diff --git a/plutosdr-revb-extclk/plutosdr-revb-extclk.sch.pdf b/plutosdr-revb-extclk/plutosdr-revb-extclk.sch.pdf
new file mode 100644
index 0000000..f77e308
Binary files /dev/null and b/plutosdr-revb-extclk/plutosdr-revb-extclk.sch.pdf differ
diff --git a/x21-jumper/x21_jumper.brd b/x21-jumper/x21_jumper.brd
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--- /dev/null
+++ b/x21-jumper/x21_jumper.brd
@@ -0,0 +1,884 @@
+
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+SHLD
+T(B)
+T(A)
+C(B)
+C(A)
+R(B)
+R(A)
+I(B)
+I(A)
+S(B)
+S(A)
+B(B)
+B(A)
+GND
+SHLD
+T(B)
+T(A)
+C(B)
+C(A)
+R(B)
+R(A)
+I(B)
+I(A)
+S(B)
+S(A)
+B(B)
+B(A)
+GND
+SHLD
+T(B)
+T(A)
+C(B)
+C(A)
+R(B)
+R(A)
+I(B)
+I(A)
+S(B)
+S(A)
+B(B)
+B(A)
+GND
+SHLD
+T(B)
+T(A)
+C(B)
+C(A)
+R(B)
+R(A)
+I(B)
+I(A)
+S(B)
+S(A)
+B(B)
+B(A)
+GND
+X.21 JUMPER BOX
+by Harald Welte
+X.21 JUMPER BOX
+FEMALE
+MALE
+
+
+
+<b>Pin Header Connectors</b><p>
+<author>Created by librarian@cadsoft.de</author>
+
+
+<b>PIN HEADER</b>
+
+
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+
+
+>NAME
+>VALUE
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<BR>Würth Elektronik -- Electronic Interconnect & Electromechanical Solutions<br><Hr>
+<BR><BR>
+<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0>
+<TR>
+<TD BGCOLOR="#cccccc" ALIGN=CENTER><FONT FACE=ARIAL SIZE=3><BR><br>
+ <BR>
+ <BR>
+ <BR>
+ <BR><BR></FONT>
+ </TD>
+<TD BGCOLOR="#cccccc" ALIGN=CENTER><FONT FACE=ARIAL SIZE=3><br>
+ -----<BR>
+ -----<BR>
+ -----<BR>
+ -----<BR>
+ -----<BR><BR></FONT>
+ </TD>
+ <TD BGCOLOR="#cccccc" ALIGN=CENTER> <FONT FACE=ARIAL SIZE=3><br>
+ ---------------------------<BR>
+<B><I><span style='font-size:26pt;
+ color:#FF6600;'>WE </span></i></b>
+<BR>
+ ---------------------------<BR><b>Würth Elektronik</b></FONT>
+ </TD>
+ <TD BGCOLOR="#cccccc" ALIGN=CENTER><FONT FACE=ARIAL SIZE=3><br>
+ ---------O---<BR>
+ ----O--------<BR>
+ ---------O---<BR>
+ ----O--------<BR>
+ ---------O---<BR><BR></FONT>
+ </TD>
+
+<TD BGCOLOR="#cccccc" ALIGN=CENTER><FONT FACE=ARIAL SIZE=3><BR>
+ <BR>
+ <BR>
+ <BR>
+ <BR>
+ <BR><BR></FONT>
+ </TD>
+ </TR>
+
+ <TR>
+ <TD COLSPAN=7>
+ </TD>
+ </TR>
+
+</TABLE>
+<B> More than you expect<BR><BR><BR></B>
+
+<HR><BR>
+<b>Würth Elektronik eiSos GmbH & Co. KG</b><br>
+EMC & Inductive Solutions<br>
+
+Max-Eyth-Str.1<br>
+D-74638 Waldenburg<br>
+<br>
+Tel: +49 (0)7942-945-0<br>
+Fax:+49 (0)7942-945-405<br>
+<br>
+<a href="http://www.we-online.com/eagle">http://www.we-online.com/eagle</a><br>
+<a href="mailto:libraries@we-online.com">libraries@we-online.com</a> <BR><BR>
+<br><HR><BR>
+Neither CadSoft nor WE-eiSos does warrant that this library is error-free or <br>
+that it meets your specific requirements.<br><BR>
+Please contact us for more information.<br><BR><br>
+<hr>
+Version 6, January 13th 2015
+<HR>
+Copyright: Würth Elektronik
+
+
+WR-DSUB 8.08mm Female Angled PCB Connector with Hex Screw, 15 Pins
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+>NAME
+>VALUE
+1
+15
+
+
+WR-DSUB 8.08mm Male Angled PCB Connector with Hex Screw, 15 Pins
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+>NAME
+>VALUE
+1
+15
+
+
+
+
+
+
+
+
+
+
+
+
+
+<b>Aisler Design Rules - 2 Layers - simple</b>
+
+<p>
+Please note that the design rules provided here constitute the limit of our manufacturing capabilities. Especially in combination with the autorouter, boards are not guaranteed to be functional. So if possible, try not to exploit the drc minimum.
