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Forum Discussion
superuser2510
Apr 21, 2026Aspirant
RS700s reducing speed to 90mbps.
So I have the BGW320 in IP passthrough mode and connected the blue 5GB port from the BGW320 to the WAN port on my RS700s. Intially I had connected the two with a 6ft cat5e cable and was getting a dow...
superuser2510
Apr 21, 2026Aspirant
Its shows 100M/Full
CrimpOn
Apr 21, 2026Guru - Experienced User
superuser2510 wrote:Its shows 100M/Full
Ethernet ports perform autonegotiation when connected. https://en.wikipedia.org/wiki/Autonegotiation
This is built into the physical hardware. If the WAN port has decided that the highest speed the link will support is 100M/Full, then because of the overhead that is part of Ethernet, the actual speed measurement will be lower than 100. Also, anything connected to the RS700 router (no matter what type of cable) cannot possibly measure a higher speed because the WAN link is limited to 100M/Full.
This is the problem. It could be an issue with the actual cable, with one of the RJ45 connectors, or with the RJ45 port on the router or the BGW320.
- CrimpOnApr 21, 2026Guru - Experienced User
p.s. Internet search will provide ample references that Cat 5e cable supports gigabit Ethernet up to 100 meters (over 300 ft.) A 35 ft. Cat 5e cable is more than enough --- as long as there is nothing wrong with the entire link.
I once had a colleague insist that "anyone who doesn't buy a Mercedez is crazy! It is the only car worth buying." Sure.
In today's market, the price difference between Cat5e and Cat6 (or even Cat7) Ethernet cables is tiny. I certainly do not purchase Cat5e cables any more.