94 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 8: Electrical Works  o DoS (Denial of Service)  o Port routing  o Firewall input for more than one user (maximum 32)   Ability to connect Up to 256 VPN(ViPLCal Private Network)  Time protocols which can be used for synchronizing network time by using SNTP or NTP    Firewall failure diagnosis capacity  o Ports, Usage, Statistics and ARPS  o Finding topology  o Device status  o Alarms(traps)  o Reports – System information  o Firewall list – MAC and IP address  8.21 Hardware requirements 8.21.1 General  All equipment shall be standard factory manufactured components existing in at least 1000 units.  The CMS shall be prepared for an extension of the number of parameters (input/output signals, timers,  counters, set points, measurements, calculations etc.) with a minimum of 20%.  Mean time to repair (MTTR) for the system as a whole shall not be more than 8 hour including time  for transport of the staff to the site, provision of spare parts and including time for locating of the fault. Mean time between failures (MTBF) for the system as a whole shall be better than 1000 hours.  Accessibility is defined as MTBF/(MTBF+MTTR).  Accessibility for individual components shall as a minimum be as follows:  8.21.2 Monitoring station  The computer shall be of the Personal Computer type, well-reputed make and in the firm's professional  series (rack server type)  Scada server computers will be rack type and clients will be all in one type workstation. Hardware will  be state of art or will have minimum following properties. If it has updated version as of date  implementing work it can be used such that it wil not have less than following properties. Rack cabinet will have 19” 42U type 800x2098x1000 mm dimensions  8_Vol3_d4.3_Section 8 electrical works_en_GIR.rev8.doc   Network 0.995   Printers 0.98   PC 0.985   I/O's 0.99   'sPLC 0.995 