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The Goodwin Borodino-M multicell DECT standard communication system for large and medium enterprises
 
The Goodwin Borodino-M system for large and medium enterprises provides high quality communications for from 50 to 960 subscribers.

Individual distinctive properties of the system:
  • Provision of wireless mobile communication for from 50 to 960 subscribers;
  • The maximal area of radio coverage in a building — up to 48,000 sq. m (one cluster — 8000 sq. ?);
  • The maximal area of radio coverage outside of buildings — up to 18 sq. km (one cluster — 3 sq. km).
  • Link speed of the data — 32 Kbit/s.
The Goodwin Borodino-M multicell DECT standard communications systems are intended to provide multicell coverage of premises of companies with the most diverse profile and business orientation in order to render mobile communications services to their administrative-technical personnel and assure subscriber access to the telephone system of the enterprise, and with the quality of service, range of services, and the capacity of a wired system.


The common distinctive features of the Goodwin Borodino-M systems:
  • Application of the Goodwin Borodino-M systems doesn't require frequency planning;
  • Fast integration of the Goodwin Borodino-M equipment into existing communication systems of departmental and corporate operators;
  • Opportunity of connection to PABX using EDSS1 or QSIG protocols of signal system with preservation of service quality and set of services;
  • Application of 4- and 12-channel base stations providing conversation channels and channels for data transmission;
  • Authentication of subscribers and encoding of active channels via airwaves provides protection against eavesdropping on conversations;
  • The opportunity of operating in the same system of both roving subscribers (with a pedestrian range radius of up to 300 m from the base station), and stationary subscribers;
  • Application of the GAP-compatible portable and terminal subscriber equipment as subscriber devices;
  • System management and maintenance service from any terminal of a local computer network (LAN);
  • Fast and simple installation of equipment with opportunity of escalating;
  • Remote synchronization and base station feed at a distance of up to 2 km;
  • Possibility of use in enterprises' explosive zones.

The Goodwin Borodino-M systems allow you:
  • To provide mobility of employees and their availability at any time and in any place on the premises of the enterprise;
  • To reduce city telephone charges and use city lines more rationally;
  • To provide confidentiality of radiotelephone negotiations and impossibility of non-authorized connection to them.

2.1. The organization of communication scheme and principles of work of the Goodwin Borodino-M system for large and medium enterprises


The circuit of communication organization in the Goodwin Borodino-M system for large and medium enterprises is shown in Fig. 2.

The structure of the Goodwin Borodino-M system for large and medium enterprises consists of:
  • Base station controller (BSC);
  • Base stations (BS);
  • Base station multiplexer (BSM);
  • Data transfer controller (DTC);
  • Cordless terminal adapters (CTA);
  • Handsets (HS);
  • Subscriber devices (SD);
  • Operator workplace (WPO).


2.1.1.
The base station controller (BSC) provides functions for organizing the interface with ISDN, the protocol support for the radio channel (establishment of the connection, identification, etc.), and assuring the functioning of the DECT network (subscriber search, procedure of hand-over in one cluster, roaming in multicluster system, etc.).

The BSC is connected to ISDN through one or two E1 communication lines through the ?DSS1 or QSIG signal protocol.

One E1 interface provides 30 communication links. Thus, in the Goodwin Borodino system, from 30 to 60 subscribers simultaneously can have access to ISDN. The BSC-Upn has 16 Upn lines for communication with the base stations and one E1 line for communication with an automatic telephone exchange.

The BSC-E1 has 8 E1 lines of which from 1 to 4 lines can be used for communication with an automatic telephone exchange and the rest for communication with the base station multiplexer (BSM).

The BSC is placed in a standard 19" rack and draws its power from a 60-watt direct current network. To assure trouble-free operation of the BSC in a situation when there is a loss of voltage in an initial network, an uninterruptible power supply (UPS) should be used.

The BSC is installed inside rooms, besides that it can be installed in the rooms of an automatic telephone exchange or it can be operated remotely, using the transfer systems available to the operator.


2.1.2. Base Stations


The base stations (BS) are intended for organization of the radio channel providing access of subscribers' Cordless Terminal Adapters to the Goodwin Borodino system.

The base station with the Upn interface is connected to the BSC-Upn or BSC-E1 through the Upn type base station multiplexer (BSM) that divides the general E1 flow into several Upn flows.

The base station with the Upn interface provides 4 conversation channels. Thus, through one BS-Upn 4 subscribers can have simultaneous access to the communication system. The recommended number of subscribers that can be served by one BS-Upn is 5…20 subscribers.


2.1.3. Base Station Multiplexer


The base station multiplexer (BSM) is intended for division/unification of the ?1 flow from BSC to BS-Upn.

The base station multiplexer with the Upn interface is intended for dividing/ unifying and transforming the ?1 flow extending from the BSC and containing 30 B-channels into 16 separate 2 B-channel Upn flows. Thus, 16 BS-Upn can be connected to one BSM-Upn.


