doc: Import the official specification documents for E1
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/doc/T-REC-G.702-198811.pdf b/doc/T-REC-G.702-198811.pdf
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diff --git a/doc/T-REC-G.703-201604.pdf b/doc/T-REC-G.703-201604.pdf
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diff --git a/doc/T-REC-G.704-199810.pdf b/doc/T-REC-G.704-199810.pdf
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diff --git a/doc/T-REC-G.705-200010.pdf b/doc/T-REC-G.705-200010.pdf
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diff --git a/doc/T-REC-G.706-199104.pdf b/doc/T-REC-G.706-199104.pdf
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