54 CHAPTER 7: SWITCH FABRIC M ANAGEMENT MODULES AND I NTERFACE M ODULESGBICGigabit EthernetModules Model Number: 3C16826 (1 port), 3C16843 (2 ports) Size — Occupies one slot in the Switch 4005 chassis Functionality — Layer 2 and Layer 3 switching Physical features: Diagnostic LED shows module status. Release button and LED are used to remove the module. GBIC ports with a GBIC transceiver installed (not included with module)provide a 1000 Mbps connection. GBIC transceivers provideautonegotiation for duplex mode and flow control. A GBIC port can accept a 1000BASE-LX (single-mode fiber) transceiver or70-km long haul (single-mode fiber) transceiver. The GBIC module shouldonly be used with the transceivers approved by 3Com. See the “GBICTransceivers” section later in this chapter. Module and Port LEDs — See Table 13 on page 56 for definitions. Front faceplate — See Figure 20 on page 55 for details. Use either of the following transceivers: Cabling requirements: The type of fiber optic cabling that you use depends on the GBIC transceiverthat you select and the transmission range that you need. See the section“GBIC Transceivers” on page 63 for more information.GBIC Transceiver Maximum Transceiver Range 3Com Model Number1000BASE-LX 10,000 m (32,810 ft) 3CGBIC92Long Haul 70 km (43.4 mi) 3CGBIC97