3Com Router 3012 - Page 58

58 CHAPTER A: OPTIONAL CABLE SPECIFICATIONS
Figure 33 V.35 DCE Cable Assembly
Table 34 describes V.35 DCE cable pinouts.
X.21 DTE Cable Pinouts Figure 34 illustrates the X.21 DTE cable.
Tabl e 34 V.35 DCE cable Pinouts
DB-50 Signal
Signal
Direction
34PIN Signal
31 CTS/RTS <— C RTS
2 RTS/CTS —> D CTS
26 DTR/DSR —> E DSR
1 LL/DCD —> F RLSD
6 DSR/DTR <— H DTR
30 DCD/LL <— K LT
20 RxD/TxD+ <— P SD+
44 RxD/TxD- <— S SD-
15 TxD/RxD+ —> R RD+
39 TxD/RxD- —> T RD-
19 RxC/TxCE+ <— U SCTE+
43 RxC/TxCE- <— W SCTE-
17 NIL/RxC+ —> V SCR+
41 NIL/RxC- —> X SCR-
16 TxCE/TxC+ —> Y SCT+
40 TxCE/TxC- —> AA SCT-
50 GND - A Shield_GND
7 GND - B Circuit_GND
24 RxD-REST GND - -
49 RxC-REST GND - -
25 TxC-REST GND - -
Enlarged A side
DB50 Male
V.35 Female
Label
Enlarged B side