64 Installation Guide (AA-RSNGD-TE, July 2004)

Overview

32 Director 2/64 Installation Guide

■ Loopback plug—An SFP multi-mode (shortwave laser) or single-mode

(longwave laser) loopback plug, as shown in Figure 5, is required to perform

port loopback diagnostic tests. One loopback plug is shipped with the director,

depending on the type of port transceivers installed. Both plugs are shipped if

shortwave laser and longwave laser transceivers are installed.

Figure 5: Loopback plug

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

fiber-optic protective plugs, as shown in Figure 6, must be inserted in all

director ports without fiber-optic cables attached. The director is shipped with

protective plugs installed in all ports.

Figure 6: Fiber-Optic protective plug

■ Null modem cable—An asynchronous RS-232 null modem cable, as shown

in Figure 7, is required to configure director network addresses and acquire

event log information through the maintenance port. The cable has nine

conductors and DB-9 male and female connectors.