» 1980
· PCI was established by a trio of young engineers.

» 1981-88
· PCI designed and manufactured its first line of PABX products.
· PCI solidified its brand CARIN.

» 1989
· PCI introduced CARIN-500 PABX.

» 1990
· PCI started its manufacturing plant of 6’000 square meters in the eastern industrial zone of Tehran.

» 1991
· PCI renovated its whole PABX product lines to use SPC.

» 1992
· PCI introduced its new public telephone exchanges with CARIN-2000.

» 1993-94
· PCI integrated 150 units of CARIN-2000 in telecommunication network.

» 1995
· PCI introduced its high capacity public exchange CARIN-LX1.
· PCI integrated 300’000 ports of digital exchanges in the telecommunication network.

» 1996
· PCI integrated 400’000 ports of digital exchanges in the telecommunication network.

» 1997
· PCI introduced its medium capacity public exchange CARIN-MX1.

» 1998-99
· PCI introduces its new product lines including switching test products, access network products, pair-gain products, transmission products.

» 2000-Present
· Increased its domestic market share up to 4’300’000 ports.
· Expanded into international markets.
· Expanded into telecommunication services market.