SMART CARDS USED IN THE PREPAYMENT SYSTEM

1) Authority Card ( Used by the authorities )
a- Cancel Card
b- Open Card
c- Return Card
d- Control Card

2) Subscriber Cards

Electronic Smart Card

1) AUTHORITY CARDS
A) CANCEL CARD : Used when authority decide to close a meter for any reason. In this case subscriber can not
use energy or water. In order to activate meter, authority must use Open Card.
B) OPEN CARD: On the cases that meter is closed with “Penalty”, “Service” messages, this card is used to
activate the meter. After that subscriber may use water.
C) RETURN CARD: If the subscriber request the purchased credit amount on the smart card or meter back , this card is used.
D) CONTROL CARD: Used by authorities to control all units of the meter periodically. Control card, record all
information of meter ( battery level, valve problems etc.) and these information is sent to the service
management.

2) SUBSCRIBER CARDS
• SUBSCRIBER CARD: The card used by the subscriber to purchace credit and have the purchased credit loaded to their meters. Meter number and smart card numbers are matched. Main and backup credit information is transfered by smart card. Smart Cards are fully compatible with ISO 7816-3 standard security protocols.

INFORMATIONS TRANSFERRED FROM METER TO THE CENTER

• Subscriber number                      
• Subscriber type                          
• Meter number                          
• Meter type                             
• Main credit on the card                   
• Backup credit on the card                 
• Remaining credit on the meter             
• Used credit on the meter                  
• Battery level                            
• Last credit load date to the meter           
• Last waterconsumption date  
• Penalty date                           
• Malfunction date                         
• Meter status                             
• Valve operation number               

STRUCTURE OF COMPUTER SYSTEM

• In the structure Tengyue prepayment smart card operated systems there are two main servers. One of
them is the master and the other is bridge or backup server. System uses SQL database on NT system.

• In the system main servers on the authority center are always online connected to the Credit Sales Points
(POS).

• Computers in the system are as follows:
1 - Two servers at the authority center
2 - Computers at the Credit Sales Centers
3 - Computers at the Credit Sales Points (POS)

• Main computer is named as “server”. All information is stored at main computer and credit sales points and
centers are controled by the servers.
• Second computer at the authority center supports the main computer. All sales information is stored in the
second computer. These information is transfered to the main computer. Second computer operates as a
bridge between main computer and sales points and centers. To provide data flow, second computer has
Digiboard multiplexer and other special softwares.
• Connection between second computer and terminals are performed by modems that terminals have.
• All sales terminals have card reader and smart card credit loading unit. Credit loading, credit returning,
adding new subscription, subscriber follow-up operaitons are done by these units. Authority is informed about
all the operations.