GLC-SX-MMD-BCC | Cisco Compatible 1GB Multi-Mode 550m (1000BASE-SX)

Q: Will this work in place of the Cisco GLC-SX-MMD?
A: Yes. The GLC-SX-MMD-BCC is designed as a drop-in replacement for the Cisco GLC-SX-MMD. It meets the same IEEE 802.3z 1000BASE-SX standard, uses the same SFP form factor, operates at the same 850nm wavelength, and provides identical 1.25 Gbps data rate and reach specifications. It is plug-and-play compatible with Cisco Gigabit Ethernet ports.

Q: Which Cisco platforms support this transceiver?
A: This transceiver works in any Cisco device with a Gigabit Ethernet SFP slot that supports 1000BASE-SX optics. The requirement is an SFP port capable of 1GbE operation with multimode fibre support. If your platform accepts the original Cisco GLC-SX-MMD, it will accept this module.

Q: What fibre types and reach can I expect with this module?
A: This 850nm transceiver operates over multimode fibre only. Reach is 220m on 62.5um OM1 fibre, 550m on 50um OM2 fibre, and extends further on OM3 and OM4 laser-optimised fibre. Actual reach depends on the modal bandwidth of your installed fibre plant and total link loss budget.

Q: How do I access the DOM diagnostic data?
A: DOM data is accessible through your switch or router CLI using standard show interface transceiver commands. The module reports optical transmit power, optical receive power, operating temperature, laser bias current, and supply voltage in real time. Alarm and warning thresholds are factory-programmed per SFF-8472 MSA, enabling automated fault detection.

Q: Can I mix this transceiver with other vendors' 1000BASE-SX modules on the same link?
A: Yes. Because this module is IEEE 802.3z compliant, it will interoperate with any other standards-compliant 1000BASE-SX transceiver regardless of vendor. The 850nm wavelength, duplex LC connector, and 1.25 Gbps signaling rate are defined by the standard and ensure compatibility across mixed-vendor environments.