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Solved
GS305v3 switch - Intermittently disconnects the connection, and slow speed.
Hi to all, I bought the GS305v3 Gigabit unmanaged switch in order to replace my 100Mbps fast ethernet 3com switch. I have install it on the same network but I have two different problems. I have a Ci...
Mike_test wrote:1. I run the jperf speed test and I get speeds of 95Mbps so it seems that the cable can't tolerate higher speeds, but a dont understand the disconnections. If I get back to my 100Mbps switch I have no disconnections.
This stinks (sorry my simple words). Gigabit Ethernet does work on a much higher frequencies than Fast Ethernet, and at about the double bandwidth. Assuming you talk of a jperf test between the two computers (one on the Cisco router LAN, on on the Netgear switch) and the traffic does travel this poor link. Clearly a cabling issue - not compatible for Gigbit Ethernet.
Mike_test wrote:2. I have connected 2 Pc's with Gigabit ethernet cards alone with cat6 cable and I copy a 3Gb file from 1 pc to the other. The copy go up to 113Mb transfer but after around 1/3 of the file the copy speed drops to 20Mb.
This can have different causes. The link issue described above can have a big impact, potentially repeated re-negotiation or at least massive errors on the GbE link. Another point is that computers can and will do some read- and write-caching from the mass storage - form a certain point (as there is typically no full SSD cache) the data is read and written from/to the effective storage media.
Mike_test wrote:1. I run the jperf speed test and I get speeds of 95Mbps so it seems that the cable can't tolerate higher speeds, but a dont understand the disconnections. If I get back to my 100Mbps switch I have no disconnections.
This stinks (sorry my simple words). Gigabit Ethernet does work on a much higher frequencies than Fast Ethernet, and at about the double bandwidth. Assuming you talk of a jperf test between the two computers (one on the Cisco router LAN, on on the Netgear switch) and the traffic does travel this poor link. Clearly a cabling issue - not compatible for Gigbit Ethernet.
Mike_test wrote:2. I have connected 2 Pc's with Gigabit ethernet cards alone with cat6 cable and I copy a 3Gb file from 1 pc to the other. The copy go up to 113Mb transfer but after around 1/3 of the file the copy speed drops to 20Mb.
This can have different causes. The link issue described above can have a big impact, potentially repeated re-negotiation or at least massive errors on the GbE link. Another point is that computers can and will do some read- and write-caching from the mass storage - form a certain point (as there is typically no full SSD cache) the data is read and written from/to the effective storage media.
Solved!!! So I setup an ideal connection both Pc's on short Cat6 to switch and short Cat6 from switch to router. "Pc1 and Pc2->2m Cat6->Netgear switch->2m Cat6->Router". Jperf was perfect but copy was not. Still droping after a while to 20MBs. I transferred the shared folder from HDD to SSD and it was flying. Solid 112MBytes so yes HDD cash does matter and alot.
Then I check again all cables and there was 1 cable wall to router that was only cat5. I realised the although the colour was same as the 25m cat5e it was not "e". Yeas almost identical only e was missing. I change it and bam!!! Jperf through 25m Cat5e was giving me solid 111MBytes and could copy the 3GB file with the same speed.
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