
CX900e Hardware Reference Manual
4-4
3006M100-002
4.3
Signal Handling for Seventh Port Option
Signaling through the optional seventh port complies fully with the ITU-T’s
(CCITT) V.24 and IEEE’s EIA-232D standards for a DB-25 connector.
* These pins are not used in the present V.24 interface.
Table 4-1 Seventh Port Pin-Outs
V.24
Signal
Circuit
Function
EIA
CCITT
DB-25
Pin No.
Signal Direction
DTE
Signal Direction
DCE
PG
Protective Ground (Shield)
AA
101
1
not applicable
not applicable
TXD
Transmitted Data
BA
103
2
Out
In
RXD
Received Data
BB
104
3
In
Out
RTS
Request to Send
CA
105
4
Out
In
CTS
Clear to Send
CB
106
5
In
Out
DSR
Data Set Ready
CC
107
6
In
Out
SG
Signal Ground
AB
102
7
not applicable
not applicable
DCD
Data Carrier Detect
CF
109
8
In
Out
*Reserved
9
not used
not used
*Reserved
10
not used
not used
*Unassigned
11
not used
not used
*SCD
Secondary Received Line
Signal Detector
SCF 123
12
not used
not used
*SCTS Secondary Clear To Send
SCB 121
13
not used
not used
*STD
Secondary Transmitted Data SBA 118
14
not used
not used
TXC
Transmit Timing
DB
114
15
In
Out
*SRD
Secondary Received Data
SBB 119
16
not used
not used
RXC
Receive Timing
DD
115
17
In
Out
LL
Local Loopback
LL
141
18
Out
In
*SRTS Secondary Request To Send
SCA 120
19
not used
not used
DTR
Data Terminal
Ready (DTE Ready)
CD
108.2
20
Out
In
RL
Remote Loopback/
Signal Quality Detector
CG
110
21
Out
In
RI
Ring Indicator
RL
140
22
In
Out
DRS
Data Rate Selector
CH
111
23
Out
In
ETXC
Terminal Timing
DA
113
24
Out
In
TM
Test Mode
TM
142
25
In
Out
Содержание CX900e
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