
6 MULTI I/O CARD
3021M100-002
6-5
6.1.3
Signal LEDs
There are 3 LEDs for each port on the Multi I/O. The DCE LED glows red when
the port is configured as a DCE, the RXD LED blinks green when data is received
and the TXD LED blinks green when data is transmitted.
6.1.4
Multi I/O Signal Handling
Signaling through each V.24 port complies fully with ITU-T’s V.24 and EIA-
232D standards for each DB-25 on the Multi I/O cable.
6.1.5
Multi I/O Card Power Consumption
Power consumption is 3 Watts (10.3 BTU/hr).
Table 6-1 Signal Pin-Outs for Multi I/O V.24
V.24
Signal
Circuit Function
EIA
CCITT
DB-25
Pin No.
Signal
DTE
Direction-
DCE
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
n/a
n/a
DCD
Data Carrier Detect
CF
109
8
In
Out
TXC
Transmit Timing
DB
114
15
In
Out
*SRD
Secondary Receive Data
SBB
119
16
not used
not used
RXC
Receive Timing
DD
115
17
In
Out
DTR
Data Terminal Ready (DTE
Ready)
CD
108.2
20
Out
In
EXTC
Terminal Timing
DA
113
24
Out
In
Содержание CX900e
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