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3Com Super Stack 3 Switch 4400 Cascade Extender Module 3C17226 + 3C17225 Cable.

3Com Super Stck 3 Switch 4400 1000BASE-LX Module 3C17223

Cisco 1000BASE-LH Transceiver Cisco 30-1299-01 Cisco GLC-LH-SM Cisco 1000Base-LX

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3Com Super Stack 3 Switch 4400 1000BASE-SX Module 3C17221

3Com Super Stack 3 Switch 4400 Cascade Extender Module 3C17226 + 2 3C17225 Cable