
CX900e Hardware Reference Manual
5-12
3006M100-002
kind of device to the other, as illustrated below.
5.3.4
V.35H Serial I/O Card Signal Handling
Signaling through the V.35H Serial I/O Card’s port complies fully with the ITU-
T’s (CCITT) V.35 standard. Signaling, however, occurs through a DB-25
connector rather than an M-34 block connector.
Figure 5-9 V.35H DTE/DCE Configuration Jumpe
Table 5-3 Signal Pin-Outs for V.35H Port
V.35H
Signal
Circuit Function
ITU-T
DB-25
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
RXDA
Received Data (Set A)
104-A
3
In
Out
RTS
Request to Send
105
4
Out
In
CTS
Clear to Send
106
5
In
Out
DSR
Data Set Ready
107
6
In
Out
S. GND
Signal Ground
102
7
n/a
n/a
DCD
Data Carrier Detect
109
8
In
Out
RXCB
Receiver Clock (Set B)
115
9
In
Out
*Unassigned
10
n/a
n/a
ETXCB
External Transmitter Clock (Set B
113-B
11
Out
In
TXCB
Transmitter Clock (Set B)
114-B
12
In
Out
*Unassigned
13
not used
not used
TXDB
Transmitted Data (Set B)
103-B
14
Out
In
TXCA
Transmitter Clock (Set A)
114-A
15
In
Out
RXDB
Received Data (Set B)
104-B
16
In
Out
RXCA
Receiver Clock (Set A)
115-A
17
In
Out
*Unassigned
18
not used
not used
Summary of Contents for CX900e
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