3com Ss3 Switch 4400 1000base

Hi, I have for sale 6 units of this 3Com 3C17221 Single Port Fiber Gigabit Ethernet Connection.
Scale the performance of your Ethernet/Fast Ethernet network by adding this module to the 3Com SuperStack 3 Switch 4400 or Switch 4400 SE 10/100 managed switch. This module provides a resilient, short-haul, high-performance inter-workgroup or workgroup-to-backbone Gigabit Ethernet connection
Specifications

3C17221 Data Sheet
3Com 3C17221 Getting Started Guide
Benefits:
Provides a short-haul fiber interface
Support for 802.3z full-duplex Gigabit Ethernet delivers up to 2 Gbps throughput
Provides a resilient link backbone to improve overall fault-tolerance
Inserts easily into the expansion slot at the back of the Switch 4400 or Switch 4400 SE
Standards-based 802.1p, 802.1Q, and multicast filtering support multimedia applications

The price is for one unit. 6 units available. Thank you.