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X.21 Serial Port 79
SmartNode 4830 Getting Started Guide D • Port pin-outs
X.21 Serial Port
FXS port
The FXS ports use an RJ-11 connector with 6 positions. The middle two positions, 3 and 4, are used according
to table 18.
Note Pins not listed are not used.
FXO port
The FXO ports use an RJ-11 connector with 6 positions. The middle two positions, 3 and 4, are used accord-
ing to table 19.
Note Pins not listed are not used.
Table 17. X.21 Female DB-15 connector
X.21 Interface Pin-Out
Pin Signal
1 Signal Ground
2 TD-d
3 Control-a
4 RD-a
5 Indication-a
6 Signal Element Timing (Clock) -a
8 DTE Common Return
9 TD-b
10 Control-b
11 RD-b
12 Indication-b
13 Signal Element Timing (Clock)-b
Table 18. RJ-11 socket
Pin Signal
3 Ring (-)
4 Tip (+)
Table 19. RJ-11 socket
Pin Signal
3 Ring (-)
4 Tip (+)