1. Case Study For Police
GSM SIM BOX –SERVER
GSM GATEWAY

2. Content Overview TOPEX SIM Server Architecture Architecture components
TOPEX SIM Server features
Alarms and statistics
Advantages
Redundancy mechanism
Power supply autonomy

3. Overview
Manages the SIM allocation without the need of human intervention by gathering the SIM cards in a central location
Virtual allocation of SIM cards – any SIM card stored in the SIM Box may be dynamically assigned to any GSM channel of any TOPEX gateway
SIM cards organized into logical groups named SIM Pools
Mobile modules organized into logical groups named GSM Pools
Remote recharging from the web based interface of the prepaid SIM cards
The administration and maintenance is achieved from the password protected web based interface
The information is exchanged via IP connection:
Necessary bandwidth 64kbps
Roundtrip delay between SIM Server/box and GSM GW should be bellow 800ms

4. TOPEX SIM Server architecture
LAN
2G/3G Networks
Remote OAM
4 GSM ch
2G/3G Networks
TOPEX SIM Server
IP Network
10 GSM ch
TOPEX SIM Box 10
TOPEX SIM Box 1
2G/3G Networks
30 GSM ch
Cellular Gateway

5. Architecture components
TOPEX SIM Server – a central device manager which administrate several SIM Boxes and GSM Gateways
One SIM Server can manage 10 SIM boxes – more than 5000 SIMs!
TOPEX SIM Box – storage device which contains up to 512 SIM cards on a single equipment
TOPEX VoiBridge – Cellular Gateway – up to 4 GSM / UMTS channels – available with FXO, BRI, PRI and VoIP trunks
TOPEX Qutex – Cellular Gateway – up to 20 GSM / UMTS channels – available with FXO, BRI, PRI and VoIP trunks
TOPEX multiAccess – Cellular Gateway – up to 64 GSM/UMTS channels
OAM PC – web based administration, operation and maintenance interface

6. TOPEX SIM Server features
Each SIM can have:
Maximum “talk-time” per day and Maximum “talk-time” per month
Why?
Avoid extra-usage of a SIM - improve network test reliability
Algorithms for choosing a SIM:
Talk time - the SIM with minimum talk time will be offered
Nr of calls - the SIM with the minimum number of calls will be offered
Last usage - the SIM which has the longest idle state
Credit - the SIM which the maximum credit value will be offered
To do load-balancing between the SIMs. One does not want to use some SIMs more and some less. They have to be used approximately equally – establish a constant use of SIM cards during tests
Generate SIM “travel” in GSM Gateways located in different places
SIMS can be allocated to modules in one gateway and then programmed to move to modules in another gateway
Why?
Multiple gateways can use minutes from the same SIM – test the availability of network to handle the SIM cards movement

7. Alarms and statistics Real time alarming system
Alarms sent through SMS or in case of:
malfunction SIM cards
failed connection between system components
low ASR and ACD
insufficient SIM cards in a SIM pool
Advanced statistics – report system on SIM, SIM Pool, GSM Pool, gateway, operator
CDR generation - text file with details such as: equipment name, card and port number, provider, IMSI code, number of calls or talk time

8. TOPEX VoiBridge VoIP to GSM / UMTS small capacity gateway
SIM Server ready – work with TOPEX SIM Server
Capacity
2 up to 4 channels VoIP to GSM gateway
2 up to 4 channels VoIP to UMTS gateway
1 SIM card per GSM channel
SIP and H.323 supported – any to any conversion
Mobile frequencies covered:
GSM: 850/900/1800/1900 MHz
UMTS: 850/1900/2100 MHz
Configurable alarms by , SMS or phone call in case of low ASR or hardware failures

9. TOPEX Qutex VoIP PRI GSM / UMTS medium capacity probe Capacity:
Up to 10 or 20 GSM/UMTS channels
5 plug-in boards with 2 or 4 GSM/UMTS channels per each board
Up to 4 SIM cards for each GSM / UMTS channel
SIM Server ready – can be used with TOPEX SIM Server
Frequencies covered:
GSM: 850/900/1800/1900 MHz
UMTS: 850/1900/2100 MHz
Configurable alarms by , SMS or phone call in case of low ASR or hardware failures

