Cisco WS-C4003-RF Hardware Maintenance Manual - Page 90

Reading Network Processor Module LED Indicators Figure 4-11 Dual-Attachment Multimode FDDI Module-End View LEDs (2) PHY-B Multimode ports PHY-A Alignment groove PHY-B PHY-A PHY-B RING OP FDDI OPT-BYPASS PHY-A RING OP Optical bypass switch connector H1400a Mounting screw locations Alignment groove Figure 4-12 Single-Attachment Multimode FDDI Module-End View LED PHY-S Multimode port Alignment groove PHY-S FDDI OPT-BYPASS PHY-S RING OPT Optical bypass switch connector H1401a Mounting screw locations Alignment groove When lit, a module LED indicates a ring up condition. Dual-attachment FDDI module LEDs indicate which PHY on the network processor module is inserted into the ring; if a PHY is not actively inserted into the ring, the LED is not lit. On a single-attachment module, the LED indicates ring up when lit; when the LED is not lit, it indicates that the module is not inserted into a ring. 4-10 Cisco 4000 Series Hardware Installation and Maintenance