Line	Name	EIA	CCITT	DTE-DCE		    Description
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 1	  FG	 AA	 101	  ----		Frame ground
 2	  TD	 BA	 103	  --->		Transmitted data
 3	  RD	 BB	 104	  <---		Received data
 4	 RTS	 CA	 105	  --->		Request to send
 5	 CTS	 CB	 106	  <---		Clear to send
 6	 DSR	 CC	 107	  <---		Data set ready
 7	  SG	 AB	 102	  ----		Signal ground
 8	 DCD	 CF	 109	  <---		Data carrier detect
 9	   -	 -	  -	    -		Positive DC test voltage
10	   -	 -	  -	    -		Negative DC test voltage
11	  QM	 -	  -	  <---		Equalizer mode
12	SDCD	SCF	 122	  <---		Secondary data carrier detect
13	SCTS	SCB	 121	  <---		Secondary clear to send
14	 STD	SBA	 118	  --->		Secondary transmitted data
15	  TC	 DB	 114	  <---		Transmitter clock
16	 SRD	SBB	 119	  <---		Secondary receiver clock
17	  RC	 DD	 115	  --->		Receiver clock
18	 DCR	 -	  -	  <---		Divided clock receiver
19	SRTS	SCA	 120	  --->		Secondary request to send
20	 DTR	 CD	 108.2	  --->		Data terminal ready
21	  SQ	 CG	 110	  <---		Signal quality
22	  RI	 CE	 125	  <---		Ring indicator
23	  -	 CH	 111	  --->		Data rate selector
	  -	 CI	 112	  <---		Data rate selector
24	  TC	 DA	 113	  <---		Transmitted clock
25	  -	 -	  -	    -		Busy signal to delay transfer