10. TOPEX multiAccess VoIP PRI GSM / UMTS large capacity probe Capacity:
Up to 32 or 64 GSM/UMTS channels
16 plug-in boards with 2 or 4 GSM/UMTS channels per each board
Up to 4 SIM cards for each GSM / UMTS channel
SIM Server ready – can be used with TOPEX SIM Server
Frequencies covered:
GSM: 850/900/1800/1900 MHz
UMTS: 850/1900/2100 MHz
Configurable alarms by , SMS or phone call in case of low ASR or hardware failures

11. Solution without SIM Server
Replace SIM
NOC IP
Traffic generator
through
GSM Network
GSM
Network
GSM
Network
TOPEX
VoiBridge
TOPEX
VoiBridge
SIM need
to be changed
SIM need
to be changed

12. SIM cards storage box – 512 SIM cards/box
Solution diagram
SIM server aplication
SIM cards storage box – 512 SIM cards/box
TOPEX SIM Box
Remote OAM
TOPEX SIM Server
Central Location
Branch 1
SIM
allocation IP
Network
IP PBX
Branch n
H323 or SIP
Branch 2
IP PBX
Mobile
Users
GSM
Network
IP PBX
TOPEX VoiBridge
H323 or SIP
H323 or SIP

13. Solution description
The solution includes several remote locations and a central location
In each remote location will be installed a TOPEX GSM Gateway equipment – between 4 and 32 channels GSM Gateway
The GSM Gateway will be connected to the company IP PBX through SIP or H.323 trunks
The calls to the GSM network from the sites will be routed through the GSM Gateway equipment in order to cut the costs of the calls from fixed to mobile
In the central location will be installed the SIM Server and the SIM Box equipments
All the SIM cards will be stored in the central location
The remote locations will not include SIM cards in the GSM Gateways
The allocation of SIM cards will be made remotely from the central location to all remote sites

14. How it works IP NOC TOPEX SIM Box TOPEX SIM Server SIM request SIM
allocation
SIM
request
SIM
allocation
Mobile
User
GSM
Network
GSM
Network
TOPEX VoiBridge
TOPEX VoiBridge

15. TOPEX SIM Server advantages
All SIM cards used are virtually stored and managed in a single central “SIM SERVER”
All SIM cards are physically stored in SIM Boxes located at client premises
The SIM server allocates the SIM cards remotely, via an IP connection - avoids expensive and time-consuming trips for on site SIM card replacement and recharging
The GSM modem has access to the remote SIM via a GSM terminal adapter/SIM emulator
Flexible SIM allocation, according to tariff plans of the mobile carriers (advanced LCR)
No need for human intervention to change SIMs manually
Different algorithms for SIM selection; flexible SIM timer settings (minute, hour, day)

16. Redundancy mechanism I
The SIM Server solution includes a central storage system – SIM Box equipment with SIM cards
The remote locations contains 4 channels GSM Gateways – TOPEX VoiBridge
The allocation of the SIMs is made remotely from the SIM Server application
The first redundancy mechanism consist in local SIM cards installed in the GSM Gateways – additional to the SIM cards located in the SIM Box
The communication between the SIM Box and the remote gateways contains a Keep Alive Mechanism on the TCP/IP connection
When the TCP/IP connection is broken the Keep Alive mechanism signals the malfunction between the gateways and the SIM Box
The remote gateways will automatically use the local SIM cards instead of SIM Box cards

17. Redundancy mechanism I diagram
Central Location
Central storage for SIM cards
TOPEX SIM Box
TOPEX SIM Server
Keep alive mechanism – no connection between the GW and the SIM Box IP
Network X
TCP/IP connection is down
VoiBridge will use only the local SIM cards
TOPEX VoiBridge
TOPEX VoiBridge
TOPEX VoiBridge

