Panasonic PBX Series

Panasonic, although still early in the PBX industry (compared to other manufacturers), does have a complete PBX models line-up.

Year : Series
1980's : KX-T (analogue)
1990's : KX-TA and KX-TD (analogue)
2000's : KX-TEA, KX-TES and KX-TEM (analogue)
2004 : KX-TDA (hybrid)
2007 : KX-TDE (IP)
2009 : KX-NCP (IP)

Panasonic had been rather successful with its analogue PBX. You will notice that Panasonic only embraces hybrid / IP technology in the recent years.

NEC PBX Series

Unlike other PBX manufacturers, NEC started in the communications line. Therefore, NEC series of PBX models is long. This article is going to list those more recent PBX models, starting from the 90's.

Year : Series
1980's and 1990's : NEAX (analogue)
2002 : NEAX IPS and IPX (hybrid)
2004 : Elite IPK (hybrid)
2006 : Elite IPK II (hybrid)
2006 : Aspila TOPAZ / XEN Topaz / XN120 (hybrid)
2007 : Aspila/Aspire EX (hybrid)
2008 : DS and DSX (IP)
2009 : UNIVERGE (IP)

In the timeline above, you will also notice that the PBX models changed from circuit-switched (analogue) to hybrid to IP-switched architecture.