Connecting to the Network2E48-27R/2E49-27R User’s Guide3-93.4.1 Connecting Fiber Optic Cables to Ports 1Through 24Each fiber optic link consists of two strands of fiber optic cabling: thetransmit (TX) and the receive (RX). The transmit strand from a2E4X-27R port connects to the receive port of a fiber optic Ethernetdevice at the other end of the segment. The receive strand of theapplicable port on the 2E4X-27R connects to the transmit port of the fiberoptic Ethernet device.Cabletron Systems recommends labeling fiber optic cables to indicatereceive and transmit ends. Many cables are prelabeled, providingmatching labels or tapes at both ends of each strand of cable.The following instructions detail the process used to connect an STconnector to a 2E4X-27R port.1. Remove the protective plastic covers from the fiber optic ports on theapplicable port on the module, and from the ends of the connectors oneach fiber strand.2. Refer to Figure 3-6 and attach one fiber to the applicable receive (RX)port on the 2E4X-27R. Insert the ST connector into the port with thealignment slot on the connector inserted over the locking key on theport. Turn the connector clockwise to lock it in place.3. Attach the other fiber of the pair to the applicable transmit (TX) porton the 2E4X-27R using the same procedure to insert the ST connector.NOTELeave the protective rubber covers in place when theconnectors are not in use to prevent contamination.!CAUTIONDo not touch the ends of the fiber optic strands, and do not letthe ends come in contact with dust, dirt, or other contaminants.Contamination of cable ends causes problems in datatransmissions. If the ends of the fiber optic strands becomecontaminated, use a canned duster to blow the surfaces clean.A fiber port cleaning swab saturated with optical-gradeisopropyl alcohol may also be used to clean the ends.
