ADTRAN SHDSL NxNTU Pin Connections, Circuit Number Circuit Name To/From DCE Pinout A/B

The local management port is a DB-9 female connector and is labeled V.28. The interchange circuits and pinouts are listed in Table 5. The local management baud rate will auto-detect between 2400 baud and 57600 baud.

See EIA-574, Sec 2.2 and Figure 2.7, with Receive Data, Transmit Data and Signal Ground only. The other pins are internally connected to ensure correct handshaking interoperability. These internal connections shall be made via resistor traces to facilitate with future build options.

Table 6 defines the X.21 port pin connections.

Table 5. V.28 Pin Connections

Interchange Name	Description	Pinout
DCD	Data Carrier Detect - Internally connected to DTR	1
	and DSR
RXD	Receive Data	2
TXD	Transmit Data	3
DTR	Data Terminal Ready - Internally connected to	4
	DCD and DSR
GND	Signal Ground	5
DSR	Data Set Ready - Internally connected to DCD	6
	and DTR
RTS	Ready To Send - Internally connected to CTS	7
CTS	Clear To Send - Internally connected to RTS	8
NC	No Connection	9

Table 6. X.21 Pin Connections

Circuit Number	Circuit Name	To/From DCE	Pinout (A/B)
G	Signal Ground		8
Ga	DTE Common Return		15
T	Transmit	FROM	2/9
R	Receive	TO	4/11
C	Control	FROM	3/10
I	Indication	FROM	5/12
S	Signal Element Timing		6/13
X	DTE Signal Element Timing	TO	7/14
	Shield Ground Option		1

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