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The PPP framing :rfc:`1662` was inspired by the datalink layer protocols standardized by ITU-T and ISO. A typical PPP frame is composed of the fields shown in the figure below. A PPP frame starts with a one byte flag containing `01111110`. PPP can use bit stuffing or character stuffing depending on the environment where the protocol is used. The address and control fields are present for backward compatibility reasons. The 16 bit Protocol field contains the identifier [#fpppid]_ of the network layer protocol that is carried in the PPP frame. `0x002d` is used for an IPv4 packet compressed with :rfc:`1144` while `0x002f` is used for an uncompressed IPv4 packet. `0xc021` is used by the Link Control Protocol, `0xc023` is used by the Password Authentication Protocol (PAP). `0x0057` is used for IPv6 packets. PPP supports variable length packets, but LCP can negotiate a maximum packet length. The PPP frame ends with a Frame Check Sequence. The default is a 16 bits CRC, but some implementations can negotiate a 32 bits CRC. The frame ends with the `01111110` flag.
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| Shortcut | Action |
|---|---|
| ? | Open available keyboard shortcuts. |
| Alt + Home | Navigate to the first translation in the current search. |
| Alt + End | Navigate to the last translation in the current search. |
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Alt + PageUp or
Ctrl + ↑ or Alt + ↑ or Cmd + ↑ or |
Navigate to the previous translation in the current search. |
|
Alt + PageDown or
Ctrl + ↓ or Alt + ↓ or Cmd + ↓ or |
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Ctrl + Enter or
Cmd + Enter |
Submit current form; this works the same as pressing Save and continue while editing translation. |
|
Ctrl + Shift + Enter or
Cmd + Shift +Enter |
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|
Alt + Enter or
Option + Enter |
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Ctrl + E or
Cmd + E |
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Ctrl + U or
Cmd + U |
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Ctrl + M or
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Shows Automatic suggestions tab. |
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Ctrl + 1 to
Ctrl + 9 or
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Copies placeable of a given number from source string. |
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Ctrl + M followed by
1 to 9 or
Cmd + M followed by 1 to 9 |
Copy the machine translation of a given number to current translation. |
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Ctrl + I followed by
1 to
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Copy the source string. |
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Ctrl + Y or
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Toggle the Needs editing checkbox. |
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| ← | Browse the previous translation string. |
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