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02-26-2018

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Why is my WLAN card slot narrower than my WWAN card slot (PCIe mini)?

2018-02-26, 6:31 AM

Hello All,

 

I'm looking under the hood of my 1st gen Thinkpad X1 Carbon, and I'm trying to identify the PCIe slots.  In particular, the following page states that I should have 2 PCI Express Mini slots:  https://support.lenovo.com/au/en/solutions/pd027202

 

Now I see the WLAN card and the WWAN card, and my natural assumption is that these are both in PCIe ports, but on closer inspection I see that the WLAN card's slot is only 19mm wide, whereas the WWAN card is the standard 26mm width of normal PCIe Mini ports.

 

This raises some questions:

  1. Is the WLAN connected to a proprietary slot, or is this just a different type of PCIe standard?

  2. If the WLAN is connected to a proprietary slot, where is my second PCIe slot?

 

Any help would greatly be appreciated.

 

Regards,

Adam Zebrowski

-az

 

 

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7 Posts

02-26-2018

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Re: Why is my WLAN card slot narrower than my WWAN card slot (PCIe mini)?

2018-02-26, 6:35 AM

On closer inspection, it looks like my SSD connects to a similar-looking slot as my WLAN card.  I guess this means my WLAN card uses a SATA connection or something?

 

I normally work with desktop PCs, so I'm unfamiliar with a lot of these laptop hardware standards.

 

Regards,

Adam Zebrowski

-az-

 

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Re: Why is my WLAN card slot narrower than my WWAN card slot (PCIe mini)?

2018-02-26, 7:15 AM

1st gen carbons use a non-standard, proprietary sized ssd that is only used on that model


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

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Re: Why is my WLAN card slot narrower than my WWAN card slot (PCIe mini)?

2018-02-26, 7:25 AM
Hi

x1c' gen1 slots are:
- wwan - PCIe mini
- wlan - SFF (Small Form Factor)
- SSD - SFF

SFF isn't the same formfactor as modern m.2 one. So, the cards for these slots are incompatible. WLAN slot lanes are routed to the PCIe bus, WWAN - to USB bus and partially to PCIe bus, SSD - to SATA controller..



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7 Posts

02-26-2018

AU

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Re: Why is my WLAN card slot narrower than my WWAN card slot (PCIe mini)?

2018-02-27, 20:46 PM

Thanks so much for the clear answer.

 

Regards,

Adam Zebrowski

-az

 

 

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