What is a Wireless IP Local Loop System ?
WML is a high capacity point to multipoint wireless
wide area networking system
that utilizes IP technology, with an operating
range in excess of up to 20 km line of sight (LOS).
It carries voice,
video & data services on a single platform over the metropolitan
It supports Quality of Service (QoS) and Bandwidth on Demand
It features an IP based air interface and industry standard
It is modular in design and interworks easily with existing
IP LAN and WAN technologies.
Its modular design and many integrated
features ensure that the entry cost is low and the incremental costs are
kept low, whilst at the same time allowing the system to scale to support
thousands of remote sites from a single base station.
the construction of high capacity broadband wireless access (BWA) networks
taking IP services to remote users.
WMLis cheaper, faster to deploy,
more flexible and more scalable than competing fibre or copper based
solutions and competing vendors' BWA offerings.
Advantages for VoIP
Guaranteed bandwidth per user
(configureable up to 4Mbps)
Same speed in both directions (Uplink /
Packet prioritazion for all Voice packets
quality of voice among all users within the Metropolitan
There are a number of versions of WML, built from the
same modules and which offer the same functional features:
version - designed for public and enterprise networks alike,
version – designed for the North American MMDS band
- designed to work within the licensed radio bands and as such would only
be deployed by licence holders in that band, typically Service Providers
who would sell on services.
When to use WML ?
If the requirement is:
Broadband IP network for
multiple sites and/or
High-speed data-centric services
Multiple services data, VoIP, video and/or
short timescales to deploy and/or
High bandwidth (higher than available
on copper) and/or
Or there is:
No existing fibre, with none in prospect and/or
existing DSL, with none in prospect and/or
Cost sensitivity, (per user
wireline connection charge) and/or
Cost sensitivity, (per user wireline
rental charge) and/or
1) High-speed data
WML customers can enjoy the benefits of highspeed,
'always-on' data access thanks to having burst rates of up to 4 Mbit/s -
80 times faster than the fastest dial-up PSTN modem. WML uses available
sector bandwidth intelligently: Bandwidth is assigned only when there is a
data packet to transmit. With WML, it is possible to take advantage of
statistical gain over the air interface and oversubscribe the available
bandwidth without degrading the delivered performance.
2) High-speed Internet access
One of the advantages of WML is that users are 'always
on': there is no need to dial-up the service provider first, making it
easier and more fun to access the Internet. Users need only open their web
browser or e-mail program to be instantly connected. WML can also
distinguish between applications and users, enabling the operator to
provide different classes of service to users.
WML provides a solution for voice as well as data.
Standard telephone instruments are connected to a Integrated Access Device
(IAD) which in turn communicates over WML with a Media Gateway (MG)
connected to a Class 5 switch. Thanks to its open architecture, WML is
able to interwork with a number of third party IAD and MG products on the
market today, supporting a range of protocols (H.323, MGCP and SIP), as
well as a range of voice coding standards (G.711, G.723, G.729).
Multimedia over IP
The fact that WML can provide up to 4 Mbit/s of
throughput to the user, together with its ability to set different
priorities to different applications and provide QoS, make it a good
solution for enabling services such as video-over-IP and good quality
videoconferencing. The system can prioritize video packets in such a way
that delays and jitter are minimized and the video packets pass smoothly
through the system.
Metropolitan and Private Networks
WML can be used in Metropolitan networks, campus
networks and enterprise networks. In this application, WML is used to
construct a private network, which allows high-speed data, voice and
multimedia services amongst its users, as well as being connected to the
public network over an industry-standard interface such as 10/100BaseT
Ethernet. Thanks to its advanced software features WML can be used in
creating secure, virtual private networks (VPNs) between the different
locations of an enterprise.
How much is a WML System
Depending on the size of the Metropolitan area to cover,
the cost's range
between US$ 20.000 and US$ 30'000 as an
Thank's to this affordable basic cost's and the huge
savings on phone calls (VoIP), the ROI (Return of Investment) factor is a
quite high one.