COMBI-BOOSTER© Nedap IDEAS, P.O. Box 103, NL-7140 AC GROENLO Page 6 of 114 CUSTOMER CODESThe customer code is an invisible number inside the transponder, which is unique for each customer. Alltransponders for any particular customer will contain the same customer code. This ensures thattransponders belonging to Customer A will not be read by any other TRANSIT reader owned byCustomer B.Each combi-booster is programmed with the customer code and a unique id number. The same appliesfor the low frequency card as well. The combi-booster does not verify the customer code of the insertedcard, but will forward it to the TRANSIT reader. The TRANSIT reader verifies for both id numbers if thecustomer code matches the customer code programmed to that reader. If the customer code for either idnumber is invalid, then that id number is ignored. If the customer codes for both vehicle-id and driver-idare invalid, the TRANSIT reader will ignore all transmitted data.Customer codes are never transmitted to a host system.5 FACILITY CODESFacility codes used by some card manufacturers, such as HID, are very similar to customer codes.A facility code, which is sometimes called a site code, also differentiates one user’s card group fromanother. The facility code is programmed into the card at the time of manufacture.The facility code is sent to the host system.Nedap cards do not contain a facility code.