Recently made a PHY chip exchange board, no software debugging, pure hardware hand lu,
PHY chip is gigabit so, at present only 4 MB network Internet line, the result is that when using correlates butt so instantly, meet gigabit so need more than ten seconds or more than 20 seconds to successfully negotiate,
Don't know the reason, and then found a gigabit switches to test, 4578 disconnect the network cable, only after 1236, switches gigabit so docking other gigabit so, since the negotiation is also very long time, can pick up MB so instant consultations, it seems to become common problems,
Does this agreement problem, is there any Ethernet aspects of the great god give off and confused

CodePudding user response:

4578 can't disconnect, at 100 m, the 4 lines is useless, but not hung up, otherwise to 1236 will have a lot of interference, when doing the experiment, the broken thread can meet 50 ohm resistor to ground,

CodePudding user response:

reference 1st floor qq_708907433 response:

4578 can't disconnect, at 100 m, the 4 lines is useless, but not hung up, otherwise to 1236 will have a lot of interference, when doing the experiment, the broken thread can meet 50 ohm resistor to ground,

PHY chip Datasheet indicate that if correlates with the nets, 4578 several interface must be suspended, so such a design, now it is not clear between gigabit front-end ports and gigabit so correlates with cable connection, what is the process of negotiation, why such a long time

CodePudding user response:

Best posted on the circuit and layout, this may be linked to the layout, in addition, phy is driven voltage or current driver? Gigabit correlates and network transformer tap joint of right,

CodePudding user response:

Problem solved a while ago, it was a work common problems:
If two gigabit so correlates with wiring, will first identify thousands of signs in the network, not later at speeds, reduced to MB network, it's waste of time,
Terms, a shopping mall and the mountains on the phone said I need one thousand tons of forest products, every day people said no problem, I this forest products enough to supply you one thousand tons a day, the results found during transportation, the road is too bad, can only transport 100 tons a day, and then make a phone call to discuss, don't go out ah, give you supply 100 tons a day,

CodePudding user response:

Check the shiftdown configuration