48-Port 8P2C female Telco 2 rack mount space (RMS) patch panels with a 2-Wire RJ-45 USOC wiring scheme are ideal for KSU or PBX phone systems. The active pins are pin #4 and #5, the patch panel connects to 48 ports RJ-45 patch cords on the front and link the phone system with 50-Pin Telco connectors on the back. Each 50-Pin female Telco connector comes with a hook and loop tie that is seated in a socket to secure 25-Pair cable for either 90 degrees or 180 degrees cable exits. Each patch panel also features a front write-on labeling area for port identification.