
CX900e Hardware Reference Manual
5-16
3006M100-002
5.4.4
X.21 Serial I/O Card Signal Handling
The following table identifies the X.21 signals supported on the I/O port
connector. The information identifies the pin through which the signal passes on
the DB-15 port connector.
5.4.5
X.21 Serial I/O Card Power Consumption
Power consumption for the X.21 Serial I/O card is 1.5 Watts (5.15 BTU/hr).
Figure 5-12 X.21 DTE/DCE Configuration Jumper
Table 5-4 Signal Pin-Outs for X.21 Port
X.21
Signal
Circuit Function
ITU-T
DB-15
Pin No.
Signal
DTE
Direction
DCE
F. GND
Protective Ground
101
1
n/a
n/a
TXDA
Transmitted Data (Set A)
103-A
2
Out
In
DTRA
Data Terminal Ready (Set A)
108-A
3
Out
In
RXDA
Received Data (Set A)
104-A
4
In
Out
DCDA
Data Carrier Detect (Set A)
109-A
5
In
Out
RXCA
Receive Clock (Set A)
115-A
6
In
Out
DTE Signal Element Timing (Set A)
7
not used
not used
S. GND
Signal Ground
102
8
n/a
n/a
TXDB
Transmitted Data (Set B)
103-B
9
Out
In
DTRB
Data Terminal Ready (Set B)
108-B
10
Out
In
RXDB
Received Data (Set B)
104-B
11
In
Out
DCDB
Data Carrier Detect (Set B)
109-B
12
In
Out
RXCB
Receiver Clock (Set B)
115-B
13
In
Out
DTE Signal Element Timing (Set B)
14
not used
not used
Reserved
15
not used
not used
Summary of Contents for CX900e
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