Fiber connection with converters

[asdrewaqf]

Hello Everyone, 

i've an issue with fiber connection let me explain it:-

i've a core SW 4507R+E on port G 1/41 it connected with an ethernet cable the connected to fiber converter okay.

and the other side from the fiber cable connected to a fiber converter as well in another floor building and the patch cord from the second converter connected to port 25 on a SW SG200-26FP 26-Port Gigabit PoE Smart Switch Version 1.4.0.88 

the issue is whenever we ping to the SW SG200 from the main floor for example there're alot of request times out.

when i delved into the issue and changed the core switch port G1/41 speed to 100 it works fine without any single packet loss.

would you help me to understand what may be the issue?
why when the port speed is 1000 it gives alot of request times out.

and would it affect the users on that floor since the speed on the core SW is only 100 not 1000? is it enough or appropriate.

[balaji.bandi]

Not sure what media converter here, do you have model which says support 1GB (most of local made are different)

Also on the switch side try no speed negotiation and test it.

show interface G1/41 (when you connect th media convert) will help. check other same same output and post here.

what kind media converter Multi Mode or single Mode ?

This nothing to do with Cisco device side this is more of do with in the middle device and Cat cables you using.

If you connect the Laptop on cisco device port G1/41 and other side port 25  both end are you able to get 1GB connect and able to ping ok ? (end device testing ?)

on SG switch only uplink ports are 1GB (is both both port using ?)  - rest all 100MB only.

https://www.cisco.com/c/en/us/products/collateral/switches/small-business-100-series-unmanaged-switches/data_sheet_c78-667827.html

[asdrewaqf]

1- Media Converter is "10/100/1000Base-TX to 1000Base-FX Gigabit Ethernet Converter AN-UMG-MM-AS-850"

2- do you have model which says support 1GB (most of local made are different) ?? --> i think that media converter supports 1G

3- when use it as speed 1000 --->> gives request times out
when use it as speed 100 --->> works fine without any request timesout
when use it speed auto only --- gives request times out
when use it speed auto 1000 --- gives request times out
when use it speed auto 100 --- gives request times out
when test with no speed ---> give request times out

4- port configuration attached here.

5- what kind media converter Multi Mode or single Mode ? --> i think its multi mode

6- end device testing ? idk how to test it while the port is trunk and no DHCP server to set IP for that laptop, i've only tested it by giving the laptop an IP in the same range for the SG 200 and it normally to ping without any packet loss

7- on SG switch i use only one port is port 25 with the media converter.

[Leo Laohoo]

Remove the switch and plug a laptop.  

Are there any ping dropouts to the laptop/computer?

[asdrewaqf]

do you mean to remove the SW SG 200 and replace it with laptop ?

[asdrewaqf]

i've replaced the cisco SG 200 with laptop and its the same only works without packet loss when i set port speed 100 for any other options it keeps giving a lot of requests timesout

[Leo Laohoo]

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@asdrewaqf wrote:

i've replaced the cisco SG 200 with laptop and its the same only works without packet loss when i set port speed 100 for any other options it keeps giving a lot of requests timesout

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Something is wrong with the fibre run (Layer 1 issue).  

Replace the media converters with GLC-SX-MMD and see if the issue is reoccurring.