The TE Connectivity 5520258-2 is a vertical through-hole modular jack, configured as 6p4c (RJ11/RJ14). The housing is polybutylene terephthalate (PBT) / polyester, and the part includes board lock features and panel stops for secure mounting. Rated Cat3, it is suited for analog telephone, ISDN, and 10BASE-T Ethernet, but not for Cat5e or higher data rates.
The 6p4c contact arrangement means the jack accepts standard 6-position RJ11/RJ14 plugs; the centre 4 contacts are wired, leaving the outer two positions unused. The Cat3 rating limits the usable bandwidth to 16 MHz — fine for voice and 10BASE-T, but a Cat5e or Cat6 cable plant will be bottlenecked by this jack. The vertical orientation and through-hole termination keep the jack rigid on the board; the board lock and panel stops prevent the jack from lifting during plug insertion and extraction.