Stewart unshielded communication jack sockets stewart ss5644 nf vertical unshielded communication jack 4 contacts 4 positions 1 port socket gender phosphor bronze contact material gold contact plating glass filled thermoplastic housing material 150v ac voltage rating 15a current rating 20 to 85c operating temperature ul csa approved for communication and networking applications stewart ss5644 nf 44 vert pcb jack unshielded