18. Redundancy mechanism II
The second redundancy mechanism implies the use of 2 or several SIM Box storage equipments which allows the distribution of SIM cards
Instead of using a single SIM Box for storage, the SIM cards are distributed in 2 or several boxes with an additional redundancy purpose
Each GSM module from the remote GSM Gateways will have assigned 2 SIM cards – one SIM card from SIM Box 1 and one SIM card from SIM Box 2
The SIM cards from the SIM Box 1 will have attached a higher priority than the SIM cards from SIM Box 2
When the SIM Box 1 is unavailable the GSM module can not use anymore the SIM card with higher priority. In this case the GSM module from the remote GSM Gateway will use the SIM card with a lower priority located in the second SIM Box

19. Redundancy mechanism II diagram
Central Location
High
Priority
SIM Server
Low
Priority
SIM Cards distribution
in SIM Box 1 and
SIM Box 2
SIM Box 1
malfunction
SIM Box 2
SIM Box 1
GSM module will use
the SIM card
with a lower priority
GSM module uses
the SIM card
with high priority IP
Network
TOPEX VoiBridge
TOPEX VoiBridge
TOPEX VoiBridge

20. Redundancy mechanism II diagram
Central Location
High
Priority
SIM Box 2
malfunction
SIM Server
Low
Priority
SIM Cards distribution
in SIM Box 1 and
SIM Box 2
SIM Box redundant
SIM Box 2
SIM Box 1
GSM module will use
the SIM card
with a lower priority
SIM Box 3
GSM module uses
the SIM card
with high priority IP
Network
TOPEX multiAccess
TOPEX VoiBridge
TOPEX VoiBridge
TOPEX VoiBridge

21. Redundancy mechanism III
The third redundancy mechanism includes the possibility to use empty SIM Box equipments with the same IP address with the operational one
When the operational SIM Box equipment fails or it is damaged, the client can use the other SIM Box equipments
The client need to extract manually the boards with SIM cards from the damaged SIM Box and to insert them in the new SIM Box
This mechanism will require some time for SIM cards movement but will resolve the problem which can appear in the case of a unusable central SIM storage box

22. Redundancy mechanism III diagram
Central Location
SIM Server
SIM Cards movement
from SIM Box 1
to SIM Box 2
SIM Box 1
malfunction
SIM Box 2
SIM Box 1 IP
Network
TOPEX VoiBridge
TOPEX VoiBridge
TOPEX VoiBridge

23. Power consume TOPEX Equipment Consumed power (Watts)
For power supply back-up autonomy for TOPEX equipments we recommend UPS systems
The consumed power for each equipment provided by TOPEX is detailed in the table below:
According to equipments installed in each location the UPS can be dimensioned in order to achieve the required capacity by the Turkish Police
TOPEX Equipment
Consumed power (Watts)
SIM Server (HP Proliant PC Server)
250
SIM Box – 512 SIM cards 60
VoiBridge – 4 GSM channels 40
Qutex – 10 GSM channels
multiAccess – 30 GSM channels 90

24. UPS autonomy
For instance if the central location 1 SIM Server unit, 1 SIM Box unit and 1 multiAccess the consumed power is about 400 W ( ) which means around 560 VA
By using an UPS system with 2200 VA (2,2 KVA) the autonomy for the equipments installed in the central location will be around 1.5 hours. In case of using a larger capacity UPS, for instance 5KVA the power supply autonomy will increase to 3 hours.
The central location where the SIM Box and SIM Server will be installed has the highest power consume. For the other sites which includes 1 VoiBridge, Qutex or multiAccess the power supply autonomy is detailed below:
Equipment name
VoiBridge
Qutex
multiAccess
Consumed power
40 W
60 W
90 W
Autonomy for 1 KVA UPS 3h
1h 40m
Autonomy for 3 KVA UPS
8h 50m 8h
5h 30m

25. Contact Birtel Network Technologies www.birtel.com.tr
Tel
Fax
Address Abidin Daver Sk.  No:7/11  
Çankaya - Ankara
Türkiye
Birtel Network Technologies