It is a well-known issue for two devices with Gigabit Ethernet ports, when connected through a 2-pair cable (or a non-gigabit PoE injector in between) sometimes works properly (downgrades speed to 100Mbps) and sometimes not (auto-negotiates gigabit which then doesn't link because it requires 4 pairs, while auto-negotiation itself works over 2 pairs).
I'm seeing mixed results between different combinations of MT devices, for example:
- CRS328-24P-4S+ to wAP 60G AP - working (takes a few seconds longer than usual, but finally link is negotiated and up at 100Mbps-Full)
- CSS610-1Gi-7R-2S+OUT to L41G-2axD - NOT working (no link even after a long wait, link works only after setting to forced 100Mbps-Half)
Would it be possible for MT to handle this case properly in ALL devices with gigabit ethernet ports, or are some of them limited by hardware (switch chip features) that make this difficult? Basically, if there is no link for a long time, periodically retry auto-negotiation with >=1 gigabit advertised speeds disabled, so it has a chance to link at 100Mbps without manual configuration. My basic understanding is that it should be sufficient to support this on one end only, so it only doesn't work when both ends don't support it. CSS610 + L41G + 2-pair only PoE injector happens to be a common combination for us when upgrading existing radio installations (multiple separate radios like SXTsq Lite5 or LHG5, with their 2-pair PoE injectors) to a common 60GHz radio shared (out of necessity, due to the unforuntate 8-stations-per-AP limit) between a few customers with a CSS610.
I'm seeing mixed results between different combinations of MT devices, for example:
- CRS328-24P-4S+ to wAP 60G AP - working (takes a few seconds longer than usual, but finally link is negotiated and up at 100Mbps-Full)
- CSS610-1Gi-7R-2S+OUT to L41G-2axD - NOT working (no link even after a long wait, link works only after setting to forced 100Mbps-Half)
Would it be possible for MT to handle this case properly in ALL devices with gigabit ethernet ports, or are some of them limited by hardware (switch chip features) that make this difficult? Basically, if there is no link for a long time, periodically retry auto-negotiation with >=1 gigabit advertised speeds disabled, so it has a chance to link at 100Mbps without manual configuration. My basic understanding is that it should be sufficient to support this on one end only, so it only doesn't work when both ends don't support it. CSS610 + L41G + 2-pair only PoE injector happens to be a common combination for us when upgrading existing radio installations (multiple separate radios like SXTsq Lite5 or LHG5, with their 2-pair PoE injectors) to a common 60GHz radio shared (out of necessity, due to the unforuntate 8-stations-per-AP limit) between a few customers with a CSS610.
Statistics: Posted by marekm — Tue Apr 02, 2024 8:03 pm