Product information:

V.35 Surge Protector (All 34 Lines) M/34 (Male to Female)

The Model 546 surge protector guards V.35 data ports against damage and data loss due to transient surges. It intercepts
harmful surges and diverts them x to chassis ground through a braided metal strap. All standard data, clocking and control signals on the CCITT V.35 interface are protected (although the Model 546 is also available with all 34 pins protected).