eki no kafe de muryou no waifai ni setuzoku dekita node, sono ba de fairu wo sousinsita.

They are doing two separate jobs:

• 駅のカフェ = the café at the station / the station’s café
  Here, の links 駅 and カフェ.

• 無料のワイファイ = free Wi-Fi
  Here, の links 無料 and ワイファイ.

A useful way to think about の is that it connects one noun-like element to another. In English, it often becomes things like:

• of
• ’s
• an attributive phrase like station café or free Wi-Fi

So this sentence has two different noun-linking phrases built with の.

で marks the place where an action or event happens.

So:

• 駅のカフェで = at the café in the station
• It tells you where the connection happened.

Here, the action is 接続できた, meaning was able to connect. The café is the location where that happened.

Compare:

• カフェで勉強する = study at a café
• 公園で食べる = eat in the park

In this sentence, で is not marking destination. It is marking the location of the action.

Because 接続する often uses に for the thing you connect to.

• ワイファイに接続する = connect to Wi-Fi
• ネットワークに接続する = connect to a network

So:

• 無料のワイファイに接続できた = I was able to connect to the free Wi-Fi

In English we say connect to, and Japanese often uses に in that same role.

You may also sometimes see と接続する in other contexts, especially when two devices or systems are being linked together, but に is very natural here.

接続できた is the past form of the potential expression of 接続する.

Breakdown:

• 接続する = to connect
• 接続できる = can connect / be able to connect
• 接続できた = could connect / was able to connect

So it does not just mean connect. It means successfully managed to connect.

In this sentence, it suggests that the speaker tried or needed to connect, and it worked.

Both ので and から can mean because or so, but the nuance is a little different.

• ので sounds a bit softer, more explanatory, and often more neutral.
• から can sound more direct or more like the speaker’s personal reasoning.

So:

• 接続できたので、その場でファイルを送信した。
  = Because I was able to connect, I sent the file right there.

This sounds like a calm explanation of what happened.

If you used から, it would still be grammatical, but ので fits very naturally in this kind of narrative sentence.

Yes, literally it is:

• その = that
• 場 = place / spot / scene
• で = at / in

So その場で literally means at that place.

But very often it has the natural meaning:

• on the spot
• right there
• immediately then and there

In this sentence:

• その場でファイルを送信した = I sent the file right there / on the spot

It emphasizes that the speaker sent the file immediately at the café, instead of waiting until later.

It is the same basic で as before: it marks the place where the action happens.

So in:

• その場でファイルを送信した

the sending happened at that spot.

Japanese often repeats particles like this when there are multiple location phrases in a sentence, each tied to its own part of the meaning:

• 駅のカフェで = at the station café
• その場で = right there / on the spot

The first sets the overall location. The second adds the nuance that the file was sent immediately at that same place.

Because ファイル is the direct object of 送信した.

• 送信する = to transmit / send
• ファイルを送信する = to send a file

So を marks the thing being sent.

This is the same pattern as:

• メールを送る = send an email
• 写真をアップロードする = upload a photo

In this sentence, the file is what receives the action of sending, so it takes を.

Both can mean sent, but the nuance is different.

• 送った is the ordinary, broad verb to send
• 送信した is more specific and technical, often used for digital or electronic sending

So:

• ファイルを送信した sounds very natural for sending a file over the internet
• ファイルを送った is also understandable, but less technical and less precise

Because the sentence talks about connecting to Wi-Fi, 送信した fits the tech context well.

Not necessarily. の does not only show ownership.

In 駅のカフェ, it more naturally means:

• the café at the station
• the station café
• a café in the station area, depending on context

So の can express many relationships, such as:

• possession: 私の本 = my book
• location/association: 駅のカフェ = the café at the station
• category/type: 日本の会社 = a Japanese company / a company in Japan

Here, ownership is not the main idea. It is more about association with the station.

Because they are loanwords, mainly from English or other foreign languages, and Japanese usually writes those in katakana.

• カフェ = café
• ワイファイ = Wi-Fi
• ファイル = file

Katakana is commonly used for:

• foreign loanwords
• foreign names
• technical terms
• emphasis sometimes

So seeing katakana here is completely normal, especially in a modern, technology-related sentence.

Yes, very much so.

できた shows successful ability in the past:

• not just I had the ability to connect
• but I was able to connect / I managed to connect

So the sentence implies a successful connection, which then led to the next action:

1. the speaker connected to the free Wi-Fi
2. therefore, they sent the file right there

That cause-and-effect flow is exactly what ので is linking together.

Yes. 無料のワイファイ is very natural, but you might also see:

• 無料Wi-Fi
• フリーWi-Fi

These are common in signs, ads, and everyday writing.

Nuance:

• 無料のワイファイ feels like a normal grammatical phrase in a full sentence
• 無料Wi-Fi is compact and common in announcements or labels
• フリーWi-Fi is also widely used, especially in public places

In this sentence, 無料のワイファイ works nicely because it fits the full sentence structure smoothly.