Access Control 23
Access Control 23 : Physical security: (6) Access control system topologies: Access control System Using Serial Controllers: (6) IP Controllers: Advantages: (a) An existing network infrastructure is fully utilized, there is no need to install new communication lines. (b) There are no limitations regarding the number of controllers (32 per line in case of RS-485). (c) Special RS-485 installation, termination, grounding and troubleshooting knowledge is not required. (d) Communication with controllers may be done at the full network speed, which is important if transferring a lot of data (databases with thousands of users, possibly including biometric records). (e) In case of an alarm controllers may initiate connection to the host PC. This ability is important in large systems because it allows to reduce network traffic caused by unnecessary polling. (f) Simplifies installation of systems consisting of multiple sites separated by large distances. Basic Internet link is sufficient to establish connections to remote locations. (g) Wide selection of standard network equipment is available to provide connectivity in different situations (fiber, wireless, VPN, dual path, PoE)
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