+
+Everything else you will find on https://aisler.net/help
+<b>Aisler Design Rules - 2 Layers - simple</b>
+
+<p>
+Please note that the design rules provided here constitute the limit of our manufacturing capabilities. Especially in combination with the autorouter, boards are not guaranteed to be functional. So if possible, try not to exploit the drc minimum.
+
+Everything else you will find on https://aisler.net/help
+
+
+
+
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+
+
+Since Version 6.2.2 text objects can contain more than one line,
+which will not be processed correctly with this version.
+
+
+
diff --git a/x21-jumper/x21_jumper.sch b/x21-jumper/x21_jumper.sch
new file mode 100644
index 0000000..b2f12e6
--- /dev/null
+++ b/x21-jumper/x21_jumper.sch
@@ -0,0 +1,1094 @@
+
+
+
+
+
+
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+
+
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+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<BR>Würth Elektronik -- Electronic Interconnect & Electromechanical Solutions<br><Hr>
+<BR><BR>
+<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0>
+<TR>
+<TD BGCOLOR="#cccccc" ALIGN=CENTER><FONT FACE=ARIAL SIZE=3><BR><br>
+ <BR>
+ <BR>
+ <BR>
+ <BR><BR></FONT>
+ </TD>
+<TD BGCOLOR="#cccccc" ALIGN=CENTER><FONT FACE=ARIAL SIZE=3><br>
+ -----<BR>
+ -----<BR>
+ -----<BR>
+ -----<BR>
+ -----<BR><BR></FONT>
+ </TD>
+ <TD BGCOLOR="#cccccc" ALIGN=CENTER> <FONT FACE=ARIAL SIZE=3><br>
+ ---------------------------<BR>
+<B><I><span style='font-size:26pt;
+ color:#FF6600;'>WE </span></i></b>
+<BR>
+ ---------------------------<BR><b>Würth Elektronik</b></FONT>
+ </TD>
+ <TD BGCOLOR="#cccccc" ALIGN=CENTER><FONT FACE=ARIAL SIZE=3><br>
+ ---------O---<BR>
+ ----O--------<BR>
+ ---------O---<BR>
+ ----O--------<BR>
+ ---------O---<BR><BR></FONT>
+ </TD>
+
+<TD BGCOLOR="#cccccc" ALIGN=CENTER><FONT FACE=ARIAL SIZE=3><BR>
+ <BR>
+ <BR>
+ <BR>
+ <BR>
+ <BR><BR></FONT>
+ </TD>
+ </TR>
+
+ <TR>
+ <TD COLSPAN=7>
+ </TD>
+ </TR>
+
+</TABLE>
+<B> More than you expect<BR><BR><BR></B>
+
+<HR><BR>
+<b>Würth Elektronik eiSos GmbH & Co. KG</b><br>
+EMC & Inductive Solutions<br>
+
+Max-Eyth-Str.1<br>
+D-74638 Waldenburg<br>
+<br>
+Tel: +49 (0)7942-945-0<br>
+Fax:+49 (0)7942-945-405<br>
+<br>
+<a href="http://www.we-online.com/eagle">http://www.we-online.com/eagle</a><br>
+<a href="mailto:libraries@we-online.com">libraries@we-online.com</a> <BR><BR>
+<br><HR><BR>
+Neither CadSoft nor WE-eiSos does warrant that this library is error-free or <br>
+that it meets your specific requirements.<br><BR>
+Please contact us for more information.<br><BR><br>
+<hr>
+Version 6, January 13th 2015
+<HR>
+Copyright: Würth Elektronik
+
+
+WR-DSUB 8.08mm Female Angled PCB Connector with Hex Screw, 15 Pins
