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Sync Serial port
62
SmartNode 4900 Series Getting Started Guide
C • Port pin-outs
Sync Serial port
Two types of serial ports are available: V.35 or X.21. They are configured as DTE. The V.35 is presented on a
DB-25 female connector (see
table 14
for pin-outs). The X.21 is presented on a DB-15 female connector (see
table 15
for pin-outs).
Note
Pins not listed are not used
Table 14. V.35 serial port signals (DB-25 connector)
Pin
Description
1
Frame Ground
2
TD-a (to DCE)
3
RD-a (from DCE)
4
RTS (to DCE)
5
CTS (from DCE)
6
DSR (from DCE)
7
Signal Ground
8
CD (from DCE)
9
RC-b (from DCE)
11
XTC-b (to DCE)
12
TC-b (from DCE)
14
TD-b (to DCE)
15
TC-a (from DCE)
16
RD-b (from DCE_
17
RC-a (from DCE)
20
DTR (to DCE)
24
XTC-a (to DCE)
Table 15. X.21 serial port signals (DB-15 connector)
Pin
Description
1
Signal Ground
8
DTE Common Return
2
Transmit (to DCE)
3
Control (to DCE)
4
Receive (from DCE)
5
Indication (from DCE)
6
Signal Element Timing (from DCE)
9
Transmit (to DCE)
10.
Control (to DCE)
11
Receive (from DCE)
12
Indication (from DCE)
13
Signal Element Timing (from DCE)
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