Publication date: Feb., 2012Revision A121Step2. If the device is a network card and the switch is in the wiring closet, attachthe other end of the cable segment to a modular wall outlet that isconnected to the wiring closet. (See the section “Network WiringConnections.”) Otherwise, attach the other end to an available port on theswitch.Make sure each twisted pair cable does not exceed 100 meters (328 ft) in length.NOTE: Avoid using flow control on a port connected to a hubunless it is actually required to solve a problem. Otherwise backpressure jamming signals may degrade overall performance forthe segment attached to the hub.Step3. As each connection is made, the Link LED (on the switch) corresponding toeach port will light green (1000 Mbps) or Yellow (100 Mbps) to indicatethat the connection is valid.NETWORK WIRING CONNECTIONSToday, the punch-down block is an integral part of many of the newer equipmentracks. It is actually part of the patch panel. Instructions for making connections inthe wiring closet with this type of equipment follows.Step1. Attach one end of a patch cable to an available port on the switch, and theother end to the patch panel.Step2. If not already in place, attach one end of a cable segment to the back of thepatch panel where the punch-down block is located, and the other end toa modular wall outlet.Step3. Label the cables to simplify future troubleshooting. See “Cable Labelingand Connection Records” on page 29.Figure 17: Network Wiring ConnectionsSwitchEquipment Rack(side view)Patch PanelPatch-Down BlockWall