TL-SG108E Setting to Half Duplex mode

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TL-SG108E Setting to Half Duplex mode

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TL-SG108E Setting to Half Duplex mode
TL-SG108E Setting to Half Duplex mode
2024-01-09 06:45:39 - last edited 2024-01-10 07:02:38
Model: TL-SG108E  
Hardware Version: V6
Firmware Version: 1.0.0 Build 20230218 Rel.50633

Hi,

I have TL-SG108E for my local network at home. In the Switch settings, I set the ports 1 and 2 to 1000MF connected to my PCs and it works fine in Gigabit mode. I have an IOT device which supports only 100M mode. If I set the port to 100MF, it is auto negotiating to 100M Half Duplex mode instead of 100M Full Duplex mode.

 

This is in 100MF setting:

 

$ ethtool eth0
Settings for eth0:
    Supported ports: [ TP     MII ]
    Supported link modes:   10baseT/Half 10baseT/Full
                            100baseT/Half 100baseT/Full
    Supported pause frame use: Symmetric Receive-only
    Supports auto-negotiation: Yes
    Supported FEC modes: Not reported
    Advertised link modes:  10baseT/Half 10baseT/Full
                            100baseT/Half 100baseT/Full
    Advertised pause frame use: Symmetric Receive-only
    Advertised auto-negotiation: Yes
    Advertised FEC modes: Not reported
    Link partner advertised link modes:  100baseT/Half
    Link partner advertised pause frame use: No
    Link partner advertised auto-negotiation: No
    Link partner advertised FEC modes: Not reported
    Speed: 100Mb/s
    Duplex: Half
    Auto-negotiation: on
    Port: Twisted Pair
    PHYAD: 8
    Transceiver: internal
    MDI-X: Unknown
netlink error: Operation not permitted
        Current message level: 0x0000003f (63)
                               drv probe link timer ifdown ifup

======

As you can see, it is in Half Duplex mode. My internet speed is also getting capped to 30 Mbps instead of 100Mbps

 

Link partner advertised link modes is 100baseT/Half

 

 

Now, When I set the Speed/Duplex to "Auto" in the switch settings, it is auto negotiating to 100M Full Duplex mode.

 

See the ethtool output now:

 

$ ethtool eth0
Settings for eth0:
    Supported ports: [ TP     MII ]
    Supported link modes:   10baseT/Half 10baseT/Full
                            100baseT/Half 100baseT/Full
    Supported pause frame use: Symmetric Receive-only
    Supports auto-negotiation: Yes
    Supported FEC modes: Not reported
    Advertised link modes:  10baseT/Half 10baseT/Full
                            100baseT/Half 100baseT/Full
    Advertised pause frame use: Symmetric Receive-only
    Advertised auto-negotiation: Yes
    Advertised FEC modes: Not reported
    Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                         100baseT/Half 100baseT/Full
    Link partner advertised pause frame use: No
    Link partner advertised auto-negotiation: Yes
    Link partner advertised FEC modes: Not reported
    Speed: 100Mb/s
    Duplex: Full
    Auto-negotiation: on
    Port: Twisted Pair
    PHYAD: 8
    Transceiver: internal
    MDI-X: Unknown
netlink error: Operation not permitted
        Current message level: 0x0000003f (63)
                               drv probe link timer ifdown ifup
    Link detected: yes

 

 

I tried using different ethernet cable and no change. So, should I use "Auto" mode for this? I am trying to set the ports to 100MF but the OS detects as 100MH. Please advise.

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1 Accepted Solution
Re:TL-SG108E Setting to Half Duplex mode-Solution
2024-01-10 01:58:41 - last edited 2024-01-10 07:02:38

Hi @Techzy 
Thanks for posting in our business forum.

So set it to Auto to get a full duplex from it. It does not really matter in this situation when you can leave it to Auto.

Tweaking it might only cause trouble since your IoT seems to be not accepting the forced link speed.

Leave it be and no need to manually set it.

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Re:TL-SG108E Setting to Half Duplex mode-Solution
2024-01-10 01:58:41 - last edited 2024-01-10 07:02:38

Hi @Techzy 
Thanks for posting in our business forum.

So set it to Auto to get a full duplex from it. It does not really matter in this situation when you can leave it to Auto.

Tweaking it might only cause trouble since your IoT seems to be not accepting the forced link speed.

Leave it be and no need to manually set it.

Best Regards! If you are new to the forum, please read: Howto - A Guide to Use Forum Effectively. Read Before You Post. Look for a model? Search your model NOW Official and Beta firmware. NEW features! Subscribe for the latest update!Download Beta Here☚ ☛ ★ Configuration Guide ★ ☚ ☛ ★ Knowledge Base ★ ☚ ☛ ★ Troubleshooting ★ ☚ ● Be kind and nice. ● Stay on the topic. ● Post details. ● Search first. ● Please don't take it for granted. ● No email confidentiality should be violated. ● S/N, MAC, and your true public IP should be mosaiced.
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Re:TL-SG108E Setting to Half Duplex mode
2024-01-10 06:13:12 - last edited 2024-01-10 06:15:07

Hi @Clive_A  Okay, thank you. I will use the Auto mode from now on.

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