32 Installation Guide (AA-RSTZF-TE, November 2005)

Introduction to the Edge Switch 2/3220

• Loopback plug—An SFP multi-mode (short-wave laser) or single-mode (long-wave laser)

loopback plug, shown in Figure 3, is required to perform port loopback diagnostic tests. One

loopback plug is shipped with the Edge Switch, depending on the type of port transceivers

installed. Both plugs are shipped if short-wave laser and long-wave laser transceivers are

installed.

Figure 3 Loopback plug

• Fiber-optic protective plug—For safety and port transceiver protection, fiber-optic protective

plugs, shown in Figure 4, must be inserted in all Edge Switch ports without fiber-optic cables

attached. The Edge Switch is shipped with protective plugs installed in all ports.

Figure 4 Fiber-optic protective plug

• Null modem cable—An asynchronous RS-232 null modem cable, shown in Figure 5, is required

to configure Edge Switch network addresses and acquire event log information through the

maintenance port. The cable has nine conductors and DB-9 male and female connectors.

Figure 5 Null modem cable