Re: [PATCH net-next 1/3] ethtool: Add 100base-FX link mode entries

Dan Murphy
2020-09-15T23:27:27Z

Andrew

On 9/15/20 3:10 PM, Andrew Lunn wrote:
> On Tue, Sep 15, 2020 at 01:17:06PM -0500, Dan Murphy wrote:
>> @@ -160,6 +160,8 @@ static const struct phy_setting settings[] = {
>> PHY_SETTING( 100, FULL, 100baseT_Full ),
>> PHY_SETTING( 100, FULL, 100baseT1_Full ),
>> PHY_SETTING( 100, HALF, 100baseT_Half ),
>> + PHY_SETTING( 100, HALF, 100baseFX_Half ),
>> + PHY_SETTING( 100, FULL, 100baseFX_Full ),
> Hi Dan
>
> Does 100baseFX_Half make an sense? My understanding of 802.3 section
> 26 is that it is always a pair, not a single fibre where you might
> need CSMA/CD?

I actually questioned that too and looked it up

I found these and thought they could be viable

http://www.certiology.com/tech-terms/network/100base-fx.html

"The 100Base-FX can be used in a maximum length of 412 meters if being
used in

half-duplex connections or as 2 kilometer lengths in the case of
full-duplex transmissions over optical fiber."

https://www.cnet.com/products/half-duplex-100basefx-interface-pb7/

Of course I never have seen one myself

Dan

> Andrew