Stewart shielded pcb communication jacks stewart ss7188s a nf shielded communication pcb jack socket 8 contacts 8 positions 1 port cat5 category copper alloy contact material gold contact plating thermoplastic housing material 150v ac voltage rating 15a current rating tin plated shield high levels of emi protection ul csa approved stewart ss7188s a nf 88 pcb jack shielded cat5