Cisco 3825 Hardware Installation Guide - Page 99

Chapter 4 Connecting Fast Ethernet-PRI Network Modules 1-Port Fast Ethernet and 1- or 2-Port Channelized E1/ISDN PRI Balanced or Unbalanced Network Modules Configuring Unbalanced Mode To configure the network module for unbalanced mode, follow these steps: Step 1 Turn off electrical power to the router. However, to channel ESD voltages to ground, do not unplug the power cable. Remove all network interface cables, including telephone cables, from the rear panel. The following warning applies to routers that use a DC power supply: Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position. Statement 7 Step 2 Step 3 Step 4 Step 5 Loosen the module captive mounting screws, using a Phillips or flat-blade screwdriver. Hold the captive screws between two fingers, and pull the network module toward you until it slides free of the chassis. Set the network module on an ESD-preventive mat. Using needlenose pliers, set jumpers J5 through J9 on the top terminal block to the 75-ohm position. Set jumpers J4 through J8 on the bottom terminal block to the same 75-ohm position. (See Figure 4-16.) Figure 4-16 Jumper Insertion CABLE SHIELD J9 J8 J7 J6 J5 J4 75TERMI12N0ATION CABLE SHIELD J9 J8 J7 J6 J5 J4 75TERMI12N0ATION Top card Bottom card Place jumper in this position last Place jumper in this position first 24064 Figure 4-17 shows the top terminal block set to unbalanced (75-ohm) position. OL-2485-20 Cisco Network Modules Hardware Installation Guide 4-9