Hello,
I would like to connect two parts of my house with two switches using a fiber cable. They are 60 meters away and I could not pass a copper cable into the wall since the tubes are too small.
At one side I have an old 3com 2924-SFP switch, and at the other side I have a brand new QNAP QSW-M2108-2S switch. The former one accept 1 Gbit/s SFP, the latter accept both 1 and 10 Gbit/s SFP(+) connector. A cable guy passed an 80 meters cable, then cutted it down and joined the parts in order to have a 60m cable. He did not tested the cable one joined.
Now, when I connect the switches, the 3com does not get an IP address from the DHCP server connected to the QNAP. I think the connection is not working at all, but the diagnostic logs are very very limited.
I have tried two different SFP on the 3com: the original 3CSFP91 from 3com (1000Base-SX, LC MMF, 850 nm, 275m) and a generic SFP1G-SX-85 (1000BASE-SX, 850nm, DOM, LC MMF, 550m) from fs.com. On the QNAP I only use the generic one.
When I plug the SFP on the 3com, I see this message: "%Box-I-SFP-PRESENT-CHNG: unit_id 1 SFP 0 status is present".
When I plug the cable on the SFP on the 3com, I see: "%2SWPHY-I-CHNGCOMBOMEDIA: Media changed from copper media to fiber media (Unknown) on port 21".
I tried both SFP connectors on all 4 SFP ports, having always these messages. Of course, when I plug the SFP in, I see the 3com led switched on, but the port is shown as emplty form the 3com web interface.
On the other side, on the QNAP, there is no available log, but the QSS web interface shows that the port is green when the SFP is connected. It also says: Link is up, 1 Gbps FDX.
How may I better understand what is wrong? Why the connections does not work?
Thank you,
Giuseppe
I would like to connect two parts of my house with two switches using a fiber cable. They are 60 meters away and I could not pass a copper cable into the wall since the tubes are too small.
At one side I have an old 3com 2924-SFP switch, and at the other side I have a brand new QNAP QSW-M2108-2S switch. The former one accept 1 Gbit/s SFP, the latter accept both 1 and 10 Gbit/s SFP(+) connector. A cable guy passed an 80 meters cable, then cutted it down and joined the parts in order to have a 60m cable. He did not tested the cable one joined.
Now, when I connect the switches, the 3com does not get an IP address from the DHCP server connected to the QNAP. I think the connection is not working at all, but the diagnostic logs are very very limited.
I have tried two different SFP on the 3com: the original 3CSFP91 from 3com (1000Base-SX, LC MMF, 850 nm, 275m) and a generic SFP1G-SX-85 (1000BASE-SX, 850nm, DOM, LC MMF, 550m) from fs.com. On the QNAP I only use the generic one.
When I plug the SFP on the 3com, I see this message: "%Box-I-SFP-PRESENT-CHNG: unit_id 1 SFP 0 status is present".
When I plug the cable on the SFP on the 3com, I see: "%2SWPHY-I-CHNGCOMBOMEDIA: Media changed from copper media to fiber media (Unknown) on port 21".
I tried both SFP connectors on all 4 SFP ports, having always these messages. Of course, when I plug the SFP in, I see the 3com led switched on, but the port is shown as emplty form the 3com web interface.
On the other side, on the QNAP, there is no available log, but the QSS web interface shows that the port is green when the SFP is connected. It also says: Link is up, 1 Gbps FDX.
How may I better understand what is wrong? Why the connections does not work?
Thank you,
Giuseppe