SG500-28p fiber uplink to non cisco switch

[j.van.drongelen]

I'm in process of replacing my switches (3Com Switch 5500G-EI 24-Port ) with cisco sg500-28 switches

I configured the switch to be in standalone mode, put in a SFPmodule in port 25 and connect it with fiber to an 3Com 5500G-EI

i see the lights flashing and blinking an thought i was done, but when i plugged in a device it didn't obtain an ipaddress and after manually put in an ipaddress i could go no further than the switch itself

i tried the other ports as well (26, 27 and 28) but to no avail

what do i do wrong, is it even possible to connect this switch via fiber to a switch which is from another brand?

[vivek srivastava]

can u share:

• config of the fiber ports for both 3com and cisco switches.
• "sh int x/x/x" of cisco switch (via cli)

[j.van.drongelen]

i don't have a comport with me now to enter the switch by cli, this is how it shows on the webpage

Interface:    
Port    
Port Type:    1000M-ComboF
Port Description:    
    (0/64 Characters Used)    

Administrative Status:    
    Up
    Down
Operational Status:    Up
Time Range:    
    Enable
Time Range Name:    
    Edit
Operational Time-Range State:    N/A
Reactivate Suspended Port:    

Auto Negotiation:    
    Enable
Operational Auto Negotiation:    Disable
Administrative Port Speed:    
    10M
    100M
    1000M
Operational Port Speed:    1000M
Administrative Duplex Mode:    
    Half
    Full
Operational Duplex Mode:    Full
Auto Advertisement:    
    Max Capability        10 Half
    10 Full        100 Half
    100 Full        1000 Full
Operational Advertisement:    
Unknown                
Neighbor Advertisement:    
1000 Full
Back Pressure:    
    Enable
Flow Control:    
    Enable
    Disable
    Auto-Negotiation

MDI/MDIX:    
    MDIX
    MDI
    Auto
Operational MDI/MDIX:    MDI

Protected Port:    
    Enable

i hooked the cisco up to another switch (3Com 16491) and they can talk to each other, looks like indeed a config error on the 3Com 5500 port

again, hooked it up to 3Com5500, flashing leds but no communication, portsettings on 3Com5500 EI

Port State            Enable[Active]
PVID                  1
Flow Control          Disable
Link Type             Access
MDI                   Auto
Speed                 1000[1000]
Duplex                Auto[Full]
Max MAC Count         No Limit
Jumbo Frame           Enabled
Port Isolate          Disabled
Broadcast Suppression 100%

what is worng? tried speed autonegotiation, was not working either