2.1.4. Cordless Terminal Adapters


The cordless terminal adapter (CTA) is intended for maintenance of the user's radio access to the base station. The CTA is a DECT-GAP standard stationary device which has a subscriber's double-wire ending (a/b interface) for connection of subscribers' devices (SD) certificated by the Ministry of Communication and Information of the Russian Federation


2.1.5. Handsets


Handsets (HS) are intended for maintaining radio access of mobile users to BS-E1 and represent a DECT Standard GAP-type wireless radio telephone receiver. As HS it is possible to use GAP-type DECT standard receivers, which have been awarded the conformity certificate of the Ministry of Communication and Information of the Russian Federation.


2.1.6. Data Transfer Controller


The structure of the BSC includes an additional module — data transfer controller (DTC ) in order to assure data transfer.


2.1.7.Subscriber Devices


Telephone sets of various types and manufacturers with proper frequency and pulse set, as well as faxes and modems, can be used as subscriber devices (SD). Even the use of some kinds of pay phone is possible. SDs are connected to the CTA through the same two-wire subscriber lines as a standard telephone network. The link speed of the data is 32 kbit/s.


2.2. Operator Workplace


The operator workplace (WPO) is for the use and convenience of the systems management operator in fulfilling system requirements (configuring of the system, registration/deregistration of subscribers, etc.), maintenance service, and equipment diagnostics. The WPO computer is connected to the BSC through the modem or Ethernet network.


2.3. Antenna-feeder Devices


The base stations have two HF-sockets for connection of antenna-feeder devices (AFD).

Antennas may be built in the case of BS (inside antennas) as well as placed outside the case (outside antennas). The BS-Upn has inside antennas and outside antennas.

In the Goodwin Borodino system certificated antennas, feeders and sockets of foreign companies such as Huber & Suhner, Kathrein, AMP, Amphenol as well as of domestic producers are used.

This variation of the Goodwin Borodino-M multicell system is intended for use on the premises of large and medium enterprises in order to provide subscribers with wireless access to Private Automatic Branch Exchange (PABX).



Fig.2. The organization of communication scheme of the Goodwin Borodino-M system for large and medium enterprises



2.4. The characteristics of the Goodwin Borodino-M system for large and medium enterprises


Information about the capacity of the communication system, consisting of one cluster, is provided in Table 1.

Table 1

Parameter Value
Maximum number of access lines on initial speed to ISDN 4
Maximum number of BSs in the system 96
Maximum number of CTAs and handsets in the system 320
Maximum number of simultaneous conversations in one BS of Upn type 4
Maximum number of simultaneous conversations in the system 120
The maximal distance of BS of Upn type from BSC without regenerator use, km (AWG 22) 2,0
The maximal distance of CTAs and handsets from BS, m 300



2.5. Connection of the Goodwin Borodino system to a public telephone network


The Goodwin Borodino system is connected to ISDN through the E1 interface with the EDSS1 or QSIG signal protocol.


2.6. Goodwin Borodino system access control


The Goodwin Borodino system has two types of registration for subscriber equipment:
  • On-air registration;
  • Hand-operated registration for some types of CTA.
The European Telecommunications Standards Institute (ETSI) has officially provided the Goodwin company with the DECT standard manufacturer and installation codes for this equipment. On the basis of these codes each Goodwin Borodino communication system receives its own code at installation.

Each DECT standard CTA and hand set also has its own code. The CTA and handsets retain the system codes under which they were registered. The BSC retains the individual codes of the registered CTAs. The identification of codes by certain algorithm is performed at each search. Thus the codes which the BSC and CTA (or HS) exchange are broadcast only after the addition of random numbers to these codes in compliance with standard DECT procedure. This prevents unauthorized receiving and usage of the data at the current control of the air interface.

The operator can manage the access process by registration and deregistration (connecting and disconnecting from service) of system subscribers. The number of registered subscribers in the system is determined by the software configuration of the BS controller and can be changed upon upgrade of the system.


2.7. The parameters of the Goodwin Borodino system radio interface


The parameters of the DECT Goodwin Borodino communication system radio interface are given in Table 2.

Table 2

Parameter Value
Frequency band 1880-1900 MHz
Peak power 250 mW ± 1 dB
Average force of transmitter radiation No more than 10 mW per channel



2.8. The intensity of failures in the Goodwin Borodino system


Table 3 shows the intensity of failures (Bit Error Rate — BER) in the radio channel of the Goodwin Borodino DECT communication system.

Table 3

Signal strength at input of the receiver BER
- 86 dB 10-5
- 92 dB 10-4



2.9. Reliability of the equipment of the Goodwin Borodino system
  • The average estimated time for operation of equipment without failure is not less than 15 years.
  • Average time to restore damage by changing faulty blocks — without taking into account time for localization of malfunction — does not exceed 30 minutes.
  • Longevity of the equipment — not less than 10 years.

2.10. Characteristics of the main equipment of the Goodwin Borodino system(Table 4).


Table 4


Power
Sources, V
Power
Consumption, W
The sizes
(L*W*H), mm
Weight,
kg
Base station controller (BSC-E1) -48…-72 100
Consumption, W
480*480*180 14.5
Base station controller (BSC-Upn) ~220 (50Hz) 25
Consumption, W
483*250*45 4.5
Base stations (BS-Upn) -48(-60) ± 20% 4
Consumption, W
140*108*32 0.155
Base station multiplexer (BSM-Upn) -48(-60) ± 20% 10
Consumption, W
320*240*25 0.7




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