Cisco 3825 Hardware Installation Guide - Page 100
Configuring Balanced Mode
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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 Step 6 Step 7 Step 8 Step 9 24062 Figure 4-17 Jumpers in Unbalanced 75-Ohm Position (Top Card) TERMINATION 120 75 J9 J8 J7 J6 J5 J4 CABLE SHIELD Align the network module with the guides in the chassis and slide it gently into the slot. Push the module into place until you feel its edge connector mate securely with the connector on the motherboard. Fasten the module captive mounting screws into the holes in the chassis, using the Phillips or flat-blade screwdriver. If the router was previously running, reinstall the network interface cables and turn on power to the router. The following warning applies to routers that use a DC power supply: Warning After wiring the DC power supply, remove the tape from the circuit breaker switch handle and reinstate power by moving the handle of the circuit breaker to the ON position. Statement 8 Configuring Balanced Mode To configure the network module for balanced 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 120-ohm position. Set jumpers J4 through J8 on the bottom terminal block to the same 120-ohm position. (See Figure 4-16.) 4-10 Cisco Network Modules Hardware Installation Guide OL-2485-20