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DECLoop™ Wireless Local Loop system is
designed to provide simultaneous circuit switched voice and medium-rate
connectivity at homes and offices. Based on MC-TDMA standard specifications, DECLoop™
provides a complete wireless access solution for new and expanding
telecommunication networks at a cost and service quality comparable to wired
networks.
System Features
• A telecommunication infrastructure system for wireless local
loop application
• Toll quality voice (32kbps ADPCM)
• High speed Internet connectivity (sustained 70kbps)
• Simultaneous voice and data
• Dynamic Channel Allocation (no frequency planning)
• Minimal initial infrastructure cost
• Cost-effective and highly scalable WLL solution
• Faster financial return
System Architecture
The basic system consists of DECT Interface Unit (DIU), Compact Base station
(CBS) and Single Subscriber Unit (SSU).
DIU (DECT Interface Unit)
The DIU is a DECT exchange for wireless subscribers and provides an
interface to the Public Switched Telephone Network (PSTN). Functions such as
call processing, CBS powering and PCM/ADPCM transcoding are handled by the DIU.
CBS (Compact Base Station) more
info...
The CBS is a small, unobtrusive pole or wall mounted unit providing 12
simultaneous speech channels. Each CBS can serve 30-70 subscribers and to cater
for high subscriber densities, several CBSs can be co-located.
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SSU
(Single Subscriber Unit - Data Modem)
more info ...
The Single Subscriber Unit - Data Modem is the new generation of
fixed subscriber terminal in the DECLoop ™ system. The SSU/Data
Modem offers direct Internet connectivity.
MW (Multi-Wallset)
The Multi-Wallset provides simultaneous voice service to four
subscribers. It has all the features of the WS, but at a significantly lower
per-line cost.
RBS (Relay Base Station)
A Relay Base Station extends the range of the DECLoop™ system
by relaying DECT packets between the CBS and subscriber units. The RBS can
handle 11 calls simultaneously.
BSD (Base Station Distributor)
The BSD is an optional unit used for the remote deployment of base
stations through an E1 link over microwave, fiber or copper links. Each BSD can
support upto four base.
NMS (Network Management System)
The DECLoop™ system provides a Network Management System that
can be used to manage up to 30 DIU’s & their subscribers.
OMC (Operation and Maintenance Console)
It provides a userfriendly interface to the system administrator/Operator. OMC
handles system administration, maintenance, call control, billing, traffic
measurement and subscriber functions.
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Key Specifications
| Number of Subscribers |
1000 (Maximum); per DIU |
| Number of CBS |
20 (Maximum); per DIU |
| Number of BSDs |
5 (Maximum); per DIU |
| Operating Frequency (Mhz) |
DB1 1880 – 1900
DB2 1900 – 1920
DB3 1910 – 1930 |
| Redundancy |
Hot Standby provided for all single point failures, except
failure of
interface cards. |
| Network Configuration |
Local Exchange with R2MF signaling on E1 interface. Access unit
with V5.2 interface on E1 lines. DID-PBX with R2-MF signaling on E1 lines &
Two-wire junction lines. PABX with two wire junction lines. |
| Busy Hour Call Attempts (BHCA) |
20,000 |
Maximum Traffic
per CBS |
5 erlang at 0.5% blocking; supports typically 33 subscribers at
0.15 Erlang/sub. 50 subscribers at 0.1 Erlang/sub. & 70 subscribers at 0.07
Erlang/sub |
| Voice Coding |
Toll Quality, 32 kbps ADPCM as per ITU T G. 726 |
| Instruments Supported |
Standard two wire telephone or payphone with battery reversal
& 16/12 KHz (optional) metering pulse. Modems up to 9.6 kbps, G3 Fax. RS
232 Interface to PC for 35 or 70 kbps internet access |
| Number of Tones |
Up to 11 |
| Number of 3 party conferences |
8 |
| Number of Announcements |
10 (2 six-second segments played alternately for each
announcement.) |
| Modulation |
GFSK, MC-TDMA |
| Data Transmission Rate |
Up to 32 kbps (simultaneous voice and data) or up to 64 kbps data
only. |
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Network Expansion
Since WLL subsystems can be added as and when needed,
network planning is simplified and network deployment can be
achieved more quickly and at a much lower cost.
| 1. Initial set up |
2. Add SSU/Data Modem |
| 3. Add Base Stations |
4. Add DIUs |
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Range of Transmission
Some WLL systems use high power transmitters in order to extend their range of
transmission. In contrast, in the DECloop™ system, the long range is
achieved using cost effective Relay Base Station for
up to 25 Km coverage and the Base Station Distributor
for even longer distances.
 
Using an omni-directional antenna, one CBS
can cover an area with up to 4km |
The range can be extended to up to 10km LOS, using directional antenna. |
The range can beextended to up to 25km LOS, using direction
alantenna and RBS.
Note: Transmission between CBS and RBS is the sameDECT standard (i.e.
1880-1900MHz, 250mW) |
| The range can be even further extended using BSD. |
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Application Diversity
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Urban Area
50,000 subscriber/km2
Micro-cells of 100m radius
having overlapping coverage. |
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Multiple CBS on street poles connected
to DIU directly or through BSD. |
Rural Area
1 subscriber/ km2 or less
Macro-cells of up to 25km radius
Multiple RBS on a single tower can serve desired number of subscribers. |
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Internet Connectivity more info ...
With DECLoop™, subscribers can enjoy Internet
connectivity at 70 kbps or have simultaneous voice and Internet
access at sustained 35 kbps. The ethernet port on the SSU/Data
Modem provides a direct connection to a PC.
With the use of a Remote Access Switch, the Internet traffic is separated and
diverted to the ISP network, thereby reducing the traffic congestion on the
PSTN.
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