 Ability to connect Up to 256 VPN(ViPLCal Private Network) 

o Port routing 

o DoS (Denial of Service) 

o Firewall input for more than one user (maximum 32) 

 Time protocols which can be used for synchronizing network time by using SNTP or NTP 

  Firewall failure diagnosis capacity 

o Firewall list – MAC and IP address 

## 8.21 Hardware requirements 

## 8.21.1 General 

o Ports, Usage, Statistics and ARPS 

o Finding topology 

o Device status 

o Alarms(traps) 

o Reports – System information 

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 between failures (MTBF) for the system as a whole shall be better than 1000 hours. 

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. 

Accessibility is defined as MTBF/(MTBF+MTTR). 

Accessibility for individual components shall as a minimum be as follows: 

 'sPLC 0.995 

 I/O's 0.99 

 PC 0.985 

 Printers 0.98 

 Network 0.995 

## 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 