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+>NAME
+>VALUE
+1
+15
+
+
+WR-DSUB 8.08mm Male Angled PCB Connector with Hex Screw, 15 Pins
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+>NAME
+>VALUE
+1
+15
+
+
+
+
+
+
+>NAME
+>VALUE
+
+
+
+
+
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+
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+
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+
+
+
+
+
+
+
+
+
+
+
+>NAME
+>VALUE
+
+
+
+
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+
+
+
+
+
+
+<b>WR-DSUB 8.08mm Female Angled PCB Connector with Hex Screw, 15 Pins</b>=>Code : Con_I-O_DSUB_PCB_Female_w-screw_618015231121
+<br><a href="http://katalog.we-online.de/media/images/eican/Con_I-O_DSUB_PCB_Female_w-screw_6180xx231121_pf2.jpg" title="Enlarge picture">
+<img src="http://katalog.we-online.de/media/thumbs2/eican/thb_Con_I-O_DSUB_PCB_Female_w-screw_6180xx231121_pf2.jpg" width="320"></a><p>
+Details see: <a href="http://katalog.we-online.de/en/em/618_0xx_231_121">http://katalog.we-online.de/en/em/618_0xx_231_121</a><p>
+Created 2014-07-10, Karrer Zheng<br>
+2014 (C) Würth Elektronik
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<b>WR-DSUB 8.08mm Male Angled PCB Connector with Hex Screw, 15 Pins</b>=>Code : Con_I-O_DSUB_PCB_Male_w-screw_618015231221
+<br><a href="http://katalog.we-online.de/media/images/eican/Con_I-O_DSUB_PCB_Male_w-screw_6180xx231221_pf2.jpg" title="Enlarge picture">
+<img src="http://katalog.we-online.de/media/thumbs2/eican/thb_Con_I-O_DSUB_PCB_Male_w-screw_6180xx231221_pf2.jpg" width="320"></a><p>
+Details see: <a href="http://katalog.we-online.de/en/em/618_0xx_231_221">http://katalog.we-online.de/en/em/618_0xx_231_221</a><p>
+Created 2014-07-10, Karrer Zheng<br>
+2014 (C) Würth Elektronik
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+
+
+
+
+
+
+
+
+
+<b>Frames for Sheet and Layout</b>
+
+
+
+
+
+
+
+
+
+
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+
+
+
+
+
+
+
+
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+
+
+
+
+Date:
+>LAST_DATE_TIME
+Sheet:
+>SHEET
+REV:
+TITLE:
+Document Number:
+>DRAWING_NAME
+
+
+
+
+<b>FRAME</b><p>
+DIN A4, landscape with extra doc field
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<b>Pin Header Connectors</b><p>
+<author>Created by librarian@cadsoft.de</author>
+
+
+<b>PIN HEADER</b>
+
+
+
+
+
+
+
+
+
+
+
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+
+
+
+
+
+
+
+>NAME
+>VALUE
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<b>PIN HEADER</b>
+
+
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+
+>NAME
+>VALUE
+
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+
+
+
+
+
+
+>NAME
+>VALUE
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<b>PIN HEADER</b>
+
+
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