Cisco 10720 Configuration Guide - Page 65
Creating a DPT Ring Using Uplink Line Cards
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Chapter 3 Installing the Cisco 10720 Internet Router Creating a Four-Node DPT Ring 10720-SR-LC Figure 3-15 Node 4 PWRCAACXARSTRAPSIRVKPTIETEHRRU Creating a DPT Ring Using Uplink Line Cards Node 3 Node 2 10720-SR-LC 10720-SR-LC PWRCAACXARSTRAPSIRVKPTIETEHRRU PWRCAACXARSTRAPSIRVKPTIETEHRRU Node 1 PWRCAACXARSTRAPSIRVKPTIETEHRRU 10720-SR-LC TX A RX TX A RX Tx Tx Tx Tx TX A RX TX A RX Rx Rx Rx Rx 57876 TX B RX TX B RX TX B RX TX B RX Tx Tx Tx Tx Rx Rx Rx Rx Step 1 Install a DPT uplink card in a Cisco 10720 Internet Router on the network. Step 2 Choose a router with an uplink card to become Node 1 in the four-node DPT ring. Note The TX side B port on Node 1 goes to the RX side A port on the next router, which will become Node 2. The labels above the fiber connectors identify side A (left port) TX and RX, and side B (right port) TX and RX. (See Figure 3-15.) Step 3 Add other nodes to the ring by connecting the receive (RX) and transmit (TX) cables. The RX port on one uplink card must be connected to a TX port on the next uplink card. (See Figure 3-15.) Use Figure 3-15 and Table 3-1 to help organize the cable connections for a four-node DPT ring. Figure 3-16 provides a view of the network when a four-node DPT ring is created. 78-13062-10 Cisco 10720 Internet Router Installation and Configuration Guide 3-15