chóngqǐ guāngmāo yǐhòu kàn zhǐshìdēng.

光猫 is a common everyday Chinese term for an optical modem or fiber modem.

It looks funny if you translate it literally:

• 光 = light
• 猫 = cat

But 猫 here does not really mean the animal. It comes from the sound of modem in older Chinese usage. Chinese speakers often say 猫 as a shorthand in words related to modems, especially in informal or technical everyday speech. So 光猫 is basically fiber/optical modem.

重启 is a shorter, very common way to say restart / reboot.

Compare:

• 重启 = restart, reboot
• 重新启动 = restart again / start up again

In many tech instructions, 重启 is preferred because it is shorter and natural. In this sentence, 重启光猫 means restart the modem.

The character 重 has more than one pronunciation. Here it is chóng, which often means again or re-.

So:

• 重启 = chóngqǐ = restart
• not zhòngqǐ

This is a common thing in Chinese: one character can have different readings depending on the word.

Here 以后 means after.

The pattern is:

[action/event] + 以后 + [main action]

So in this sentence:

• 重启光猫以后
• = after restarting the optical modem

Then the next action happens:

• 看指示灯
• = check/look at the indicator lights

So 以后 is marking that the second action happens after the first one.

No. 以后 can mean either:

1. after a specific action or time
2. later / in the future

In this sentence, it clearly means after because it follows an action:

• 重启光猫以后 = after restarting the modem

Examples:

• 吃饭以后休息。 = Rest after eating.
• 以后再说。 = We can talk about it later.

So the meaning depends on context and sentence structure.

Chinese often puts the earlier action or time condition first, then the main action.

So the structure is:

• 重启光猫以后 = after restarting the modem
• 看指示灯 = check the indicator lights

This is very natural in Chinese. It is similar to saying:

• After doing X, do Y

Chinese commonly organizes instructions this way.

Yes. The subject is omitted because it is understood from context.

In instructions, Chinese often leaves out you:

• 重启光猫以后看指示灯。
• literally: After restarting the modem, look at the indicator lights.

A fuller version could be:

• 你重启光猫以后看指示灯。

But that sounds less natural for a brief instruction. Chinese often drops subjects when they are obvious.

Here 看 means more than just physically look at. In context, it means check, look at, or observe.

So 看指示灯 means:

• look at the indicator lights
• check the status lights
• observe what the lights are doing

This is very common in Chinese: 看 often means check/examine depending on context.

Examples:

• 看天气 = check the weather
• 看一下手机 = check the phone
• 看医生 = see a doctor

指示灯 means indicator light or status light.

Breakdown:

• 指示 = indicate, signal
• 灯 = lamp, light

So 指示灯 refers to the little lights on a device that show status, power, internet connection, etc.

It could be added, but it is not necessary.

• 看指示灯 = check the indicator lights
• 看一下指示灯 = take a look at the indicator lights

Adding 一下 often makes the tone softer or a bit more casual/polite. But in instructions, short forms are very common, so 看指示灯 sounds natural and efficient.

Yes. That is very natural too.

• 后 and 以后 can both mean after
• 重启光猫后看指示灯
• 重启光猫以后看指示灯

Both work. In many cases, 后 is a bit shorter and more concise, while 以后 can sound slightly fuller. In practical instructions, both are common.

Because this is an instruction, not a completed-event statement.

了 often marks completion or a new situation. But here the speaker is telling someone what to do:

• first restart the modem
• then check the lights

So the sentence is giving a procedure, not reporting that the procedure has already happened. That is why no 了 is needed.

Yes, effectively it is.

Chinese instructions often use a bare verb phrase without an explicit command word:

• 看指示灯 = check the indicator lights

Even without words like 请, it can still function as an instruction or command. In technical directions, this plain style is very common.

Normally, 以后 should come after the whole first action phrase, not just after the verb.

So this is natural:

• 重启光猫以后看指示灯。

But this would sound wrong or incomplete:

• 重启以后光猫看指示灯。

That changes the structure and makes it unclear. The thing that happens first is restarting the modem, so that whole action should stay together before 以后.

It sounds like a practical technical instruction. It is short, direct, and natural in manuals, customer support messages, or troubleshooting steps.

It is not especially formal or especially casual. It is just efficient and instruction-like:

• do this first
• then check that

That compact style is very common in Chinese tech support language.