
access networks.
 
RVS has a three-level system architecture with an optical trunk,
a distribution system using Passive Optical Network (PON) technology,
and a coaxial distribution system for the final drop to individual
subscribers.
 
It is a very cost-effective approach. A single RVS system can
support up to 200,000 TV subscribers per Headend. Installation
costs per subscriber are currently about the same as those for
an equivalent coaxial system. The other main benefit is the inherently
better quality compared with coaxial systems. This shows up in
the superior signal-to-noise ratio, and the significantly higher
MTBF (Mean Time Between Failures).
 
Looking to the future, an RVS optical CATV system provides a distribution
infrastructure that can relatively easily be upgraded, since the
optical parts of the network use passive techniques, with no amplifiers
that could require replacing.
 
RVS supports all main fibre architectures from fibre-to-the-feeder
nsions can be cordless. They have all the
functions and features available via conventional wired extensions.
 
Freeset will also in future be used in other public network access
applications, particularly in connection with Personal Communication
Services (PCS) and telezone (telepoint) services.
 
Freeset is based on the pan-European DECT (Digital European Cordless
Telecommunications) standard. It has been designed as a high capacity
system, able to support the high densities of telephone extensions
found in large offices and industrial sites where densities can
reach 50,000 users per square kilometre. A single radio exchange
can support up to 600 cordless extension phones, via a network
of tiny radio base stations arranged to create small 'picocells'
of 30-100m radius indoors and up to 300m outdoors.
 
Speech quality is the same as that available from a wired extension,
and there is a seamless, undetectable handover as users walk from
one base station area to another.
 
HDSL/ADSL transmission systems
 
High-bit-rate Digital Subscriber Line (HDSL) and Asymmetric Digital
Subscriber Loop (ADSL) transmission systems allow the provision
of high-bandwidth (up to 6Mbit/s) services over ordinary copper
lines over distances of several kilometres, without the need for
repeaters.
 
There is growing demand for high-bandwidth leased-line and ISDN
services for applications such as LAN-to-LAN interconnection,
videoconferencing and PBX interconnection. HDSL and ADSL help
network operators meet these new demands quickly and cost-effectively
by allowing them to exploit their existing copper networks.
 
HDSL offers the high transmission speed and quality over copper
that have previously only been available from fibre-optic links
over the same distances. New high-value services can be offered
at attractive rates by making better use of existing network facilities,
and avoiding the high costs of installing fibre all the way to
the customer.
 
There are two HDSL transmission systems in the Access Network
product portfolio: the Cobra-HTU two-pair system and the COLT-2
three-pair system.
 
The Ericsson Cobra-ATU ADSL transmission system can provide transmission
rates of up to 6Mbit/s in the downstream direction (towards the
subscriber), while providing upstream rates of a few hundred kilobits
per second. This makes it ideal for delivering subscriber-controlled
entertainment and information services.
 
For example, in services like video-on-demand, home-shopping and
information retrieval, the video signals use the high-bandwidth
downstream link, while the controlling functions only need a few
kilobits per second. However, ADSL can provide enough capacity
in both directions for applications such as video conferencing
two-way and datacommunications.
 
Digital Pair Gain Systems
 
Digital Pair Gain Systems allow a single copper subscriber line
to support between two and twelve separate subscriber accesses.
This is equivalent to an increase in the capacity of the local
access network by a factor of twelve, with no need for new subscriber
cabling.
 
This increased capacity can be used either to support new subscribers,
or bring additional accesses to existing customers. The costs
of developing an access network with Digital Pair Gain Systems
generally compare very favourably with the alternative approach
of installing additional copper cabling to each new subscriber.
 
Digital Pair Gain Systems can be used on any subscriber lines
whether served by electromechanical or fully-electronic digital
exchanges.
By allowing more users to share each digital subscriber line and
providing additional lines for existing customers (for example,
to add fax, data or PBX lines), Digital Pair Gain Systems improve
the utilisation of existing network infrastructure and boost service
revenues.
There are three Digital Pair Gain Systems in the Ericsson Access
Network portfolio: PCM-4, which allows up to four subscribers
to share the same digital subscriber line; PCM-4D, which additionally
provides 64kbit/s data capability; the Tucon 0+2, which allows

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X  20 Miles North of Nowhere  (303)932-1195  Littleton, CO   M1986-1996X   OMF  0
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