Cisco WS-X401310GE-RF Hardware Maintenance Manual - Page 49

Network Connection Considerations Figure 2-27 Dual-Attachment Multimode FDDI Module-End View LEDs (2) PHY-B Multimode ports PHY-A PHY-B PHY-A PHY-B RING OP FDDI OPT-BYPASS PHY-A RING OP Optical bypass switch connector H1400a Alignment groove Mounting screw locations Alignment groove The standard connection scheme for a dual-attachment station dictates that the primary ring signal enters the router on the PHY-A RCVR port and returns to the primary ring from the PHY-B XMTR port. (See Figure 2-28.) The secondary ring signal comes into the router on the PHY-B RCVR port and returns to the primary ring from the PHY-A XMTR port. Failure to observe this relationship in making your network connections will prevent the FDDI interface from initializing. The single-attachment module's PHY-S port can be connected through a concentrator to a single-attachment ring, or can be connected point-to-point directly to another device. Figure 2-28 Dual-Attachment FDDI Optical Bypass Switch and PHY Connections Optical bypass switch Optical bypass interface cable Dual-attachment multimode FDDI module To ring PHY-A PHY-B PHY-A RING OP FDDI OPT-BYPASS RING OP H1405a Bypass operation PHY-B PHY-B PHY-A Mounting screw locations Optical bypass switch connector (DIN) The single-attachment module's PHY-S port (as shown in Figure 2-29) can be connected through a concentrator to a single-attachment ring or directly to another device. Preparing for Installation 2-27